Mitsubishi LCD1855NX-BK Service Manual page 26

TROUBLE IN DPM
CHECK
R233, R234?
YES
CHECK
U501 PIN 6
WAVEFORM
(24MHz) ?
YES
CHECK
U501 PIN 11
(0V) ?
YES
TROUBLE IN PC
4. TROUBLE IN DPM
NO
NO
NO
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CHECK PC
PC IS NOT GOING
INTO DPM OFF MODE
TROUBLE IN
X501
TROUBLE IN
SIGNAL CABLE