Daewoo 20Q2, 21Q2, 21Q1, 14T2, 21Q4, 14Q2, 20Q1, 14Q1, 21T2, 20Q3 No Soundpicture OK, Abnormal Normal

Page 43

5. NO SOUND(PICTURE OK)

CHECK AUDIO SIGNAL

AT PIN15 OF I501

ABNORMAL

CHECK MUTE VOLTAGE

AT PIN20 OF I701

*MUTE : HIGH

ABNORMAL

NORMAL

CHECK SIF SIGNAL

CHECK /REPLACE

AT PIN1 OF I501

R619, C602, Q604

D605, Q606, I701

ABNORMAL

NORMAL

CHECK / REPLACE I501

CHECK SIGNAL WAVEFORM

AT PIN6 OF I501

[REFER TO WAVEFORM

]

ABNORMAL

NORMAL

CHECK AUDIO SIGNAL

CHECK / REPLACE

CHECK / REPLACE

AT PIN3(TDA7056)

Q501, R602, R603

TUNER, SAW FILTER

NORMAL

[AT PIN 1&9(TDA1519B)]

Q605 & PERI. COMP

Q101, Q102 & PERI. COMP

ABNORMAL

NORMAL

CHECK / REPLACE

OK

CHECK VOLTAGE Vcc(+15Vdc)

AT PIN2(TDA7056)

D813, C821

[AT PIN7(TDA1519B)]

NG

CHECK POWER

CHECK AUDIO OUTPUT SIGNAL

AT PIN6 & 8(TDA7056)

PART CIRCUITS

[AT PIN4 & 6(TDA1519B)

ABNORMAL

NORMAL

CHECK / REPLACE

CHECK / REPLACE

SP01(TDA7056)

I601(TDA7056)

[SP01 & SP02(TDA1519B)]

[I601(TDA1519B]

OK

44

Image 43

Contents Chassis CP-370 Contents Specifications RAY Radiation Precaution Safety InstructionFocus Alignment InstructionsScreen White BalanceVertical S-CORRECTION Geometry Vertical CenterVertical Size Vertical SlopePage IC Description Plastic 42 Ysdp Pins Package Block Diagram Cmos Compatible I/O PinsDisplay Feature AcquisitionSynchronization Controller Sdip 52 package Supply voltage Block DiagramPin Description Pin Name Symbol DescriptionCvbs PIN Symbol Description FeaturesRGB AudioBlock Diagram Sound if Input Pin Description NameVertical Guard Name DescriptionBeam current limitinq Luminance EAST-WEST Drive 3Block Diagram Pin Description TDA4665Base Band Delay LinePIN Description TDA8395 Secam Decoder Symbol PIN DescriptionTDA6106Q Video Output Amplifier Block Diagram Pin DescriptionVeco I802 PC817TDA8356 DC-coupled vertical deflection circuit TDA7056 BTL Audio Output Amplifier 1 Speaker Model 3Block Diagram 4Pin DescriptionPIN Name Symbol Description STR-S5707 Hybrid IC for a Switching RegulatorRating Unit Symbol Rating UnitMIN TYP MAX Ta=25 Description TerminalTDA8138 5.1V+12V regulator with Disable and Reset TDA 1519BAUDIO Output Amplifier 2 Speaker Model PCA84C 122AIC Remocon PIN Signal DescriptionCircuit Description Geometry processing Vertical synchronizationColour decoder Integrated video filters TuningRGB output and black current stabilization Base band delay line TDA4665 Horizontal deflection TDA8356 vertical deflectionOscillator, F/B terminal voltage Pin Power Supply STR-S5707Video amplifiers VIN terminal, start-up circuitThermal shutdown circuit Drive circuitOCP over-current protection function Latch circuitNo Raster Trouble Shooting ChartsNo Pictureraster OK No Vertical Scaningone Horizontal Line on Screen No Color Abnormal Normal No Soundpicture OKNo ON-SCREEN Displaypicture OK No External A/VRF OKRemote Control Unit Troublelocal Control OK Line Voltage IC DC Voltage ChartsInput signal User’s control conditionI503TDA8395 I501TDA8374AI301TDA8356 I502TDA4665LOC PART-CODE PART-NAME Part Type Remark Electrical Parts ListPTSPPWA499 Speaker AS DTC-14Q1VM IC AMP 5PTPS60MB Filter Cera TPS 6.0MBEFC-S6ROME3 CEXF1H229V Electro CEXF1H470V Electro 5PXPS45MB Filter Cera TPS-4.5MB Trap Tapping CCZB1H181K Cera DUZ5R1BM Diode Zener Coil Peaking Wire Copper AWG22 1/0.65 TIN Coating R530 RD-AZ203J R703 RD-AZ272J # Front A/V Part List Option Conn ASS’Y LOC Part Name Difference Part ListLOC Part Name Model Remark CP-370 Inch Difference Part ListPage Page Page Page Page Page Page Page Page Page Page