Read Sharp LL-T1810A (serv.man10) Service Manual online
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<Screen is not normal >
Test terminal TP3 shows DC+5V?
Check DC+5V power supply line (VCC and
ADVCC) and power supply circuit around IC5.
ADVCC) and power supply circuit around IC5.
IC25 No. 1 pin shows DC+5V?
Check DC+5V power supply line for PLL
and power supply circuit around the IC24.
and power supply circuit around the IC24.
Test terminal TP5 shows DC+3.3V?
Check DC+3.3V power supply line (LVCC)
and power supply circuit around IC7.
and power supply circuit around IC7.
Entire screen of LCD display remains
white?
white?
Signal outputs of clocks FL3, FL4, DE FL2 and FL5
are normal? (See waveform diagrams 6 and 7.)
are normal? (See waveform diagrams 6 and 7.)
Check LCD control signal circuit around
OSC1, OSC2, IC26, IC27 and IC35.
OSC1, OSC2, IC26, IC27 and IC35.
Check LCD connector and LCD module.
Entire screen of LCD display remains
black?
black?
IC34 No. 56 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.
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Check LCD control signal circuit around
IC26 and IC27.
IC26 and IC27.
LCD screen size is abnormal?
Adjustment items of “ADJUSTMENT” and
“MODE SELECT” are set correctly?
“MODE SELECT” are set correctly?
Adjust and set screen according to the
LCD screen setting procedure.
LCD screen setting procedure.
Signal outputs of IC 25 No. 24 pin and IC23 No. 8
pin are normal? (See waveform diagrams 8 and 9.)
pin are normal? (See waveform diagrams 8 and 9.)
Check PLL circuit around IC23, IC25 and
IC34.
IC34.
LCD screen trembles or flickers?
Check PLL circuit around IC23, IC25 and
IC34.
IC34.
Continued on the next page.
Adjust and set screen according to the
LCD screen setting procedure.
LCD screen setting procedure.
Adjustment items of “ADJUSTMENT” and
“MODE SELECT” are set correctly?
“MODE SELECT” are set correctly?
Check LCD control signal circuit around
IC26 and IC27.
IC26 and IC27.
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