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Sony D98 chassis Operation Manual
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Sony D98 chassis Operation Manual

Sony D98 chassis Operation Manual

Trinitron color computer display, d98 chassis
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OPERATION MANUAL
TROUBLESHOOTING MANUAL
MICROFILM

TABLE OF CONTENTS

D Board (Power Supply Section) ........................
D Board (Deflection Section) ..............................
A Board ...............................................................
N Board ..............................................................
GENERAL TROUBLESHOOTING .........................
PARTS LEVEL BOARD REPAIR ...........................
TRINITRON
®
D98
COLOR COMPUTER DISPLAY
-
1
-
CHASSIS
2
10
22
28
30
41

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Summary of Contents for Sony D98 chassis

  • Page 1: Table Of Contents

    CHASSIS OPERATION MANUAL TROUBLESHOOTING MANUAL TABLE OF CONTENTS CIRCUIT DESCRIPTION D Board (Power Supply Section) ......D Board (Deflection Section) ......A Board ............... N Board .............. GENERAL TROUBLESHOOTING ......PARTS LEVEL BOARD REPAIR ......TRINITRON COLOR COMPUTER DISPLAY ® MICROFILM...

  • Page 2: Circuit Description

    CIRCUIT DESCRIPTION D BOARD POWER SUPPLY SECTION Power Supply Electrical Circuit The power supply is located on the D Board. It has three modes of operation that are controlled by a microprocessor. The architecture is similar to discontinuous mode flyback converters and has photocoupler feedback for regulating the secondary voltages.
  • Page 3 AC input and Degauss CN601 THP602 VR601 RY601 D670 R672 Q670 R670 F601 R671 250V D601 LF602 CN600 C602 C604 C605 C601 C603 R603 C606 0.68 R601 TH600 R602 AC SWITCH 1. AC Input Section The AC input section provides EMI filtering, input protection, surge limiting and CRT degauss operation. An AC switch is also present for complete power off condition.
  • Page 4 Pin 2 – OCP - Over current protection. Used to determine the overload level at which the timer latch is activated. Pin 3 – CF – Oscillator. With a capacitor, determines the switching frequencies. (On/Off times.) Pin 4 - CLM - Over current protection. If the voltage on this pin (primary current feedback) exceeds -0.18V, the power supply will enter cycle-by-cycle current limit mode.

  • Page 5: Feedback Circuit

    D656 T601 -16V D653 -16V D654 PROTECTOR To IC604 D615 D655 D652 C619 R615 D651 From D601 D650 180V D633 To IC502 Pin 3 Q602 D649 Q657 IC603 To HDY- D605 D603 D648 R609 SHUTDOWN R608 R660 IC501 IC652 Pin5 D632 D631 R663...
  • Page 6 Feedback Circuits IC605 TDA8138A IC604 PQ6RD83B C662 D607 Heater C623 Regulator C634 C635 Heater Q601 D610 R617 REMOTE ON/OFF +5V BACK UP +16V D618 R666 R635 R637 R636 Heater ON/OFF D619 Q606 Q607 R638 C636 When remote on/off is set high, Q656 is turned on and Q658 is turned off; this disables active off and suspend modes regulation loop.
  • Page 7 normal operation, the VCC voltage is 17.5 volts. In the event the regulation loop was open or the control loop fails, the output voltages would rise rapidly. Likewise VCC will rise and when the threshold voltage is reached, IC601 would latch up. This condition disables the output circuit at pin 6 and the power supply will not operate.
  • Page 8 6. Troubleshooting Warning Before attempting to fix the power supply, safety should be consider first. Never connect test probes to the primary side circuits, unless proper isolation has been installed. If isolation for the AC mains is not present, serious harm can occur. Never assume you are safe.
  • Page 9 Horizontal Centering Loss of horizontal center adjustment can be affected by the rectifier diodes, fusible resistors, IC502 and related circuitry. Measure the voltages in reference to the horizontal centering ground. Typically, the voltages are ±8 volts. However, the adjustment setting can reduce the voltages by 1 volt. If there are no problems found with the diodes or fusible resistors, the next step is to check the adjustment signal at Q517.

