Table of Contents 1. Introduction ........1 The RA-5A Chassis 15. Troubleshooting The RA-3/3A Chassis the RA-5A Chassis .......67 2. The RA-3/3A Chassis ......2 Overview..............67 3. Power Supply Troubleshooting ..3 16. Power Supply Troubleshooting ...68 The Main Power Supply ........6 Overview..............
Chapter 1 - Introduction In the fall of 1996, Sony Electronics introduced a troubleshooting course (TVP-06) that covered troubleshooting of the AP and RA-1 chassis, along with the prior EX and EXR model sets. The course provided some useful and practical approaches to repairing failures that might occur in each of the circuits, and allowed the technician to focus on troubleshooting more than theory of operation.
1. Features Chapter 2 - The RA-3/3A Chassis Overview The RA-3 chassis introduced a major redesign in the convergence circuits that made it much easier for the technician to converge the set with greater accuracy and speed. It is know as Flash Focus and allowed the customer to perform more thorough convergence realignment should it drift out of range.
3. RA-3/3A Power Supply Troubleshooting Chapter 3 - RA-3/3A Power Supply Troubleshooting he Standby Power Supply The standby supply is a simple switched-mode type utilizing a single transistor, transformer and feedback circuitry to generate approximately 7VDC provided to a 5-volt regulator IC. Regulation will be provided by changing the oscillation frequency based on current demand.
3. RA-3/3A Power Supply Troubleshooting T602 FB621 R607 4.7 OHMS D601 C617 D602 R620 FROM TO RY601 T601/1 POWER RELAY D623 AC Hi SIDE IC655 R609 5V REG 7.2VDC BAO5T D667 CN605 C614 R616 STANDBY C616 C650 +5V TO Q601 D607 A BOARD 2SK2845...
3. RA-3/3A Power Supply Troubleshooting Once the FET has been changed along with R607, you will need to disconnect the secondary voltage line by lifting D667. This is very important since switch-mode supplies draw very small amounts of current while running unloaded and the load from the 5-volt line must be kept from drawing any current.
The Main Power Supply The main power supply is still a somewhat conventional style that has been used in Sony televisions for many years. It is only active when the unit is powered up by energizing the main relay RY601. It has earned a dubious reputation amongst technicians due to its insatiable appetite for several sets of switching transistors before the technician finally got it repaired, and, rightfully so.
3. RA-3/3A Power Supply Troubleshooting Once C620 has charged, the upper transistor will lose its large B-E current and turn off. The impedance of the primary in T604 will determine how fast C620 is charged and this will vary depending on the amount of current in the control winding at pin 7 and 8 of T604.
3. RA-3/3A Power Supply Troubleshooting Troubleshooting Once a few standard procedures are followed, this power supply is not too difficult to repair. The greatest obstacle is the precise timing required for the two transistors inside of IC601 to work together. They form a classical AB-type amplifier design.
3. RA-3/3A Power Supply Troubleshooting No AC Current Is Read: You have a supply that will not start. This is not common, but can occur. Bring the AC voltage up to 40 volts. It is recommended to not exceed this level just in case you accidentally cause the oscillator to start while probing around with the scope and meter.
3. RA-3/3A Power Supply Troubleshooting B+ Regulator Troubleshooting B+ Voltage Too High: This symptom can be a little troublesome to work with because the unit will be going into shutdown protect and there is the possibility of damaging components (particularly the horizontal output transistor). Once again, the main relay is going to be jumped, but this method works quite well if the proper steps are carefully followed.
4. RA-3/3A Shutdown and Self-Diagnostics Chapter 4 - RA-3/3A Shutdown and Self-Diagnostics Overview Another new feature introduced in the RA-3 Chassis is self-diagnostics capability. By utilizing the timer LED on the front panel, it can be flashed in sequences when a failure occurs to assist in troubleshooting. It works rather well in most situations, but can also mislead the technician.
4. RA-3/3A Shutdown and Self-Diagnostics Protection Circuits Not Covered By Self-Diagnostics There are four protect circuits that are not monitored by diagnostics. Consequently, they will not be identified by the timer LED or stored into the diagnostics page. Referring to Figure 4-1, the standby 5V regulator IC655 is protected against over-voltage to its input and excessive current at the output.
5. RA-3/3A Deflection Circuits Chapter 5 - RA-3/3A Deflection Circuits Overview Like the RA-2 chassis, the RA-3 utilizes a simple deflection circuit design much like those found in many of the direct-view models. Figures 5-1A and 5-1B illustrate the simplicity of this design. High voltage and horizontal sweep are accomplished with a single horizontal output transistor driving a flyback transformer and deflection yokes.
