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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= 35V swing
1.Symptom :
(with white pattern)
no picture
green LED on
2.Symptom :
no video (or dim),
only raster with/without retrace line
green LED on
check 7301 pin24
2V< ABL < 5V
check 7301
pin11 FLB
check
check 7301
No
7503 pin16
pin5 CLBL
3. Sympton :
no OSD or
OSD out of sync.
check
Ok
7304 pin12
Back
Repair Flow Chart (Continued)
check heater
check
=-6.1V
EHT=25KV
No
check Xray prot.
7503 pin2
check blanking
7503 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
7503 pin16
Ok
check
Ok
VG1 < -150V
check
VG2 > 350V
No
turn down Vg2
check 7701
pin8,9,11
input swing
Ok
replace 7701
check
check 7304
pin2 VCO
VFLB
pin3 RP
check 7304
pin5 HFLB
No
replace 7304
107P2 CM 25 GSIII
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
+80V/+180V
check 7701
pin 1,3, 5
output swing
check 7304
Ok
pin 7,8(IIC)
Forward
69
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