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Training Manual
®
Computer Monitor
F99 Chassis
CPD-G400
Circuit Description and Troubleshooting
Course: MON-04

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Table of Contents

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   Summary of Contents for Sony CPD-G400

  • Page 1 Training Manual ® Computer Monitor F99 Chassis CPD-G400 Circuit Description and Troubleshooting Course: MON-04...
  • Page 2 Sony Service Company A Division of Sony Electronics Inc ©1999 All Rights Reserved Printed in U.S.A. S is a trademark of Sony Electronics...
  • Page 3 Circuit Description and Troubleshooting: Model: CPD-G400/F99 Chassis Prepared by: National Training Department Sony Service Company A Division of Sony Electronics Inc. Course presented by _____________________________________ Date___________________________________________________ Student Name ___________________________________________...
  • Page 4 SEL Service Company A Division of Sony Electronics Inc. 1 Sony Drive Park Ridge, New Jersey 07656 MON040200 Printed in U.S.A.
  • Page 5: Table Of Contents

    Table of Contents Sony Monitor Model CPD-G400 Specifications 1 AC Input Degaussing Circuit Normal Operation / Features Surge Protection Circuit Power ON Operating Voltages and Resistances Power OFF Switching Oscillator Aging Mode Start Up - Normal Mode Lock control Active off Mode...
  • Page 6 Appendix Circuit Voltages Sync / Deflection Block Power MOSFET Tests CPU IC1001 & DPU IC801 IIC or I C Bus Horiz / Vert Oscillator Data Format Vertical Output Plug and Play Horizontal Output Monitor Problems Checklist High Voltage LCD Concept HV Manufacture Service Position viii...
  • Page 7: Sony Monitor Model Cpd-g400 Specifications

    Sony Monitor Model CDP-G400 Specifications Trinitron Power Saving 0.24 mm aperture grill (fine) pitch 4 Power Modes (3 power saving): Normal – 140Watts Picture Tube 19 inches measured diagonally Standby – 15 Watts 90 degree deflection (low distortion) Suspend (Sleep) – 15 Watts Active Off –...
  • Page 8 NOTES...
  • Page 9: Normal Operation / Features

    Aging Mode INFORMATION This mode is commonly found in Sony monitors and warms up the CRT in NO INPUT SIGNAL preparation for the technician to perform color temperature adjustments. By pressing a series of front panel buttons (different for each model), this INPUT 1 mode can be activated.
  • Page 10: Lock Control

    Image Restoration Moiré Adjustment This circuit is operated by the customer to automatically white balance When fine lines are viewed though other fine lines, additional patterns are the picture. This is achieved by adjusting the RGB drive (signal) levels to developed when the lines do not coincide.
  • Page 11: Overall Block

    The deflection block consists mainly of the oscillator, the vertical and the horizontal deflection stages. These stages generate the signal required The overall block diagram shows the major sections of the Sony model to make the magnetic field in order to move the electron beams across CPD-G400 monitor that house a F99 chassis.
  • Page 12 G2 CONTROL RGB 1 IC001 IC008 IC002 INPUT PRE-AMP SEL. RGB 2 FOCUS S2001 IC004 IC003 IC009 CUT-OFF SYNC CONT. SYNC 2 SEL. SW. A BD. 11C DATA/CLK A BD. GRN/ORG D BD. D BD. SYNC D FOCUS STBY T901 IC1001 IC901, Q902 IC1603, Q605...
  • Page 13: High Voltage

    Video Processing Block Deflection Support Stages Stage Parts Function Stage Parts Function Input Switch IC008 RGB input switch Dynamic IC1001 Oscillator signal for beam location Focus IC801 Signal shaping IC009 Sync input switch Q701-5, Horizontal dynamic focus amp. RGB Amp IC001 Preamp of the input signal IC503, Q706.
  • Page 14 G2 CONTROL RGB 1 IC001 IC008 IC002 INPUT PRE-AMP SEL. RGB 2 FOCUS S2001 IC004 IC003 IC009 CUT-OFF SYNC CONT. SYNC 2 SEL. SW. A BD. 11C DATA/CLK A BD. GRN/ORG D BD. D BD. SYNC D FOCUS STBY T901 IC1001 IC901, Q902 IC1603, Q605...
  • Page 15: Power Saving Modes

