Sharp LC-37GD7E (serv.man2) Service Manual ▷ View online
24
Technical specifi cations
LC-37GD7E
General
Art. No.
65482
Dimensions with tablestand (mm)
917x707x307
(WxHxD)
Dimensions without tablestand (mm)
917x645x108
(WxHxD)
Picture format
16:9
Screen diagonal in cm
94
Picture resolution
1366x768
Contrast ratio
800:1
Viewing angle horizontal and vertical
170
o
Weight with tablestand (kg)
approx. 24.2
Rated power IEC 62087 (watts)
100
Power consumption on standbý (watts)
< 3
Ambient temperature (
o
C) 5-35
Relative humidity
20 ... 80% (no condensation)
Air pressure (HPa)
800 ... 1114
(0 ... 2000m above sea level))
Chassis L
2650
Power supply
220 V - 240 V / 50-60 Hz
Tuner VHF/UHF/cable
Hyperband 8 MHz
Hyperband 8 MHz
41 MHz to 860 MHz
Station memory
1680
TV standards
B/G, I, L, D/K, M, N
Colour standards
PAL SECAM, NTSC-V, PAL 60 Hz
Audio standards
mono/stereo/2-sound
Nicam B/G, I, L, Virtual Dolby
Audio rated output (watts)
2 x 20 / 6 Ohm
Analogue teletext
TOP/FLOF Level 2.5
Teletext page memory
3500
Digital teletext (UK only)
MHEG-5
Connections
Jack 3.5 mm
Headphone 32-2000 Ohm
EXT 4 Mini-DIN
Video IN
Y/C (S-VHS/Hi 8)
EXT 4 (yellow)
Video IN
CVBS (VHS/8 mm)
Cinch (white/red)
Audio IN
L/R
IEC socket 75 ohms (*5V/80mA) Antenna/cable/DVB-T
*F socket 75 ohms 13/18V/350 mA
*F socket 75 ohms 13/18V/350 mA
ANT-SAT
EXT 1
Video IN
Y/C (S-VHS/Hi 8)
CVBS (VHS/8 mm)
RGB,
YUV
Video
OUT
CVBS
Y/C (with SVHS AV link only)
Audio
IN
L/R
Audio
OUT
L/R
EXT 2
Video IN
Y/C (S-VHS/Hi 8)
CVBS (VHS/8 mm)
Video OUT
CVBS (VHS/8 mm)
Y/C (S-VHS/Hi 8)
Audio
IN
L/R
Audio
OUT
L/R
Cinch
Audio IN max. 2Vrms
Center
2 x Cinch
Audio IN
L/R
2 x Cinch
Audio OUT
L/R
EXT 3 (Cinch)
COMPONENT IN
Cb/Pb signal
COMPONENT IN
Cr/Pr signal
COMPONENT IN
Y signal
Cinch
Digital Audio IN (SPDIF)
digital
sound
Cinch
Digital Audio OUT (SPDIF)
digital
sound
EXT 5
Digital video/audio IN
type
A
19-pole
digital picture and sound
PC IN
VGA/XGA IN PC/STB picture signal
Mini DIN
Service/S-Link
* Devices with digital satellite tuner
25
H
YES
L
H and L
L and H only
NO
NO
YES
YES
NO
YES
YES
NO
YES
No picture comes out.
n
i
p
8
#
)
M
R
(
4
0
3
2
P
k
c
e
h
C
n
i
p
4
#
)
M
R
(
4
0
3
2
P
k
c
e
h
C
Check the power unit.
Blinking once? (At regular intervals)
Blinking once?
Blinking twice?
Blinking five times?
Is the Backlight off?
To "The backlight does not go on."
Is there the clock output at pin (26) of IC4601?
Check IC4502 and their peripheral circuits.
Check the FFC (LV, SC4601) connections.
To "The backlight does not go on."
Check the panel power supply circuit.
Check the temperature of the set.
Check the power unit.
Troubleshooting for LCD-Controller and MICOM-Board
26
TROUBLE SHOOTING TABLE (Continued)
LED flashing patterns for error notification
250 ms
1 sec
1) Red power LED
Remarks
Error type
Red power LED operation (one cycle)
"Pin" means a monitoring microcomputer pin.
