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2.With sound but no picture:
Check if all other channel
has no picture.
No
N602 PW2300
and
periphery
circuit
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?
Yes
Check if the G401 and
G7000 have the signal
Yes
wave.
Turn to check 4
of program
Abnormal
Check the input signal of N602
and power supply.
Normal
N602 damaged.
No
Unfix X405 and X406, short
Normal
circuit the PIN8 of X405 to GND,
set switch of the logic board as
self-testing signal, then check if
display the white screen.
Normal
Abnormal
Check
N700
and the circuit
of output.
24
Abnormal
The screen damaged.
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