    the orange LED to also turn ON. Both LED on means the monitor is in the Power Saving Modes Suspended Power Mode. Active OFF Power Mode This monitor has four power modes. The CPU monitors video input sync A loss of both horizontal and vertical sync causes the monitor to enter a to select the monitor’s power mode of operation.
  • Page 16 POWER SUPPLY 5V/12V REG. BURST MODE REMOTE INPUT 1/2 ON/OFF SEL SW. HEATER S2001 ORG. LED 2 D2001 STBY LED 1 GRN. IC1001 FROM INPUT 1 IC009 INPUT SYNC FROM INPUT 2 STANDBY 5V 1/19/00 5MON04 1205 POWER SAVING CIRCUIT...
  • Page 17: Power Mode Circuit Activity

    Power Mode Circuit Activity The front panel combination green/orange LED identifies the lack of H or V sync input. The monitor power operating modes relating to the circuitry is summarized this chart: Monitor Mode Details Power Mode Power AC Power Video Main Surge Resistor...
  • Page 18 +15V D619 POWER SURGE SUPPLY RELAY D621 IC609 RY602 STBY D2001 BURST STBY +200V MODE D620 IC605 31 11 +5V REG LED 1 LED 2 D616 IC610 H SYNC +5V REG FROM SYNC HEATER V SYNC Q606 VOLTAGE C SYNC IC1001 HEATER IC009...
  • Page 19: Power Supply Block

    Power Supply Output Power Supply Block This power supply has outputs that are fused and unfused: The power supply develops various voltages required by the monitor. The Fused Switching Power Supply Outputs CPU works with the switching power supply to enter a very low (energy Voltage Fusible Resistor Destination...
  • Page 20 D625 F601 R649 TH600 DC BIAS TO H.YOKE IC502, Q519 H.CENT. PWM3 SURGE R650 IC1001/4 +15V CIRCUIT Q607 +200V DEGAUSS IC603, T602, Q605 R648 CIRCUIT SWITCHING +80V IC610 POWER SUPPLY HEATER COIL R647 REG. PWM 2 IC604 R645 REG. C628 SERIAL +12V 2,200...
  • Page 21 Active Off Mode Entry Although a failure in any one of these circuits can trigger the Active Off Power Mode, the CPU will indicate the defective circuit using the front SCR device D616 starts the Active Off Power Mode. The 200V and 8V panel LED.
  • Page 22 D625 F601 R649 TH600 DC BIAS TO H.YOKE IC502, Q519 H.CENT. PWM3 SURGE R650 IC1001/4 +15V CIRCUIT Q607 +200V DEGAUSS IC603, T602, Q605 R648 CIRCUIT +80V SWITCHING IC610 POWER SUPPLY HEATER R647 COIL REG. PWM 2 IC604 R645 REG. C628 SERIAL +12V 2,200...
  • Page 23: Degaussing/surge Protection

    turing (damaging) semiconductors in the monitor. The VDR returns to Degaussing/Surge Protection infinite resistance when the applied voltage disappears. VDRs will not shunt a high-energy pulse from a direct lightning hit on the power line. AC Input Hopefully the VDR will short and take out the fuse, saving other parts within the monitor.
  • Page 24 Q608 DIGITAL TRANSISTOR D628 RY601 DEGAUSS PWM2 R675 IC001/5 TH601 ON/OFF COIL F601 C636 LF602 S601 R604 6.3A 470pF R625 2.2 OHMS +158V 0.1 OHM R674 C637 TO IC603/1 560k TH600 470pF SRT T602/9 C611 R605 D605 VA601 2.7 OHMS +15V RY602 R671...
  • Page 25: Surge Protection Circuit

    Circuit Operation The sequence of operation is as follows: Degassing only occurs after the front panel power is pressed. The se- 1. Power ON button is pressed. quence of operation is as follows: 2. Heavy current goes to the degaussing circuit. 3.
  • Page 26 Q608 DIGITAL TRANSISTOR D628 RY601 DEGAUSS PWM2 R675 IC001/5 TH601 ON/OFF COIL F601 C636 LF602 S601 R604 6.3A 470pF R625 2.2 OHMS +158V 0.1 OHM R674 C637 TO IC603/1 560k TH600 470pF SRT T602/9 C611 R605 D605 VA601 2.7 OHMS +15V RY602 R671...
  • Page 27: Switching Oscillator

