Read Sharp LC-30AD1E (serv.man8) Service Manual online
24
LC-30AD1E
TROUBLE SHOOTING TABLE
(Display)
YES
NO
NO
YES
NO
NO
YES
YES
YES
YES
NO
NO
YES
NO
No sound or picture comes out.
Does the power LED
light up in green.
light up in green.
Is the Backlight off?
Perform checking
around IC2204.
around IC2204.
Is "LOSS OF SYNC"
displayed?
displayed?
To "No picture comes
out"
out"
Perform checking
around IC2208.
around IC2208.
Is the power LED
blinking in red?
blinking in red?
Is the AC cord
normal?
normal?
NO
Replace the
AC cord.
AC cord.
Blinking once?
Blinking twice?
Blinking five times?
Blinking seven times?
To "The backlight does not go on"
Check the power unit.
Check the temperature of the set.
Check the 1-bit amplifier unit.
250ms
1sec
LTD operation (1 cycle)
H: ON
L: OFF
H: ON
H: ON
L: OFF
H: ON
L: OFF
H: ON
H: ON
L: OFF
H: ON
H: ON
L: OFF
H: ON
H: ON
L: OFF
H: ON
H: ON
L: OFF
H: ON
L: OFF
Table of monitor power LED blinking timing at the time of error occurrence
Error type
Cable error
AVC-side power error
Blinking once: Slow
AVC-side power error
Blinking once: Slow
Lamp error
Blinking once: Fast
Blinking once: Fast
AVC temperature
error
Blinking three times
error
Blinking three times
AVC fan error
Blinking four times
Blinking four times
Monitor temperature
error
Blinking five times
error
Blinking five times
Monitor fan error
Blinking six times
Blinking six times
Monitor 1-bit error
Blinking seven times
Blinking seven times
Monitor power error
Blinking twice
Blinking twice
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LC-30AD1E
NO
NO
NO
NO
YES
YES
YES
NO
YES
YES
PATTERN R, G and B become effective only when the monitor is started singly. Each can produce a solid
filled screen of 256-level gray scale, which can be used for IC wire connection checking when a certain gray
scale level is not produced.
filled screen of 256-level gray scale, which can be used for IC wire connection checking when a certain gray
scale level is not produced.
Dropout (gray-scale-related)
Set PATTERN1 on the adjustment
process menu to "2". Is the gray
scale pattern displayed correctly?
process menu to "2". Is the gray
scale pattern displayed correctly?
Check the color signal in question
with the gray scale test pattern. Is
there a problem with the contact
and resistance between IC4501
and SC4601-4604?
with the gray scale test pattern. Is
there a problem with the contact
and resistance between IC4501
and SC4601-4604?
Check FFC
connected to
SC4601-4604.
connected to
SC4601-4604.
Perform checking around
IC4501 and SC4601-4604.
IC4501 and SC4601-4604.
Set PATTERN3 on the adjustment
process menu to "1" to "3" (the QS
drive test pattern is displayed). Is
the gray scale displayed correctly?
process menu to "1" to "3" (the QS
drive test pattern is displayed). Is
the gray scale displayed correctly?
Perform checking around
IC4702 and IC4902.
IC4702 and IC4902.
Perform checking between
IC4701 and IC4501.
IC4701 and IC4501.
Perform checking between
IC4901 and IC4501.
IC4901 and IC4501.
Set PATTERN3 on the adjustment
process menu to "4". Is the test
pattern displayed correctly at
intervals of one dot?
process menu to "4". Is the test
pattern displayed correctly at
intervals of one dot?
Set PATTERN3 on the adjustment
process menu to "5". Is the test
pattern displayed correctly at
intervals of one dot?
process menu to "5". Is the test
pattern displayed correctly at
intervals of one dot?
Perform checking between SC2201
and IC2206, between IC2206 and
IC4701 or between IC2206 and
IC4901.
and IC2206, between IC2206 and
IC4701 or between IC2206 and
IC4901.
YES
NO
NO
YES
YES
YES
NO
NO
NO
No picture comes out.
Is the RSET terminal (pin (3))
of IC2206 set to "H"?
of IC2206 set to "H"?
Perform checking around X2201
connected to pin (161) of IC2206.
connected to pin (161) of IC2206.
Is X2201 connected to pin (161) of
IC2206 oscillating (18.26 MHz)?
IC2206 oscillating (18.26 MHz)?
Is IC2202 operating (CONFIG
ROM)?
ROM)?
Perform checking
around IC2202.
around IC2202.
Check X2201 and the
peripheral circuitry.
peripheral circuitry.
Is the clock (91.3 MHz) applied to
TL2202 (pin (102) of IC2206)?
TL2202 (pin (102) of IC2206)?
Is the normal synchronization
signal is applied to pins (97),
(96) and (95) of IC2206?
signal is applied to pins (97),
(96) and (95) of IC2206?
YES
YES
IC2206 is faulty.
