Sony DTV-01 Manual
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Sony DTV-01 Manual

High definition television
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Training Manual
®
High Definition
Television
Circuit Description and Troubleshooting
Course: DTV-01

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Summary of Contents for Sony DTV-01

  • Page 1 Training Manual ® High Definition Television Circuit Description and Troubleshooting Course: DTV-01...

  • Page 2: Table Of Contents

    Table of Contents POWER SUPPLY Introduction Power Supply Block HDTV Transmission Stream Standby Power Introduction to MPEG-2 Compression Converter 2 Model KW-34HD1 - Normal Operation Overall Protection Block Inputs D Board Protection Block Overall Block Protection Circuit 1 SIGNAL PROCESS Protection Circuit 2 Video Block 1 Protection Circuit 3...
  • Page 3 Dynamic Focus 1 - B+ Mfg. Dynamic Focus 2 - Location Dynamic Quadrapole Focus Appendix Set-Back Box Picture Size Modes Board Replacement Service Mode Display...

  • Page 4: Introduction

    Digital Transmission Formats Introduction There are 18 approved digital transmission formats. The first six offer HD signals in a 16x9 aspect ratio. The remaining 12 formats are SD signals TV Transmission Formats in progressive (p) or interlaced (i) scan. Although not high resolution, they Standard Definition/High Definition offer significant improvements over the NTSC analog signal.
  • Page 5 How to use this book for servicing Service Mode Adjustment Notes When encountering this TV set for servicing there are several things you Because of this TV’s complexity, the following precautions should be noted need to know. Below is a list of the necessary servicing items and where while making service adjustments for convergence, video level, size, and to locate them: white balance or positioning:...

  • Page 6: Introduction To Mpeg-2 Compression

    Each sample we take of the video is represented by an 8 bit digital word Introduction to MPEG-2 Compression which translates to 2 or 256 different levels of each component. There- fore, each pixel is made up of 3 components which can represent up to (Y) X 2 (R-Y) X 2 (B-Y) = 2...
  • Page 7 Compression Process 4:2:2 Compression of Video is accomplished via the following process. Since the eye is less perceptive to color changes than to Luminance, 1. Selective Sampling significant reduction of data can be accomplished in the Sampling 2. Discrete Cosine Transform (DCT) process if we sample the color components (R-Y and B-Y) half as 3.
  • Page 8 4:2:0 The high frequency information consumes the most data real estate and is where we focus to compress in this next stage. DVD takes it to another level by using a modified 4:2:2 sampling struc- ture called 4:2:0. 4:2:0 samples R-Y half as much as Y and skips B-Y The process of eliminating the imperceptible information is called Dis- on the 1 line.
  • Page 9 Temporal Redundancy Data compression is accomplished by elimination of the high frequency Within Video scenes, there are many redundant frames. An example components designated by the zeros. would be an anchor person reporting the news. With the exception of lip movement, the other portions of the frame remain unchanged over time.
  • Page 10 P-Pictures The P-Pictures are Predictive Encoded Images also known as Inter- I or P Frames. Picture B-Pictures Predicted As the name indicates, a P-Picture is a predicted Image based on P Picture by looking previous I or P-Picture. The P-Picture is dependent on past Images to back at exist.
  • Page 11 I, P and B picture generation process Hoffman Encoding The last step in the MPEG process uses a statistical approach to com- To clearly understand the relationship between the I, P and B pictures press the data further. we need to understand how they are generated. The last process is called Hoffman Encoding.
  • Page 12 MPEG II additional information MPEG II –vs- MPEG I The MPEG process described is common to both MPEG II and MPEG I MPEG II is a broad standard which encompasses many resolutions thus, explaining the backward compatibility between the two. including HDTV.
  • Page 13 The Bit Rate Fluctuates For DVD, variable bit rate is a tremendous advantage. If the bit rate were fixed, it could not accommodate the changing needs of video scenes. Consider the fast-paced action of a football player, running for a touch- down as the camera pans past the crowd.
  • Page 14 24 Frames-per-Second Storage In video, what appears to be a continuously moving image is actually a series of discrete still pictures, called frames. Every video frame consists of two interlaced “fields”, each of which contains half the frame’s scanning lines. A U.S.-standard video picture runs at roughly 30 frames per sec- ond.
  • Page 15 NOTES...

