Repair Flow Chart - Philips ML1.2U LA Service Manual

90 ME5P 23"
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1.No Work/LED is off
Check if
power switch
is normal
Yes
Check the AC power
Yes
Check the power board connector
1089
Pin1.2=16V
Pin5=5V
Pin9=3.3V
2.No raster/picture
too dim
Check CN1 on
inverter board
pin1,2=16V
Yes
Check if 1001 on
scaler board
pin9=3.3V

Repair Flow Chart

No
Replace power switch
No
Replace AC power
Check working
voltage, backlight
No
control signal and
brightness control
signal on scaler board
No
Check IR board
3.No picture/LED
is green
Check if working voltage
pin17=3.3V of 7502
Yes
Check if clock source
1502,1731,1301
Yes
Check if scaler 7403
RGB,clk,H/V and
DE signal output
Yes
Check resistors-
network
Yes
Replace LVDS cable
No
Replace LCD panel
4.No D-Sub picture
Check if H/V
signals input to
schmitt trigger
7403
Yes
Check if schmitt
trigger 7403
output H/V signals
to JAGASM
Yes
Go to 3.No picture/LED is green
Check circuit around
No
each regulator and
eliminate short and
open situation
No
Replace 1502,1301,1731
Try to replace
CPU or CPU'Sflash Rom
No
CPU'S EEPROM
Painter
Painter's EEPROM
No
Replace bad resistors-
network
NO
Check input path
No
Replace 7403