Toshiba TW40F80 manual Microcomputer, Sda Scl

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3. MICROCOMPUTER

Microcomputer TMP87CS38N-3320 has 60k byte of ROM capacity and equipped with OSD function inside.

The specification is as follow.

•Type name : TMP87CS38N-3320

•ROM : 60k byte

•RAM : 2k byte

•Processing speed : 0.5 m s (at 8MHz with Shortest com- mand)

•Package : 42 pin shrink DIP

•I 2C-BUS : two channels

• PWM : 14 bit x 1, 7 bit x 9

•ADC : 8 bit x 6 (Successive comparison system, Conver- sion time 20ms)

IIC device controls through I2C bus. (Timing chart : See Fig. 3-1)

•LED uses big current port for output only.

•For clock oscillation, 8MHz ceramic oscillator is used.

•I 2C has two channels. One is for EPROM only.

•Self diagnosis function which utilizes ACK function of I2C is equipped

•Function indication is added to service mode.

•Remote control operation is equipped, and the control by set no touch is possible. (Bus connector in the con- ventional bus chassis is deleted.)

•Substantial self diagnosis function

(1)B/W composite video signal generating function (micom inside, green crossbar added)

(2)Generating function of audio signal equivalent to 1kHz (micom inside)

(3)Detecting function of power protection circuit opera- tion

(4)Detecting function of abnormality in IIC bus line

(5)Functions of LED blink indication and OSD indica- tion

(6)Block diagnosis function which uses new VCD and

AV SW

SDA
SCL	1 - 7	8	9
	1 - 7	8	9
Start	Address	R/W	Ack
condition
	Approx.180μS

1 - 7 8 9

Data Ack

1 - 7 8 9

DATA Ack

Some device may have no data, or may have data with several bytes continuing.

Stop condition

Fig. 3-1

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Contents TW40F80 Contents Terminal FUNCTION, Description and Block Diagram Wide Aspect Conversion Circuit Failure AnalysisSection X Deflection Distortion Correction Circuit Section XI Digital Convergence CircuitOutline Merits of BUS System Section FeatureImproved Serviceability Reduction of Parts CountSpecifications Chassis ModelFront View Video 3 InputsRear View IN-VIDEORemote Control View 100Chassis Layout Starsight Newosd FRO. SurrConstruction of Chassis Outline Major FeaturesSection II TUNER, IF/MTS/S. PRO Module Circuit Block RF AGCAudio Multiplex Demodulation Circuit A.PRO block diagram A.PRO Section Audio ProcessorConfiguration of the audio circuit and signal flow are given POP Tuner Terminal No NameOperation of Channel Selection Circuit Microcomputer SDA SCLMicrocomputer Terminal Function Microcomputer Terminal Name and Operation Logic Terminal Name Function In/Out Logic RemarksOn Screen Function EEPROMQA02SDA System Block Diagram Local KEY Detection Method Local key assignment FunctionRemote 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 HEXEntering to Service Mode Test Signal SelectionService Adjustment Failure Diagnosis Procedure Contents to be Confirmed by CustomerExecuting Self Diagnosis Function Understanding Self Diagnosis Indication Self CheckClearing method of self diagnosis result Troubleshooting Chart TV does Not Turned onYES No Acception of KEY-IN No Picture Snow NoiseMemory Circuit Check No Indication On ScreenSection IV DVD Switch Circuit DVD Switch Block Diagram Outline Circuit Operation ConfigurationSection V WAC Circuit Outline OperationWide aspect conversion unit block diagram PB6348 Pin Function Pin function of TC9097F QFP 80 pinNames and functions of TC9097F Name FunctionVFL2 Block Diagram TC9097F system block diagramWide Aspect Conversion Circuit Failure Analysis Procedures E2PROM OK?Adjustment Method Raster Horizontal OneSection 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 sectionMain/Sub Screen Superimposing Section Main/Sub screen superimposing sectionQY01 Main IC Terminal FUNCTION, Description and Block DiagramDiagram MPC1832GTQY01 mPC1832GT pin layout QY03 TC9092AF internal block diagram QY03 TC9092AF pin layout QY03 TC9092AF pin list No Pin name Pin function CKWMRD1 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 OperationSawtooth Waveform Generation Output CircuitActual Circuit Circuit OperationOutput 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 BalanceUZ22BSD +35V Over Current Protection CircuitTheory of Operation UZ11BSBRaster Position Switching Circuit KetsuHorizontal Drive Circuit SignalSection IX Horizontal Deflection Circuit Outline Basic Operation of Horizontal DriveOn period OFF period Operation of Basic Circuit Signal DEF/POWER PCBHorizontal Output Circuit FBTT3~t4 Description of the basic circuit T1~t2T2~t3 T4~t6Amplitude Correction Linearity Correction LINCurve Correction S Capacitor Left-right Asymmetrical Correction LIN coil Linearity coilOperation Theory White Peak Bending Correction CircuitOutline EHTBlanking Low Voltage Protection Gate ProtectorABL High Voltage Generation CircuitAFC High Voltage DPC Circuit Regulator1. +210V 2. +35VHigh Voltage High Voltage Circuit CR-BLOCKAnode Actual FBT CR-BLOCK E HED’ RAY Protection Circuit 23 X-RAY protection circuitOver Current Protection Circuit Functions and Features Block DiagramDiode Modulator Circuit OUTActual 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 PLLPicture Adjustment Service Mode Entering/Exiting ModeInitial screen First screen Second screenSfull Key function of remote control unit ENTOperation 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