Sharp LC-32GA3E (serv.man8) Service Manual ▷ View online
45
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
YES
YES
NO
NO
NO
NO
NO
Are there RGB signal inputs at pins
(25), (26) and (27), and Hsync/Vsync
signal inputs at pins (8) and (28) from
DVI connector (SC1900)?
(25), (26) and (27), and Hsync/Vsync
signal inputs at pins (8) and (28) from
DVI connector (SC1900)?
Are there Vsync and Hsync signal
outputs at pins (4) and (6) of IC1904
(INVERTER)?
outputs at pins (4) and (6) of IC1904
(INVERTER)?
Are DVI_SR/SG/SB and DVI_H/V
signals sent from MD connector?
signals sent from MD connector?
Are outputs at pins (12) and (14) of
IC1917(CONTROL) both (L, L)?
IC1917(CONTROL) both (L, L)?
Check PC settings.
Check IC1915 and its
peripheral circuits.
peripheral circuits.
Check IC1917 and its
peripheral circuits.
peripheral circuits.
Check IC1904 and its peripheral
circuits.
circuits.
Check IC1901, IC1903 and their
peripheral circuits.
peripheral circuits.
Do output pins (12) and (14) of
IC1917 become (H, H) when digital
PC mode is entered?
IC1917 become (H, H) when digital
PC mode is entered?
NO
YES
YES
Check ME connector I2C signal line.
Are IC1911(E2PROM) data accessed
by I2C when connected to PC?
by I2C when connected to PC?
Are DVI_SR/SG/SB and DVI_H/V
signals supplied to IC3700 (ADC) and
3701 (SYNC_SELECTOR) on the
main PWB?
signals supplied to IC3700 (ADC) and
3701 (SYNC_SELECTOR) on the
main PWB?
Check MD harness for disconnection.
YES
Check IC3700, IC3701 and their
peripheral circuits.
peripheral circuits.
YES
Image from DV1 input does not appear (Analog AV is not displayed) (4)
46
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
YES
YES
NO
YES
NO
NO
NO
YES
YES
NO
YES
YES
NO
YES
NO
NO
NO
YES
250ms
1sec
No sound or picture comes out.
No picture comes out.
Is the power LED lit up in green?
Is the power LED blinking in red?
Is the AC cord normal?
Blinking once? (At regular intervals)
Blinking once?
Blinking twice?
Blinking five times?
Blinking six times?
Is the Backlight off?
To "The backlight does not go on."
Is there the clock output at pin (40) of IC4602?
Does the adjustment process menu appear?
Check IC4501 and its peripheral circuits.
Check IC4701, IC4901 and their peripheral circuits.
Check the FFC (LV, SC3200, SC4601) connections between the
main PWB and LCD control PWB.
main PWB and LCD control PWB.
To "No picture comes out."
Table of power LED blinking timing at error occurrence
Type of error
Power supply error
Blinking once: Slow
Blinking once: Slow
H: ON
L: OFF
L: OFF
H: ON
L: OFF
L: OFF
H: ON
L: OFF
L: OFF
H: ON
L: OFF
L: OFF
H: ON
L: OFF
L: OFF
Lamp error
Blinking once: Fast
Blinking once: Fast
Panel power supply error
Blinking twice
Blinking twice
In-set temperature error
Blinking five times
Blinking five times
Fan error
Blinking six times
Blinking six times
Power LED operation (1 cycle)
To "The backlight does not go on."
Check the panel power supply circuit.
Check the temperature of the set.
Check the fan motor and its peripheral circuits.
NO
YES
Blinking seven times?
Check the temperature of the 1-bit amplifier
unit.
unit.
Check the power unit.
CCKM and D5V line are not defective.
CCKM and D5V line are not defective.
YES
47
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
Data dropout (relating to gray scale)
Noise is caused to the moving picture with the QS drive on.
The backlight does not go on.
The whole screen is whitish (LCD power supply).
Set PATTERN1
→
PATTERN1 on the adjustment process menu
to "2". Is the gray scale pattern displayed correctly?
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "1". Is the gray scale pattern displayed correctly?
Is OSTEMP.AD on Page 1 of the process adjustment mode set at
255?
255?
Is the harness connected correctly between the inverter GND
PWB and LCD control PWB?