5. RA-3/3A Deflection Circuits CN506 FROM Q502 T504 FBT TO HY H OUT BLOCK COLLECTOR 200V 135V HEATERS CN505 +12V FOCUS R584 PACK D522 CN502 R548 R545 -12V C536 R598 CN504 D532 R594 R586 D528 C541 IC502 R536 R538 TO A C550 R544 C547...
5. RA-3/3A Deflection Circuits Once the new transistor has been installed, it is always a good idea to re-solder the connections on the horizontal drive transformer. These transformers handle a lot of current to forward bias the B-E junction of the output transistor.
5. RA-3/3A Deflection Circuits to the horizontal deflection yoke return. One more waveform is required, however. Vertical rate parabolic correction cannot be injected directly into the horizontal circuit, which is tuned for 15.75KHZ. The parabolic correction must be gated to provide horizontal-rate pulses that can be accepted by the horizontal deflection circuit.
It is almost a given that F651 and/or F652 on the G board will also open. . The first check that you should perform (and this applies to all Sony televisions of the last seven years) is to check the voltage level of the clock and data lines on the I C bus.
5. RA-3/3A Deflection Circuits Check for V drive out of pins 34 and 35 of the Y/C Jungle IC206. Since this unit shuts down during a vertical failure, you will have to override by shorting the main relay. Unplug all three CRT sockets when doing this. It is obvious why this unit shuts down during a vertical failure.
6. RA-3/3A Video Process Troubleshooting: T & S Models Chapter 6 - RA-3/3A Video Process Troubleshooting: T & S Models Overview One of the more significant video features introduced in the RA-3 chassis was addition of component video input. This was added to all models from the T series all the way up to the V line. Since DVD and satellite boxes were offering this video format, it was a welcomed addition, which took advantage of its better picture quality capabilities.
6. RA-3/3A Video Process Troubleshooting: T & S Models overall view of the video path. More detailed block diagrams will appear towards the end of this section. They can also be found in the TVP-10 training manual. The goal at this point is to isolate the area in which the problem exists and since there is a main and sub video path along with OSD, these features can be used to help locate where it is occurring.
6. RA-3/3A Video Process Troubleshooting: T & S Models With AKB and high voltage ruled out, the following tests can be performed: The OSD feature is the first tool. Press the menu button on the remote. If you do not have a remote, press channel up or down.
IC206 is the cause. Many A boards have been be ordered and installed and the problem would still exist. It is important to remember that on all Sony televisions, the OSD will not function until the unit has completed all initialization routines and this includes the AKB circuit.
6. RA-3/3A Video Process Troubleshooting: T & S Models IC1905 PIP PROCESSOR SDA9288 Q1916 TO IC1901/6 Q1914 Q1917 Q1918 YOUT YUV SW. BUFFER Y IN Y AMP BUFFER BUFFER U IN UOUT RY IN Q1905 TO IC1901/1 VOUT V IN BUFFER RY OUT X IN...
6. RA-3/3A Video Process Troubleshooting: T & S Models V Model Video Troubleshooting These models have several additional features not found on the lower-end sets. A 3D comb filter provides higher quality cross-talk separation along with noise reduction circuitry for the Y component. This is why the S video inputs are routed through the comb filter.
6. RA-3/3A Video Process Troubleshooting: T & S Models view video where it is inserted into the Y/C Jungle into a separate port. By engaging this function, you can get a good idea of where the video loss is occurring. When the twin boxes appear, the main video source will be displayed in the right box and the sub video in the left.
6. RA-3/3A Video Process Troubleshooting: T & S Models IC202 4MB EDO MSM514265C D BOARD DYC0 2 31 Q210 Q210 BUFFER 5 34 IC203 DYC0 BUFFER I016 CONVERTER 7 36 FL203, uPC659 Q215, 10 39 ALTE MRAS B.P.F. Q206,212 Q201, 204 LCAS IC204 BUFFER...
6. RA-3/3A Video Process Troubleshooting: T & S Models MAIN C FROM IC1702/58 Q1418 DY FROM IC1405/86 EY IN YOUT BUFFER CN204 Q1420 Q220 ERY IN DU FROM IC1405/90 PB-Y RYOUT ROUT BUFFER BUFFER Q219 GOUT BUFFER TO CG Q1419 EBY IN DV FROM IC1405/88 PR-Y...
