Sharp LC-45GD1E (serv.man29) Service Manual ▷ View online
60
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
2V/div
4.0
µ
/div
2V/div
4.0
µ
/div
2V/div
4.0
µ
/div
The picture is not displayed normally.
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
The test pattern is normally displayed,
but the whole screen is white for other
displays.
The test pattern is displayed normally,
but the whole screen is black for other
displays.
Is VSYNC normally input to pin (2) of
IC4401?
Check SC2201, periphery
of SC5301, FFC and
periphery of IC5301.
Check IC4003, IC4001 and
periphery of IC4004.
Is pin (5) of IC2205 3.3V?
Check IC2203, IC2201 and
periphery of SC5301.
Are H, V and DE output from TP5301
to TP5303?
Check the periphery of
IC5301 and that of SC5302.
Check SC2201, periphery of
SC5301, FFC and periphery of
IC2203.
When switching REV DISPLAY of the
process mode's LCD PAGE1, the
position of the defective portion does not
change.
The pattern is displayed every other
line in the horizontal direction. Or,
flicker is displayed.
Normal waveform is
output from R4726,
R4727, R6826 and
R6827. (*1)
Normal waveform is
output to TP5829 and
TP5830. (*1)
Check the FPC
connecting the panel.
Check the harnesses
between TCONTOP
and DC/DC PWB.
Normal waveform is input
to pin (12) of P1701. (*2)
Check the harnesses
between TCONTOP
and DC/DC PWB,
periphery of IC4301
and that of P4801.
TP5831 is 16 MHz.
Check the periphery of
X5801.
TP7851, TP7852, TP7853
and TP7854 are 8.1V,2.9V,
5.7V and 5.3V respectively.
Check the CSPOWER
PWB.
Check IC5802, IC5805,
IC5806 and periphery of
IC5807.
Is the gradation pattern displayed
normally when setting PATTERN1 of
PATTERN PAGE1 in the adjustment
process menu to 02?
The upper part of the
screen is abnormal.
Either the left or right
part is abnormal.
Check between IC4301
and SC4702 as well as
between IC4302 and
SC4701.
Check IC4503, IC4504 and
periphery of IC4505.
The lower part of the
screen is abnormal.
The screen is partially
whitish or dark.
Either the left or right
part is abnormal.
Check IC6601, IC6602 and
periphery of IC6603.
Check between IC6401
and SC6802 as well as
between IC6402 and
SC6801.
Is the gradation pattern displayed
normally when setting PATTERN3 of
PATTERN PAGE1 in the adjustment
process menu to 21?
Check between IC4101 and IC4102,
between IC4201 and IC4202 and
their periphery.
Are all gradations displayed normally
when changing PATTERN A of
PATTERN PAGE1 in the adjustment
process menu from 0 to 255?
Check between IC4001 and IC4101,
between IC4004 and IC4201 and
their periphery.
For the displays other than the test
pattern, the left half of the screen is
abnormal.
Check between IC4004 and
SC4002, between IC5502 and
SC5502 and FPC.
For the displays other than the test
pattern, the right half of the screen is
abnormal.
Check between IC4001 and
SC4001, between IC5501 and
SC5501 and FPC.
The displays other than the test pattern
are abnormal every other line in the
vertical direction.
Check the periphery of IC5402.
For the displays other than the test
pattern, the whole screen is abnormal.
Check between IC5301 and IC5401
and their periphery.
(*1)
(*2)
(*3)
61
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
YES
NO
NO
YES
YES
NO
NO
No sound comes out (connect with the AVC
center and check).
center and check).
Power supply error
Are the speakers properly connected to the audio
output terminals?
output terminals?
Connect properly, or replace the wires.
Are P5301 and P601 properly connected with a
wire?
wire?
Connect properly, or replace the wires.
Check if sound comes out from the AVC center.
When turning on the power, pin (19) of IC2203
remains 3.3V.
remains 3.3V.
The output of pin (5) of IC4807 is 5V.
Check IC4804
and its peripheral circuits.
Check IC4807
and its peripheral circuits.
62
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
* At this time, ERR is output from the inverters.
Output conditions: The SPC terminal voltage is 2.2V or more.
VS Terminal > 1.25V
IS Terminal < 0.6V
COMP Terminal < 0.6V
COMP Terminal > 1.25V
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
"The backlight does not come on."
1
Short-circuit the capacitors connected to pins (22) of
IC7301, 7401, 7501 and 7601 of inverter units 1-4 and
turn on the unit.
Check the connection of each connector. (P7308, P7309,
SC7401, P7508, P7509, SC7601)
Check the peripheral circuits of IC7302, 7402, 7502 and
7602.
"The backlight does not come on."
2
When the microprocessor operates in the lamp error mode,
the power LED flashes in red once.
Short-circuit the capacitors connected to pins (22) of
IC7301, 7401, 7501 and 7601 of inverter units 1-4 and turn
on the unit in the process mode.
Check the inverters which do not come on.
Check that the voltage supplied to the inverters is 15V.
(P7307, P7409, P7507 and P7609)
Is the voltage of pins (1) (DUTY) and (16) (STB) of IC7301,
7401, 7501 and 7601 2.5V or more?
Check that the output voltage of IC7302, 7402, 7502 and
7602 is 5V.
Check the voltage of COMP1, COMP2, VS1-2 and IS1-2
terminals of IC7301, 7401, 7501 and 7601.
Check the peripheral circuits of IC7301, 7401, 7501, 7601,
7303, 7403, 7503 and 7603.
With each connector open,
check that the voltage is 15V.
Check the output voltage of the
peripheral circuits of Q7303,
7309, 7313, 7317, 7323, 7327,
7403, 7409, 7413, 7417, 7423,
7427, 7503, 7509, 7513, 7517,
7523, 7527, 7603, 7609, 7613,
7617, 7623 and 7627.
Check the connection of P7301-
6, 7401-6, 7501-6 and 7601-6.
Check the periphery of the
detection circuits of T7301-6,
7401-6, 7501-6 and 7601-6.
Check the lamp.
Check each output voltage
of the power supply unit.
63
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
NO
YES
Noise is caused to the moving picture with the QS drive on.
Is the harness connected correctly between the Motor Control
PWB and Top LCD control PWB?
PWB and Top LCD control PWB?
Is the input voltage at pin (62) of IC2203 (microprocessor) 5V?
The thermistor on the Motor Control PWB is faulty.
Connect the harness correctly or replace it.
Pin (62) of IC2203 (microprocessor) is faulty.
NO
YES
NO
YES
NO
YES
YES
When only the monitor starts and PATTERN3 of PATTERN
PAGE1 is set to 01, noise appears.
PAGE1 is set to 01, noise appears.
When PATTERN3 of PATTERN PAGE1 is set to 21, noise
appears.
appears.
When PATTERN3 of PATTERN PAGE1 is set to 11, noise
appears.
appears.
Check L4101 to 4105, L4201 to L4205, SC4201, SC6401 and
periphery of the FPC.
periphery of the FPC.
Check between IC4101 and IC4102, between IC4201 and IC4202
and their periphery.
and their periphery.
Check between IC4101 and IC4103, between IC4201 and IC4203
and their periphery.
and their periphery.
NO
Is the value on the right side of the process adjustment mode
LCD PAGE2 T255?
LCD PAGE2 T255?
Check IC4101, IC4201 and their periphery.
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