Philips M32 107E4 GS 3 Service Manual page 50

M32 107E4 GS_3
46
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rough check for R,G, B
B.Video 1. video input= 0.7V
Repair Flow 2. 7301video output =2.5V
3. 7701 video output > 35Vpp
1.Sympton :
(with wite pattern)
no picture
green LED on
2.Sympton :
no video (or dim),
only raster with/without retrace line
green LED on
check 7301 pin22
2V< ABL < 5V
check
No
7501 pin16
3. Sympton :
no OSD or
OSD out of sync.
check
7304 pin12
Repair Flow Chart (Continued)
check heater
= + 6.3V EHT=25KV
check Xray prot.
7501 pin2
check blanking
7501 pin16
check Vg1
Vg1 = -30V
check 7301
Ok pin 6,8,10
input swing
replace IF
check 7301
pin20 HFLB
check 7301
Ok replace 7301
pin19 CLBL
check 7301
No
pin 8,9,10 input
Ok
check
Ok
7301 pin11
No
replace 7301
check blanking
7501 pin16
check check
Ok
VG1 < -150V
No
check
VG2 > 450V
Ok
No turn down Vg2
check 7701
pin 6, 7,9
input swing
No Ok
replace 7701
cable
check check 7304
7304 pin10 pin2 VCO
VFLB pin3 RP
check 7304
pin5 HFLB
replace 7304
Ok
check
R,G,B output
No 30<2725<80
30<2733<80
30<2753<80
check DC restoration
7722,7732,7752
7721,7731,7751
check cathod
+83V,3759
check 7701
pin 9,10,11
output swing
check 7304
Ok
pin 7,8(IIC)
No
Ok