Polaroid FLM 3701 - 37" LCD TV Service Manual page 25

2. raster, but no picture
Check if the unit
yes
can operation?
no
no
Replacing
CPU board
no
Replacing
U30
yes
Replacing
N1
Replacing U13
Check if
channels have signal?
Enter factory-menu,
operation CLEAR
EEPROM, then turn
off , turn on again , it if
display picture.
yes
Adjust CPU board
again
Testing
yes
PIN65 of
U30 SYNC
signal
no
Replacing CPU board
no
the all
Which is no
signal
channels
YPRPB
Testing
supply (+12V) of
video processing
board
Display
"NO-SIGNAL"
no
Testing
1VPP signal
of TP1,
Check if PIN2
TP2, TP3.
1VPP
and noise wave
yes
of P32?
Check if PIN56
yes
15.734KHz
sync signal of
U29?
Replacing U29
22
VGA/DVI Replacing CPU
of board
TV
no
power Replacing power
supply board
yes
no
signal
yes
no
Replacing
TUNER01