    1. Switching Regulator IC603/pin 14 receives a voltage above 2.5V. Switching Oscillator IC603/pin 14 is labeled OOD for “On/Off Data”. 2. Voltage input from IC603/pin 1 is permitted to leave Vaux IC603/pin 6 This switching oscillator stage generates seven voltages for the monitor to charge external capacitor C613 until IC603’s oscillator runs.
  • Page 28 D614 158V +200V TO 5V L608 R625 R626 D618 REGS. C612 +80V 47k, R693 R627 D609 R645 D619 4.7M 4.7M Q605 D620 +15V 2SK3265 C610 TO 12V REG. R636 C617 5.6V R647 R628 D612 IC603 D622 560k R629 D611 SW REG. 820k CONT -15V...
  • Page 29: Active Off Mode

    Active off Mode Active Off Power Supply Burst Name Location Voltage The monitor can also operate in an Active Off mode. When the computer is turned OFF, there is no video sync input the monitor. Within the moni- Channel 1 Amplified Osc Q605/D 180Vp-p...
  • Page 30 D614 158V +200V TO 5V L608 R625 R626 D618 REGS. C612 +80V 47k, R693 R627 D609 R645 D619 4.7M 4.7M Q605 D620 +15V 2SK3265 C610 TO 12V REG. R636 C617 5.6V R647 R628 D612 IC603 D622 560k R629 D611 SW REG. 820k CONT -15V...
  • Page 31: Mode Switching

    Mode Switching Power Supply Output Voltages By using three operating modes to maintain the output voltages, the power Line @ Location Normal/Light Mode Active Off Mode supply is more efficient. The correct operating mode is selected by IC603/ 200V @ D614/C 200V 16.5V pin 14 for the Active Off Mode and maintained by using feedback from...
  • Page 32 D614 158V +200V TO 5V L608 R625 R626 D618 REGS. C612 +80V 47k, R693 R627 D609 D619 4.7M R645 4.7M Q605 D620 +15V 2SK3265 C610 TO 12V REG. R636 C617 5.6V R647 R628 D612 IC603 D622 560k R629 D611 SW REG. 820k CONT -15V...
  • Page 33 6. Apply external +5Vdc in series with a diode to IC605/pin 1. This turns The procedure is as follows: ON 5V regulator IC605 and 12V regulator IC604. You may want to 1. Position the main board to access the power supply. You will not place a diode in series with the external +5V power supply to prevent need the picture tube nor degaussing coil.
  • Page 34 D614 158V +200V TO 5V L608 R625 R626 D618 REGS. C612 +80V 47k, R693 R627 D609 D619 4.7M R645 4.7M Q605 D620 +15V 2SK3265 C610 TO 12V REG. R636 C617 5.6V R647 R628 D612 IC603 D622 560k R629 D611 SW REG. 820k CONT -15V...
  • Page 35: Switching Oscillator Part Functions

    Switching Oscillator Part Functions Power Supply Parts Functions Defective Parts Purpose of Parts Possible symptoms D609, C612, Q605 Protection Immediate Q605 failure C610, C617, D611, Q605 Protection Intermittent Q605 C619. failure R640, R641 Q605 Protection Power supply oscillator stops R630 open (no error Error detection circuit Power supply cycles signal),...
  • Page 36 D614 158V +200V TO 5V L608 R625 R626 D618 REGS. C612 +80V 47k, R693 R627 D609 D619 4.7M R645 4.7M Q605 D620 +15V 2SK3265 C610 TO 12V REG. R636 C617 5.6V R647 R628 D612 IC603 D622 560k R629 D611 SW REG. 820k CONT -15V...
  • Page 37: Low Voltage Regulating Circuit

