Philips 107T60 - Page 88

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107T6 CRT
Repair Flow Chart (Continued)
88
B. Video
Repair Flow
Rough check for R,G,B
1. Video input=0.7V
2. 7331 Video output=2.5v
3. 7701 Video output>35V
1. Symptom:
(with white pattern)
no picture
green LED on
Check hearter
=+6.3V
Check
EHT=25KV
NO
Check Xray prot.
7804 Pin22
OK
Check
VG1<-150V
OK
NO
Check
R, G, B output
30<2722<80
30<2723<80
30<2724<80
2. Symptom:
no video (or dim)
only raster with/without retrace line
green LED on
Check 7331 Pin22
2V<ABL<5V
Check 7331
Pin 7, 6,5
input swing
Check 7701
Pin 1,2,4
input swing
Check 7701
Pin 9, 10, 11
output swing
OK
Replace 7701
Replace IF
cable
NO
Check 7331
Pin24 HFLB
OK
OK
Replace 7331
NO
Check Vg1
Vg1=-30V
Turn down Vg2
Check cathode
+83V
OK
OK
3. Symptom:
no OSD or
OSD out of Sync.
H.V. Check 7331
Check HUNLOCK
7804 Pin7
Check HUNLOCK
7804 Pin7
OK
Check
VG2>450V