Repair Flow Chart - Philips 20TA1000/93 Service Manual

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1.No Work/LED is off
Check if
power switch
is normal
Yes
Check if AC
adaptor output
=16V
Yes
Check the inverter board
2.No raster/picture
too dim
Check if 1001 on
scaler board
pin1,2,3=16V
pin 5=0~4.7V
Yes
Check if 1302 on
scaler board
pin3=3.3V
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Repair Flow Chart

No
Replace power switch
No
Replace power adaptor
NVNVr× R 6O\ ÿ N% y • • l • }
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
pin3=3.3V of 7303
3307=3.3V 3313=5V
1304 Pin1=5V
Check if clock source
1401,1301,1621
Yes
Check if scaler 7401
RGB,clk,H/V and
DE signal output
48 bits TTL
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
7201
Yes
Check if schmitt
trigger 7201
output H/V signals
to JAGASM
Yes
Go to 3.No picture/LED is green
TPF1.3A LA
Check circuit around
No
each regulator and
eliminate short and
open situation
No
Replace 1401,1301,1621
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 7201
73