  • Page 16: Model Kw-34Hd1 - Normal Operation

    Model KW-34HD1 - Normal Operation These are normal operating conditions for Sony’s first high Definition TV during power on/off and input selection conditions. Power ON Operation Initial Step Sounds Visual Conditions Plug in AC connection Nothing Nothing Front panel Master power button off...

  • Page 17: Input Selection

    Input Selection Input Connections Programming Steps Results VHF / UHF VHF / UHF antenna to rear panel “VHF / Power ON. See previous Power ON chart. UHF” F type connector. Use the remote TV/Video button to select TV. Snow or a TV station with a channel The remote ANT button toggles between VHF / UHF number will appear if you are correctly in and cable.

  • Page 18: Inputs

    This scope shot is taken of a video signal that produces a blue screen. Inputs The top waveform is composite video and contains a combined signal. The middle waveform is the chroma signal from the S video output. It RF Inputs contains the burst after the retrace blanking area.
  • Page 19 SET-BACK VHF/UHF DTV I/O DIGITAL (DTV) FOR USE WITH DOLBY DIGITAL KW-34HD1 OUTPUT ANTENNA (DTV TV) (OPTICAL) ONLY TV/VIDEO - VHF AND SETBACK BOX HDTV - CABLE RF (ANT) VIDEO 1 FOR USE WITH VIDEO 2 CABLE HD (1080) INPUT ONLY VIDEO 3 ANALOG INPUT...
  • Page 20 P M 3 3 9 4 , F L U K E & P H I L I P S These simple matrixes are found in ICs frequently labeled as decoders or are part of a processor. A video processor IC can contain an additional simple electric matrix to convert the R-Y signals to their base Red signal voltages by just adding the Y signal as (R-Y) + Y = R.
  • Page 21 SET-BACK VHF/UHF DTV I/O DIGITAL (DTV) FOR USE WITH DOLBY DIGITAL KW-34HD1 OUTPUT ANTENNA (DTV TV) (OPTICAL) ONLY TV/VIDEO - VHF AND SETBACK BOX HDTV - CABLE RF (ANT) VIDEO 1 FOR USE WITH VIDEO 2 CABLE HD (1080) INPUT ONLY VIDEO 3 ANALOG INPUT...

  • Page 22: Overall Block

    Air or cable selection by the Main Micro is performed at the input antenna switch (SW). Thereafter the signal path is the same. There are three main sections in Sony’s model KW34HD1 first generation VHF/UHF antenna or cable High Definition Television (HDTV): Input antenna switch (SW) 1.

  • Page 24: Power Supply

    Video processor Picture tilt and horizontal trapezoid correction RGB Driver Vertical drive (VD) signals not only feed the vertical deflection stage, but also the picture tilt stage that handles trapezoid correction. A controlled CRT cathodes level of vertical sawtooth (VD) signal is used for trapezoid correction. This HD Input correction signal is mixed with a DC voltage for tilt correction and applied This input is for an external HDTV (perhaps cable) box that receives and...

  • Page 26: Video Block 1

    Video Switch IC2006 selects the video for the main and sub pictures. It Ò Sony, Trinitron, and Twin View are registered trademarks of Sony. also sends the video through comb filters. The comb filters separate the composite video into their luminance (Y) and chroma (C) parts.

  • Page 28: Video Process A

    Video Switch Video Process A Five composite video inputs are applied to video switch IC2006. Serial data from Main Micro IC3251 (not shown) chooses which input signals The external video input from the rear panel and internal video from both take the main and sub picture signal paths.

  • Page 30: Video Process B

    DTV Selection Video Process B Switch IC2407 chooses between the main and DTV signal for the main picture path. The DTV signal is chosen only when: Signal Flow Viewing the HD or SD Digital TV signal as a sub picture (Twin View ·...