    Regulator Operation - Normal Mode Low Voltage Regulating Circuit Regulation is performed by predominately IC608 in the normal, standby and suspended power modes. The voltage from a secondary winding of Although the switching power supply oscillator runs while there is voltage T602 at D621 is used for regulation.
  • Page 38 IC603,Q605 SWITCHING D614 200V C650 POWER DRIVE (SOURCE) SUPPLY T602 V CTRL D621 D615 R653 VAUX DEM D608 D633 FDBK R630 R667 R677 D616 47k2W 3.4V R602 Q606 0 OHM R657 STBY REG CIRCUIT HEATER D630- 6.9V Q609 FROM D617 IC1001/8 C608 R685 R684...
  • Page 39: Measured Voltages

    One Oscillator Burst Regulator Operation - Active Off Mode Name Location Voltage In the active off mode, only the standby 5V is operational. Q609, IC607 Channel 1 Amplified Osc Q605/D 180Vp-p and IC609 are used to maintain standby 5V for the CPU. CPU IC1001 Channel 2 Oscillator Output IC603/pin 4...
  • Page 40 IC603,Q605 SWITCHING D614 200V C650 POWER DRIVE (SOURCE) SUPPLY T602 V CTRL D621 D615 R653 VAUX DEM D608 D633 FDBK R630 R667 R677 D616 47k2W 3.4V R602 Q606 0 OHM R657 STBY REG CIRCUIT HEATER D630- 6.9V Q609 FROM D617 IC1001/8 C608 R685 R684...
  • Page 41: Simulated Defects And Symptoms

    1 (in) Green LED is CPU is functioning Test D616 (short) and Q606 in the Normal (open) or pull D616 out of D616 2 (gnd) Power Mode but circuit to see if the Normal Only the standby IC607 the power supply is mode is possible.
  • Page 42 IC603,Q605 SWITCHING D614 200V C650 POWER DRIVE (SOURCE) SUPPLY T602 V CTRL D621 D615 R653 VAUX DEM D608 D633 FDBK R630 R667 R677 D616 47k2W 3.4V R602 Q606 0 OHM R657 STBY REG CIRCUIT HEATER D630- 6.9V Q609 FROM D617 IC1001/8 C608 R685 R684...
  • Page 43: Video Block

    RGB Signal Process Blockage Location Reason for blockage Check for Two computers can be connected to the CPD-G400 monitor. A front IC008 Input Switch Input not selected. Slide front panel input panel switch selects the input used. The switch signal is applied to IC008, switch to correct position which selects the RGB signal.
  • Page 44 G2 CONTROL RGB 1 IC008 IC001 IC002 INPUT PRE-AMP. RGB 2 IN 1 S2001 IC004 INPUT SW. IN 2 A BD. IC003 IC009 CUT-OFF SYNC SYNC 1 SEL. SW. SYNC 2 TO DPU IC801 (N BD.) OSC. 11C DATA/CLK BUS DPU IC801 (N BD.) 11C DATA SYNC...
  • Page 45: Input

    Input Input Select Switch IC008 Name Input Output Location Level Location Level Input/Output Signals RGB input 1 Pins 2, 5, 7 1Vp-p Pins 27, 1Vp-p This monitor can be connected to two computers. A front panel switch 30, 35 selects input 1 or input 2. Each input is identical except for the Plug and RGB input 2 Pins 11, 13, 16 1Vp-p...
  • Page 46 6 24 31 36 CN313 C130 R OUT IC008 1Vp-p TO RGB INPUT INPUT 1 G OUT PRE-AMP SELECT IC001/10-13 C230 M52758FP B OUT CN310 C330 R2 G2 0.22 INPUT H BD. DDC DATA/CLK STBY +5V INPUTJACK TO CPU 1003/ No.2 ICIC1001/34,35 S2001...
  • Page 47: Video Output