  • Page 10: D Board Deflection Section

    D BOARD DEFLECTION SECTION 1. Horizontal Deflection Circuit Overview These circuit drive the DY(Deflection Yoke) for Horizontal Deflection. The H size and H shape control (IC805 and around) is included in this page as well. H Drive, H Out, Feedback HD pulse supplied from N board is inverted by Q501 and switch Q504 through Q502,503.
  • Page 11 H Deflection Circuit R517 R518 180V H Def H Reg L501 PWM IC805 H SHAPE H SHAPE D503 Q518 H Lin and R512 Q506 Ringing Circuit B+CHOP R813 HDY- D505 HDY- T502 T501 HDT H DY+ T504 H DY+ CN801 H FBP Q502 TO CN801...
  • Page 12 2. H Linearity and Raster/Distortion Ringing Correction Circuit This section includes HLC Control circuit which is new in D98, S cap switching and HLC/S-Cap Damping circuits. These circuits are placed directly on the “cool side” of DY which is in series with deflection current line. H Centering circuit will be explained in next section.
  • Page 13 DEFLECTION CIRCUIT R520 C528 330p CENTERING CIRCUIT L502 :HLC C515 C520 C519 C518 C514 C522 C521 L505 L504 0.68 R523 0.17 0.033 0.068 0.15 0.33 2.2mH 10mH 250V 250V 400V 400V 250V 250V 250V 1/2W :FPRD R522 Q509 Q511 Q510 R530 R525 Q513...
  • Page 14 C656 FROM D648 P.S. R545 C538 FROM PIN# T601 D511 FROM D649 A.S. R549 C657 R550 R546 IC502 R548 R551 DY(+) Q515 L503 (DRAIN Q506) Q517 R547 CENT C545 R541 R542 R815 Q516 STBY SW DY(-) REMOTE ON/OFF R552 Q802 !!! IMPORTANT CENTER VOLTAGE...
  • Page 15 Rotation/Vertical Key Circuit R735 +16V R736 D.TILT IC702 IC1002(DSP) R737 Rotation Coil(CN702) R709 R775 R729 V+ + ROTATION C701 C705 R707 IC1001 R708 N-BOARD -16V C702 4. Rotation/Vertical Key Circuitry Mounted on the D/N Boards) Circuit Theory of Operation The Rotation/Vertical Key circuitry takes its input from the N-board via pins 40 (Rotation) and 42 (D.Tilt). D. (Dynamic) TILT is generated by the DSP (IC1002) while Rotation is generated by the microprocessor (IC1001).

  • Page 16: Dynamic Focus Circuit

    Signal tracing should begin at pin 59 of IC1002 on the N board. The triangular output waveform at this point should change +/-1 vdc by operating V.TrapSawBtm and V.TrapSawTop registers through function through min-max extremes. This same signal should appear at pin 42 of CN801 and at the input side of R736. Screen movement for this function is as shown below: 1.5mm 1.5mm V.TRAPTOP...
  • Page 17 Dynamic Focus Circuit +16V R734 R733 C707 R738 IC703 FROM BOARD PIN# C728 R742 R754 T701 :DFT C714 -16V D905 R917 300V C931 +16V R723 R727 PIN# R909 Q706 FROM BOARD C711 Q707 R724 6. High Voltage Protect Circuit This circuit generates the High Voltage supply for the anode and G2 (1000V) of the CRT. It consists of a high voltage driver and regulator similar to a switching power supply function.
  • Page 18 Troubleshooting Hints See attached FLOW CHART to confirm if is really an HV/Protect Circuit issue. No HV / No Power Perform basic checks of Q901 and Q902 first. If both Q901 and Q902 were not broken, check the HV Drive pulse at the gate of Q901.
  • Page 19 CRT VIA 300V D908 D905 R811 C934 R921 R917 HV DET PIN# 24 BLK FV LEAD CN801 R922 C931 C802 R812 C801 D909 R913 D904 C930 C929 R914 R915 ABL DET PIN# 1 CN801 BOARD C919 19 D98 CHASSIS HV/PROTECTOR CIRCUIT...