H: On
Lamp failure
1 quick flash
L: Off
H: On
2) Refer to "Details of power failure".
Power failure
2 flashes
L: Off
Communication failur
e
H: On
3) Refer to "Details of communication failure".
between main CPUs
Communication line failure or main CPU communication failure
→
Check debug statements for the main CPU.
3 flashes
L: Off
H: On
Monitor temp. failure
5 flashes
L: Off
2) Details of power failure
(2 flashes of power LED and then flashes of alarm LED)
Remarks
Error type
Alarm LED operation (one cycle)
"Pin" means a monitoring microcomputer pin, unless otherwise noted.
H: On
15 V failure
1 flash
L: Off
H: On
2 flashes
L: Off
H: On
9 V (A) failure
3 flashes
L: Off
H: On
VSH 3.3 V failure
4 flashes
L: Off
H: On
3.3 V failure
5 flashes
L: Off
H: On
6 flashes
L: Off
3) Details of communication failure
(3 flashes of power LED and then flashes of alarm LED)
Remarks
Error type
Alarm LED operation (one cycle)
Initial communication
H: On
reception failure
1 flash
L: Off
Start-up reason
H: On
reception failure
2 flashes
L: Off
Regular communicati
o
H: On
failure
3 flashes
L: Off
H: On
Restart failure
4 flashes
L: Off
Power LED: P2304 (RM), pin
8
Alarm LED: TP2301 (IC2301, pin 22)
LCD controller PWB
Basically, communication logs are analyzed by a bus monitor or debug print logs are analyzed.
L_FL_ERR (pin 73) is defect (L). 5 sequential flashes at 1 second intervals indicate a lamp failure (failure can be detected o
nly while the backlight is on).
Be aware that the lamp failure detecting operation is not activated except in the monitoring process after the LED has flashed
5 times in total.
The total number of flashes is cleared to 0 by the setting in the monitoring process or after the LED lit up for 30 minutes in
a row.
If the panel temperature is 60˚C or more for 15 seconds or more in a row, CAUTION appears on the OSD of AVC (flashes in red in
the lower right screen).
If the panel temperature is 60˚C or more for 25 seconds or more in a row, the error standby is activated.
(OSTEMP in monitoring process OTHER 2: thermistor AD value appears, TEMP ERR in page FAN: temperature failure AD value is chang
ed): thermistor
Not used
Detected during start-up and operation (interruption)
FREERUN (pin 59) or STB (pin 32) is defect (L). 3.3 V is not applied to the LCD controller.
CSEN1 (pin 34) is defect (L).
VSH_IN (pin 36pin) is defect (H). VSH 3.3 V is not applied.
Detected during start-up and operation (interruption)
15V_CHK (pin 31) is defect (L). 15 V is not applied.
Detected only during start-up. When the error is detected during operation, the projector is restarted by an interrupt handling
(instantaneous blackout processing).
Not used
→
Main CPU start-up failure or monitoring microcomputer's reception failure
Regular communication that is performed at 1 second intervals in the normal operation is interrupted.
→
Main CPU operation failure or monitoring microcomputer's reception failure
Detected during start-up and operation (interruption). FREERUN is checked during start-up and STB is checked while light is on.
When the projector is restarted by program such as standby on/off, notice for the completion of restart is not received.
→
Main CPU restart failure or monitoring microcomputer's reception failure
Initial communication from the main CPU is not received. (Request for the monitor model No. is not received.)
→
Communication line failure or main CPU start-up failure
Reason for start-up is not received from the main CPU. (Start-up communication to start-up reason notification 22h is not recei
ved.)
Troubleshooting for LCD-Controller and MICOM-Board
27
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 P7705 of LCD Control PWB?
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.
←
←
←
←
←
TROUBLE SHOOTING TABLE (Continued)
Troubleshooting for LCD-Controller and MICOM-Board
Click on the first or last page to see other LC-37GD7E (serv.man2) service manuals if exist.