E2PROM OK? | Toshiba TW40F80 specification

4.WIDE ASPECT CONVERSION CIRCUIT FAILURE ANALYSIS PROCEDURES

4-1. Left Screen Picture Failure in Normal Mode/Double Window Modes (No Picture, Sync Distributed)

Picture fallure (Normal/DW mode)

Super live		N
mode OK?
mode OK?

	Y
		N

LX18 adjustment
OK?
OK?

	Y


I2C bus pin 7 , 8		N
of PX01 OK?

	Y
		N

Is clock at pin 47
of QX01 OK?
of QX01 OK?

	Y
		Y
Signals at pins 5 , 6 ,		Y
7 of PX02 OK?
7 of PX02 OK?

	N
		N

QX01 input / output
OK?
OK?

	Y

Output at pins 5 , 6 , Y

7of PX02 OK?

N

Readjustment

I2C bus line check.

Output at pin 3 (HD) Y of PX02 OK?

N

Receive circuit check.

Replace

E2PROM OK?

Check circuits other than WAC unit.

Check around of QX03.

Check around

QX02.

Check receive circuit.

Replace QX01.

Check associated circuit (Tr.etc).

END

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Image 42

Toshiba TW40F80 manual Wide Aspect Conversion Circuit Failure Analysis Procedures, E2PROM OK?

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 Outline Merits of BUS System Section FeatureImproved Serviceability 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 Outline Major FeaturesSection II TUNER, IF/MTS/S. PRO Module Circuit Block 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 On Screen Function EEPROMQA02SDA System Block Diagram Local KEY Detection Method Local key assignment Function Remote Control Code Assignment Code FunctionTo 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 Entering to Service Mode Test Signal SelectionService Adjustment Failure Diagnosis Procedure Contents to be Confirmed by CustomerExecuting Self Diagnosis Function Understanding Self Diagnosis Indication Self Check Clearing method of self diagnosis result Troubleshooting Chart TV does Not Turned onYES 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 Circuit Operation ConfigurationSection V WAC Circuit Outline 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 Section VI Dual Circuit Outline Principles of OperationScreen 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 QY01 Main IC Terminal FUNCTION, Description and Block DiagramDiagram 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 Section VII 3-DIMENSION Y/C Separator Circuit Outline Configuration Circuit DescriptionCircuit Description Terminal description PZ01 Section Viii Vertical Output Circuit Outline Theory of Operation Sawtooth Waveform Generation Output CircuitActual Circuit Circuit Operation Output Output stage power supply voltage Character Correction Up-and Down-ward Extension Correction Linearity Characteristic CorrectionProtection Circuit for V Deflection Stop Up-and Down-ward Linearity Balance UZ22BSD +35V Over Current Protection CircuitTheory of Operation UZ11BSB Raster Position Switching Circuit Ketsu Horizontal Drive Circuit SignalSection IX Horizontal Deflection Circuit Outline Basic Operation of Horizontal Drive On period OFF period Operation of Basic Circuit Signal DEF/POWER PCBHorizontal Output Circuit FBT T3~t4 Description of the basic circuit T1~t2T2~t3 T4~t6 Amplitude Correction Linearity Correction LINCurve Correction S Capacitor Left-right Asymmetrical Correction LIN coil Linearity coil Operation Theory White Peak Bending Correction CircuitOutline EHT Blanking Low Voltage Protection Gate Protector ABL High Voltage Generation CircuitAFC High Voltage DPC Circuit Regulator 1. +210V 2. +35VHigh Voltage High Voltage Circuit CR-BLOCKAnode Actual FBT CR-BLOCK E HED’ RAY Protection Circuit 23 X-RAY protection circuit Over Current Protection Circuit Functions and Features Block Diagram Diode Modulator Circuit OUT Actual Circuit Basic Operation and Current Path Later Half Scanning PeriodFirst Half Scanning Period Later Half of Flyback Period First Half of Scanning PeriodP.T Section XI Digital Convergence Circuit Outline Prom ResetMemory PLL Picture Adjustment Service Mode Entering/Exiting Mode Initial screen First screen Second screenSfull Key function of remote control unit ENT Operation procedure Each Screen Adjustment MethodNormal/Full Theater Wide1 Theater Wide 269.5 When CRT is Replaced When Convergence Unit is ReplacedCase Study Troubleshooting Adjusting Procedure in Replacing CRTAdjusting Procedure in Replacing Convergence Unit/Main Def Convergence Output Circuit Convergence Block Diagram Convergence Troubleshooting Chart Main Unit