  • Page 32: Video Block 2

    The DRC digital circuitry does more than just double the lines, though that Video Block 2 is the primary objective. There are 525 NTSC interlaced lines input (480 viewable lines) to the DRC and 960i (i = interlaced) lines leaving. It is the Overview manner in which the extra lines are created that makes the DRC circuit unique.
  • Page 34 In reality, you don’t see the full 525 lines on the screen. Over 40 lines are the number of scanning lines with a circuit called a line doubler. Sony has consumed by the Vertical Blanking interval. This leaves roughly 480 lines been an active supplier of line doublers, particularly for professional video for the actual picture.
  • Page 35 A new solution: DRC ing both fields simultaneously in a 480-line “progressive” scan. Progres- Sony’s new Digital Reality Creation (DRC) circuitry is an all-new approach sive scanning combines the separate fields of odd-numbered lines and to the problem of visible scanning lines. Not only does DRC create a even-numbered lines.

  • Page 36: Digital Realty Creation

    Moreover, with DRC, each field is processed separately, so there’s never What it all means a need to compensate for motion between two fields. And while the dou- Digital Reality Creation circuitry greatly enhances the television viewing blers typically produce a scan of 480P, the DRC circuit produces a higher experience.
  • Page 37 NOTES...

  • Page 38: Mid - Multi Image Driver

    Digital it’s already rapidly changing. Multi Effects systems. Some (but not all) Sony televisions with MID will enable viewers to combine two different signal formats on the same screen. A blossoming range of image standards MID works by converting both signals to VGA (480P) display.
  • Page 39 Picture-in-Picture functionality. Sony’s Multi-image Driver bridges the gap between computing and television. You can surf the net at VGA resolution while you watch High Definition TV on the same screen. A new generation of PIP functionality...

  • Page 40: Video Process C

    Video Process C T w in V i e w P i c t u r e M a in S i g n a l P a t h C o m p o n e n t I n p u t O u t p u t P u r p o s e B u f f e r s...

  • Page 42: Video Block 3

    RGB Video Video Block 3 The RGB Video Processor signal outputs (pins 35, 37 and 39) are ampli- fied and inverted by the three Video Output ICs IC9001-3. Then they are Video Processor IC3005 Inputs applied to the picture tube’s cathodes to control electron intensity. There are several inputs to the Video Processor IC3005.

  • Page 44: Video Process D

    Automatic Cathode Balancing (AKB) Circuitry Video Process D The purpose of the AKB circuit (also known as the IK circuit) is to adjust the level of R, G or B drive signal to compensate for picture tube aging. The B board contains the Video Processor IC3005 and the Main Micro (not The AKB circuit starts in IC3005 at turn on by outputting a one-line pulse to shown).

  • Page 46: On Screen Display

    Character Insertion On Screen Display To make the display appear clean, the active video is blanked for that mo- ment while the character is inserted into the scan. The YS signal from OSD Components IC3251/pin 21 requests that IC3005/pin 49 perform this full blanking func- The on screen display circuitry consist of the following major parts: tion.

  • Page 48: Video Process E

    IK Output Circuitry Video Process E The picture tube’s cathode current flows through the video output ICs. A sample of that current is output from each IC at pin 5. The three IC outputs The video output stage has only two functions: (one for each color) are connected in parallel.

  • Page 50: Screen Voltage Control

    G2 Path Screen Voltage Control The current path from CN9002/pin 1 to ground is: 1. R9055, R9085, R9067, R9084 In other TV sets the picture tube’s G2 screen control was either: 2. Q9014 1. Part of the FBT assembly where a single lead was brought to the pic- 3.

  • Page 52: Power Supply Block

    Power Supply Block The power supply consists of several stages. Except for the standby power supply, the Main Micro IC3251 controls the operational sequence of the remaining stages. The stages are listed in the order of operation: • Standby Power supply •...
  • Page 54 Converter 1 Stage After the Main Micro turns on both the AC and degaussing coil relays, the Main Relay output (ch 2) turns ON Converter 1 using switch Q5007. How- ever, Q5007 acts like an AND gate, requiring a second input before con- verter 1 is turned ON.

  • Page 56: Standby Power

    The standby transformer T5503 and bridge rectifier D5502 apply approxi- Standby Power mately +23 volts to +12 and +5 volt regulators. The standby +5Vdc goes to the infrared remote control receiver and the Main Micro IC3521. Overview The standby +12 volts sent to the H1 board is applied to the Master Power switch.