  • Page 20: Troubleshooting Hints

    8. Vertical Deflection (D/N Boards) Circuit Theory of Operation The Vertical Deflection block takes its input from the N-board via pins 13 (VSAWN) and 15 (DCC2). These two signals are generated by the DSP (IC1002) and are both centered on 1.5V. VSAWN is a sawtooth waveform that controls VSIZE. DCC2 is a DC reference that is compared to VSAWN at IC401.
  • Page 21 +16V C403 D401 IC401 C404 Flyback Generator R1036 VSAWN IC1007/1A TDA8177 R1042 R409 R1053 R1061 C1010 V-DY througt CN510 LVDY R401 C402 IC1002(DSP) R1081 R1068 R410 R1052 -16V DCC2 R402 IC1007/2A C401 R404 C1009 C406 R1054 N-BOARD R1082 R403 R405 D-BOARD...
  • Page 22 Front input DDC2Bi to N Board 19 D98 Chassis A board Block Diagram VIDEO "A" BOARD ELECTRICAL CIRCUIT The main function of the A Board is to receive incoming video signals and process them into the RGB video drives necessary for the CRT cathodes.
  • Page 23 3) G2 and Beam Current Sensing Functions - Amplifies setup levels provided by Preamplifier A/D outputs for G2 control. - Beam Current Feedback (BCF) sensing for Color Restoration function. 4) Display Data Channel Interface - DDC2Bi - DDC2B 1. RGB Signal Processing (A Board) RGB Signal Select The Video and Sync inputs from the rear D sub and front input connectors are applied to the inputs of IC008.

  • Page 24: On Screen Display Functions

    clamped by discharging C106 via D106. The Green and Blue cathode Cutoff levels are clamped in a similar fashion. The individual cathode cutoff levels are set for white balance by the Microprocessor via I2C communication with IC001. Troubleshooting Hints 1) If the screen is blank with no output check: - Video signals with proper cutoff levels are provided to the CRT cathodes.
  • Page 25 Active +12V +80V Video IC003 From Cutoff D104 IC001 Control C106 D/A from C206 C306 IC001 Green Measurement Video Blue Driver Beam Current Measurement From N Timing Cutoff Circuit Board D106 Analysis Beam Current Same as R D206 R119 channel R107 D306 R120...
  • Page 26 Beam Current Sensing Circuit D104 C106 C206 C306 D105 Video Driver Range 400V-800V G2 Control Circuit Range 1V-4V R064 R048 Cutoff Control Cutoff Circuit Green D/A from D106 Blue IC001 D206 R119 R107 D306 R120 R316 R219 C105 R105 IC004 R320 R053 R220...
  • Page 27 DDC Data format and VGA Connector Allocations Basic EDID consist of 128 bytes 15 pin VGA type connector Number Description Pin No Assignment Pin No Assignment 8 Bytes Header RED Video Option 10 Bytes Vender/Product Identification GREEN Video Data(SDA) 2 Bytes EDID Version/Revision BLUE Video H SYNC...
  • Page 28 N BOARD SYNC AND CONTROL CIRCUITS Overview The N board performs H and V Sync processing within the Microprocessor (IC1001)and DSP (IC1002 Digital Signal Processor) which generates shaping, centering, deflection drive pulse and other corrections. The DSP is controlled by the Microprocessor using I2C BUS with the Microprocessor having an external EEP ROM.

  • Page 29: A Board

    System Block Diagram IN VIDEO X2 RGB VIDEO IN SYNC X2 DISPLAY DATA COMMUNICATION BUS VIDEO BLOCK (DDC) FOCUS/G2 HEATER A-BOARD ASC Measurement DC POWER MAIN POWER SW Sync C-BUS STATIC/ FOCUS DYNAMIC BLOCK Deflection FOCUS POWER SUPPLY PS Mode D.CONV H &...

