LG Electronics 37LC2D(B), 32LC2D(B), 42LC2D(B) service manual TROUBLESHOOTING DTV/HDMI-Audio

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TROUBLESHOOTING DTV/HDMI-Audio

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TROUBLESHOOTING DTV/HDMI-Audio

Push the POWER

Turn OFF the Mute

Increase the Volume

Correct them

ON key

YES

Check

Is the

Is the

Is

the Condition

No Audio

Volume level Of

of all Connectors,

Set ON?

Mute ON?

the set?

wafers, I2C In

corresponding

Signal flow?

Check the DTV

HDMI I2S signal atR183,

Check the interfacing ciruit of

184,186 and R1218-1220

Replace NSP

HDMI or replace STi5100

respectively according to The

accordingly w.r.t the mode.

corresponding mode On

main board

Check the

Check

PWM output of NSP

3.3V supply across

across

L402 and 1.8V at

R436-439

C448

Check the

Power error or

MUX I2S output

replace

At R491,493,494 On

IC605(TC74LCX157)

jack board

Power Error

Replace the MSP

Check the

Check the

Check audio

Check 18V

Amplifier output level

supply voltage 8V

output at MSP across

supply at L421

At L423-426

across L403

R429-431.

There may be some

Replace

error in Audio

TAS5122(amp)

source.

Power Error

Image 28

Contents READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD61A FACTORY NAME 32LC2DB-EC/37LC2DB-EC/42LC2DB-ECBEFORE SERVICING THE CHASSIS SERVICE MANUALCONTENTS CONTENTSPRODUCT SAFETY SPECIFICATIONSAFETY PRECAUTIONS IMPORTANT SAFETY NOTICEGeneral Guidance Leakage Current Hot Check circuitSERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesIC Remove/Replacement ReplacementSmall-Signal Discrete Transistor Removal/Replacement Power Output, Transistor Device Removal/ReplacementSPECIFICATION 1.General SpecificationTV2. General Specification reatment of the front polarizer3.Optical FeatureLCD Module 4.Component Video Input Y, PB, PR6. RGB DTV INPUT Mode Table 5. RGB PC INPUT Mode TableRGB-PC EDID DATA 8. HDMI DTV Mode Table 7. HDMI INPUT Mode TableHDMI EDID DATA 7. Mechanical specification 8. Mechanical specification32LC2D Table 1 Scart Arrangement 1.Full ScartTable 2 Scart Arrangement 2.Half Scart ADJUSTMENT INSTRUCTION 2. Specification1. Application Range 3. Channel Memory5. Select method of Panel size 6. ADC CalibrationBefore AV ADC Calibration, should be executed the Panel size selection7. White Balance Before White-balance, the AV ADC should be doneCase1 EC and FC model use PAL-BGDHI composite signal Cool11000K - x 0.274±0.003, y 0.286±0.003SVC REMOCON FUNTIONTROUBLESHOOTING No image Is the input cable attached?No image PASS No image No image No image No image No image TROUBLESHOOTING AV1, 2, 3, 4/S-Video Volume level OfAV4/S-Video L/R signal AV1,AV2 ,AV3TROUBLESHOOTING DTV/HDMI-Audio TROUBLESHOOTING RF/Component/PC BLOCK DIAGRAMMain TDFB-G236P DVB/PALWafer FFC WaferBLOCK DIAGRAMJack AUDIO/VI DEO SWCXA2069Q Sound processorEXPLODED VIEW32LC2D 010 020050EXPLODED VIEW PARTS LIST32LC2D DESCRIPTIONEXPLODED VIEW37LC2D EXPLODED VIEW PARTS LIST37LC2D EXPLODED VIEW42LC2D 020080 130030 150 090EXPLODED VIEW PARTS LIST42LC2D MAIN BOARD REPLACEMENT PARTS LISTCAPACITOR DATE 2006. 05 DATE 2006. 05 DATE 2006. 05 DIODEs COIL & CORE & INDUCTOR TRANSISTOR RESISTORsDATE 2006. 05 DATE 2006. 05 DATE 2006. 05 DATE 2006. 05 OTHERs JACK BOARDDATE 2006. 05 DIODEs COIL & CORE & INDUCTORTRANSISTOR RESISTORsDATE 2006. 05 CONTROL BOARD SIDE A/V BOARD IR/LED BOARDPage Page Page Page Page P/NO 38289S0043 Printed in Korea