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CHAPTER 7:
EASY TROUBLE SHOOTING
7.1 Troubleshooting for Common Use
Note: Before opening the cabinet and working on the repairs, please read the troubleshooting and Q&A
attached in theuser's manual, which has covered most of the problems caused by unproper using or settings to
the TV set. If that does notwork, please carry out the easy troubleshooting before checking or replacing the main
parts of the television. The
troubleshooting guides given below base on the situation in which the TV's functions are set and used
properly.Plus, if the easy troubleshooting can not help, please work on the repairing according to the procedures
given in chapter 5,Exception Handles.Check the connection and condition of wires and inlets that relate to power
board, including the AC power inlet, the power incoming wire, wires between power board and mainboard, etc.
TV can not be turned on
Check the diagram arround power board to see If there exists a short circuit or creepage.
Check the sleep timer setting.
Auto turning off
Check the surrounding diagram of power board. The problem is most possibly caused by short circuit or wire
breakage,
because this kind of malfunctions can cause excessive current, which will make the power board startup
self-protection.
If the TV screen can not display after the blink, that means the panel or other parts of equipment is broken (most
likely by
unproper input voltage). Ensure the input voltage of every component, and then check the part that is suspected
damaged.
The screen goes black after a shorting blink
If the panel can work normally at the other time, it may be caused by bad mainboard. Upgrade to the latest
software first,
if that does not work, attempt to change the mainboard.
There exists afterimages after power off
If this problem occurs repeatedly, check the surrounding diagram and connections of panel inverter board. Also,
the
blacklight unit and LCD lamps should be checked out.IListen to the squeak carefully to make sure where the noise
comes from. If it is from speakers, the voice may be caused by bad speakers. Change them for a try..
There exists squeak when TV is working
If the noise comes from the inner parts of cabinet, it may be produced by abnormal AC current in power board.
Change the
board and check its surrounding circuits for a try.Check the routing of wires inside the cabinet to suppress
interference.
The power board may be bad. Please change the board for testing. If it cannot help, refer to the chapter 5 for more
intensive information.In addition, the malfunction of LCD panel can cause failure of power on. Please refer to 4.2
Troubleshooting for Displayingfor more information.
7.2 Troubleshooting for Displaying
Check the power board output and main board input ports to make sure whether the TV has been turned on
successfully,
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