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Trouble shooting guide
1.No raster, no picture, no sound
Check power supply
D3.3V, D5V
Abnormal
Measure the level of 8
when use V4 screen, it should be low
level; when use V7 screen, it should
be high level.
Normal
Abnormal
Check the level
of power supply
pin of each IC.
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.
No raster, no picture, no sound.
Check if the power supply indicator light is on.
yes
Normal
th
pin of X405:
Check N401
no
Check
if
the
union
joint
of
N602 and LVDS
line is loose.
23
Check 5V-STBY
Cut off the connection
between
power
board and data board, and
test 5V-STBY
Abnormal
Check
N401
The problem of
and keyboard.
power supplies
board.
supply
Normal
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