Trouble Shooting - LG 21FU6PL Service Manual

1. TV FUNCTIONAL
11100 TUNER / IF
12500 VIDEO/MICOM
13100
SMPS
18200
Secondary
18100 SMPS Primary
2. TU / IF SECTION
11100 TUNER
11101
TUNER INPUT SECTION
5V(ZD102,C108,C106)
30V(C103,C107,ZD103,R150)
TUNER Not Working
TU SEARCH Problem
TUNING Problem
3. VIDEO PROCESSING
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Only for training and service purposes.

TROUBLE SHOOTING

14400 HORZ. DEFL
SOUND 15300 VERT. DEFL
16100 CPT
11100
2 7 8 10
3
TUNER/IF
6
11
(TU101)
9
4 5 1
11102
CONTROL SECTION
SDA(R514)
SCL(R516)
TUNER Not Working
TU SEARCH Problem
TU Weak Picture Signal
61 ~ 64
31,32 1 CHIP IC (IC501)
1~13
12
11103
MOD. CONTROL SECTION
AGC(C110,R151,J108,R109
,R154,R108)
TV system Detection Problem
TV MODE Weak Picture Signal
35,36,40
50~64
46~49
LV762XX
17~22
04,09,35,4
41 9,62
- 14 -
11104
VIDEO/SOUND BUFFER
IF(Z111,C101,R100)
No Video Signal No Sound Signal
Video S/N Problem Sound S/N Problem
Video Noise· No Sound Noise
LGE Internal Use Only