Chapter 7 - Troubleshooting the RA-4 Chassis Overview The RA-4 chassis represented a great leap forward for Sony in the rear projection television market. One of its most outstanding introductory features was the ability to perform line doubling of the standard 480i NTSC scan rate.
8. RA-4/4A Power Supply Troubleshooting Chapter 8 - RA-4/4A Power Supply Troubleshooting Overview The RA-4 chassis introduced a new, simpler, standby power supply. Major design changes occurred in the main power supply. An oscillator circuit was now being employed that was independent of the output stages. This oscillator provided the necessary drive signal to two, independent, driver circuits that shared the distribution of power requirements for the set.
8. RA-4/4A Power Supply Troubleshooting L6002 L6001 C6001 R6002 VD6001 TO STANDBY C6002 SUPPLY D6001 F6001 CN6004 SPARK FROM C6004 R6001 RY6001 TO SOFT POWER START RELAY PROTECTION SPARK Q6002 GAPS TO IC6003/2 Q6004 C6007 C6012 R6017 E AMP- SWITCHING D6002 R6031 L6003...
8. RA-4/4A Power Supply Troubleshooting VCC Switching This circuit is responsible for supplying power to the main relay along with the main oscillator and power switching circuits. It is quite different from conventional designs used in previous models. In Figure 8-3, it is shown that rather than using the relay high command from the CPU to directly control a relay drive transistor, an optical- isolator, IC6011, is turned on by Q6104.
8. RA-4/4A Power Supply Troubleshooting Regulation is provided by varying the operating frequency based on the error amp input at IC6003/pin 1. Initial soft start is provided by keeping Q6006 on for about three seconds at turn on due to C6016 charging. This will pull down the regulation error loop and cause the IC to run at high frequency while the secondary voltages are charging their filter capacitors.
8. RA-4/4A Power Supply Troubleshooting Two rapid relay clicks followed by a third click one to three seconds later: If this condition occurs, the unit is going into protect mode. The timer LED may assist you on this problem as this unit utilizes self-diagnostics although not all protect lines are monitored.
8. RA-4/4A Power Supply Troubleshooting is the most common result obtained. IC1601 and its connection to the 135V line are the next check. The most common cause of excessive B+ is an open or increase in value of the resistor connecting the 135V to IC1601 (R6115 in this chassis).
9. RA-4/4A Protect Circuit Troubleshooting Chapter 9 - RA-4/4A Protect Circuit Troubleshooting Overview The protect circuits in the RA-4 chassis contain several additional sections of monitoring than the RA-3. The high voltage and horizontal deflection circuits are separate, so monitoring deflection loss is necessary. Several more low voltage lines are also monitored.
9. RA-4/4A Protect Circuit Troubleshooting Audio: DC voltage has been detected on one or both of the audio out lines. The set is shut down to protect the speakers. This is usually caused by shorted audio amp IC406. WDT: A communications error has occurred. The main CPU is unable to communicate with the Y/C jungle IC. The timer LED blinks continuously at one-second intervals and as soon as 101 of them occur, a failure is registered.
9. RA-4/4A Protect Circuit Troubleshooting The other lines monitored are not detected by IC1009 and, therefore, will not be indicated by the self-diagnostics. Figure 9-2 provides a detailed view of these. This includes over-current (or loss of) the +19, +22 and +7 volt lines.
10. RA-4/4A Deflection Circuit Troubleshooting Chapter 10 - RA-4/4A Deflection Circuit Troubleshooting Overview With the introduction of scan line doubling, the RA-4 chassis introduced new circuit designs. The horizontal scan rate operates at 31.5KHZ instead of the conventional 15.75KHZ. The YC/Jungle IC is replaced by a separate video process (IC511) and a horizontal jungle (IC507).
10. RA-4/4A Deflection Circuit Troubleshooting Figure 10-2 illustrates the output section of the horizontal deflection stage. Since no flyback transformer is utilized, pulses will be generated by the collapse of the field in the horizontal deflection yokes and T5002. This transformer will provide a boosted voltage for the dynamic focus correction circuit via R5055 and D5015.
10. RA-4/4A Deflection Circuit Troubleshooting Once the new transistor has been installed, it is always a good idea to re-solder the connections on the horizontal drive transformer. These transformers handle a lot of current to forward bias the B-E junction of the output transistor.
10. RA-4/4A Deflection Circuit Troubleshooting R5023 R5058 R5013 Q5009 CN506 H D5006 R5020 D5002 PROTECT C5011 TO IC1009/PIN 3 Q5015 A BOARD R5004 R5063 C5002 C5020 D5014 Q5019 C5026 D5008 R5018 FROM R5072 C5041 Q5006 R5042 R5069 R5033 AC VOLTAGE R5030 Q5014 R5068...
