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42LH250C (CHASSIS:LD91Z) - LG TV Service Manual (repair manual). Page 49

Read LG 42LH250C (CHASSIS:LD91Z) Service Manual online

Making 
Revision 
2009. 2 . 1
LCD TV
Symptom
Analog TV Video Problem
Check RF Cable
MAIN B’D L1201 = 5V ?
YES
MAIN B’D L1202 = 3.3V ?
NO
Replace MAIN B’D IC809
YES
NO
Replace MAIN B’D IC808
MAIN B’D IC804
Pin #2 = 1.2V ?
Replace MAIN B’D IC804
YES
NO
YES
MAIN B’D R1210 Clock ?
NO
Replace MAIN B’D TU1200
19~42LH250C
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