Read Sharp LL-T2000 (serv.man4) Service Manual online
LL-T2000A
3 – 3
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<Screen is abnormal>
Test terminal LD65 is DC+5 V?
Check DC+5V power supply lines (DVCC,
AVCC) and power supply circuit around IC15.
AVCC) and power supply circuit around IC15.
Test terminal LD64 is DC+3.3 V?
Check DC+3.3 V power supply line (DV33)
and power supply circuit around IC14.
and power supply circuit around IC14.
The entire LCD screen is blank (white)?
Lock LD27 and DE LD28 signal outputs
are normal?
are normal?
Check circuit around X1, X2, IC10, IC11.
Check IC13, IC22, and LCD connector,
LCD module.
LCD module.
The entire LCD screen is black?
Test terminal LD63 signal is in H level
(DC+5V)?
(DC+5V)?
Check main PWB around Q8 and CN9
and DC jack PWB.
and DC jack PWB.
Check circuit around X1, X2, IC10, IC11.
LCD screen size is abnormal?
ADJUSTMENT and MODE SELECT
are set correctly?
are set correctly?
Adjust according to the screen
adjustment procedure.
adjustment procedure.
Test terminal LD18 output signal is
normal?
normal?
Check PLL circuit around IC4.
Check circuits around IC1.
LCD screen jitters or flickers?
ADJUSTMENT and MODE SELECT
are set correctly?
are set correctly?
Adjust according to the screen
adjustment procedure.
adjustment procedure.
Check circuits around IC2, IC3 and IC4.
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