Read Sharp LL-T1810A (serv.man2) Service Manual online
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Continued from the preceding page.
IC34 No. 51 pins signal output is at H level
(DC+5V)?
(DC+5V)?
IC34 No. 52 pins signal output is at L level
(0V)?
(0V)?
Check circuits around (LED, cable, etc.).
Check the microprocessor control circuits
around IC29 and IC34.
around IC29 and IC34.
Check the microprocessor control circuits
around IC29 and IC34.
around IC29 and IC34.
< An error occurs in power save mode >
IC34 No. 56 pins signal output is at t L level
(0V)?
(0V)?
Check microprocessor control circuits
around IC28 and IC34.
around IC28 and IC34.
IC34 Nos. 51 and 52 pins signal outputs
show H level (DC+5V)?
show H level (DC+5V)?
Check circuits around LED (operation
board, cable, etc.).
board, cable, etc.).
Check microprocessor control circuits
around IC28 and IC34.
around IC28 and IC34.
< Back light goes out improperly>
No.1 pins of CN1 and CN2 show DC+12V?
Check DC+12V power supply line and
power supply circuit around fuses F1 and F2.
power supply circuit around fuses F1 and F2.
No.4 pins of CN1 and CN2 show DC+5V?
Check inverter board unit and cable.
IC34 No. 55 pins signal output is at the
H level (DC+5V)?
H level (DC+5V)?
Check microprocessor control circuit
around IC29 and IC34.
around IC29 and IC34.
Test terminal TP1 shows DC+11V?
Check DC+11V power supply line (+11V)
and power supply circuit around IC1.
and power supply circuit around IC1.
IC34 No. 54 pins signal output is at the
L level (0V)?
L level (0V)?
No. 5 pins of the CN1 and CN2 show
DC+5V?
DC+5V?
No. 3 pin of CN1 and CN2 shows 0 V when
brightness is maximum (OSD display, BRIGHT 31)?.
brightness is maximum (OSD display, BRIGHT 31)?.
Check circuit around operation board
(operation board, cable, etc.)
(operation board, cable, etc.)
Check inverter board unit.
Check light in LCD module.
Nos. 1 and 2 pins of CN2 on inverter
board unit show approx. 1800 Vrms?
(Use caution to avoid an electrical shock!
Use a high-voltage probe (more than
100:1) for measuring voltage.)
board unit show approx. 1800 Vrms?
(Use caution to avoid an electrical shock!
Use a high-voltage probe (more than
100:1) for measuring voltage.)
Check microprocessor control circuit
around IC29 and IC34.
around IC29 and IC34.
Check DC+11V power supply line (+11V)
and power supply circuit around IC1.
and power supply circuit around IC1.
Click on the first or last page to see other LL-T1810A (serv.man2) service manuals if exist.