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No sound No picture No light
Check if the power cord
is correctly connected
Check if there is voltage
pressure in pin6 of J16 (5V),
other:
can' t control
Replace Remote
Control Board or
key board.
No
Yes
No
Yes
Check if LD23（1.2V ）、
U104（1.8V）、LD22（
3.3V
working
Yes
Chang
U1
- 42 -
Connect the
power cord to the
socket
Replace the Power board
is
No
Chang UD9 or U104 or UD8
Still having
problems
Change
Mainboard
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