10. RA-4/4A Deflection Circuit Troubleshooting IC512 VDSP A BOARD CXD2018A FROM R713 H IN FROM IC1008 1/2 H MAIN CPU IC508/5 R709 R779 C675 R757 V DRIVE XSOP R756 IC514 C678 C644 C651 FROM R692 R534 R700 TO IC507/2 BOARD H JUNGLE CN5004 IC516/3...
IC has not cured the problem? The first check that you should perform (and this applies to all Sony televisions of the last seven years) is to check the voltage level of the clock and data lines on the I C bus.
11. RA-4/4A High Voltage Circuit Troubleshooting Chapter 11 - RA-4/4A High Voltage Circuit Troubleshooting Overview The RA-4 chassis reintroduced the separate high voltage circuit that had been eliminated in the RA-2 and RA-3 chassis. This design offers better control of the high voltage level, resulting in more stable brightness and picture size fluctuations.
11. RA-4/4A High Voltage Circuit Troubleshooting If a clean pulse appears with AC current staying well below 1.5 amps, re-connect Q8008 and Q8002 (or the short if you disabled it this way). Apply power once again and continue monitoring the flyback pulse. Do not worry about excessive high voltage problems.
11. RA-4/4A High Voltage Circuit Troubleshooting TO HV R8119 R8128 R8139 PROTECT 2 IC8008/3 R8136 C8082 IC8007 1/4 C8070 7.2V C8076 R8174 TO IC8002/5 R8126 BLOCK HV REGULATION CN8006 6.9V C8068 D8041 Q8024 IC8007 1/4 RD13M R8127 C8052 +12V Q8025 R8093 D BOARD R8138...
Chapter 12 - RA-4 Video Circuit Troubleshooting Overview As mentioned earlier in this manual, the RA-4 chassis introduced Sony’s first rear projection television with line doubling capability. New circuitry was designed to perform this task. The DRC , or digital reality creator, was added to assist in doubling the horizontal scan lines by interpolating the video information for each of the 480 interlaced lines of the incoming NTSC signal.
12. RA-4 Video Circuit Troubleshooting MAIN Y/COMP. IC1305 IC306 TU501 MAIN IC1307 BOARD MAIN CHROMA YUV SW. COMB MAIN TUNER DECODER CCD MIX FILTER MAIN Y TU501 COMPOSITE IC511 VIDEO BOARD IC1008 IC515 TUNER PROCESSOR MAIN A/V SWITCH CM501 GLASS COMB COMPOSITE IC1302...
12. RA-4 Video Circuit Troubleshooting Video Appears In Both Boxes: The main and sub video process paths are working correctly. The MID is sending the video directly into IC511. The problem is likely located on the BR board. The DRC circuit on this board is constantly running and not controlled by the I²C bus.
12. RA-4 Video Circuit Troubleshooting TO Q1354/B LUMINANCE BUFFER DYC00 A BOARD TO Q1358/B CHROMA DYCO1 BUFFER Q1349 IC1306 R1414 3D COMB FILTER FROM uPD64081BGF-3BA IC1305/30 LUMINANCE/ COMPOSITE FSCI Q1348 R1434 C1496 FROM Y BUFFER DYC09 C1493 Q1448 DYC02 R1544 IC1309 C1490 8 BIT ADC...
12. RA-4 Video Circuit Troubleshooting Q1366 IC1307 MAIN YUV SW. C1483 CV-Y CCD MIX R1543 CLPP CXA2119M SELY R1546 FROM COMB FILTER AYO C1376 IC1306/84 Q1367 R1393 Q1328 N FROM COMB FILTER ACO R1401 Q1331 IC1306/83 R1400 C1385 R1405 C1381 R1402 C1332 Q1332...
12. RA-4 Video Circuit Troubleshooting FROM Q1343 TO Q1324 FSC DETECT. CCD BUFFER FROM Q1366/E COMPOSITE Q1328 VIDEO Y C1482 TO IC1305/34 MAIN CHROMA DVD Y CV Y SEL Y R1538 C1457 FROM IC1305/18 Y1 IN IC1307 C1456 MAIN YUV SWITCH CB1 IN FROM IC1305/19 CXA2119M...
12. RA-4 Video Circuit Troubleshooting FROM CN516 A BOARD 8 BIT Y CN302 8 BIT CN301 RC-Y M-B-Y M-R-Y IC306 IC305 RC-B-Y 8 BIT C 3 CH 8 BIT CN302 8 BIT IC562 RC-VD A BD. CN511 CONV. IC304 RC-HD CDX2070Q IC644 IC645...
