No video picture, no sound.
Change C13,Q4,Q3
No video picture,
no sound.
Check if the reset circuit consisting
of C13, Q4, Q3,R11,R12,R13,R15,R16 is normal
(at a high level for tens of milliseconds,
then constantly at 0V).
Check whether there is
27MHz signal output.
Check if there is 128MHz
signal output on R49.
Check the loaded circuit
Crystal oscillator Y1 and
peripheral components
are defected or eroded.
Check whether
short-circuit or bad
solder on U3, U4
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Reconnect the component in
short-circuit
Check U3.
27M waveform
SDRAM(R49 SDCLK) waveform
Check whether all the
voltages from the power
board to the decoder board
are normal.
CVBS(L27 point) waveform
Trouble shooting chart
Go
No
5-8
Summary of Contents for DVP3320/94
Page 28: ...7 9 MAIN BOARD TOP ...
Page 29: ...7 10 MAIN BOARD BOTTOM ...
Page 30: ...LED PCB BOARD TOP 7 11 ...
Page 31: ...LED PCB BOARD BOTTOM 7 12 ...
Page 32: ...USB PCB BOARD TOP 7 13 ...
Page 33: ...USB PCB BOARD BOTTOM 7 14 ...
Page 34: ...POWER SW PCB BOARD TOP 7 15 ...
Page 35: ...POWER SW PCB BOARD BOTTOM 7 16 ...
Page 36: ...8 0 Mechanical Exploded View Diagram 8 1 ...
Page 39: ...9 0 REVISION LIST Version 1 0 Initial release ...