    Video Output RGB Signal Path Signal input from computer Location Wave Shape IC001/pins 10-12 1.9V 1Vp-p Overview The video output stage consists of several ICs that: IC002/pins 8, 9 & 11. 2.8V 4Vp-p • Amplify the computer RGB signal; and IC002/pins 1, 3 &...
  • Page 48 R048 G2 CONTROL CIRCUIT D104 +12V +80V D105 D105 25 29 R OUT FROM IC002 IC001 C106 ,0.47 IC008/27,30,35 G OUT RGB OUT LM24026 C206 PRE-AMP B OUT MC13289 C306 11C FROM +12V +200V +200V IC1001/36,37 R106 D106 R122 R109 D BD.
  • Page 49 Part of IC001 serves as a D/A converter. The data from CPU IC1001/pin The OSD signal replaces the RGB video signal using the switch inside 26 is input IC001 to make the analog (background) cathode bias voltages RGB Preamp IC001. The switch is controlled by the Fblk signal from and the G2 voltage.
  • Page 50 R048 G2 CONTROL CIRCUIT D104 +12V +80V D105 D105 25 29 R OUT FROM IC002 IC001 C106 ,0.47 IC008/27,30,35 G OUT RGB OUT LM24026 C206 PRE-AMP B OUT MC13289 C306 11C FROM +12V +200V +200V IC1001/36,37 R106 D106 R122 R109 D BD.
  • Page 51 CRT Cathode current Measurement OSD (Menu) Makes menu, graphics and a white screen. All CRT cathode current must flow through IC004. A sample of this cur- IC003 Aging Performs image restore rent is represented by a signal at IC004/pins 10-12. Although this signal Ik image restore calculations.
  • Page 52 R048 G2 CONTROL CIRCUIT D104 +12V +80V D105 D105 25 29 R OUT FROM IC002 IC001 C106 ,0.47 G OUT IC008/27,30,35 RGB OUT LM24026 C206 PRE-AMP B OUT MC13289 C306 11C FROM +12V +200V +200V IC1001/36,37 R106 D106 R109 R122 D BD.
  • Page 53: G2 Control

    When the monitor is turned ON from a cold start, the CRT filaments take G2 Control a while to stabilize. As a result, the picture is not as bright as when they reach normal operating temperature and the monitor has stabilized. The CRT Brightness “G2 start”...
  • Page 54 R048 +12V +12V 2.2M +1kV A BOARD IC005 G2 CUT-OFF 660V R029 2.8V IC001 NJM2904M IC1005 100k PRE-AMP 24C16F C029 Q001 MC1328 Q006 9.1V R099 R050 R049 4.7M DATA/ R097 R045 START CLK BUS 2.2k +12V +12V R047 C095 C028 R098 R044 IC1001...
  • Page 55: Sync / Deflection Block

    a sample of fly back (FBT T901) voltage. The fly back causes the remain- Sync / Deflection Block der of the voltages for the CRT to operate. The CPU uses a sample of the HV voltage and ABL voltage (CRT current) from the FBT for protection. Several stages can be grouped together to provide the CRT with basic The CPU will latch the monitor into the low power mode when there is operating signals.
  • Page 56 H+V PROTECT HV PROTECT IC1001 SYNC SYNC ABL PROTECT (D BD.) 300V S2001 IC009 IN 1 T901 IC901, Q901 SYNC FOCUS SEL. SW. HV PROTECT (A BD.) DATA CLK SYNC0 ABL PROTECT IN 2 IC801 SYNC Q501-Q503 (N BD.) HD.Y Q504 H DRIVE H OUT...
  • Page 57: Horiz / Vert Oscillator

    Main H and V Sync Path Horiz / Vert Oscillator Horizontal and vertical sync entering the monitor are selected by switch IC009 and buffered by IC006. These signals pass from the input A board Oscillator Activity to the CPU at the front of the D deflection board under the picture tube CPU IC1001 houses the horizontal and vertical oscillator.
  • Page 58 STANDBY STANDBY IC006 (INVERTER) BUFFER TC74HCT04F V SYNC0 TO: V SYNC V OUT DPU IC801/42 IC009/14 N BD. OSD IC003/6 SYNC H OUT A BD. IC009/4 IC006 1/2 IC006 2/2 IC10012 CN309/ CDX9523S CN1002 STANDBY 4.1V R080 R078 C063 Q003 GREEN H SYNC TO: SYNC...
  • Page 59: Vertical Output

