SHARP LC-28HM2 Repair Manual

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