Repair Flow Chart (Continued)
B.Video
Repair Flow
check 7301
pin20 HFLB
1.Sympton :
(with white pattern)
no picture
green LED on
check
EHT=25KV
rough check for R,G, B
1. video input= 0.7V
2. 7301video output =2.5V
3. 7701 video output > 35Vpp
check 7301
pin19 CLBL
check DC restoration
7722,7732,7752
7721,7731,7751
check 7301 pin22
2V< ABL < 5V
check 7301
pin 6,8,10
input swing
check 7701
pin 6, 7,9
input swing
Ok
replace 7701
Ok
replace IF
cable
No
replace 7301
check
VG1 < -150V
Ok
No
check blanking
7501 pin16
check heater
= + 6.3V
Ok
check Xray prot.
7501 pin2
No
check
R,G,B output
30<2725<80
30<2733<80
30<2753<80
Ok
2.Sympton :
no video (or dim),
only raster with/without retrace line
green LED on
check Vg1
Vg1 = -30V
check cathod
+83V,3759
Ok
check blanking
7501 pin16
No
turn down Vg2
check 7701
pin 9,10,11
output swing
check
7304 pin10
VFLB
3. Sympton :
no OSD or
OSD out of sync.
check 7301
pin 8,9,10 input
check
7301 pin11
check 7304
pin2 VCO
pin3 RP
check 7304
pin5 HFLB
replace 7301
Ok
No
replace 7304
No
check 7304
pin 7,8(IIC)
check
7501 pin16
Ok
No
check
VG2 > 450V
Ok
No
check
7304 pin12
Ok
9
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M32 107T4 GS_3
47