Sharp LL-171ME Service Manual ▷ View online
LL-171ME
CONNECTION, ADJUSTMENT, OPERATION, AND FUNCTIONS
2 – 10
4) The system asks you to enter the serial number, year and month.
Enter them in the following way.
5) After the above three items are entered, the screen asks you to confirm
the data you entered. Press Y if there is no mistake and press N if
there is any mistake.
(If N is pressed, the program will terminate without doing anything.)
there is any mistake.
(If N is pressed, the program will terminate without doing anything.)
6) After writing the above data in U16, enter V171ME. The contents of
data written in U16 are displayed on screen to allow you to check if
data have been correctly written.
data have been correctly written.
*
You can confirm the contents by carrying out step 6) after finish-
ing steps 1) and 2).
*
Supplementary explanation
1.
Precautions concerning writing EDID
1
When writing is executed, "_" appears followed by "Write Start". If writ-
ing is done correctly, "Write OK" appears on screen and then verifica-
tion begins. When verification starts, "Verify Start" appears followed by
tion begins. When verification starts, "Verify Start" appears followed by
"_". When writing is finished, "Verify OK" appears on screen.
2
If writing went wrong, ######### WRITE ERROR #############
appears on screen, blinking in red.
appears on screen, blinking in red.
If there is the message
[[[[[[[[[[[[[[[[[[[[ Troubleshooting ]]]]]]]]]]]]]]]]]]]]
(1) If the screen is not displayed properly,
showing a lot of garbled characters: This program assumes that it is
used on MS-DOS incorporating ANSI.SYS.
ANSI.SYS is a standard program supplied with MS-DOS and
ANSI.SYS is a standard program supplied with MS-DOS and
Windows95/98.
If the your operating system does not have ANSI.SYS, add the fol-
lowing line in the CONFIG.SYS file.
lowing line in the CONFIG.SYS file.
DEVICE=C:\WINDOWS\ANSI.SYS
The above path of ANSI.SYS is a standard path for Windows95.
In the case of MS-DOS, the standard path of ANSI.SYS is
In the case of MS-DOS, the standard path of ANSI.SYS is
C:\DOS\ANSI.SYS
Check your operating system and set the correct path.
(2) The screen froze, showing no response.
1.
The tool is turned on, if it needs power supply.
2.
The parallel port is usable and its I/O address is 0378h.
3.
The cable is properly connected.
Note: How to check parallel port setting on Windows
1.
Open System on Control Panel.
2.
Open Device Manager and select the Display type.
(In the case of Windows2000 and XP, select the Hardware tag
and press the Device Manager button.)
(In the case of Windows2000 and XP, select the Hardware tag
and press the Device Manager button.)
3.
Click the "+" mark at the left of "Port (COM)/LPT)" and check
that there is "Printer Port (LPT1)".
("ECP Printer Port (LPT1)" or the like in the box. )
that there is "Printer Port (LPT1)".
("ECP Printer Port (LPT1)" or the like in the box. )
4.
Open the Properties of Printer Port (LPT1), and then open the
Resource tag.
Resource tag.
5.
Check that the setting of "I/O Range" is 0378-037F.
(3) The screen displays no "." or only one ".", showing ERR: Write Error.
Check that the cable is properly connected.
■
CONNECTION DIAGRAM OF FIRMWARE/EDID WRITING JIGS
Input Serial Number : 3G000220 Enter the serial number.
Input Year
: 2004
If you are not sure about the orig-
inal data, enter the year in which
servicing has been conducted.
inal data, enter the year in which
servicing has been conducted.
Input Week
: 0
If you are not sure about the orig-
inal data, always enter 0.
inal data, always enter 0.
LL-171ME
Serial Number
: 3G000220
Year
: 2004
Week
: 0
Correct? (Y/N)
:
LL-171ME
Serial Number
: 3G000220
Year
: 2004
Week
: 0
"ERR: Write Error"
in the preceding line of the above write error
message blinking in red, a failure occurred in
the writing process.
message blinking in red, a failure occurred in
the writing process.
"ERR: Verity Error"
in the preceding line, verification failed.
