Hitachi Alpha L42A404, Service Manual

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L42A404
10
2). No Picture, Picture Failed (Color Failed, Dark Picture, Beat Noise, Etc.)
First, confirm the connection of all connectors between Board's, then survey by following the flowchart as shown
below.
CN701 (1) 3.3V
(2) 0~3.3V
(3)~(4) 12V
(5)~(7) 0V
(8)~(9) 24V
(10)~(12) 5V
No Picture, Picture failed
(Color failed, Dark picture,
Beat noise, etc.)
Occured at only
Video1 input (CVBS), or
Video2 input (CVBS, S2)?
Main Board
No
Yes
Main Board
Voltage of all pin of
CN701 on Main Board is
correct?
Power Board
No
Yes