  • Page 30: General Troubleshooting

    GENERAL TROUBLESHOOTING Input crosshatch signal at prime Mode 94KHz X 70 Hz No Picture Missing Color or Abnormal Color Visible Retrace or Visible Raster Mis-convergence Poor Focus Unsynchronized Image Abnormal Geometry Abnormal Image Size Shutdown No Communication...

  • Page 31: No Picture

    NO PICTURE Is amber Power LED Blinking? (See Part Level Board Repair Section) amber LED steady on? Check the video cable connection or INPUT SELECT registers Repair Video circuit Is green power LED On? Is Monitor beeping? (Small) or repair H deflection Press power switch, if LED does no turn on, repair"power supply"...

  • Page 32: Missing Color

    MISSING COLOR Are proper video levels present Check signal generator & cable on CN307,on313 pin 2, 4 &6? Is amber Power LED Blinking? (See Parts Level Board Repair Section) (See Parts Level Board Repair Section)
  • Page 33 VISIBLE RETRACE Check white balance adjustment and check "H Blank" register value. Check IC004, IC005,G2 Is G2 voltage correct? control circuit. IC001 pin 6 and FBT Check connections & blanking pulse present on pin18 signal at CN309 pin 1I of IC001 on A-Board? Is blanking pedestal present in the Check CN309 Pin 3...
  • Page 34 MISCONVERGENCE Reset and check, Try adjusting convergence using front panel controls Try adjusting convergence Is the convergence Done using DAS now within spec? Is the convergence Check the convergence within spec ? circuit(IC701,704) Is the convergence Change DY and circuit(IC701,704) readjust convergence OK ? Repair &...

  • Page 35: Poor Focus

    POOR FOCUS Adjust focus VRs on FBT Age monitor and Improved check for focus focus? change Check focus leads from FBT to CRT socket Check video bond CRT socket Is dynamic focus circuit OK ? (See Parts Level Board Repair section) Replace CRT and verify focus...

  • Page 36: Unsynchronized Image

    UNSYNCHRONIZED IMAGE Check input signals CN307 or CN313 pins 4,8 and 9 Check video Signals levels cable correct? Check sync Signals at CN309 separation circuits pin 4, 5 or 7 on video board Check wire Signals at CN dressing and 306 pins1 and connection 2 OK?
  • Page 37 ABNORMAL GEOMETRIC DISTORTION Down load factory settings and readjust Does distortion change Is geometric a lot when changing to distortion OK? inverse pattern (See Parts Level Board Repair Section) Done Identify distortion problem and repair (see board level repair) See"H Deflection circuit" "H Line/Ringing correction"...
  • Page 38 ABNORMAL IMAGE SIZE With user controls adjust picture size Does horizontal size adjustment? (See part level board Repair Section) Does vertical size adjustment ? (See part level board Repair Section) Adjust monitor Done...
  • Page 39 SHUT DOWN Check power Is amber supply LED blinking Check shut down log registers in IC1001 and Repair refering to the explanation of "Shut down"...
  • Page 40 NO COMMUNICATION Are connections Check connections to monitor OK? Check connect settings Are computer settings and and connections connections OK? Is 5 volts present Check Power supply at CN801 pin 43? Check N board Done...

  • Page 41: Parts Level Board Repair

    PARTS LEVEL BOARD REPAIR Parts Level Board Repair (1) Power Supply (2) Horizontal Delection (3) High Voltage (4) Vertical Deflection (5) Horizontal Size (6) Horizontal Center (7) Key and Pin (8) Key and Pin Balance (9) Rotation (10) N board (11) Dynamic Focus (12) Video (13) Convergence...

