Sharp LL-T1501A (serv.man12) Service Manual ▷ View online
[2] DISASSEMBLY AND REASSEMBLY OF
LCD
1. Remove the two screws
. Lift the rear panel
in the direction
indicated by the arrow and remove the two connectors
.
2. If necessary, remove the four screws and remove the front panel.
(Do not remove the LCD module and I/F board.)
3. Remove the four screws
and remove the LCD unit
and
angle
.
4. Remove the two connectors
and four screws
. Lift the LCD
unit in the direction indicated by the arrow.
Remove the two screws
and remove the connector
.
5. Remove the five screws
and cables. Remove the I/F board
.
6. Remove the two screws
and cables. Remove the inverter
board .
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[3] Disassembly and reassembly
1. Remove the seven screws
securing the base metal
.
2. Remove the four screws
securing the hinge.
3. Remove the screw
securing the hinge.
4. Remove the screw
securing the grounding wire. Remove the
base metal
.
5. Remove the four screws
and remove the USB board
.
6. Remove the three screws
. Lift the power supply board
in
the direction indicated by the arrow. Remove the two connectors
.
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CHAPTER 4. TROUBLE SHOOTING
1. SYSTEM ARCHITECTURE
2. NO POWER
(AC power indicator is not lighted and no display)
POWER
OUTLET
OUTLET
POWER
SWITCH
SWITCH
POWER BD
COMPUTER
USB BD
SENSOR BD
KEY CTRL BD
INTERFACE
BD
INVERTER
BD
LCD MODULE
3. PC NO DISPLY OR DISPLAY ABORMAL
(AC power indicator is lighted)
NO POWER
1. CHECK IF POWER CORD IS
CONNECTED PROPERLY.
2. TURN ON POWER SWITCH.
CONNECTED PROPERLY.
2. TURN ON POWER SWITCH.
POWER OK?
END
YES
NO
YES
NO
POWER OK?
REPLACE POWER CORD
AND RE-TEST
PEPLA CE
POWER BOARD
YES
YES
NO
NO
NO
END
YES
NO or BAD DISPLAY
DISPLAY OK?
DISPLAY OK?
CHECK THE SIGNAL CABLE
FROM MONITOR TO PC IS
CONNECTECD PROPERLY.
FROM MONITOR TO PC IS
CONNECTECD PROPERLY.
1. CONFIRM THE WIRE BD
INSTALL TO LCD PANEL
PROPERLY.
2. TRY ANOTHER KNOWN
GOOD LCD PANEL
INSTALL TO LCD PANEL
PROPERLY.
2. TRY ANOTHER KNOWN
GOOD LCD PANEL
REPLACE I/F BD
OR TRY REPLACE
THE CABLE WHICH
FROM I/F BD TO
SENSOR BD
OR TRY REPLACE
THE CABLE WHICH
FROM I/F BD TO
SENSOR BD
DISPLAY OK?
1. CONFIRM INVERTER BD IS GOOD.
2. CHECK ALL THER CABLES FRON
INVERTER BD TO I/F BD ARE
CONNECTED PROPERLY.
2. CHECK ALL THER CABLES FRON
INVERTER BD TO I/F BD ARE
CONNECTED PROPERLY.
4. ADJUST CONTROL BUTTON NO
FUNCTION
FUNCTION
END
YES
NO
5. ADJUST BRIGHNESS NO FUNCTION
END
YES
NO
NO
YES
YES
NO
KEY CONTROL BUTTON
NO FUNCTION
CHECK THAT CABLE FRON I/F
BD TO KEY CTRL BD IS
CONNECTED PROPERLY
(REFER THE KEY CTRL BD &
I/F BD DISASSEMBLY)
BD TO KEY CTRL BD IS
CONNECTED PROPERLY
(REFER THE KEY CTRL BD &
I/F BD DISASSEMBLY)
FUNCTION OK?
FUNCTION OK?
REPLACE KEY CTRL
BOARD
REPLACE I/F BD OR
TRY REPLACE THE
CABLE WHICH
FROM I/F BD TO
KEY CTRL BD
TRY REPLACE THE
CABLE WHICH
FROM I/F BD TO
KEY CTRL BD
FUNCTION OK?
FUNCTION OK?
REPLACE I/F BD OR
TRY REPLACE THE
CABLE WHICH
FROM I/F BD TO
SENSOR BD
TRY REPLACE THE
CABLE WHICH
FROM I/F BD TO
SENSOR BD
1. CHECK THE OTHER FUNDION
KEY AVAILABLE.
2. CHECK THE CABLE FROM I/F
BD TO SENSOR BD IS
CONNECTED PROPERLY.
KEY AVAILABLE.
2. CHECK THE CABLE FROM I/F
BD TO SENSOR BD IS
CONNECTED PROPERLY.
PHSH HOT KEY NO
FUNCTION
1. REPLACE KEY CTRL
BOARD
2. REPLACE SENSOR BD
BOARD
2. REPLACE SENSOR BD
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