Prima PS-42T8, Service Manual

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2.With sound but no picture:
Set self-testing of the screen:
a. 42” SD screen: Push down 2 and 4 and push up 3 of SW2001 on the logic board;
b. 50” HD screen: Push down 1 and 4 and push up 2, 3, 5, and 6 of SW2001 on the logic board;
c. Please make sure resume it to the original status when the check is over.
With sound but no picture.
Display logo?
Check if all other channel
has no picture.
N602 PW118
and periphery
circuit
Turn to check 4
of program
Check if the G401 and
G7000 have the signal
wave.
Unfix X405 and X406, short
circuit the PIN8 of X405 to GND,
set switch of the logic board as
self-testing signal, then check if
display the white screen.
Check the input signal of N602
and power supply.
The screen damaged.
N602 damaged.
Check N700
and the circuit
of output.
Yes No
No
Yes
Normal
Normal Abnormal
Abnormal
Abnormal Normal