Read Sharp LL-T1815 (serv.man14) Service Manual online
PC-UM10M
LL-T1815-H/B TROUBLE SHOOTING
4 – 4
4
(No)
Does the color flicker when displaying whole
black from the signal source?
3
(Yes)
Check IC10, IC11, and IC12 peripheral circuits.
4
(No)
4
(Yes)
Does the display deflect or flicker?
3
(Yes)
Are the adjustment items of ADJUSTMENT and
MODE SELECT are properly set?
3
(No)
Set the items properly according
to the LCD display adjustment
procedures.
(No)
4
(Yes)
ICheck IC2, IC3, and IC4 peripheral circuits.
Is there any abnormality in the colors of the LCD
display?
3
(Yes)
Are the adjustment items of GAIN CONTROL and
WHITE BALANCE properly set?
3
(No)
Set the items properly according
to the LCD display adjustment
procedures.
4
(Yes)
Are the analog color signal outputs normal? (Pins on
the IC8 side of C7, C11, C15)
3
(No)
Check IC1 peripheral circuits.
4
(Yes)
(No)
Is the abnormal section shifted by varying BRIGHT
•
CONTRAST with the gradation pattern?
3
(Yes)
Display the RGB color gradation
of RN1 - RN12 output data
lines, and check the line where
there is any abnormality.
4
(No)
Check IC10, IC11, and IC12 peripheral circuits.
Are the adjustment contents saved after comple-
tion of adjustment of the display?
3
(No)
Check IC13 and IC16 peripheral circuits.
4
(Yes)
Can the inputs be switched normally?
3
(No)
Check IC1, IC2, IC3, and IC4 peripheral circuits.
4
(Yes)
No abnormality
5
4
Is the R156 side of C144 at HIGH level (DC+5V)?
3
(No)
Check the RESET circuit in the peripheral of IC17
and IC14.
4
(Yes)
Is the Q6 output (connected to R157) changed to
HIGH level after turning on the main SW and then
to LOW level (DC+0V)?
3
(No)
Check Q6 peripheral circuits.
4
(Yes)
Are signal waveforms provided at 12PIN - 19PIN
of IC18?
3
(No)
Check IC18 and IC19 peripheral circuits.
4
(Yes)
Are signal waveforms provided at RN30, R166,
and R168?
3
(No)
Check RN30, R166, and R168 (the control line of
IC16 and IC8).
4
(Yes)
Check IC8.
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