12. RA-4 Video Circuit Troubleshooting CN001 CN002 IC014 S-B-Y IC003 M-B-Y SBADC MAIN ADC S-R-Y M-R-Y M VD IC002 M HD B CH S-HD S-VD IC008 IC010 C CH CONTROLLER IC013 MEMORY IC001 MEMORY MID-V MID 12C MID-H MID Y-S MID R-Y MID B-Y IC009...
12. RA-4 Video Circuit Troubleshooting FROM IC1008/61 0 SYNC SEL CN002 CN513 CN503 Q524, Q540 EY IN R OUT BUFFER Q516, Q539 ECB IN G OUT BUFFER ECR IN TO CN701 Q510, Q538 B OUT CR BOARD Q546 BUFFER TCACR SW Q530 Q501 IK IN...
1. Features Chapter 13 - Troubleshooting the RA-4A Chassis Overview The RA-4A chassis shares many of the circuit designs with its predecessor, the RA-4. It is still reserved for use in the high-end XBR series, which includes the KP53XBR300 and the KP61XBR300. Its greatest feature was the introduction of a “high definition ready”...
14. RA-4A Video Circuit Troubleshooting Chapter 14 - RA-4A Video Circuit Troubleshooting As illustrated in Figure 14-1, many of the same processes are performed to the incoming video signals. All composite and S video sources are routed through the 3D comb filter and chroma decoder for the main video signal.
14. RA-4A Video Circuit Troubleshooting H + V SYNC IC511 TO DEFLECTION VIDEO PROCESSOR SYNC CIRCUITS TO TUBES INPUT 12 H SYNC O720P TO IC515 FROM FOR AUDIO OSD CPU SWITCHING IC1009/61 IC1403 IC1307 IC1303 MAIN YUV MAIN YUV INPUT SELECT 480I ODTV...
14. RA-4A Video Circuit Troubleshooting Gray Background Appears With Two Black Boxes: IC511 is OK. This signal is generated by the MID . The main and sub video paths are not working. Since a failure in both paths at the same time is unlikely, suspect A/V switch, IC515 or a crack in the board.
Chapter 15 - Troubleshooting the RA-5A Chassis Overview The RA-5A chassis is Sony’s first high definition, 16:9 aspect ratio, rear projection television to incorporate a DTV tuner and decoder as an integrated part of the chassis. This tuner/decoder assembly is known as the “Q Box”. It contains a HDTV tuner, MPEG2 and Digital Dolby®...
16. RA-5A Power Supply Troubleshooting Chapter 16 - RA-5A Power Supply Troubleshooting Overview The standby power supply has been changed from a switch-mode to a conventional, analog type. Although simple to troubleshoot, it will be covered since it contains an OVP monitoring circuit that can cause the unit to shut down.
16. RA-5A Power Supply Troubleshooting Activating the oscillator is accomplished by closing the main power relay RY6001 when the set is turned on. This will provide approximately 340VDC to Q6008, a startup voltage to pin 18 of IC6002 along with a sample of the unregulated B+ to pin1.
16. RA-5A Power Supply Troubleshooting Troubleshooting the Primary Supply Since this supply is the starting point for the operation of all necessary power supply operating voltages, it can generate erroneous symptoms that could lead a technician in the wrong direction. The secondary supply is dependent on the primary supply running.
16. RA-5A Power Supply Troubleshooting business. This supply has ± supply rails, so do not forget to read across them for low resistance readings. A quick visual check for overheated components is also a good idea. Check for open fuse links on the secondary lines, as these are valuable clues.
17. RA-5A Protect Circuit Troubleshooting Chapter 17 - RA-5A Protect Circuit Troubleshooting Overview As illustrated in Figure 17-1, several circuits are monitored for protection. Some lines are monitored by the self- diagnostics feature while others are not. The self-diagnostics feature can assist in isolating a particular circuit. Below is an example of the diagnostics page which is entered by pressing “DISPLAY”, “5”, “VOL –”, and “POWER”: Self Check +B OCP...
17. RA-5A Protect Circuit Troubleshooting The above protection circuits have dedicated communications line with IC001. The 135V OCP/OVP, Low B and H Stop have direct connections. V Stop and AKB notify IC001 by way of the video process IC3006, which announces the event via the data bus line.