  • Page 58: Converter 2

    Converter 2 Output 12Vp-p drive 150Vp-p MOSFETs signals from square wave Q5012 & IC5003/pins 1 63.4kHz @ Converter 1 and Converter 2 stages are similar. The only differences are Q5013 and 7. Q5012/Source how they first power up and what voltages they deliver to the TV. Transformer 286Vp-p rough Multiple...
  • Page 60 Regulation Effects PM3394, FLUKE & PHILIPS +5V @ IC5008/pin PH5003/pin Oscillator D5041 frequency corrective Output CH1!20.0 V= CH2! 100 V= CH3!10.0 V= STOP CH4!50.0 V= ALT MTB5.00us- 1.06dv ch2- Waveform Conv – IC5003 In/Out Name Location Voltage/div Effects of increased AC line voltage on Converter 2 Channel 1 Input drive IC5003/pin 10...
  • Page 62 Troubleshooting Possible Converter Symptoms/Causes Symptom Cause Reason Dead set MOSFET Output failure. Only one or both converters is/are F5001 open. dead. Kick start R5073 burnt. D5028 shorted Conv 2 failure. Relays click Loss of top or bottom drive Vertical stage not and stop.

  • Page 64: Overall Protection Block

    Further details about the self-diagnostics circuitry and its OSD for inter- micro routine is called the self-diagnostic program and found in many mittent problems are explained in the service manual. Sony Trinitron TV sets made since late 1997. Self Diagnostics Repair Strategy...
  • Page 66 Board Determination * Complete listings of this TV’s normal operating conditions in different modes are at the beginning of this book under “Normal Operation”. If the standby light does not blink but the unit shuts down, the problem is in Here is a partial list.

  • Page 68: D Board Protection Block

    H. Output OCP D Board Protection Block The current to the H. output and centering stages is also monitored by the protection sensing circuits on the D board. Q7003 watches the current Protection flowing from the +135V supply through the following sections before arriv- The protection circuitry on the G and D boards monitor the following items ing at the Horizontal Output device, Q4018: and shuts the TV off if there is a problem:...

  • Page 70: Protection Circuit 1

    The protection latch remains active as long as the Main Micro IC3251/pin Protection Circuit 1 71 is outputting a power ON command. Turning the TV OFF (IC3251/pin 71 then goes low) resets the Q5503 / Q5504 latch. Power ON The latch can be triggered by any of 12 inputs (see the Protection Block). In this diagram, only two items on the G board are monitored: The protection circuitry is connected to the power ON circuit to shut off the TV set.

  • Page 72: Protection Circuit 2

    amplifier Q5018 and Q5017 to shut down the TV and blink the light six Protection Circuit 2 times. A higher voltage at the +5V line means that Converter 2 is not regulating. Measure the +5V line with a peak hold DVM to verify the over The remainder of the protection sensing circuitry on the G board is shown voltage.

  • Page 74: Protection Circuit 3

    H Centering IC4003 OCP Circuit Operation without a visual indication, the problem is likely to be on the D board. In this Sony model KW34HD1 TV, the user can center the picture from the The sensing circuitry on the D board monitors the following: menu.
  • Page 76 PH4006 is used to monitor IC4003’s current and couple the excessive 5. Locate IC4004/pin 14 and monitor its voltage as you turn on the TV current protection signal to the protection latch that is referenced to ground. and it shuts down. The voltage here will rise to +8.35V and stay there. The current from the –15V supply passes through R4005 into IC4003/pin If it rises and comes down just before shutdown, the problem is ex- 3.

  • Page 78: Protection Circuit 4

    H. Output Supply OVP Circuit Operation Protection Circuit 4 The PWM B+ regulating circuit supplies voltage to the Horizontal Output Transistor Q4018. The following parts monitor this supply voltage: The shutdown latch and general sensing circuitry are located on the G board.
  • Page 80 D board Circuit Failure Detection 5. Locate IC4004/pin 14 and monitor its voltage as you turn on the TV and it shuts down. The voltage here will rise to +8.35V and stay there. If the unit shuts down but the standby light does not blink, the problem is in If it rises and comes down just before shutdown, the problem is ex- one of the seven remaining areas that are not monitored by IC3251.

