Read Sharp LL-T2000 (serv.man4) Service Manual online
LL-T2000A
3 – 2
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continued from preceding page
Test terminals LD15, LD78, LD81 signal
inputs are normal?
inputs are normal?
Check synchronizing signal processing
circuit around IC2, IC3, IC4 and IC24.
circuit around IC2, IC3, IC4 and IC24.
Test terminal LD49 signal output is
normal?
normal?
Check areas around Q4.
Test terminal LD52 signal output is
normal?
normal?
Check areas around Q3.
Check SW PWB (LED and cable).
<Error occurs in power save mode>
The voltage at both ends of fuse F1 is
DC+ 0 V?
DC+ 0 V?
Check LCDPW signal and areas
around Q5.
around Q5.
Test terminal LD49 signal output is
normal?
normal?
Check areas around Q4.
Test terminal LD52 signal output is
normal?
normal?
Check areas around Q3.
Check SW PWB (LED and cable).
<Backlight goes out abnormally>
DC jack PWB CN3, CN4 1st and 2nd
pins are DC +12V?
pins are DC +12V?
Check DC+12 power supply line and
fuse F2.
fuse F2.
Test terminal LD63 is in H level
(DC+5 V)?
(DC+5 V)?
Check main PWB around Q8 and CN9
and DC jack PWB.
and DC jack PWB.
Test terminals LD61 and LD62 are less
than 1.0 V when brightness is maximum
(OSD display BRIGHT 31)?
than 1.0 V when brightness is maximum
(OSD display BRIGHT 31)?
Check areas around IC12 and
DC jack PWB.
DC jack PWB.
Check inverter PWB unit.
Check LCD module lamp.
Inverter PWB unit CN2 1st and 2nd pins
are at about 800 Vrms?
(Use caution not to get electric shock
accident. Use a high-voltage probe
(more than 100:1) for measuring voltage.)
are at about 800 Vrms?
(Use caution not to get electric shock
accident. Use a high-voltage probe
(more than 100:1) for measuring voltage.)
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