Philips 107T60 Service Manual page 88

88
107T6 CRT
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B. Video
Repair Flow
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
3. Symptom:
no OSD or
OSD out of Sync.
Repair Flow Chart (Continued)
Rough check for R, G, B
1. Video input=0.7V
2. 7331 Video output=2.5v
3. 7701 Video output>35V
Check hearter
=+6.3V
Check 7331 Pin22
OK
2V<ABL<5V
OK
Check 7331
Pin24 HFLB
OK
Replace 7331
H.V. Check 7331
Check
OK
EHT=25KV
NO
Check Xray prot.
7804 Pin22
Check HUNLOCK
7804 Pin7
OK
Check Vg1
Turn down Vg2
NO
Vg1=-30V
Check 7331
Pin 7, 6, 5
input swing
NO
Replace IF
cable
Check HUNLOCK
7804 Pin7
OK
Check
NO
VG1<-150V
Check cathode
+83V
Check 7701
Check 7701
Pin 1, 2, 4
Pin 9, 10, 11
input swing
output swing
OK
Replace 7701
Check
R, G, B output
30<2722<80
30<2723<80
30<2724<80
OK
Check
VG2>450V