Read Sharp LL-T1511A (serv.man12) Service Manual online
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.
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