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② DVB-T power supply abnormal
U10 pin4 should
be 5V
③ main chip works abnormal
④ DTV image abnormal
DVB-T power supply abnormal
Check the power supply of power board
U7 pin4 should
be 3.3V
Main chip of DVB-T
works abnormal
If work frequency of
crystal Y1 is 20.25MHz
The frequency of R15
should be 129.6MHz
Check if flash write
the correct software
DTV
image
DVB-T abnormal
Check if J03 wave of
video output is normal
The work frequency of crystal Y1
should be 20.25MHz, ±20ppm error
U6 pin4 should
be 1.8V
of
39
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