17. RA-5A Protect Circuit Troubleshooting Shutdown – No Diagnostics Indication Since RY6001 and RY6002 are engaging, there are the five monitoring circuits mentioned earlier that will cause the unit go into protect as shown in Figure 17-2. Monitoring AC current draw while letting the unit go into protect will assist in determining whether the failure is current, or voltage related and steer you to the circuits to check first.
18. RA-5A Deflection Circuit Troubleshooting Chapter 18 - RA-5A Deflection Circuit Troubleshooting Overview The deflection circuits in the RA-5A chassis are similar to the RA-4/4A chassis in that horizontal sweep and HV are generated in separate circuits. Pincushion correction is performed in a different manner and HV protection is not monitored as part of the self-diagnostics feature.
It is a drive component with heavy current usage and heat dissipation, and it is usually the cause of the failure. The first check that you should do (and this applies to all Sony televisions of the last seven years) is to check the voltage level of the clock and data lines on the I C bus.
18. RA-5A Deflection Circuit Troubleshooting Repeat Vertical Output IC Failure: If IC1509 fails immediately upon replacement or soon thereafter; it is usually the fault of C8015. This is the boost capacitor. It charges to almost 30VDC during the lower half of the vertical sweep to provide additional voltage to allow the beam to retrace to the top rapidly.
19. RA-5A High Voltage Circuit Troubleshooting Chapter 19 - RA-5A High Voltage Circuit Troubleshooting Overview Figure 19-1 illustrates a block diagram to give an overall view of the circuitry on the D board for generating high voltage. The main components consist of a regulator stage to vary the B+ level to the flyback transformer for HV level control, a driver and output stage to switch the flyback on and off, a flyback transformer to generate HV and a LOT transformer to generate heater voltage and 200VDC for CRT cathode bias.
19. RA-5A High Voltage Circuit Troubleshooting Troubleshooting High voltage circuit failures generally fall into four categories: No HV, low HV, excessive HV and excessive current. The latter two will cause the HV circuit to cease operating and, depending on which protect IC detected the problem, may shut the entire set down.
19. RA-5A High Voltage Circuit Troubleshooting than 7.5V, the HV block is defective. If it is significantly lower, check the PWM signal at pin 3. If the positive duty cycle exceeds the negative, IC8008 is sensing the low HV and trying to compensate. Check for clean pulses at Q8038-C.
20. RA-5A Video Path Troubleshooting Chapter 20 - RA-5A Video Path Troubleshooting Overview The RA-5A chassis incorporates a DTV tuner and decoder circuits in a shielded board known as the “Q Box”. MPEG2 decoding of ATSC broadcast signals along with Digital Dolby® decoding circuitry allows for reception of all current formats.
20. RA-5A Video Path Troubleshooting IC7205, IC7603 CRT B QM BD. C BD. DTV TUNER MAIN SIGNAL PATH AND PROCESS NTSC INPUT/ PIP CRT G IC8801 CRT R IC7806, IC8601 IC7807 IC8703, IC8902 MID PROCESS NTSC PROCESS MAIN MN-SB- CN8601/ PATH CN8801 CN005...
20. RA-5A Video Path Troubleshooting Video Appears in Right Box Only: The sub-video path is working correctly. An interruption in the main video processing has occurred. The problem is likely to be on the B board since most of the processing occurs there. The Q Box routes the main and sub-video into the MID circuits for side-by-side display.
1. Features Chapter 21 - Troubleshooting the RA-6 Chassis Overview The RA-6 chassis is found in the KP51HW40 and KP57HW40 models. It provides an affordable “high definition ready” set with a 16:9 aspect ratio. It is also found in the KP43HT20, KP53/61HS20 and KP53/61HS30 as a “High Scan”...
22. RA-6 Power Supply Troubleshooting Chapter 22 - RA-6 Power Supply Troubleshooting General Description The power generation and distribution has been simplified by utilizing a traditional analog standby supply providing unregulated B+ for the main AC relay and regulated 5V for the main CPU, NVM and IR receiver (not shown). More detail on this circuit will be covered later in the shutdown troubleshooting section.
22. RA-6 Power Supply Troubleshooting AC H RY6002 AC L R6050 R6002 D6007 RY6003 R6064 R6040 0.1 1/2W R6038 D6002 R5007 Q6006 R6037 IC5003 0.47 R6003 C6047 T6001 D6009 -5V REG PH6002 D6004 D6005 SENSE D5010 IC5004 D5006 D6003 +6V REG Q6005 R6008 +11V...
