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5.2. Troubleshooting
Please take note of the following two points with regard to troubleshooting:
1. Know-how of diagnosis upon occurrence of heavy troubles, e.g. 'Set cannot be turned ON', 'Set fails to start', 'No display on
screen', etc.
2. Explanation of each trouble, mainly symptom of trouble in operation.
Flow Chart
START
START
Set cannot be supplied with current.
Power lamp fails to light up.
Dark display on screen.
Screen fails to display.
Failure in starting
Lines appearing on screen.
Part of block displayed
Properly on screen.
Touch screen cannot be input.
Starts but operates unstably.
Pay attention to the following points when in pursuit of the cause of a troubleshooting.
1. Peripheral apparatus connected with the set should all be removed before operation check.
2. Make sure that cables, boards, etc. are not coming off, and recheck the contact condition.
NG
Power unit
Output voltage
OK
NO
Power lamp
check
YES
NG
Inverter
Board input/output
voltage
OK
NO
LCD back
light lighting
YES
NO
operating check
YES
NG
Result of
Selt Test Program
OK
NG
Replace
LCD Unit for trial.
OK
Replace LVDS board and cable.
Make sure of contact of Touch screen connector in use.
Replace Touch screen or main board.
.
Reinstall firmware/software.
Replace main board.
START
END
5-2
Replace power unit.
Check contact condition of power input terminal. Replace if defective.
Check SW cable continuity. Replace if defective.
Check SW board connection and contact. Replace if defective.
Replace inverter board. (Check if fuse is broken).
Check inverter cable continuity. Replace if defective
Replace LCD back light.
Replace main board
(Check fuse at power source).
Replace main board.
Replace
main board
for trial.
OK
Replace main board.
Heavy trouble e.g.,
'Set cannot be turned
ON', 'Set fails to start',
'No display on
screen', etc.
Each kind of
trouble in
operation.
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