5. White screen after power-off (work normally when power on, but when power-off or
no signal input, the screen shows a white screen)
6. TV without channel or with color cast
Check whether there is change of voltage at the high voltage
board controlled by main board when power-on and power-off
Check whether the voltage change of the control pins on
the plug interface of high voltage board is normal when
power-on and power-off
Check whether the voltage of the pin on main chip
controlling the working voltage of high voltage board is
normal when power-on and power-off
The circuit
related to
high voltage
board is poor
Check whether the lines
between main board and high
voltage board is in open-loop
or poor contact
Check relevant circuits of
high voltage board
controlled by main board
Replace poor main
chips or recopy
software
Check TV antenna plug for looseness and
poor contact
If with color cast, check the setting of
color system under menu; and change
of color system to see whether it is
normal (Usually set to automatic)
Check the antenna and its signal
source, if no problems exist, replace
tuner or control chips with the same
model
22
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