Hitachi P50H401 Service Manual page 122

...from previous page
Remove the Main digital board and
check the resistance to ground at
the Vias points which are the path
for the audio signals.
Is the measured
resistance below
Repair/Replace the
Terminal board.
The next pictures show the location of the Vias in the Main-Digital Board.
These Vias are the paths for the audio signals. Check the waveforms and/or the resistance at these Vias.
Digital Main Board,
B
19 Kohm?
No
Yes
Repair/Replace the
Digital Main board.
121
Points to check the
audio signal.
Vias 1 (Right)
Vias 2 (Left)