AOC LE50U7570/69 - Page 32

Document: After-sales Maintenance Service Manual No.: T7** Version: 3.0 Effective from: March15th, 2010
Page of 14 KTC
1
After-sales Maintenance Service Manual
Date: March 2010
1. No power
2. Without light
Check 220V power supply voltage
and the contact of power socket
Check AC（220V） voltage and the
contact of CN101 socket.
Check +5V and +12V output from
embedded power supply for abnormity
Check +5V and +12V on
main board for abnormity
Replace power cord or power
socket
Check for open-loop of fuse,
or replace main board
Check main board of power supply for
looseness, open-loop and poor contact
YES
NO
YES
NO
YES
NO
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
Check the fuse on high-voltage board for
the supply of 12V
Check each triode of control part for
abnormity or replace main board
Replace high-voltage switchboard
Check fuse
YES
YES
NO
NO
Abnormal output voltage +5V and +12V from
embedded power supply, replace embedded
power supply with the same model
Troubleshooting Procedure
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