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Toshiba TW40F80 manual Memory Circuit Check, No Indication On Screen

Models: TW40F80

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14-4. Memory Circuit Check

Memory circuit check

Voltage check at pin 8 of QA02 (5V).

OK	Check power circuit.

Pulse input at pins 5 and 6 of QA02

in memorizing operation.

Check QA01.

Replace QA02.

Note: Use replacement parts for QA02.

Adjust items of TV set adjustment.

14-5. No Indication On Screen

No indication on screen.

Check of RESET at 5V.

Check of CLK, CS, BUSY, DATA at

pin 22, 23, 24, 25 of QA01.

"H" = 5V or puls?

Check of character signal at pin 59, 60, 61

of QR60 (5V(p-p)).

Check V/C/D circuit.

Replace QA01 or QR60 or QR63.

Replace QA01 or QR60.

Replace QR60.

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Toshiba TW40F80 manual Memory Circuit Check, No Indication On Screen

Contents

TW40F80 PROJECTION TELEVISIONTECHNICAL TRAINING MANUAL N5SS CHASSIS 9. REMOTE CONTROL CODE ASSIGNMENT ContentsSECTION IV DVD SWITCH CIRCUIT SECTION II TUNER, IF/MTS/S. PRO MODULE4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS 5. TERMINAL FUNCTION, DESCRIPTION AND BLOCK DIAGRAM OF3. SYSTEM COMPONENT DIAGRAM OF DUAL UNIT SECTION VII 3-DIMENSION Y/C SEPARATOR CIRCUIT7. CONVERGENCE TROUBLESHOOTING CHART SECTION X DEFLECTION DISTORTION CORRECTION CIRCUIT1. DEFLECTION DISTORTION CORRECTION IC TA8859CP SECTION XI DIGITAL CONVERGENCE CIRCUITOUTLINE 2. MERITS OF BUS SYSTEM SECTION 1. FEATURE2-1. Improved Serviceability 2-2. Reduction of Parts CountC-Chassis 3. SPECIFICATIONSModel TW56F80 TW40F80Note No Owners manual page 4. FRONT VIEWIN-VIDEO 5. REAR VIEWTOSHIBA 6. REMOTE CONTROL VIEW6 DUAL 7. CHASSIS LAYOUT8. CONSTRUCTION OF CHASSIS A517BRT TBS 1-2. Major Features SECTION II TUNER, IF/MTS/S. PRO MODULE 1. CIRCUIT BLOCKFig. 2-1 Block diagram 1-1. OutlineSwitching Fig. 2-2 Block diagram of MVUS34S1-3. Audio Multiplex Demodulation Circuit Table 2-1 Matrix for broadcasting conditions and reception mode1-4. A.PRO Section Audio Processor Fig. 2-3 A.PRO block diagramMOTHER Configuration of the audio circuit and signal flow are given in FigVIDEO FRONT INPUT2-1. Outline 2. POP TUNERTerminal No NameSECTION III CHANNEL SELECTION CIRCUIT 1. OUTLINE OF CHANNEL SELECTION CIRCUIT SYSTEM2. OPERATION OF CHANNEL SELECTION CIRCUIT 3. MICROCOMPUTER 4. MICROCOMPUTER TERMINAL FUNCTION Terminal Name MICROCOMPUTER TERMINAL NAME AND OPERATION LOGICFunction In/Out6. ON SCREEN FUNCTION 5. EEPROM QA027. SYSTEM BLOCK DIAGRAM Fig. 3-6 Local key assignment Table 3-1 Local key assignment 8. LOCAL KEY DETECTION METHODFunction FunctionCode 9. REMOTE CONTROL CODE ASSIGNMENTFunction to TV setCode Custom codes are 40-BFH TV set for North U.S.AFunction Custom codes are 40-BFH TV set for North U.S.AOPT0 9-1. Optional Setting for Each ModelOPT1 MODELS10. ENTERING TO SERVICE MODE 11. TEST SIGNAL SELECTION12. SERVICE ADJUSTMENT 13-1. Contents to be Confirmed by Customer 13. FAILURE DIAGNOSIS PROCEDURE13-3-1. Procedure Contents of self diagnosis13-4. Understanding Self Diagnosis Indication ContentsExample of screen display SELF CHECK13-4-2. Method utilizing inner signal 13-4-1. Clearing method of self diagnosis resultVIDEO INPUT 1 terminal should be open 14-1. TV does Not Turned ON 14. TROUBLESHOOTING CHARTWhen remote unit key is pressed OK Replace QA01 Key on TV Voltage change at pins 17, 18 of QA01 5V to OK Replace QA01NG Check key-in circuit NG Check tuner power circuit No picture NG Voltage at pins of +5V, and OK14-5. No Indication On Screen 14-4. Memory Circuit CheckSECTION IV DVD SWITCH CIRCUIT 1. DVD SWITCH BLOCK DIAGRAM Open at Cb input Cb to DVD SW unit Cb input RV28 100k 2. OUTLINERV27 10k QV01 TA1218N2. CIRCUIT OPERATION SECTION V WAC CIRCUIT 1. OUTLINE2-1. Configuration 2-2-1. Signal FlowFig. 5-1 Wide aspect conversion unit block diagram PB6348 Pin Function Fig. 5-2 Pin function of TC9097F QFP 80 pinVDD5VCO2 Table 5-1 Names and functions of TC9097F NameFunction Function NameFig. 