Philips 107T6, Service Manual

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107T6 CRT
R epair Flow C hart ( C ontinued)
88
B. Video
R epair Flow
R ough check for R , G, B
1 . Video input= 0 . 7 V
2. 7 33 1 Video output=2.5v
3. 7701 Video output>35V
1 . Symptom:
(with white pattern)
no picture
green LED on
C heck hearter
=+ 6 .3V
C heck
EH T =25KV
NO
C heck Xray prot.
780 4 Pin22
OK
C heck
VG 1 <- 1 5 0 V
OK
NO
C heck
R , G, B output
3 0 <2 7 22< 80
3 0 <2 7 23< 80
3 0 <2 7 24< 80
2. Symptom:
no video (or dim)
only raster with/without retrace line
green LED on
C heck 7 33 1 Pin22
2V<ABL<5V
C heck 7 33 1
Pin 7 , 6 , 5
input swing
C heck 7701
Pin 1 , 2, 4
input swing
C heck 7701
Pin 9, 10 , 11
output swing
OK
R eplace 7701
R eplace IF
cable
NO
C heck 7 33 1
Pin24 HFLB
OK
OK
R eplace 7 33 1
NO
C heck Vg 1
Vg 1 =-3 0 V
T urn down Vg2
C heck cathode
+ 8 3V
OK
OK
3. Symptom:
no OSD or
OSD out of Sync.
H.V. C heck 7 33 1
C heck HUNLO C K
780 4 Pin 7
C heck HUNLO C K
780 4 Pin 7
OK
C heck
VG2>45 0 V