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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 pin24
2V< ABL < 5V
check 7301
pin11 HFLB
check
check 7301
No
7501 pin16
pin5 CLBL
3. Sympton :
no OSD or
OSD out of sync.
check
Ok
7304 pin12
Back
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Repair Flow Chart
check heater
check
= - 6.3V
EHT=25KV
No
check Xray prot.
7501 pin2
check blanking
7501 pin16
Ok
check Vg1
Vg1 = 0V
check 7301
Ok
pin 6,8,10
input swing
No
replace IF
cable
Ok
replace 7301
check 7301
No
7304 pin10
pin 2,3,4 input
Ok
check
7301 pin1
No
replace 7301
check blanking
7501 pin16
Ok
check
Ok
VG1 < -150V
check
VG2 > 450V
No
turn down Vg2
check 7701
pin 6, 7,9
input swing
Ok
replace 7701
check
check 7304
pin2 VCO
VFLB
pin3 RP
check 7304
pin5 HFLB
No
replace 7304
107S2 CM23 GSIII
39
9
Go to cover page
check
R,G,B output
No
30<2725<80
30<2733<80
30<2753<80
Ok
check DC restoration
7722,7732,7752
7721,7731,7751
check cathod
+78V,3779
check 7701
pin 1,2,3
output swing
check 7304
Ok
pin 7,8(IIC)
Forward
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