Philips 26MF231D/37, Service Manual

Page: 90 / 102

90
TPE1.0U LA
9. Trouble Shooting
9.4 Repair Flow Chart
1.No work/LED is off
Check if
power switch is
normal
No
Replace Power switch
Yes
Check
power board 1089
pin1,2=16V,pin3=24V,
pin4=1.8V,pin5=
4.6V
2.No raster/picture too
dim
Check
power board 1088,
pin1~5=24V,pin6=
2.6V pin7=6.1V
No
Check power board
Check power board
Yes
Check scaler board1503
pin1=7V,pin3=5.2V,
pin4=4.9V,pin5=7.6V,
pin6=4.8V
No
Yes
Check
power board 1089
pin1,2=16V,pin3=24V,
pin4=2.6V,pin5=
6.1V
Check power board
Yes
Check scaler board
No
3.No picture/LED is green
Check
power board 1088,
pin1~5=24V,pin6=
2.6V pin7=6.1V
No
Check power board
Yes
Check if
working voltage
3Q03=3.3V,3Q27
=3.3V
No
Check circuit around
each regulator and
eliminate short and
open situation
Yes
Check if clock
source 1H00
Replace 1H00
No
Yes
Check if
7J00 RGB,
clk,H/V and DE signal
output 128 bits
TTL
No
Try to replace
flash Rom
EEPROM
Check
resistors-network
No
Replace bad resistors-
network
Yes
Yes
Replace LVDS cable
Yes
Replace LCD panel
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