Prima PH50D8, Service Manual

Page: 23 / 46

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2
1 -
Short circuit the pin 8 (PS-ON) of
X709 to the ground, then check
power
Diagram of Normal Trouble Shooting
1
．
“Three no”, i.e., no raster, no picture and not sound:
If power indication lamp is lit
yes no
normal
normal abnormal normal
JI
Normal abnormal
normal
Note:Power supply for PDP is provided with over current and over voltage protection functions.
If there is over current or over voltage, this protection will function and no output.
Three no
check5V-STBY
Cutoff the connection
between power board and
signal process,
check5V-STB
Cutoff the connection x2
between main board and
video process. Board, then
determine which board is
abnormal
Power board
problem
Check power esp.
D3.3V
N501abno
rmal
Check supply,
crystal oscillation
for N501andN601
Pull out X709
check power
Check N501and
N601
Check supply for
N102,N204,N302,N403,crystal
oscillation and bus line
Short circuit in
a power line
Power board
problem
abnormal