Sharp LL-T1810A, Руководство по обслуживанию

Страница: 15 / 40

No
Yes No
No
No
No
No
No
No
Yes No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Digital color signal inputs and outputs of IC23 and IC27
are normal? (See waveform diagrams 13, 14 and 15.)
Check color signal processing circuit
around IC23 and IC27.
Check microprocessor control circuit
around IC27, IC28 and IC34.
LCD screen adjustment settings are
stored in memory properly? Check the memory circuit around the IC30
and IC34.
Inputs are switched over properly?
IC34 No.3 pins output signal normal?(The signal
is at H level for INPUT1 and at L level for INPUT2.)
Check microprocessor control circuit
around IC14 and IC34.
Check Dsub board, cable and CN5, 6.
LCD is normal.
Continued from the preceding page.
LCD screen color is abnormal?
Adjustment items of “GAIN CONTROL” and
“WHITE BALANCE” are set correctly?
Analog color signal outputs of IC 14 Nos. 25, 27, 30 and
35 pins are normal? (See waveform diagrams 10 and 11.)
Check video switch circuit around IC14.
Analog color signal outputs of No. 15 pins of IC 401, IC402
and IC403 are normal? (See waveform diagram 12.)
Check video amplifier circuit around IC401,
IC402, IC403 and IC28.
Digital color signal output of IC 23 is
normal? (See waveform diagram 13.)
Check AD converter circuit around IC23.
Digital color signal input and output of IC 27 is
correct? (See waveform diagrams 14 and 15.) Check color signal processing circuit
around IC27.
Digital color signal inputs and outputs of
IC8, IC9 and IC10 are normal? Check color signal processing circuit
around IC8, IC9 and IC0.
Check LCD connector and LCD module
OSD display of LCD screen is abnormal?
Signal outputs of IC31 Nos. 13, 15 and 17
pins are normal? (See waveform diagram 17.) Check OSD display circuit around IC31,
IC33 and IC34.
Check color signal processing circuit
around IC 27.
LCD screen is normal at composite syn.
and sync.-on-green? Check synchronous signal processing circuit
around IC18, IC19, IC21, IC22 and IC38.
GAIN CONTROL AUTO operates properly?
Adjust and set screen according to the
LCD screen setting procedure.
Yes
No
Yes
Yes
No
No
No
Yes