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Troubleshooting Procedure
1. No power
YES
Check +5V and +12V output from
embedded power supply for abnormity
YES
Check +5V and +12V on
main board for abnormity
YES
Check for open-loop of fuse,
or replace main board
2. Without light
When the indicator is on but there is no display, check remote control for
power-off, minimum brightness, contrast ratio, check high-voltage switchboard
controlled by main board for abnormity
YES
Check the fuse on high-voltage board for
the supply of 12V
YES
Replace high-voltage switchboard
1
Page
Check 220V power supply voltage
and the contact of power socket
Check AC（220V）voltage and the
contact of CN101 socket.
Abnormal output voltage +5V and +12V from
embedded power supply, replace embedded
power supply with the same model
31
of 14
Replace power cord or power
socket
Check main board of power supply for
looseness, open-loop and poor contact
Check each triode of control part for
abnormity or replace main board
Check fuse
KTC
NO
NO
NO
NO
NO
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