Repair Flow Chart - Philips 109P2 CM25 GSIII Service Manual

rough check for R, G, B
B.Video 1. video input= 0.7V
Repair Flow 2. 7701video output =2.5V
3. 7705 video output= 35V swing
1.Sympton :
(with white pattern)
no picture
green LED on
2.Sympton :
no video (or dim),
only raster with/without retrace line
green LED on
check 7701 pin24
check
No
7421 pin16
3. Sympton :
no OSD or
OSD out of sync.
check
7781 pin12
Back

Repair Flow Chart

check heater check
= 6.3V EHT~25KV
No
check Xray prot.
7651 pin14
check blanking
7421 pin16
Ok
check Vg1
Vg1 = 0V
check 7701
Ok pin 6,8,10
2V< ABL < 5V
input swing
No
replace IF
check 7701
cable
pin11 HFLB
check 7701
Ok replace 7701
pin5 CLBL
check 7701
No 7781 pin10
pin 2,3,4 input
Ok
check
Ok
7701 pin1
No
replace 7701
check blanking
7421 pin16
Ok
check
Ok
VG1 < -190V
check
VG2 > 350V
No turn down Vg2
check 7705
pin8,9,11
input swing
No
replace 7705
check check 7781
pin2 VCO
VFLB pin3 RP
check 7781
pin5 HFLB
No
replace 7781
109P2 GS3 CM25
9
Go to cover page
No
check DC restoration
7707,7727,7747
7706,7726,7746
check cathode
+80V/+180V
check 7705
pin 1,3, 5
output swing
check 7781
Ok
pin 7,8(IIC)
Forward
41