  • Page 82: Vertical Deflection

    When +5V is applied, the vertical drive signal is made in IC1305 and output Vertical Deflection as an out-of-phase signal pair from pins 21 and 22. Each signal output is 2Vp-p. The purpose of this stage is to: The differential (out of phase) output signals are sent on long signal runs ¨...
  • Page 84 voltage limits). This pulse is output at IC7003/pin 3 and coupled by C7011 Picture tube protection to pin 6. The pulse boosts the +15Vdc Vcc at pin 6 to the amplitude of the If there is a loss of vertical deflection, the picture would collapse. The pulse.

  • Page 86: Horizontal Deflection Block

    The purpose of this stage is to: Horizontal Deflection Block 1. Make B+ voltage for the driver MOSFET. 2. Regulate this voltage. Both the horizontal driver and output stages have individual PWM stages 3. Increase the B+ voltage when a wide picture is called for. that supply regulated B+ voltage to them.

  • Page 88: Horizontal Drive

    Q1702 and Q1703 are buffers/drivers that provide a fixed current to drive Horizontal Drive the horizontal driver MOSFET device in the next stage (via CN1303/pin 10). H o rizo n ta l D rive r / O u tp u t sta g e PWM Shaper B lo cks M a jo r p arts...

  • Page 90: Horizontal Driver

    MOSFET/Transistor Characteristic Comparison Horizontal Driver A power MOSFET device in an N channel format is most similar to a NPN transistor in overall operation, just as a P channel device is similar to a This horizontal driver stage consists of: PNP.
  • Page 92 3. Connect the ohmmeter positive lead to the DRAIN. In the previous stage a positive pulse is made and enters this stage from If the device is good you will get a resistance reading of about 400-1k CN1304/pin 10. This pulse resets a ramp that is applied to IC4004. IC4004 ohms.

  • Page 94: Horizontal Output Pwm 1

    Horizontal Drive Pulse First Delay Horizontal Output PWM 1 Monostable multivibrator (MMV) IC1704/pins 2-13 and comparators IC1705/ pins 1-7 perform the first delay. The output at CN1303/pin 9 is a delayed The purpose of the Horizontal Output PWM stage is to manufacture a low going pulse.
  • Page 96 Additional Circuits P M 3 3 9 4 , F L U K E & P H I L I P S c h 1 The purpose of the IC1704 MMV at pins 9-5 and the comparator at IC1705/ c h 2 pins 2-5 is to provide an operating window for the low output pulse leaving c h 3 c h 4...

  • Page 98: Horizontal Output Pwm 2

    P M 3 3 9 4 , F L U K E & P H I L I P S Horizontal Output PWM 2 c h 1 : p k p k = 2 . 9 5 V c h 2 : p k p k = 8 . 5 6 V The purpose of the entire Horizontal Output PWM stage is to manufacture a regulated B+ source for the horizontal output transistor.
  • Page 100 Summary The regulation path that corrects for B+ variations can be shown in this chart that begins with an increased load that reduces the B+: R e g u la t io n f o r I n c r e a s e d L o a d P W M B + E r r o r o u t A m p...

  • Page 102: Pincushion Correction

    Pincushion Correction P M 3 3 9 4 , F L U K E & P H I L I P S c h 1 : p k p k = 2 . 0 6 V c h 3 : p k p k = 1 2 . 0 V Electronic pincushion correction is necessary because it is difficult for the yoke to generate perfectly uniform magnetic fields in all areas.
  • Page 104 P M 3 3 9 4 , F L U K E & P H I L I P S c h 1 : p k p k = 1 . 5 8 V c h 3 : p k p k = 1 2 . 0 V C H 1 ! 1 .

  • Page 106: Picture Tilt Circuit

    User Tilt Adjustment Picture Tilt Circuit The user has an on screen display (OSD) menu number that displays the tilt amount from –10 to +10. The number zero should correspond to no This circuit produces a signal that is applied to the black N/S coil sus- DC voltage entering the N/S coils if the coarse tilt adjustment in the ser- pended around the plastic yoke frame by the picture tube bell.
  • Page 108 Horizontal Trapezoid Correction Additional Components In addition to tilt correction, the N/S coil also performs a mild trapezoid A d d it io n a l C o m p o n e n t s D e v ic e P u r p o s e (keystone) picture correction.

