Troubleshooting Charts - Polaroid FLM-3201 - 32" LCD TV Service Manual

Troubleshooting charts

1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
no
Check PIN7(12V output) of the
power supply board CN904
no
Check if it's melted of FUSE
in the power supply board?
no
Replacing power supply board
yes
Check the indicator in
turn-on condition
Non-change color
Replacing CPU board
Replacing U22, U27
20
blue
Check if the indicator is flicker
no
in the sensor control normal
condition?
yes
no
Check if the CN905 output
24V
yes
Check if the PIN26-30 of P4 is
high-level(5V)?
no
Check if it's melted of F3?
no no
Check if the B of Q7 is
high-level?
yes
no
Check if the pin 1, pin3 of U21
is high-level(5V)
yes
Replacing U21