LG FLATRON L1800PM Service Manual page 19

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POWER INDICATOR OFF
CHECK
12V DC?
YES
CHECK
U5 OUTPUT
(5V) ?
YES
CHECK
U7 PIN 1
OUTPUT ?
YES
TROUBLE IN U3
5. AUDIO NO POWER
NO
NO
CHECK
R1, R2?
TROUBLE
IN U5
NO
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TROUBLE BUILT
IN POWER
NO
TROUBLE IN
R1, R2
YES
TROUBLE IN U7