Troubleshooting Charts - Polaroid FLM 3701 - 37" LCD TV Service Manual

Troubleshooting
1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
no
Check PIN3(5V output) of the
power supply board C3
no
Check if it's melted of FUSE
in the power supply board?
no
Replacing power supply board
charts
yes
Check the indicator in
turn-on condition
Non-change color
Replacing CPU board
Replacing U22
no
no
no
no
no
21
blue
Check if the indicator is flicker
in the sensor control normal
condition?
yes
Check if the CN2 output 24V
yes
yes
Check if the PIN1 of P29 is
high-level(5V)?
yes
Check if the PIN26-30 of P4 is
high-level(5V)?
no
Check if it's melted of F3?
no
Check if the B of Q7 is
high-level?
yes
Check if the pin 1, pin3 of U21
is high-level(5V)
yes
Replacing U21