PWB and LCD control PWB?
Is any of the fuses in the power supply unit blown?
Is power supplied to the inverter PWB?
Connect the harness correctly or replace it.
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "1". Is the gray scale pattern displayed correctly?
Disconnect the FPC from SC4651 and SC4652. (To protect the
panel against damage)
panel against damage)
Check the power supply voltage supplied to the panel (check at
SC4651 and SC4652).
SC4651 and SC4652).
Is the harness connected correctly between the PWBs (power
unit, inverter PWB, inverter GND PWB and LCD control PWB)?
unit, inverter PWB, inverter GND PWB and LCD control PWB)?
Check the connector and inverter circuit of each fluorescent lamp.
Check the peripheral circuits of IC4501.
Check the video signal circuit.
Is the input voltage at pin (62) of IC2004 (microprocessor) 5V?
The thermistor on the inverter GND PWB is faulty.
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "5". Is the test pattern displayed correctly at intervals of one
dot?
dot?
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "4". Is the test pattern displayed correctly at intervals of one
dot?
dot?
Check the connection between SC4651 and SC4652 and check
the peripheral circuits of IC4501.
the peripheral circuits of IC4501.
Check IC4701 and IC4901 and their peripheral circuits.
Connect the harness correctly or replace it.
Pin (62) of IC2004 (microprocessor) is faulty.
Check the inverter circuit located downstream from the blown
Is the control signal applied to pin (11) (OFL1) and pin (13)
(INV.OSC) of CN705 of the power supply unit?
(INV.OSC) of CN705 of the power supply unit?
Check IC4702, IC4902 and their peripheral circuits.
Check the line between IC4701 and IC4501.
Check the peripheral circuits of IC4602.
Check the line between IC4901 and IC4501.
47
LC-32GA3E
LC-37GA3E
LC-37GA3E
TROUBLE SHOOTING TABLE
(Continued)
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
Data dropout (relating to gray scale)
Noise is caused to the moving picture with the QS drive on.
The backlight does not go on.
The whole screen is whitish (LCD power supply).
Set PATTERN1
→
PATTERN1 on the adjustment process menu
to "2". Is the gray scale pattern displayed correctly?
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "1". Is the gray scale pattern displayed correctly?
Is OSTEMP.AD on Page 1 of the process adjustment mode set at
255?
255?
Is the harness connected correctly between the inverter GND
PWB and LCD control PWB?
PWB and LCD control PWB?
Is any of the fuses in the power supply unit blown?
Is power supplied to the inverter PWB?
Connect the harness correctly or replace it.
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "1". Is the gray scale pattern displayed correctly?
Disconnect the FPC from SC4651 and SC4652. (To protect the
panel against damage)
panel against damage)
Check the power supply voltage supplied to the panel (check at
SC4651 and SC4652).
SC4651 and SC4652).
Is the harness connected correctly between the PWBs (power
unit, inverter PWB, inverter GND PWB and LCD control PWB)?
unit, inverter PWB, inverter GND PWB and LCD control PWB)?
Check the connector and inverter circuit of each fluorescent lamp.
Check the peripheral circuits of IC4501.
Check the video signal circuit.
Is the input voltage at pin (62) of IC2004 (microprocessor) 5V?
The thermistor on the inverter GND PWB is faulty.
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "5". Is the test pattern displayed correctly at intervals of one
dot?
dot?
Set PATTERN1
→
PATTERN3 on the adjustment process menu
to "4". Is the test pattern displayed correctly at intervals of one
dot?
dot?
Check the connection between SC4651 and SC4652 and check
the peripheral circuits of IC4501.
the peripheral circuits of IC4501.
Check IC4701 and IC4901 and their peripheral circuits.
Connect the harness correctly or replace it.
Pin (62) of IC2004 (microprocessor) is faulty.
Check the inverter circuit located downstream from the blown
Is the control signal applied to pin (11) (OFL1) and pin (13)
(INV.OSC) of CN705 of the power supply unit?
(INV.OSC) of CN705 of the power supply unit?
Check IC4702, IC4902 and their peripheral circuits.
Check the line between IC4701 and IC4501.
Check the peripheral circuits of IC4602.
Check the line between IC4901 and IC4501.
