Read Sharp LL-T2015 Service Manual online
LL-T2015-B/H
TROUBLESHOOTING
4 – 2
(No)
(No)
(No)
(No)
(No)
(Yes)
(Yes)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(No)
(Yes)
(Yes)
(Yes)
(Yes)
(No)
(No)
The port from which the analog signal cable
was removed is the input signal port selected?
was removed is the input signal port selected?
16th pin and 19th pins of IC504 are in H level
(DC+3.3V)?
(DC+3.3V)?
LD505 and LD511 are in H level (about
DC+1.9V)?
DC+1.9V)?
LD803 is less than DC+1.0V at maximum
brightness?
brightness?
1st pin of CN2, CN3, CN4, CN5, CN6, and CN7
on inverter PWB unit is about 680 Vrms? (Use
caution not to get electric shock accident. Use
a high-voltage probe (more than 100:1) for
measuring voltage.)
on inverter PWB unit is about 680 Vrms? (Use
caution not to get electric shock accident. Use
a high-voltage probe (more than 100:1) for
measuring voltage.)
Check analog signal cable and CN101
(CN201).
(CN201).
Check SDA and SCL signals and circuits
around IC402 and IC502.
around IC402 and IC502.
Press INPUT key to switch over to the
correct input signal port.
correct input signal port.
When CN802 cable is removed, check the
LD805 is DC+18V.
LD805 is DC+18V.
Check inverter unit, inverter cable and their
connections.
connections.
Check the power unit and cable and their
connections, and DC+18V power supply
line.
connections, and DC+18V power supply
line.
Check BL_EN signal and circuits around
CN802.
CN802.
Check BRT_VR signal and circuits around
IC504.
IC504.
Signal waveforms of test terminals LD304,
LD305 (LD205, LD206) are normal?
LD305 (LD205, LD206) are normal?
Signal waveforms of test terminals LD309,
LD315 (LD308, LD316) are normal?
LD315 (LD308, LD316) are normal?
Signal waveforms of 31st and 32nd pins of
IC402 are normal?
IC402 are normal?
Check SW PWB and SW cable and their
connections.
connections.
16th pin of IC504 is in H level (DC+3.3V)?
continued from 1
LD505 is H in level (about DC+1.9V)?
Check SW PWB and SW cable and their
connections.
connections.
Test terminal LD805 is DC+18V?
LD802 is in H level (DC+17V)?
Check lamp inside LCD module.
Check circuits around IC502, IC504.
Check Q501 and its surrounding circuits.
Replace inverter PWB unit with a new one.
Check circuits around IC502, IC504.
Check Q501 and its surrounding circuit.
Check circuits around IC301 and IC302.
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3
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