22. RA-6 Power Supply Troubleshooting Dead Supply. Switching Transistors Shorted: A more cautious approach must be taken when this happens. There is slight possibility that excessive current or a higher possibility that line transients caused them to fail and the loss of a newly installed set is not only frustrating, but costly in parts and wasted time. Static resistance readings of the secondary lines to ground are the first order of business.
22. RA-6 Power Supply Troubleshooting 3. If a problem exists that warrants protection, a third relay click will be heard. This is actually RY6002 and RY6003 releasing simultaneously and will occur from one to several seconds later. Refer to Chapter 23 for troubleshooting the protect circuits.
23. RA-6 Protect Circuit Troubleshooting Chapter 23 - RA-6 Protect Circuit Troubleshooting General Description As illustrated in Figure 23-1, several circuits are monitored for protection. Some lines are monitored by the self- diagnostics feature while others are not. The self-diagnostics feature can assist in isolating a particular circuit. Below is an example of the diagnostics page which is entered by pressing “DISPLAY”, “5”, “VOL –”, and “POWER”: Self Check: +B OCP...
23. RA-6 Protect Circuit Troubleshooting AUDIO: DC voltage has been detected on the speaker lines. This is usually caused by audio output IC708. The audio circuits are located on the A board. WDT: A communications error has occurred. The main CPU is unable to communicate with the Y/C jungle IC. The timer LED blinks continuously at one-second intervals and as soon as 101 of them occur, a failure is registered.
23. RA-6 Protect Circuit Troubleshooting Shutdown – No Diagnostics Indication The first step necessary is to listen for the sequence of relay clicks when the unit is powered up. If two clicks are heard less than 500ms apart followed by a third click at least one second later, the protect circuit is activating. The initial rapid clicks indicate the main supply is powering up and the inrush relay RY6003 is activating.
24. RA-6 Deflection Circuit Troubleshooting Chapter 24 - RA-6 Deflection Circuit Troubleshooting The deflection circuits in the RA-6 chassis are identical to the RA-5A chassis in that horizontal sweep and HV are generated in separate circuits. Horizontal Deflection Troubleshooting Referring to Figure 24-1, horizontal sweep is generated in the conventional way using an H drive signal from pin 40 of IC309 on the A board.
It is a drive component with heavy current usage and heat dissipation, and it is usually the cause of the failure.. The first check that you should perform (and this applies to all Sony televisions of the last seven years) is to check the voltage level of the clock and data lines on the I C bus.
24. RA-6 Deflection Circuit Troubleshooting Repeat Vertical Output IC Failure: If IC1509 fails immediately upon replacement or in a short amount of time, it is usually the fault of C8015. This is the boost capacitor. It charges to almost 30VDC during the lower half of the vertical sweep to provide additional voltage to allow the beam to retrace to the top rapidly.
25. RA-6 High Voltage Circuit Troubleshooting Chapter 25 - RA-6 High Voltage Circuit Troubleshooting General Description Figure 25-1 illustrates a block diagram in order to provide an overall view of the circuitry on the D board for generating high voltage. The main components consist of a regulator stage to vary the B+ level to the flyback transformer for HV level control, a driver and output stage to switch the flyback on and off, a flyback transformer to generate HV and a LOT transformer to generate heater voltage and 200VDC for CRT cathode bias.
25. RA-6 High Voltage Circuit Troubleshooting Troubleshooting High voltage circuit failures generally fall into four categories: No HV, low HV, excessive HV and excessive current. The latter two will cause the HV circuit to cease operating and a high will be sent to IC704 on the A board to place the unit into protect-mode.
25. RA-6 High Voltage Circuit Troubleshooting High Voltage Shutdown: Verification of an over-voltage or over-current condition must be checked first. Monitor the AC current draw at shutdown to determine which is causing the condition. Excessive Current: If the AC current exceeds 2A or more immediately at turn-on, begin by disconnecting the HV block from the circuit.
26. RA-6 Video Circuit Troubleshooting Chapter 26 - RA-6 Video Circuit Troubleshooting General Description The video process circuitry in the RA-6 chassis follows a similar processing path as the RA-5A chassis with the exception on an on-board DTV tuner and decoder. Two NTSC tuners are incorporated along with video inputs 1~4 to allow the connection of composite or S video sources.
26. RA-6 Video Circuit Troubleshooting CV/Y MAIN TUNER IC303 COMB MAIN SUB TUNER U BOARD VIDEO 1 IC305 IC004 IC2007 VIDEO 2 SWITCH A BOARD SWITCH COMB VIDEO 3 SUB Y IC301 VIDEO 4 SUB C VIDEO 5 IC306 COMP. VIDEO 6 S W .
