LG 42PG20-UA (CHASSIS:PU84A) Service Manual ▷ View online
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TROUBLE SHOOTING GUIDE
- 26 -
TROUBLE SHOOTING GUIDE
AV Video Trouble Shooting
Check signal format
Is it supported?
Check signal
C948 (Composite), C991 / C992 (S-Video) (Rear)
C949 (Composite)
Replace it.
Check signal
C111 (Composite), C109 / C110 (S-Video) (Rear)
C174 (Composite) (Side)
Y
N
Check JK601 (Rear)
Check JK604 (Side)
Replace connector
Y
N
Y
Replace it
N
Maybe Mstar(IC100) has problems
Y
Check AV Cable / S-Video Cable
Y
- 27 -
TROUBLE SHOOTING GUIDE
- 28 -
TROUBLE SHOOTING GUIDE
HDMI Video Trouble Shooting
Check signal format
Is it supported?
Y
Check J801 / J802 / J803
Replace connector
Y
N
Y
Check HDMI Cable
Check EDID NVRAM
(IC801, 802, 804)
Power & I2C Signal (#5, #6)
Replace it or re-download
Y
N
Check HDCP Key NVRAM (IC102)
Power & I2C Signal (#5, #6)
Replace it
Y
N
Check IC803 Out Voltage Level
3.3V
Replace it
Y
N
Check L802 Voltage Level 3.3V
Replace it
Y
N
Check IC803 Clock Signal
#26, #27
Replace it
Y
N
Maybe Mstar(IC100) has problems
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