Read Sharp LL-T2010W (serv.man15) Service Manual online
LL-T2010W
TROUBLE SHOOTING
4 – 4
(No)
Is D25 cathode at DC+2.5V?
Check the DC+2.5V power line and the
IC22 peripheral circuits.
IC22 peripheral circuits.
(Yes)
(Yes)
Does the whole display remain black?
Is the voltage across the fuse F3
DC+12.0V?
DC+12.0V?
(No)
Check the POWER_CTRL2 signal and
the Q4 peripheral circuits.
the Q4 peripheral circuits.
(No)
(Yes)
(Yes)
Is the display size abnormal?
Is the setup item of MODE SELECT in
the adjustment properly set?
the adjustment properly set?
Check X1, X3, IC15, the peripheral
circuits, and the software.
circuits, and the software.
(No)
Adjust properly according to the display
adjustment procedure.
adjustment procedure.
(No)
(Yes)
When the whole black display is shown
from the signal source, is there any flicker
of colors?
from the signal source, is there any flicker
of colors?
Check IC10, IC11, IC12, and the
peripheral circuits.
peripheral circuits.
(No)
(Yes)
(Yes)
Is there any deflection or flicker on the
LCD display?
LCD display?
Is the setup item of MODE SELECT in
the adjustment properly set?
the adjustment properly set?
Check IC2, IC3, IC4, and the peripheral
circuits.
circuits.
(No)
Adjust properly according to the display
adjustment procedure.
adjustment procedure.
(No)
(Yes)
(Yes)
(Yes)
Is there any abnormality in colors of the
LCD display?
LCD display?
Are the setup items of GAIN CONTROL
and WHITE BALANCE properly set?
and WHITE BALANCE properly set?
(No)
Adjust properly according to the display
adjustment procedure.
adjustment procedure.
(No)
(Yes)
Is the analog color signal output
normal? (Pins on C7, C11, C15, C18
side)
normal? (Pins on C7, C11, C15, C18
side)
(No)
Check the IC1 peripheral circuits.
(Yes)
When BRIGHT CONTRAST of a
gradation pattern, is the abnormal area
shifted?
gradation pattern, is the abnormal area
shifted?
Check the IC10, IC11, and IC12
peripheral circuits.
peripheral circuits.
(Yes)
Display the RGB color gradation of the
output data lines of RN1~Rn12 and
check the line corresponding to the
abnormal color.
output data lines of RN1~Rn12 and
check the line corresponding to the
abnormal color.
(No)
Is the positive side of C28 at DC+5V?
(No)
Check the L10 peripheral circuits.
(Yes)
Are the oscillation circuits of X1 and X3
normal? (24MHz)
normal? (24MHz)
(No)
Check X1, X2, and the IC15 peripheral
oscillating circuit.
oscillating circuit.
(Yes)
Are the clock (R94) and the signal
output of DE (R95) normal?
output of DE (R95) normal?
Check the IC17 peripheral circuits,
CN10, CN11, and the LCD module.
CN10, CN11, and the LCD module.
(No)
Execute
(Yes)
Continued from
4
2
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