"ERR: Checksum Error" in the preceding line, the checksum is wrong.
Connect to
the USB port of the PC
the USB port of the PC
Connect to COM1 port of the PC
(not necessary for EDID writing)
(not necessary for EDID writing)
RS-232C
(9-pin D-sub)
cross cable
Connect to the printer port
of the PC (not necessary
for firmware writing)
of the PC (not necessary
for firmware writing)
VGA cable
VGA
terminal
terminal
SW1: Parallel (EDID)
Serial (PROGRAM)
SW2: AUTO
MANUAL
SW3: 1502A
T1620
SW4: 1502A
T1620
LL-171ME
Back of a main part
Board
VGA
connector
DVDVI-D
connector
connector
USB
Serial connector
Parallel connector
USB cable
The directions of the DIP switch of the X1049MP-27
SW1 should be on the Parallel side for EDID writing and
on the Serial side for firmware writing.
SW1 should be on the Parallel side for EDID writing and
on the Serial side for firmware writing.
Use X1049MP-27.
LL-171ME
DISASSEMBLY AND ASSEMBLY
3 – 1
CHAPTER 3. DISASSEMBLY AND ASSEMBLY
1. SEPARATING LCD UNIT AND BASE UNIT
1.
Remove the four screws
1
and separete the LCD unit
3
from the base
unit
2
.
2. REMOVEING LCD MAIN BORD
1.
Remove the two screws
1
and then remove the AV cover
2
.
2.
Remove the four screws
3
and then remove the rear cover
4
.
3.
Remove the eleven screws
1
and two hex. screws
2
, and then remove
the shield
3
.
4.
Remove the three screws
4
, and then remove the AV support
5
.
5.
Remove the each connectors óand ten screws
6
, and then remove
the LCD main board
7
.
3. REMOVING LCD MODULE
1.
Remove the five screws
1
and then remove the front cabinet
2
.
2. Remove the four screws
3
, and then remove the LCD module
4
from the frame bracket
5
.
3
2
1
1
3
3
3
3
4
2
1
1
1
1
1
1
1
3
5
4
4
2
6
6
1
6
6
6
6
6
7
3
3
3
1
1
1
1
5
4
2
LL-171ME
TROUBLESHOOTING
4 – 1
CHAPTER 4. TROUBLESHOOTING
Go to item
(No)
(Yes)
(Yes)
LED does not come on.
Go to item
Power LED (power supply indicator)
does not come on.
does not come on.
Power LED remains in orange,
does not turn green.
does not turn green.
(No)
(Yes) Go to item
Backlight does not come on.
(No)
(Yes) Go to item
OSD is not displayed when MENU
or INPUT is pressed.
or INPUT is pressed.
Go to item
(No)
(Yes)
(Yes) Replace Fuse (F1).
12 V (L1) is not applied.
LCD defective
12 V (F1) is not output.
(No)
LED remains in orange.
(Yes) Go to item
(No)
(Yes) Go to item
Go to item
Power voltage 3.3 V (F3) is not output.
(No)
(Yes)
Power voltage 5.0 V (F2) is not output.
Check PW166 (U21) and
circuits around it.
circuits around it.
(No)
Perform "All reset" (Press and hold
down Enter and Menu buttons
while turn on power supply.)
down Enter and Menu buttons
while turn on power supply.)
HW-PW signal (Pin 1 of J3) does
not become low when power
button is pressed.
not become low when power
button is pressed.
(No)
(No)
Check U9 and circuits around it.
Reset signal is active (R32 is
high) when power supply is
turned on?
high) when power supply is
turned on?
(Yes)
(No)
Power LED control signals (R15,
R16) do not become high.
R16) do not become high.
(Yes)
(No)
PW166 operation CLK (Y1)
generates clock (14.318 MHz)?
generates clock (14.318 MHz)?
(Yes)
Check PW166 (U21) and flash
ROM (U23) peripheral circuits.
ROM (U23) peripheral circuits.
Check U5, circuits around
it, and IIC bus.
it, and IIC bus.