  • Page 110: Dynamic Focus Block

    Dynamic Focus Dynamic Focus Block DC Voltage for Static Focus Voltage (fv) is applied to the focus electrode of the picture tube from the FBT T7002. This establishes focus on a curve or Static Focus arc just behind the flat CRT screen. An electron beam within the picture tube consists of many electrons that Dynamic focus voltage comes from transformer DFT T7001.
  • Page 112 The top pulse mfg. A block compares the input ramp to a DC voltage to Output Waveform produce a pulse. By changing this DC voltage, the pulse width can be A lower DC voltage of 71Vdc in normal picture width causes just the peaks controlled for more or less dynamic focus correction.
  • Page 114 Pulse Manufacture Dynamic Focus 1 – B+ Mfg. The horizontal rate ramp signal is input at IC1502/pin 9 and a DC voltage is input at pin 8 of this comparator. This DC voltage input at pin 8 governs This first half of the dynamic focus circuitry stage consists of several parts: the output pulse width at IC1502/pin 14.
  • Page 116 P M 3 3 9 4 , F L U K E & P H I L I P S D C V o lt a g e O u tp u t t o D F T T 7 0 0 1 /p in 1 1 c h 1 : f r e q = 3 1 .
  • Page 118 Dynamic Focus 2 – Location P M 3 3 9 4 , F L U K E & P H I L I P S c h 2 : p k p k = 3 . 3 6 V c h 3 : p k p k = 6 . 1 1 V This second half of the dynamic focus circuitry stage consists of several parts: 1.
  • Page 120 Summary W a v e f o r m D F g - S i g n a l A m p l if ic a t i o n N a m e L o c a t io n V o lt a g e / d iv The following waveforms show the operation of the entire stage from pulse C h a n n e l 1...
  • Page 122 Dynamic Quadrapole Focus Field There are three types of electron beam focus circuits used in this flat screen TV: – Static focus A DC voltage is applied to the picture tube’s focus grid. Beam This produces a line of focus points forming an arc pivoting at the yoke where the beam is swept.
  • Page 124 The first scope shot shows the parabola 1 signal processing from its be- DQP Magnetic field Drive ginning at IC1604/pin 4 (ch 1) to the QP coils (ch 3) The Dynamic Quadrapole correction signals were provide by parabola 1 P M 3 3 9 4 , F L U K E & P H I L I P S and 2.
  • Page 126 Appendix Heartbeat LED Set-Back Box (flashing red) Power-on LED (solid red) DTV-98 Board Front-end board Error LED Power (red when lit) Supply DTV Signal LED (green when lit) I/O Connector VHF/HUF Antenna Connector Power-on LED (red): Lit whenever SBB is powered on. Heartbeat LED (red): Flashes at a steady rate when unit is powered on;...
  • Page 127 Using LEDs inside the Set-back Box (“SBB”) as The two LED’s on the front-end board may be clear in color when they are not lit, but when lit, one will be red and the other will be green. When the troubleshooting tools.

  • Page 129: Board Replacement

    Board Replacement Board Removal Functions Possible Failure Symptom(s) After board replacement Input Video & DVD 1. Loss of color, or luminance (B & V boards also May have to program TV stations in The A board is plugged into switching, Y/C separation, possible).
  • Page 130 Channel and picture size 1. No VHF/Cable channel memory (no channel up/down Transplant memory IC1304 in an anti - The M board is held down memory, Picture width function). static atmosphere or load default data with two screws. control, H & V oscillator, 2.
  • Page 131 C 2 1 0 1 - 3 P i x M a s k i n g / C r o p p i n g P r o c e s s o r Service Mode Display I C 3 0 0 5 C 2 1 0 1 - 4 C o n t r a s t , b r i g h t , c o l o r ( m a i n a n d D T V ) P r o c e s s o r I C 3 0 0 5...
  • Page 132 Adjustment Data by Geometry C 2 1 0 1 - 1 N o r m a l, H D - D T V , a n d t h e 5 o t h e r s . Some registers contain data that is stored in a single memory location. C 2 1 0 1 - 2 H D - D T V , a n d t h e 6 o t h e r s Other registers have multiple memory locations.

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