LG 32LG50FD (CHASSIS:LJ82A) Service Manual ▷ View online
- 21 -
No OSD Trouble Shooting
Check Q903 P in #1
Voltag e Level 12V
Check
Power con necto r
Replace Power b oard
Check P90 0 or P902
#17(RCLK-) , #18(RCLK+)
Maybe BCM3553 has
proble ms
Check L VDS Cable
Check PDP/LCD Module
Control b oard
Y
NY
Y
N
Check L 900
Voltag e Level 12V
Replace L 901
Y
N
Y
Replace Cab le
N
- 22 -
Digital TV Video Trouble Shooting
Check RF Cable
Check TU800 TP Clock, Data, Sync
PIN#10 (38.1MHz), PIN#13, PIN#14
Maybe Tuner(TU800) has
proble ms
Check BCM 3553 Outp ut TP
Clock, Data, Sy nc
R153, R155, R152
Check BCM 7412 Clock, Hsync, Vsync
R108 8(Tpy. 74.25MHz), R1087, R1086
Y
Y
N
Check Tuner 5V Po wer
IC804 #3 Pin
Replace IC804
Y
N
Y
Maybe BCM3553(IC100) has
proble ms
N
Maybe BCM7412(IC1000) has
proble ms
N
Check PL D Clo ck, Hs ync, Vsy nc
R1102(Typ. 74.25MHz), R1100, R1101
Y
Redo wnload PLD file or re place
N
Maybe BCM3553(IC100) has
proble ms
Y
Check T UNER PIN#9
(ERROR FLAG)
Bad Tuner. Replace Tuner.
LOW
HIGH
Check BCM 7412 Input Clock
R107 (27MHz)
Replace it
N
Y
- 23 -
Analog TV Video Trouble Shooting
Check RF Cable
Check CVBS sig nal
TU800 #17 Pin
Maybe Tuner(TU800) has
proble ms
Check CVBS sig nal
IC808 #8 Pin
Check CVBS sig nal
C658
Y
Y
N
Check Tuner 5V Po wer
IC804 #3 Pin
Replace it
Y
N
Y
Replace IC808 or ch eck L 800 5V
po wer
N
Replace it
N
Y
Maybe BCM3553(IC100) has
proble ms
- 24 -
Component Video Trouble Shooting
Check sig nal fo rmat
Is it sup ported?
Check sig nal
L700, L701. L702 / L704, L705,
L706
Replace it.
Check sig nal
C638, C639, C640 / C628, C629,
C630
Y
Y
N
Check JK 700 / JK702
Replace connector
Y
N
Y
Replace it
N
Maybe BCM3553(IC100) has
proble ms
Y
Check Component Cable
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