Repair Flow Chart (Continued)
B.Video
Repair Flow
check 7331
Pin11 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 DC restoration
7722,7732,7752
7721,7731,7751
check 7331 pin24
2V< ABL < 5V
check 7301
pin 6,8,10
input swing
check 7701
pin 6,7,9
input swing
Ok
Ok
replace 7701
Check 7304
pin7,8(IC)
Check
7304 pin12
Ok
replace IF
replace 7304
replace 7301
cable
No
No
No
replace 7301
check
VG1 < -150V
Ok
No
check blanking
7501 pin3
check heater
= + 6.3V
Ok
Ok
check Xray prot.
7501 pin25
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 = 0V
check cathod
Check
7301 pin1
+83V,
Ok
check blanking
7501 pin3
No
No
turn down Vg2
check 7701
pin 1,2,3
output swing
3. Sympton :
no OSD or
OSD out of sync.
check 7301
pin2,3,4 input
Check
7304 pin10
VFLB
check 7304
pin2 VCO
pin3 RP
check 7304
pin5 HFLB
check
VG2 > 450V
Ok
V40 107P5
32
Ok
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Содержание V40 107P5
Страница 7: ...9 Go to cover page 7 V40 107P5 Wiring Diagram http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Страница 23: ...C B A Of Video Board 23 9 Go to cover page V40 107P5 http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Страница 26: ...26 V40 107P5 9 Go to cover page C B A Of Main Panel http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...
Страница 27: ...C B A of Main Board 27 9 Go to cover page V40 107P5 http jdwxzlw 5d6d com fromuser 华盛维修 家电维修资料网 免费下载各种维修资料 ...