Read Sharp LL-T1810A (serv.man10) Service Manual online
CHAPTER 3. TROUBLE SHOOTING
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Check and remedy any failure according to
the following procedure.
the following procedure.
LED color changes in color from orange to
green by pressing power switch?
green by pressing power switch?
See
<An error occurs when
synchronous signal is detected.>
LED comes on in orange soon after RGB
cable is removed?
cable is removed?
See
< An error occurs in power
save mode>.
Back light turn on when RGB cable is
connected?
connected?
See
<Back light goes out
improperly>.
Screen is normal in each video mode?
See
<Screen is not normal>.
No failure.
< An error occurs when synchronous signal is detected.>
Input signal port is the port to which RGB
cable is connected?
cable is connected?
Press INPUT key to switch over input
signal port to the correct one.
signal port to the correct one.
DC+12V is output from the dedicated
AC adapter?
AC adapter?
Check dedicated AC adapter.
Test terminal TP8 shows DC+12V?
Check DC+12V power supply line and power
supply circuit around fuse (DC jack board).
supply circuit around fuse (DC jack board).
Test terminal TP4 shows DC+5V?
Check DC+5V power supply line (MVCC)
and power supply circuit around the IC4.
and power supply circuit around the IC4.
IC34 No. 19 pins signal input is at H level
(DC+5V)?
(DC+5V)?
Check RESET circuit around IC29.
IC34 No. 22 pins signal input is normal?
(See waveform diagram 1.)
(See waveform diagram 1.)
Check clock circuit around IC34 and X1.
IC34 No. 55 pins signal output is at H level
(DC+5V)?
(DC+5V)?
Check the microprocessor control circuits
around IC29 and IC34.
around IC29 and IC34.
Test terminal TP2 shows DC+5V?
Check DC+5V power supply line (BVCC)
and power supply circuit around IC6.
and power supply circuit around IC6.
Test terminal TP6 show sDC+5V?
Check DC+5V power supply line (ANVCC)
and power supply circuit around IC15.
and power supply circuit around IC15.
IC 24 Nos. 8, 9, 17 and 18 pins signal outputs
are normal? (See waveform diagrams 2 and 3)
are normal? (See waveform diagrams 2 and 3)
Check Dsub board, cable and CN5,6.
IC34 Nos 6 and 7 pins signal inputs are
normal? (See waveform diagrams 4 and 5.)
normal? (See waveform diagrams 4 and 5.)
Check signal processing circuit around IC14,
IC17, IC18, IC21, IC38, IC500, IC501 and IC503.
IC17, IC18, IC21, IC38, IC500, IC501 and IC503.
IC34 No. 58 pins signal output is at H level
(DC+5V)?
(DC+5V)?
Continued on the next page.
Check the microprocessor control circuits
around IC29 and IC34.
around IC29 and IC34.
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