Acer AT4250B Service Manual page 31

Start
Connect with AC
power code and RF
cable
Press Power
On/Off
Button to LED
color show green
No TV signal
No signal
No
NTF
END
Chapter3
NO TV SIGNAL ISSUE
Upload F/W
Swap test fixture
Yes
Tuner Board
No
broken
No
Replace
Tuner Board
Replace
Yes
Main Board
25