LG Electronics 29FX6ALX-ZG service manual No Picture/ No Sound, Sda

4) No Picture/ No Sound

Is any OSD displayed?

NO

OK

Check IC501 pin 83, 84, 85 (R, G, B out)

Check receiving system in MENU & execute Auto - Program

OK

NO

Check the waveform pin73(H-out)

OK

NO

Check IC501 pin 83, 84, 85 (R, G, B out)

OK

Check pin3 Reset

Voltage

OK

Check pin8, 12 SCL,

SDA

OK

Replace IC501

Does the auto - Program operate properly

OK

Store on manual -program MENU

NO

Check SMPS Trans

Secondary Voltage

NO

Check IC12(EEPROM)

& SCL, SDA, Line

Go to No sound/ picture OK

P13A (R, G, B out of IC501)

P13A (R, G, B out of IC501)

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