Abnormal Video On Crt Screen - Tatung OMNISCAN SERIES Service Manual

6.12 ABNORMAL VIDEO ON CRT SCREEN
(TOO
BRIGHT OR TOO DARK)
CHECK R, G, B
VIDEO OUTPUT
I
I
I
I
CHECK 6V
I
I
I
I
I
I
10K
I
I
CHECK Gl - - - - - - -
VOLTAGE
I
I
I
I
I
I
10K
I
I
NG
NG
, - - - - - - >
MEASURE ON THE VIDEO PCB
PWB-1697
PIN 1 OF P002, P062, P122
>
PIN 2 OF POlO
) 0315, 0207, R204, R206
(PWB-1701) FAILURE
>
Gl OF PWB-1643
(-50V TO -100V)
) 0901, VR907, 0903 TO 0908 (PWB-1643)
R635, 0614 (PWB-1701A)
FAILURE
CHECK VIDEO AMP
----------------------->
PWB-1697
I
SEE ITEM R9
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I
I
CHECK 12V
----------------------------->
LOW OR OV. SEE ITEM 6.30
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I
73V CONNECTOR P009, POlO
10K
I
CHECK SCREEN
VOLTAGE
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I
I
I
I
I
I
I
I
END
FAILURE
>
TOO LOW
SCREEN UNIT C901, R905
T603, CRT, FAILURE
, - - - - - - - - : ) 300 - 700V, CRT FAILURE
=
6-12
=