Check IC4903 and the ICs
(IC4701, IC4702, IC4901 and
IC4902) downstream from it.
(IC4701, IC4702, IC4901 and
IC4902) downstream from it.
Note that the unit should be replaced when the receiver IC (IC2206), HDCP key ROM (IC2208) or microprocessor
(IC2004) is replaced.
Applicable unit: DKEYHC094FE50
(IC2004) is replaced.
Applicable unit: DKEYHC094FE50
26
LC-30AD1E
YES
No
YES
No
YES
No
Noise is caused to the moving picture when
the QS drive is set to ON.
the QS drive is set to ON.
Is OSTEMP.AD on the 3rd page of the
process adjustment mode set to 255?
process adjustment mode set to 255?
Is the harness connected correctly
between the Power PWB and Inverter
PWB?
between the Power PWB and Inverter
PWB?
Is the input voltage on pin (2) of
IC2004 (microprocessor) 5V?
IC2004 (microprocessor) 5V?
TH2001 thermistor
is faulty.
is faulty.
Check IC4701 and
IC4901 and the peripheral
circuitry.
IC4901 and the peripheral
circuitry.
Connect the harness
correctly or replace it.
correctly or replace it.
Pin (2) of IC2004
(microprocessor) is faulty.
(microprocessor) is faulty.
YES
No
No
YES
YES
No
YES
Check the connection of the high-voltage
(pin (2)) wire on the side of the blown
fuse and check that of the counterpart
high-voltage (pin (2)) wire of the
fluorescent lamp on the opposite side.
(pin (2)) wire on the side of the blown
fuse and check that of the counterpart
high-voltage (pin (2)) wire of the
fluorescent lamp on the opposite side.
The backlight does not go on.
Is any of the fuses of
F6551-F6556
blown?
F6551-F6556
blown?
Is the control signal applied to
pin (8) (OFL1) and pin (9)
(OFL2) of P6564?
pin (8) (OFL1) and pin (9)
(OFL2) of P6564?
Is the cord connected correctly
between the LCD Control PWB and
Inverter PWB and Power PWB?
between the LCD Control PWB and
Inverter PWB and Power PWB?
Check the peripheral circuitry of
IC4501 of the LCD Control PWB
and check the operation of
Q7701 and Q7702.
IC4501 of the LCD Control PWB
and check the operation of
Q7701 and Q7702.
Is power supplied to
Inverter PWB?
Inverter PWB?
Check the Lamp error detection circuit on the Inverter-GND
PWB.
PWB.
Check the 15V output on the
Power PWB.
Power PWB.
Check the inverter
circuit downstream
from the blown fuse.
circuit downstream
from the blown fuse.
27
LC-30AD1E
YES
No
YES
YES
YES
No
YES
No
No
No
No
Check if the internal/external
switching relay (RY3901)
functions correctly.
switching relay (RY3901)
functions correctly.
Is the output signal from the
1-bit amplifier applied to
P3903?
1-bit amplifier applied to
P3903?
Perform checking around
IC2004, IC3804 and the 1-
bit amplifier.
IC2004, IC3804 and the 1-
bit amplifier.
Are the MUTE circuits
(Q3804 and Q3805)
operating?
(Q3804 and Q3805)
operating?
Is the audio signal applied to
pin (7) (L-IN) and pin (9) (R-
IN) of P3804?
pin (7) (L-IN) and pin (9) (R-
IN) of P3804?
Perform checking
around IC3803 and
IC3808.
around IC3803 and
IC3808.
Check for the AVC
System side for output.
System side for output.
Is the audio signal applied to
pin (13) and pin (20) of
SC2202 on the Monitor PWB?
pin (13) and pin (20) of
SC2202 on the Monitor PWB?
Perform checking around Q2012 and
Q2014 and check the wire between
Monitor PWB and Audio PWB.
Q2014 and check the wire between
Monitor PWB and Audio PWB.
Check if 5V is supplied to the power
regulator circuit (IC3810, IC3812 and
IC3816) and pin (2) of P3804.
regulator circuit (IC3810, IC3812 and
IC3816) and pin (2) of P3804.
Is power supplied to each IC
on the AUDIO PWB?
on the AUDIO PWB?
Is the audio signal applied
to pin (13) and pin (15) of
P3803?
to pin (13) and pin (15) of
P3803?
YES
YES
YES
No
Check the input/output
voltage of IC4103.
voltage of IC4103.
Perform checking around Q4102 and IC4101.
Is the voltage of emitter side of
Q4102 about 6V?
Q4102 about 6V?
The whole screen is whitish (LCD power supply)
Check the power supplies.
Check the power supplies to
SC4101 and SC4102 in particular.
Check the power supplies to
SC4101 and SC4102 in particular.
Remove the FFCs attached to SC4101
and SC4601- SC4604 (because the
panel may be broken).
and SC4601- SC4604 (because the
panel may be broken).