LC-28HM2E (serv.man2). text - Sharp TV Service Manual (repair manual). Page 46

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46
LC-28HM2
AN-28SP2
TROUBLE SHOOTING TABLE
 (Continued)
No color
Ye
s
No
No
No
No
No
No
No
No
No
No color production of video line and component 
line signals
Ye
s
Is 3.58MHz supplied to 
pin (10) of IC801?
Check X801 and its 
peripherals.
Ye
s
Are there normal 
outputs at pins (3) and 
(6) of IC406?
Check the peripherals 
of IC7001 and IC7002.
Ye
s
Ye
s
Ye
s
Is there normal input at 
pin (13) of IC801?
Check the peripherals 
of IC801 and IC7003.
No
Are there normal outputs at 
pins (5) and (6) of IC801?
Check input and output of IC406.
Check the peripherals 
of IC801.
Check the peripherals.
Ye
s
Are there normal inputs 
at pins (51) and (52), 
and normal outputs at 
pins (42), (42) and (43) 
of IC801?
Check IC801 and its 
peripherals.
Are there normal inputs 
at pins (1), (5) and (9), 
and normal outputs at 
pins (3), (7) and (11) of 
P803?
Check RGB filter unit 
unit (KA266N).
No color production of video line signals
(Commonly supplied between IC401 and IC801.)
Is there normal output at pin (83) of IC7001?
Ye
s
Ye
s
Ye
s
Is there normal output 
at pin (53) of IC401?
Check IC401 and the 
peripherals of IC802.
Check the line from rear terminal unit in 
the case of V1(S), and the line from front 
terminal board in the case of V2(S).
No color production only 
with video S signals
Is there normal output 
at pin (58) of IC401?
Is there normal input at 
pin (5) or (12) of IC401?
Ye
s
No color production of component line signals
Ye
s
Are there normal inputs 
at pins (4), (7) and (9) 
of IC416 and IC417?
Check the related part 
of the rear terminal 
unit.
Ye
s
Is there normal output 
at pin (8) of IC416 and 
IC417?
Check IC416, IC417 
and the peripherals of 
IC404 and IC405.
Ye
s
Video signals are properly 
supplied to SC503, but no 
color production.
Check if "Monochrome" 
setting is in effect.
The term "video composite" denotes video 1, video 2 and video 3 signals.
The term "video S" denotes video 1 (S video input) and video 2 (S video input) signals.
The term "video line" denotes the aggregate of "video composite" and "video S" signals.
The term "component line" denotes component 1 and component 2 signals.
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