Convergence Troubleshooting Chart | Toshiba TW40F80 manual

7. CONVERGENCE TROUBLESHOOTING CHART

Relay turns on			Reray OFF
once but immediately
once but immediately
turns off.

	Convergence PCB,	Protect 1
	pull out of P712.	Protect 1
	pull out of P712.

Relay operation sound	Reray ON			No Convergence
at power on.				correction wave.
at power on.		OK		correction wave.

Check screen modes of picture.

Reray ON

Reray ON

Check power supply circuit.

Reray OFF	Reray OFF

Check Q751, Q752 and repair.

Reray OFF

Check P708 R/G/B correction wave.

Proceed to "protection

circuit diagnosis procedures".

Convergence output signals correction wave

Pump-up

+30V

OK

Check voltage at –15V+30V pump up.

OK

Are output signals

applied to H, Vblk of P711.

OK

NG

NG

Check power supply circuit.

Check DEF PC13.

Vertical	Horizontal
Q751	Q752
(R/G/B)	(R/G/B)

		Check voltage across
0V		–9V+5V Q754, Q755, Q756.

-15V			OK
-15V


		Check signals of all IC
		and associated cirduits.

NG

Check Q754, Q755, Q756 and repair.

Fig. 11-6

100

Image 100

Toshiba TW40F80 manual Convergence Troubleshooting Chart

Contents

TW40F80 Contents Terminal FUNCTION, Description and Block Diagram Wide Aspect Conversion Circuit Failure Analysis Section X Deflection Distortion Correction Circuit Section XI Digital Convergence Circuit Section Feature Improved ServiceabilityOutline Merits of BUS System Reduction of Parts Count Specifications Chassis Model Front View Video 3 Inputs Rear View IN-VIDEO Remote Control View 100 Chassis Layout Starsight Newosd FRO. Surr Construction of Chassis Major Features Section II TUNER, IF/MTS/S. PRO Module Circuit BlockOutline RF AGC Audio Multiplex Demodulation Circuit A.PRO block diagram A.PRO Section Audio Processor Configuration of the audio circuit and signal flow are given POP Tuner Terminal No Name Operation of Channel Selection Circuit Microcomputer SDA SCL Microcomputer Terminal Function Microcomputer Terminal Name and Operation Logic Terminal Name Function In/Out Logic Remarks EEPROMQA02 On Screen FunctionSDA System Block Diagram Local KEY Detection Method Local key assignment Function Code Function Remote Control Code AssignmentTo TV set Custom codes are 40-BFH TV set for North U.S.A Code Function Optional Setting for Each Model OPT0 OPT1 Models HEX Test Signal Selection Entering to Service ModeService Adjustment Contents to be Confirmed by Customer Failure Diagnosis ProcedureExecuting Self Diagnosis Function Understanding Self Diagnosis Indication Self Check Clearing method of self diagnosis result TV does Not Turned on Troubleshooting ChartYES No Acception of KEY-IN No Picture Snow Noise Memory Circuit Check No Indication On Screen Section IV DVD Switch Circuit DVD Switch Block Diagram Outline Configuration Section V WAC Circuit OutlineCircuit Operation Operation Wide aspect conversion unit block diagram PB6348 Pin Function Pin function of TC9097F QFP 80 pin Names and functions of TC9097F Name Function VFL2 Block Diagram TC9097F system block diagram Wide Aspect Conversion Circuit Failure Analysis Procedures E2PROM OK? Adjustment Method Raster Horizontal One Principles of Operation Section VI Dual Circuit OutlineScreen multi-search process System Component Diagram of Dual Unit Video/Color/Deflection Process Section OSD Sub Screen Process Section Sub screen process section Main/Sub Screen Superimposing Section Main/Sub screen superimposing section Main IC Terminal FUNCTION, Description and Block Diagram DiagramQY01 MPC1832GT QY01 mPC1832GT pin layout QY03 TC9092AF internal block diagram QY03 TC9092AF pin layout QY03 TC9092AF pin list No Pin name Pin function CKW MRD1 QY10/QY11 M518221-30ZS internal block diagram Configuration Circuit Description Section VII 3-DIMENSION Y/C Separator Circuit OutlineCircuit Description Terminal description PZ01 Section Viii Vertical Output Circuit Outline Theory of Operation Output Circuit Actual CircuitSawtooth Waveform Generation Circuit Operation Output Output stage power supply voltage Linearity Characteristic Correction Protection Circuit for V Deflection StopCharacter Correction Up-and Down-ward Extension Correction Up-and Down-ward Linearity Balance +35V Over Current Protection Circuit Theory of OperationUZ22BSD UZ11BSB Raster Position Switching Circuit Ketsu Signal Section IX Horizontal Deflection Circuit OutlineHorizontal Drive Circuit Basic Operation of Horizontal Drive On period OFF period Signal DEF/POWER PCB Horizontal Output CircuitOperation of Basic Circuit FBT Description of the basic circuit T1~t2 T2~t3T3~t4 T4~t6 Linearity Correction LIN Amplitude CorrectionCurve Correction S Capacitor Left-right Asymmetrical Correction LIN coil Linearity coil White Peak Bending Correction Circuit OutlineOperation Theory EHT Blanking Low Voltage Protection Gate Protector High Voltage Generation Circuit AFCABL High Voltage DPC Circuit Regulator 2. +35V 1. +210VHigh Voltage CR-BLOCK High Voltage CircuitAnode FBT CR-BLOCK E H ActualED’ RAY Protection Circuit 23 X-RAY protection circuit Over Current Protection Circuit Functions and Features Block Diagram Diode Modulator Circuit OUT Actual Circuit Later Half Scanning Period Basic Operation and Current PathFirst Half Scanning Period First Half of Scanning Period Later Half of Flyback PeriodP.T Section XI Digital Convergence Circuit Outline Reset MemoryProm PLL Picture Adjustment Service Mode Entering/Exiting Mode First screen Second screen Initial screenSfull Key function of remote control unit ENT Each Screen Adjustment Method Operation procedureNormal/Full Theater Wide1 Theater Wide 269.5 When Convergence Unit is Replaced When CRT is ReplacedCase Study Adjusting Procedure in Replacing CRT TroubleshootingAdjusting Procedure in Replacing Convergence Unit/Main Def Convergence Output Circuit Convergence Block Diagram Convergence Troubleshooting Chart Main Unit