Read Sharp LL-T1811W (serv.man3) Service Manual online
LL-T1811W
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+ side of C28 is DC+5 V?
Check areas around L10.
Test terminal LD21 changes its level when
POWER switch is turned on and off?
POWER switch is turned on and off?
Check MAINPW signal and areas
around CN5.
around CN5.
The output (connected to R35) of Q12
is in H level )DC+5 V)?
is in H level )DC+5 V)?
Check circuits around Q12.
21st pin of IC24 oscillates?
Check IC24 and clock circuit around X1.
C139-side terminal of X2 oscillates?
Check IC6 and clock circuit around X2.
Signal waveforms of test terminals LD58,
LD59 (LD51, LD52) are normal?
LD59 (LD51, LD52) are normal?
Check analog signal cable and
CN8 (CN6).
CN8 (CN6).
Signal waveform of test terminal
LD64 (LD65) is normal?
LD64 (LD65) is normal?
Check circuits around IC19 and IC33.
Signal waveforms of test terminals LD66
and LD67 are normal?
and LD67 are normal?
Check circuits around IC20.
Signal waveforms of test terminals LD24
and LD25 are normal?
and LD25 are normal?
Signal waveforms of test terminals LD22
and LD23 are normal?
and LD23 are normal?
Waveform at IC6 side is normal when
R70/R71 are removed?
R70/R71 are removed?
Replace IC6 with a new one.
Check DCLK and DEN lines.
Waveforms of FL1 FL4 are normal?
Waveform becomes normal when
LCD module is removed?
LCD module is removed?
Check areas around CN3.
Replace LCD module with a new one.
Signal waveforms of CN3s 66th, 70th,
65th, and 69th pins are normal?
65th, and 69th pins are normal?
Check areas around CN3.
Replace LCD module with a new one.
CN3 and CN4 1st and 2nd pins on
DC jack PWB are DC+12 V?
DC jack PWB are DC+12 V?
Check DC+12 V power supply line and
fuse F2.
fuse F2.
Test terminal LD5 is DC+5 V?
Check Q1, Q2, Q11, Q20 and main PWB
and DC jack PWB around CN2.
and DC jack PWB around CN2.
Test terminals LD3 and LD4 are less
than DC+1.0 V?
than DC+1.0 V?
Check main PWB and DC jack PWB
around IC5.
around IC5.
Replace inverter PWB unit with a new one.
Check lamp inside LCD module.
Check microprocessor circuit/GM5020.
5
Perform
CN2s 1st and 2nd pins on inverter PWB unit are about
750 Vrms?
(Use caution not to get electric shock accident. Use high-
voltage probe (more than 100:1) for measuring voltage.)
750 Vrms?
(Use caution not to get electric shock accident. Use high-
voltage probe (more than 100:1) for measuring voltage.)
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