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LG 29FS4ALX Service Manual page 16

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4) No Picture/ No Sound
OK
Check IC501 pin 83,
84, 85 (R, G, B out)
NO
Check the waveform
pin73(H-out)
OK
P13A (R, G, B out of
IC501)
NO
NO
Check IC501 pin 83,
84, 85 (R, G, B out)
Check pin3 Reset
Voltage
Check pin8, 12 SCL,
SDA
Replace IC501
Is any OSD displayed?
Check receiving system in MENU
& execute Auto - Program
Does the auto - Program
operate properly
Store on manual -program MENU
NO
Check SMPS Trans
Secondary Voltage
OK
OK
NO
Check IC12(EEPROM)
& SCL, SDA, Line
OK
P13A (R, G, B out of
IC501)
OK
OK
OK
Go to No sound/
picture OK

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