Gateway FPD1510 - Trouble in DPM

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4. TROUBLE IN DPM
TROUBLE IN
U501
NO
TROUBLE IN DPM
TROUBLE IN PC
TROUBLE IN
X501
NO
TROUBLE IN
SIGNAL CABLE
NO
YES
YES
YES
CHECK
U501 PIN 6
WAVEFORM
(24MHz) ?
CHECK
U501 (MICOM)
PIN 1, 42 (H/V INPUT)
SIGNAL ?
CHECK
U501 PIN 26
(5V) ?