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Step 7: 1st DSP
A
k
CN351 (Pin 20) RESET
r
CN351 (Pin 16)
For the following diagnosis, a digital oscilloscope must be used. SPICLK
Is the logic of RST_1 "H" ?
No
Check the output from the DIGITAL MOTHER Assy.
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the output from the DIGITAL MOTHER Assy.
m
Yes R122
s
Yes R124
B
Is the logic of RST_1 "H" ? Yes Is the logic of RST_1 maintained
No
Check the parts and patterns in the path.
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the parts and patterns in the path.
at "H"? (Does it fall to become "L" periodically?)
No
It is likely a boot error. (It is very difficult to diagnose which peripheral part of the DSP is in failure.)
t
Yes CN351 (Pin 19) MOSI
n
C
Yes R102 REQ_1
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the output from the DIGITAL MOTHER Assy.
Does the logic become "H" for a moment when the input stream is changed?
u
No The 1st DSP is in failure. Replace it.
Yes R126
o
Yes CN351 (Pin 21)
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No
Check the parts and patterns in the path.
D
Does the logic become "H" for a moment when the input stream is changed?
v
No Check the parts and patterns in the path.
Yes R125 MISO
p
Yes CN351 (Pin 17) SPIDS_1
Is the clock signal output while the voltage at SPIDS_1 is "L"?
No The 1st DSP is in failure. Replace it.
Does the logic become "L" for a moment when the input stream is changed?
w
No Check the output from the DIGITAL MOTHER Assy.
Yes
CN351 (Pin 18)
q
E
Yes R123
Is the clock signal output while the voltage at SPIDS_1 is "L"? Yes No Check the parts and patterns in the path.
No
Check the parts and patterns in the path.
Does the logic become "L" for a moment when the input stream is changed?
It is very difficult to diagnose which part is in failure.
F
198
1 2
VSX-74TXVi
3 4
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