  • Page 42: Power Supply

    POWER SUPPLY Check F601 and D601 Does power Check Q505,506,901, supply make 902 and video board chirping noise? Check IC701,703,704,604,601,504 Does Power supply R617 try to start? Replace Q602, Check D603,615 Q602 OK? R609,615,IC601 Are D603,615 Replace parts, R609,615 verify voltage IC601 OK? Replace IC605,IC805 Check secondary diodes,...

  • Page 43: Horizontal Deflection

    HORIZONTAL DEFLECTION Is CN801 pin 26 N board output OK? (HD OUT) Change Q502,503 Q502 emitter out put OK? Check Q504, Change Is Q504 Gate & R504 input OK? IC805 Check Q506,D503 Is Q506 drain Change and R512 output OK? IC805 Check R507,Q504 Is Q504 drain...

  • Page 44: High Voltage

    HIGH VOLTAGE Is Q902,901 Replace Q902,901and D901 Check R910,D901 and Is Q901 gate change IC805 input OK? Check R911 Is Q902 gate and replace IC805 input OK? Is soldering or Resolder, mount if necessary around RV904,C926 are OK? Change FBT,verify operation and adjust monitor Done...

  • Page 45: Vertical Deflection

    VERTICAL DEFLECTION Is +15V and Check power supply -15V OK? Is CN801 Check N board pin13(VSAW)and pin15(VREF) waveform OK? Replace IC401 and check R401 Is (-)side of C403 showing 30vp-p R407,D405 pulse? Replace, if necessary Change DY Adjust monitor Done...

  • Page 46: Horizontal Size

    HORIZONTAL SIZE Check T504 and IC805or Is horizontal size the only problem ? N board Replace IC805 and check N board Distortion a problem ? Vertical size Check HV Repair Is H.linearity H-Lin/Ringing Correction circuit Replace DY and readjust Done...

  • Page 47: Horizontal Center

    HORIZONTAL CENTER Check landing and if it is OK, Is Raster center OK ? Check H centering circuit Is blanking pulse (CN309 pin1) OK ? Check Q514 Is Q514 emitter and D506 output OK? Check N board...

  • Page 48: Key And Pin

    KEY AND PIN Check N CN801 pin27 board outputs normal? Check Power Is B+ voltage supply Check T504,IC805 and related components Done...

  • Page 49: Key And Pin Balance

    KEY AND PIN BALANCE Check Rotation Rotation OK? circuit/adjustment Check N board...
  • Page 50 ROTATION Check N CN801 board pin40 OK? Connect CN702 properly CN702 connected? Replace IC702 pin4 IC702 output OK? Check RV709 FPRD Replace Done...
  • Page 51 N BOARD Check the connection between D and N board Check soldering 3.3V+/-0.1V of IC1006 present on +side of or Replace C1014? C BUS LINE Check (CN1003 pin5,7) IC1001,1005 has plus communication ? Check for solder bridge, crack or any mount mistakes Change N board...

  • Page 52: Dynamic Focus

    DYNAMIC FOCUS Check Focus leads are not reversed Is CN801 pin 33 Check N board output normal?* (V.Focus) * Should be less than 1.6vp-p Replace IC703 and R742 IC703 pin 6 output normal? Replace T701,Q706 FBT pin14,15 waveform OK? Change FBT Done...
  • Page 53 VIDEO - A BOARD Check connector Check if I C bus CN309 pins and IC003 (CN309 pin6.8) Check IC001 Check and IC003 IC001 pins 20 24 and 27 Check Replace parts IC002 pin 1,3, & Verify and 5 OK? Are cathode Check IC004 DC levels and and +B...
  • Page 54 CONVERGENCE Correct harness Check if harness for and change IC704 CN701 is not R718, 750 switched at DY connection Change to Convergence SW Check "CONV SW" Register to 3 registers readjust as required. Check all RS resistors Still No Good Change IC701, 704 Readjust and...
  • Page 55 NOTES:...
  • Page 56 Sony Corporation English Sony Technology Center 99AJ74253-1 Product Quality Division Printed in U.S.A. © 1999.1 9-978-848-01 Service Promotion Department...

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