Check generator (Y1) and
circuits around it.
circuits around it.
(No)
Either LED control signal
conductor (R15) or power LED
red (R16) is not high.
conductor (R15) or power LED
red (R16) is not high.
(Yes)
Check power switch PWB
connector.
connector.
(No)
PW166 operation CLK (Y1)
generates clock (14.318 MHz)?
generates clock (14.318 MHz)?
(Yes)
(No)
Flash ROM (U23) is not normal?
(Yes)
Rewrite in flash ROM
(U23).
(U23).
(No)
PW166 operation CLK (Y1)
generates clock (14.318 MHz)?
generates clock (14.318 MHz)?
(Yes)
Check generator (Y1) and
circuits around it.
circuits around it.
Backlight does not come on.
(No)
Backlight power supply VDD
(Pins 1, 2 and 3 of J1) output
voltage (12 V)?
(Pins 1, 2 and 3 of J1) output
voltage (12 V)?
(Yes)
Check U2 and circuits
around them.
around them.
(No)
Backlight ON signal VEE (Pin 8
of J1) outputs signal (high)?
of J1) outputs signal (high)?
(Yes)
Check U5 and circuits
around it.
around it.
(No)
Backlight control signal VCON
(Pin 7 of J1) outputs voltage (0 -
3.3 V)?
(Pin 7 of J1) outputs voltage (0 -
3.3 V)?
(Yes)
Check U5 and circuits
around it.
around it.
Check inverter connection cable
and inverter unit.
and inverter unit.
OSD is not displayed.
(Yes)
Adapter defective
(No)
Adapter output is normal (approx.
12 V) and output voltage is stable?
12 V) and output voltage is stable?
(No)
(No)
LCD 5V (SW-LCD: L24) is
output?
output?
(Yes)
Check U10 and circuits
around it.
around it.
(No)
LCD display signal is output from
PW166 (U21)?
PW166 (U21)?
(Yes)
(Yes)
Check 12-V line for shorting.
HW-PW signal circuit is normal?
(Yes)
(No)
Power switch PWB switch
(SW9K) clicks.
(SW9K) clicks.
(Yes)
Replace power switch PWB.
(Yes)
Check PW166 (U21) and
circuits around it.
circuits around it.
(No)
Check power switch PWB
connection cable connector for
improper insertion or cable for
being caught.
connection cable connector for
improper insertion or cable for
being caught.
(Yes)
Reinsert or replace if cable
is broken due to being
caught.
is broken due to being
caught.
Replace power supply button
which is fit into power supply
switch (SW9K).
which is fit into power supply
switch (SW9K).
(No)
Check HW-PW signal
circuit and around it.
circuit and around it.
(No)
Check LCD relay PWB
connection cable for proper
connection or broken wire.
connection cable for proper
connection or broken wire.
LCD control signal is output (LCD
relay PWB)?
Check for fit between LCD unit
and LCD relay PWB.
relay PWB)?
Check for fit between LCD unit
and LCD relay PWB.
Power voltage 5V (F2) is not output?
No screen appears.
.
.
.
.
.
.
.
.
Go to item
(Yes)
Power voltage 5.0 V (Pin 3 of UP3)
is not output.
is not output.
.
Go to item
.
Check generator (Y1) and
circuits around it.
circuits around it.
LL-171ME
TROUBLESHOOTING
4 – 2
Fuse (F3) is not blown out?
(Yes)
(No)
Replace Fuse (F3).
Pictures appear when AV is input?
TV tuner (UT13) is defective.
(No)
(Yes)
Go to "No video appears".
(No)
Check "Picture line".
(No)
Check UT3 and circuits
around it.
around it.
(No)
Check IIC bus line and
around it.
around it.
Check regulator (U3) and circuits
around it.
around it.
Fuse (F2) is not blown out?
Replace LCD unit with a new one.
(Yes)
(No)
Replace Fuse (F2).
(No)
Check cable and related parts.
Check regulator U7 and circuits
around it.
around it.
PC is Sync On Green?
(No)
(Yes)
Sync On Green is input (R43)?