    Vertical Output IC1001 Inputs Outputs 1. V Sync (not required Oscillator output Vertical Stages IC1001 for an output) 5Vp-p The vertical stage consists of three ICs: 2. Standby +5V 3. 8Mhz Xtal IC Number Location Function 4. VFBP output Name signal for shutdown IC1001 Main D board...
  • Page 60 VFBP (PROT.) TO IC1001/42 D405 R417 D401 3.2V +15V R407 C409 D407 5.6V C403 3.3V IC802 D BD. 3.3V IC803 1/2 LM324 V SYNC O 28 52 39 IC803/4 TEST R801 IC1001/26 IC401 V IN D BD. R410 V OUT R830 IC801 DATA...
  • Page 61: Horizontal Output

    main sweep (H. drive) signal is processed, it passes through L/C (induc- Horizontal Output tors and capacitors) and the deflection yoke (H DY). Since the output of the L/C components in the drive path will change with frequency, com- Main Horizontal Drive Circuit pensation circuits are needed.
  • Page 62 HFBP TO: 1 OSD IC003/7 D BD. 2 CPU IC1001/32 L502 3 DPU IC801/29 -N BD. Q511-Q516 HDY+ CAP. SW. IC1001/46-50 HDY- H CENT. +12V CIRCUIT Q506 IC1001/4 +200V PIN OUT R511 Q507 T502 0.47 R519 OHMS R516 CN802/ D505 C509 H SYNC 0 CN1005...
  • Page 63: High Voltage

    PWM Signal High Voltage The PWM signal from IC901/pin 3 is used to control the high voltage from the T901 flyback transformer. IC901’s PWM output directly controls the Overview conduction time of switching MOSFET Q901. A LOW going pulse applied The purpose of this stage is to use the horizontal drive signal to manufac- to its gate turns on Q901.
  • Page 64 R934 T902 +200V Q901* R908 +12V HV SW. D BOARD IRF19634 * Q901,Q902 ARE 9V REF. SHOWN DIFFERENT C914 R911 THAN SERVICE 0.05 MANUAL 27kV +12V HV TO PIX OUTPUT T901 TUBE Q902* R926 H DRIVE Q903 R912 FS5KM Q501- N CH.
  • Page 65: Protection

    will increase the HV. This LOW going pulse is applied to switching 5. Without HV, IC901/pin 3 should be LOW except for a 2msec positive MOSFET Q901’s gate. The longer the LOW going pulse duration, the pulse. Pin 3 is LOW to try to increase the disabled HV. longer Q901 stays turned ON.
  • Page 66 R934 T902 +200V Q901* R908 +12V HV SW. D BOARD IRF19634 * Q901,Q902 ARE 9V REF. SHOWN DIFFERENT C914 R911 THAN SERVICE 0.05 MANUAL 27kV +12V HV TO PIX OUTPUT T901 TUBE Q902* R926 H DRIVE Q903 R912 FS5KM Q501- N CH.
  • Page 67: Dynamic Focus Concept

    Modern picture tube screens are flat to reduce annoying room glare. This Dynamic Focus Concept means the focus point must be moved up at the left and right sides to meet the flat picture tube screen. Static Focus Dynamic Focus An electron beam within the picture tube consists of many electrons that The job of the dynamic focus circuit is to change the focus points to meet are slowed down by the focus electrode.
  • Page 68 Notes...
  • Page 69: Dynamic Focus Circuit

    Dynamic Focus Circuit Amplifier Stage DC Voltages Emitter Base Collector Q701 0.6V 1.25V 23.2V The job of the dynamic focus circuit is to change the focus points to match the flat picture tube screen. This is done in the horizontal plane by in- Q702 24.5V 24.8V...
  • Page 70 T901 R753 10 OHMS +80V Q702 Q702 D BOARD Q704 R932 R930 R745 D701 4.7k R744 -D703 +12V R746 T701 R931 R740 CN802/ 4.7k Q703 VFBP CN1005/ N BOARD C720 Q701 Q705 CN1005 VOUT CN802 0.01 R741 IC401/7 R747 D BD. +300V R743 R742...
  • Page 71: Digital Convergence

    Convergence Output Waveform: Digital Convergence Circuitry Using data stored in the EEProm memory IC1005, DPU IC1701 manu- factures the static and dynamic convergence signals. All of the memory data is transferred to the CPU at power ON. The CPU then sends the data to pertinent ICs.
  • Page 72 -15V +15V CN701/CN11 N BOARD REF. IC701 CY AMP. LA6510 VFBP V OUT IC4012/7 D BD. IC801 HFBP CXD9517Q Q507/E D BD. IC702 CY AMP. REF. STK391 Y DC DATA CONVERGENCE R716 R717 YOKES CN802/ CN1005 -15V +15V IC1001 D BOARD 36,37 10MON04 1219 1 14 2000...
  • Page 73: Self Diagnostic Function

