Sanyo PDP-42XS1 - No Raster, no Picture, no Sound; Trouble Shooting Guide

21
Trouble shooting guide
1.No raster, no picture, no sound
NOTICE: The PDP power supply have the protection function of overcurrent, overvoltage and so
on, if certain route power supply appear overcurrent and overvoltage, the power supply should
appear the protection to arise no-output.
Check if the power supply indicator light is on.
Check 5V-STBY
Cut off the connectio
n
b
etween power supply boar
d
and digital signal processing
board, and test 5V-STBY
Check
p
owe
r
supply board
Check the digital signal
p
rocessing and analo
g
signal processing board
After turn on the unit, chec
k
if the blue is normal.
Check if the blue and re
d
indicator is normal.
N
502 is
Abnormal
Check the unio
n
j
oin
t
of the powe
r
supply board to
LVDS line.
Check if the pin2 o
f
X902 is hi
g
h level.
N
o raster, no picture, no sound.
Red indicator is on
N
ormal
Red indicator is off
Abnormal
There are on There are off Abnormal
N
ormal
N
502 is
Abnormal
Abnormal
N
ormal
Check
N
501
Check if the pin6
of X902 is +5V.
N
ormal
Abnormal
Check if N501
and +5V-PANE
L
is short circuit.
Check the powe
r
su
pp
l
y
boar
d