Read Sharp LL-T2010W (serv.man15) Service Manual online
LL-T2010W
TROUBLE SHOOTING
4 – 3
(No)
(Yes)
Are the waveforms of RN31~RN35
normal?
normal?
Is the positive side (no connection of
part) of C163 at DC+3.3V?
part) of C163 at DC+3.3V?
Is R213 at H level (DC+3.3V)?
When the LCD module is disconnected,
are the waveforms of RN31~RN35
normal?
are the waveforms of RN31~RN35
normal?
Replace the LCD module.
Check the DC+12V power line and fuse
F2.
F2.
Check the main PWB in the peripheral
of Q11, Q12, D20, and CN7, and check
the DC jack PWB.
of Q11, Q12, D20, and CN7, and check
the DC jack PWB.
Replace the inverter PWB unit.
Check the main PWB in the peripheral
of IC14, and check the DC jack PWB.
of IC14, and check the DC jack PWB.
Check the peripheral circuits of R203
and IC21.
and IC21.
Check the peripheral circuits of IC18.
(No)
(Yes)
Is the positive side of C164 at DC+12V?
(No)
(Yes)
Is CN11-20PIN at DC+3.3V?
Replace the LCD module.
(No)
(Yes)
Are 1PIN and 2PIN of CN3 on the DC jack
PWB at DC+12V?
PWB at DC+12V?
(No)
(Yes)
Is Cn7-5PIN at DC+5V?
(No)
(Yes)
Are test pins LD3 and LD4 at DC+2.5V or
less?
less?
(No)
(Yes)
Is 1PIN of CN2~CN7 on the inverter PWB
about 750Vrms? (Be careful of electric
shock. For voltage measurement, use a
high-voltage probe of 100:1 or more.)
about 750Vrms? (Be careful of electric
shock. For voltage measurement, use a
high-voltage probe of 100:1 or more.)
Check the lamp in the LCD module.
(Yes)
(Yes)
(No)
(No)
(No)
Check the peripheral circuits of FB16
and IC21.
and IC21.
Check Q10 and POWER_LINE signal.
Check the peripheral circuits of IC17.
(Yes)
(Yes)
(Yes)
Continued from
2
3
Check the DC+5V power line and the
IC19 peripheral circuits.
IC19 peripheral circuits.
Check the DC+3.3V power line and the
IC21 peripheral circuits.
IC21 peripheral circuits.
(No)
(Yes)
Is D21 cathode at DC+5V?
(No)
Is D23 cathode at DC+3.3V?
4
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