(Yes)
Sync On Green is output
(Pin 65 of U19)?
(Pin 65 of U19)?
(Yes)
RGB signals (R42, R43, R44) are
input?
input?
(No)
HSYNC is input (R67)?
(Yes)
(Yes)
(Yes)
(Yes)
(No)
HSYNC is output (at Pin 66 of
U19)?
U19)?
Check U19 and circuits
around it.
around it.
(No)
RGB signals (R42, R43, R44) are
input?
input?
Check RGB signals from
W2 to AD9883A (U19).
W2 to AD9883A (U19).
(Yes)
(Yes)
(No)
The signal between PW166
(U21) and THC63LVDM83A
(U24) is normal?
(U21) and THC63LVDM83A
(U24) is normal?
Check circuits around
PW166 (U21) and
THC63LVDM83A (U24).
PW166 (U21) and
THC63LVDM83A (U24).
(No)
The signal between
THC63LVDM83A (U24) and W5
is normal?
THC63LVDM83A (U24) and W5
is normal?
(Yes)
LCD unit cable and related parts
are normal?
are normal?
(No)
TV tuner Video Out output (Pin
12 of UT1) is normal?
12 of UT1) is normal?
(Yes)
5-V voltage is input to TV tuner
(Pins 3, 13 of UT1)?
(Pins 3, 13 of UT1)?
(Yes)
(Yes)
IIC bus (Pins 4, 5 of UT1) is
normal?
normal?
Check circuits around
THC63LVDM83A (U24)
and W5.
THC63LVDM83A (U24)
and W5.
(No)
Video signals (composite SCART
, S) are input to VPC3230 (UT8)?
, S) are input to VPC3230 (UT8)?
Check each video signal
line and AV connector and
cable.
line and AV connector and
cable.
(Yes)
(No)
3.3-V voltage is input to VPC3230
(Pins 10, 26, 29, 36, 45, 52 of UT8)?
(Pins 10, 26, 29, 36, 45, 52 of UT8)?
Check U10 and circuits
around it.
around it.
(Yes)
(No)
5-V voltage is input to VP3230
(Pins 59, 69, and 76 of UT8)?
(Pins 59, 69, and 76 of UT8)?
Check UT3 and circuits
around it.
around it.
(Yes)
(No)
IIC bus (Pins 13, 14 of UT8) is
normal?
normal?
Check IIC bus line and
around it.
around it.
(Yes)
(No)
The signal between VPC3230
(UT8) and PW1231 (U29) is
normal?
(UT8) and PW1231 (U29) is
normal?
Check VPC3230 (UT8)
and circuits around it.
and circuits around it.
(Yes)
(No)
The signal between PW1231
(U29) and PW166 (U21) is
normal?
(U29) and PW166 (U21) is
normal?
Check PW1231 (U29) and
circuits around it.
circuits around it.
(No)
The signal between AD9883A (U19)
and PW166 (U21) is normal?
and PW166 (U21) is normal?
Check circuits around
AD9883A (U19) and
PW166 (U21).
AD9883A (U19) and
PW166 (U21).
(No)
Check RGB cable and
connector W2.
connector W2.
Check RGB cable and
connector W2.
connector W2.
(No)
Check U19 and circuits
around it.
around it.
(No)
Check RGB signals from
W2 to AD9883A (U19).
W2 to AD9883A (U19).
(Yes)
(Yes)
The signal between AD9883A (U19)
and PW166 (U21) is normal?
and PW166 (U21) is normal?
(No)
Check circuits around
AD9883A (U19) and
PW166 (U21).
AD9883A (U19) and
PW166 (U21).
PC screen is not displayed.
Go to item
.
Go to item
.
Go to item
.
No TV picture is displayed.
No video appears
Go to item
.
Regulator (UT3) of 1 pin is input?
(Yes)
(Yes)
(Yes)
(No)
(No)
(No)
Replace UT3.
Replace U11.
Replace U12.
Regulator (U11) of 1 pin is input?
4pin of U12 have fallen
on ground ?
on ground ?
Check regulator Q2 and
LCDPWON signal.
LCDPWON signal.
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