5-3 TC9097F system block diagram 3. BLOCK DIAGRAMName Function4. WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS PROCEDURES 4-2. Raster Horizontal One 4-2-1. Adjustment Method1. OUTLINE SECTION VI DUAL CIRCUIT2. PRINCIPLES OF OPERATION 9-screen multi-search process3. SYSTEM COMPONENT DIAGRAM OF DUAL UNIT 4-1. Video/Color/Deflection Process Section 4. CIRCUIT OPERATIONSignalreception Fig. 6-3 Sub screen process section 4-2. Sub Screen Process SectionFig. 6-4 Main/Sub screen superimposing section 4-3. Main/Sub Screen Superimposing Section5. TERMINAL FUNCTION, DESCRIPTION AND BLOCK DIAGRAM OF MAIN ICdiagram QY01Power supply video Fig. 6-6 QY01 mPC1832GT pin layoutBlanking pulse output MULTIPLEX Fig. 6-7 QY03 TC9092AF internal block diagramPROGRAMDATA MEMORYADVREFY Fig. 6-8 QY03 TC9092AF pin layoutTable 6-1 QY03 TC9092AF pin list No Pin namePin function Table 6-2 QY03 TC9092AF pin list No Pin namePin function Power supply +5V Fig. 6-9 QY10/QY11 M518221-30ZS internal block diagramFig. 6-10 QY10/QY11 M518221-30ZS pin layout Terminal name2. CIRCUIT DESCRIPTION SECTION VII 3-DIMENSION Y/C SEPARATOR CIRCUIT2-1. Configuration 1. OUTLINESignal name Fig. 7-1 3-dimension Y/C separator unit block diagramTerminal description PZ01 Voltage1-1. Theory of Operation SECTION VIII VERTICAL OUTPUT CIRCUIT 1. OUTLINE2-1. Actual Circuit 2. V OUTPUT CIRCUIT2-2. Sawtooth Waveform Generation 2-2-1. Circuit Operation2-3-1. Circuit Operation 2-3. V OutputFig. 8-7 Output stage power supply voltage 2-4. V Linearity Characteristic Correction 3. PROTECTION CIRCUIT FOR V DEFLECTION STOP2-4-1. S-character Correction Up-and Down-ward Extension Correction 2-4-2. Up-and Down-ward Linearity Balance3-1-1. Theory of Operation 3-1. +35V Over Current Protection Circuit4. RASTER POSITION SWITCHING CIRCUIT 4-1. Outline4-2. Operation 2. HORIZONTAL DRIVE CIRCUIT SECTION IX HORIZONTAL DEFLECTION CIRCUIT3. BASIC OPERATION OF HORIZONTAL DRIVE Fig. 9-1 H drive circuit block diagramOn period + ibOFF period current4. HORIZONTAL OUTPUT CIRCUIT 4-1. Theory of Operation4-1-1. Operation of Basic Circuit 2. t2 Description of the basic circuit 1. t1~t23. t2~t3 4. t3~t4Amplitude Correction 4-1-2. Linearity Correction LIN1 S-curve Correction S Capacitor Fig. 9-9 Linearity coil 2 Left-right Asymmetrical Correction LIN coil4-2-1. Outline 4-2. White Peak Bending Correction Circuit4-2-2. Operation Theory Fig. 9-11 White peak bending correction circuit4-3-1. Outline 4-3. H Blanking4-3-2. Theory of Operation 4-3-3. Circuit Operation4-4. 200V Low Voltage Protection 4-4-1. Outline4-4-2. Theory of Operation 5-1. Theory of Operation 5. HIGH VOLTAGE GENERATION CIRCUIT5-1-2. +35V 5-1-1. +210V5-1-3 5-1-4. High Voltage6-1. High Voltage Regulator 6. HIGH VOLTAGE CIRCUIT6-1-1. Outline Fig. 9-19 Basic circuit for high voltage regulatorFig. 9-22 Actual high voltage regulator circuit 6-1-3. Actual7-1. Outline 7. X-RAY PROTECTION CIRCUIT7-2. Operation Fig. 9-23 X-RAY protection circuit8-1. Outline 8. OVER CURRENT PROTECTION CIRCUIT8-2. Operation Fig. 9-24 Over current protection circuit1. DEFLECTION DISTORTION CORRECTION IC TA8859CP SECTION X DEFLECTION DISTORTION CORRECTION CIRCUIT SIDE DPC CIRCUIT1-2. Functions and Features Block Diagram2. DIODE MODULATOR CIRCUIT 3. ACTUAL CIRCUIT 3-1. Basic Operation and Current Path 3-1-1. Later Half Scanning Period3-1-2. First Half Scanning Period 3-1-4. First Half of Scanning Period 3-1-3. Later Half of Flyback Period2-1. Configuration SECTION XI DIGITAL CONVERGENCE CIRCUIT1. OUTLINE 2. CIRCUIT DESCRIPTION∗∗∗812bit8 Fig. 11-1 Block diagram3. PICTURE ADJUSTMENT 3-2. Service Mode 3-2-1. Outline3-2-2. Entering/Exiting Mode 3-2-3. Initial screen 1 First screen2 Second screen TOSHIBA 3-2-4. Key function of remote control unit3-2-5. Operation procedure 3-3. Each Screen Adjustment Method3-3-1. Normal/Full 3-3-2. Theater Wide1 3-3-3. Theater Wide 3-3-4. Theater Wide 4. CASE STUDY 4-1. When CRT is Replaced4-2. When Convergence Unit is Replaced 5. TROUBLESHOOTING 5-1. Adjusting Procedure in Replacing CRT5-2. Adjusting Procedure in Replacing Convergence Unit/Main Def 6-2-1. Signal flow 6. CONVERGENCE OUTPUT CIRCUIT4 To adjust from outside of digital convergence 6-1. Outline6-3. Convergence Block Diagram Vertical 7. CONVERGENCE TROUBLESHOOTING CHARTF BP WIDEVOLTAGEREG DV DH