    Self Diagnostic Function The front panel combination green/orange LED is used to indicate the following: • Loss of input sync (see Power Saving Modes) • Failure in the High Voltage and Vertical Output Stages • Excessive ABL current (picture tube or drive failure) The following chart shows the LED indications and what level of voltage at CPU IC1001 will activate (enter) this protection mode.
  • Page 74 +15V D619 POWER SURGE SUPPLY RELAY D621 IC609 RY602 STBY D2001 BURST STBY +200V MODE D620 IC605 31 11 +5V REG LED 1 LED 2 D616 IC610 H SYNC +5V REG FROM SYNC HEATER V SYNC Q606 VOLTAGE C SYNC IC1001 HEATER IC009...
  • Page 75: Appendix

    APPENDIX...
  • Page 76: Power Mosfet Tests

    2. Touch the ohmmeter’s positive lead to the MOSFET’s gate terminal to Power MOSFET Tests charge it. 3. Quickly move the ohmmeter’s positive lead to the DRAIN terminal JEIA Transistor Classification and read the resistance. If the device is good you will initially measure a resistance of about 400 to Transistor types are identified in the Japanese Electronic Industry Asso- 1k ohms.
  • Page 77: Iic Or I 2 C Bus

    The Data Overview • Stop Bit In recent years Sony monitors, television and other Sony and non-Sony Data Structure consumer products have switched over to a communications bus that has more advantages than disadvantages. The major advantages are: Ack Data Ack Data...
  • Page 78: Plug And Play

    15 PIN HIGHDENSITY D-SUB FEMALE at the video card. Note: Direction is Computer relative Monitor. 15 PIN HIGHDENSITY D-SUB MALE at the monitor cable. Plug & Play Communications in Sony model CPD-G400 2 way DDC2B s SDA, w clk Video...
  • Page 79 What is Plug and Play Since the ACCESS.bus conveys information directly to your system, mice and keyboards as well as other compatible components can be Currently there are several levels of Plug and Play compliance. DDC1 plugged and unplugged without having to restart your computer. Espe- (Display Data Channel 1) capable monitors can communicate with the cially useful for monitors, the ACCESS.bus allows you to adjust your display adapter in only one direction through an unused line on the stan-...
  • Page 80: Monitor Problems Checklist

    • Filament voltage = 6Vdc or 6Vrms Monitor Problems Checklist • G, R or B voltage. Should be less than 200V to produce bright- ness. While involved with testing in one circuit, a related circuit can be over- • Focus voltage. A loss of focus voltage will not cause a dark screen, looked.
  • Page 81 4. Symptom – A color is too weak or bright. 8. Symptom – Intermittent cut-off control IC failure. The problem area can be in the DC bias voltage applied to the CRT cath- Arcing in the CRT can cause repetitive failure of this cut-off control IC and odes or in the RGB drive signal that is AC coupled to the CRT cathodes.
  • Page 82: Lcd Concept

    RGB Pixel Control LCD Concept There are various ways the pixels in an LCD panel can be controlled. In model CPD-L181, A/D Converters convert the analog RGB signal to digi- Basic Pixel Structure tal format. The pre-assembled LCD panel contains thousands of crystal- lized electro-chemical structures (one for each pixel).
  • Page 83: Service Position

    General Procedure: Service Position 1. Remove shielding to expose the area you need to test. Warning-When repairing any electronic product DO NOT PLUG THE 2. Leave the Degaussing coil, convergence yoke, rotation coil, and HV anode lead unplugged. PRODUCT DIRECTLY INTO AC. Plug the product into an isolation trans- 3.
  • Page 84: Full Operational Testing Position

    Full Operational Testing Position When the HV or the remainder of the protection circuits needs to be tested, the monitor must be fully powered. Hints and Tips • The D board shield must be removed for access to the D board from the foil side for troubleshooting.

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