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202P7 CRT
31
Repair Flow Chart (Continued)
B. Video
Repair Flow
Rough check for R, G, B
1. Video input=0.7V
2. 7701 Video output=3.4V
3. Video output>35V
1. Symptom:
(with white pattern)
no picture
green LED on
Check hearter
=+6.3V
Check
EHT=25KV
OK
Check
VG1<-150V
NO
Check
R, G, B output
30<2706<80
30<2726<80
30<2746<80
2. Symptom:
no video (or dim)
only raster with/without retrace line
green LED on
Check 7701
Pin 6, 8, 10
input swing
Check 7701
Pin 16, 19, 22
output swing
OK
Replace 7701
NO
Check Vg1
Vg1=-30V
Turn down Vg2
Check cathode
+83V
OK
3. Symptom:
no OSD or
OSD out of Sync.
H.V. Check 7701
Check HUNLOCK
7421 Pin17
OK
Check
VG2>450V
Содержание 202P70/00
Страница 37: ...37 202P7 CRT Go to cover page Wiring Diagram ...
Страница 40: ...40 Main Schematic Diagram Go to cover page 202P7 CRT C1 224V C2 C3 224V C4 C5 C6 C7 C8 C9 C13 C12 C11 C10 101V ...
Страница 41: ...41 202P7 CRT Go to cover page Main Board C B A 1 ...
Страница 42: ...42 Main Board C B A 2 Go to cover page 202P7 CRT ...
Страница 44: ...44 Go to cover page Video Board C B A 1 202P7 CRT ...
Страница 45: ...45 202P7 CRT Go to cover page Video Board C B A 2 ...
Страница 47: ...47 202P7 CRT Go to cover page TERMINAL Board C B A 1 ...
Страница 48: ...48 TERMINAL Board C B A 2 Go to cover page 202P7 CRT ...
Страница 50: ...50 Driver Board C B A Go to cover page 202P7 CRT ...
Страница 51: ...51 202P7 CRT Go to cover page KEY CONTROL Schematic Diagram C B A ...
Страница 52: ...52 MHR Schematic Diagram C B A Go to cover page 202P7 CRT ...