LG RT-21FD90VQ - Page 14

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NO Picture No Sound
Is Any OSD displayed?
Check IC11 pin71, 72, 73
(R, G,B out)
OK
Store on manual - program MENU
Does the auto Program
Operate properly
Check pin40(V out 1)
1Vp
-
p
Check 1 8V 3. 3V
5V DC Voltage
Check SMPS Trans
Secondary Voltage
Check pin18
Reset Voltage
Check IC13
(Reset IC)
Check pin57, 58
SCL, SDA
Check IC12(EEPROM)
& SCL SDA Line
Relace IC11
Q501, Q503, Q504
(R, G, B out of IC11)
Check / Replace
CPT Board component
Go to
No Sound
Picture OK
OK
OK
OK
OK
NO
NO
NO NO
NO
NO
3 3V DC
OK
OK
3 3V DC
Check receiving system in MENU
& execute Auto Program.
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