LG Electronics 42LC2D(B), 32LC2D(B), 37LC2D(B) service manual Troubleshooting

Page 17

TROUBLESHOOTING

TROUBLESHOOTING

No image

Is the Set ON?

YES

Is the input

NO

Attach the input

cable attached?

cable(s)

NO

YES

Push the POWER

ON key

Check the

Power Error

PASS

What is

Condition of all

Connectors, wafers,

the input signal

I2C In the

mode?

FAIL

system.

Check Vout

FAIL

Check 33V

And 5V at pin

RF

Signal at pin 9.

7,6 resp. of

Of Tuner

Tuner

PASS

-

PASS

Change the Tuner

17 -

Check LVDS

PASS

Check 24bit

PASS

Check Main_V

Check Sub_V

PASS

Check Vout

FAIL

RGB at AR700-

Correct the circuit

Output of Cortez

At R309

At R302

Signal at C230

AR705

PASS

Check for S/W error

FAIL

FAIL

FAIL

Replace Cortez

Check Power

Check Q303

PASS

Replace CXA2069

Circuit and 9V

Levels and crystal

PASS

at L300

Replace Hudson

FAIL

Correct the circuit

FAIL

Power Error

Image 17

Contents CHASSIS LD61A FACTORY NAME 32LC2DB-EC/37LC2DB-EC/42LC2DB-EC READ THE SAFETY PRECAUTIONS IN THIS MANUALBEFORE SERVICING THE CHASSIS SERVICE MANUALCONTENTS CONTENTSPRODUCT SAFETY SPECIFICATIONIMPORTANT SAFETY NOTICE SAFETY PRECAUTIONSGeneral Guidance Leakage Current Hot Check circuitElectrostatically Sensitive ES Devices SERVICING PRECAUTIONSReplacement IC Remove/ReplacementSmall-Signal Discrete Transistor Removal/Replacement Power Output, Transistor Device Removal/Replacement1.General SpecificationTV SPECIFICATIONreatment of the front polarizer 2. General Specification4.Component Video Input Y, PB, PR 3.Optical FeatureLCD ModuleRGB-PC EDID DATA 5. RGB PC INPUT Mode Table6. RGB DTV INPUT Mode Table HDMI EDID DATA 7. HDMI INPUT Mode Table8. HDMI DTV Mode Table 8. Mechanical specification 7. Mechanical specification32LC2D Table 1 Scart Arrangement 1.Full ScartTable 2 Scart Arrangement 2.Half Scart 2. Specification ADJUSTMENT INSTRUCTION1. Application Range 3. Channel Memory6. ADC Calibration 5. Select method of Panel sizeBefore AV ADC Calibration, should be executed the Panel size selectionBefore White-balance, the AV ADC should be done 7. White BalanceCase1 EC and FC model use PAL-BGDHI composite signal Cool11000K - x 0.274±0.003, y 0.286±0.003FUNTION SVC REMOCONTROUBLESHOOTING No image attached? Is the input cableNo image PASS No image No image No image No image No image Volume level Of TROUBLESHOOTING AV1, 2, 3, 4/S-VideoAV4/S-Video L/R signal AV1,AV2 ,AV3TROUBLESHOOTING DTV/HDMI-Audio TROUBLESHOOTING RF/Component/PC TDFB-G236P DVB/PAL BLOCK DIAGRAMMainWafer FFC WaferAUDIO/VI DEO SW BLOCK DIAGRAMJackCXA2069Q Sound processor010 020050 EXPLODED VIEW32LC2DDESCRIPTION EXPLODED VIEW PARTS LIST32LC2DEXPLODED VIEW37LC2D EXPLODED VIEW PARTS LIST37LC2D 020080 130030 150 090 EXPLODED VIEW42LC2DEXPLODED VIEW PARTS LIST42LC2D CAPACITOR REPLACEMENT PARTS LISTMAIN BOARD DATE 2006. 05 DATE 2006. 05 DATE 2006. 05 DIODEs COIL & CORE & INDUCTOR RESISTORs TRANSISTORDATE 2006. 05 DATE 2006. 05 DATE 2006. 05 DATE 2006. 05 JACK BOARD OTHERsDATE 2006. 05 COIL & CORE & INDUCTOR DIODEsRESISTORs TRANSISTORDATE 2006. 05 CONTROL BOARD IR/LED BOARD SIDE A/V BOARDPage Page Page Page Page Printed in Korea P/NO 38289S0043