Hitachi P50H401 Service Manual page 120

...from four pages back
B
Remove the Main digital board and
check the resistance to ground at
the next points:
-Before RL69
-Before RL67
-Before RL66.
Does resistance
check result in less
than 1Mohm?
Repair/Replace the
Terminal board.
Digital Main Board
No
Yes
119
PMS1
(160p connector)
QL64 RL69
QL62 RL67
QL61 RL66
Repair/Replace the
Digital Main board.
DMM
Ω
- +