26. RA-6 Video Circuit Troubleshooting Video failures fall into three main categories: 1. No video 2. Distorted video 3. Improper level Although the video signals are routed through many different paths depending on the type of signal being received, these different pathways can be used to an advantage when diagnosing video failures. The picture & picture feature provided by the MID circuitry provides a useful diagnostic tool.
26. RA-6 Video Circuit Troubleshooting CV : 1V p-p MAIN MAIN MAIN Y/CV TUNER TO 3D COMB U BOARD CV IN RF CH 13 (480i) MAIN C 75% CB IC2007 CV : 1V p-p 2D COMB TUNER CV IN CXD2073 CV : 1.5V p-p CV IN CV IN...
26. RA-6 Video Circuit Troubleshooting Y : 0.9V CXA2103-1 SCON,SCOL,SHUE (ADJUST RF,VIDEO,& DVD C : 0.5V IC303 YCT-MAIN A BOARD PD6482 CXA2103 3D-COMB MAIN 37,38,39 22,23,24 Y/CV C Y : 1.2V 88 96 : 1.1Vp-p Y : O.7V 1.1Vp-p (MAIN) 480i : 0.5Vp-p CV : 0.9Vp-p 0.5Vp-p...
26. RA-6 Video Circuit Troubleshooting IC3303 D.R.C. INPUT SIGNAL 480i ONLY CXD29095Q C : 8 BIT YP 8 BIT Y : 8 BIT 174-181 164-171 122-154 3.2Vp-p 3.2Vp-p DIGITA DIGITA Y :1.0Vp-p 0.9Vp-p 0.9Vp-p 6-13 17-24 IC3304 FROM 8 BIT TLC5733A IC305 [MAIN]480P/1080i...
Chapter 27 - Troubleshooting the AKB Circuits Overview The AKB (Automatic Cathode Bias) circuit, often referred to as IK, has been incorporated into Sony televisions for many years. In the beginning it created problems for technicians because they were either unaware of it or did not understand how it worked.
27. Troubleshooting the AKB Circuits If you could actually “see” the IK pulses, troubleshooting would be a snap. If the service mode is entered on a direct-view television, the VPOS can be adjusted to bring the picture centering down and the three IK pulses can be seen as faint lines.
27. Troubleshooting the AKB Circuits CRT elements, improper G2 cutoff or intermittent components, or connections on the IK return line (rare). Verify G2 cutoff and adjust if necessary. If G2 was set too low, this may have been the problem. Measure the DC voltage on all three cathodes.
28. Auto Registration Troubleshooting Chapter 28 - Auto Registration Troubleshooting Overview The RA-4 projection television chassis was the first to introduce a new registration system for converging the red, green and blue colors of each CRT. The number of course adjustments were substantially reduced. SUB, MID, BOW and 4 -family wave adjustments were eliminated.
28. Auto Registration Troubleshooting verified with a calibrated external source, the internal crosshatch can be centered by changing and saving the value of “TPHP” and “TPVP” at the beginning of the PJE group. When replacing an A board in most models, the NVM for the main CPU will be flashed with default data. This is general service data.
28. Auto Registration Troubleshooting Fortunately, the RA-5A and RA-6 chassis have included a new set of instructions known as “COPY” and “ALCOPY”. Convergence is adjusted in the FULL mode, saved and Flash Focus offset rewritten. ALCOPY is selected from the PJE menu and the data changed from 0 to 1. Pressing “Mute” – “Enter” copies the data from the FULL mode to all the others.
28. Auto Registration Troubleshooting The configuration shown will adjust horizontal centering and skew based on the top and bottom sensors and horizontal size by using the left and right pair. Vertical centering, skew and vertical size will occur by the flags changing their position by 90°...
28. Auto Registration Troubleshooting Flash Focus Errors The primary causes of errors appearing during a Flash Focus session are: 1. Insufficient brightness level of the flags striking the sensor(s). 2. One or more of the colors “out of range” of the sensors. 3.
28. Auto Registration Troubleshooting A single digit change in the data for each option will move the affected flag a considerable distance. These alignments should only be adjusted if the flags display unevenly after correct centering, size and skew have been confirmed with a calibrated source.
28. Auto Registration Troubleshooting Below is a list of possible error codes and suggested remedies. Table 28-1 ERROR CODE DESCRIPTION REMEDY Check if flags are hitting sensor properly. Adjust Sensor 0 low output VUP if necessary. Could be a sensor problem. Check if flags are hitting sensor properly.