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philips cd104 tda1540 NOS modify error...
philips cd104 tda1540 NOS modify error...
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Old 7th October 2018, 02:58 PM   #1
poki921 is offline poki921  Taiwan
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Default philips cd104 tda1540 NOS modify error...

Dear all
I've modified my philips cd104 to NOS mode
It works normally at first
But after two hours the sound sounds twittered and noisy.
Here are three pic attached
With playing the testing cd I made that produce continuous 1k wave
The first two picture are from left and right from cd104 after the op I/V
The last one is the normal result by my cd 304mk2 .

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Thx!!
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Old 7th October 2018, 03:09 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Check the steel feed through pins on all pc boards.
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Old 7th October 2018, 03:12 PM   #3
poki921 is offline poki921  Taiwan
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Quote:
Originally Posted by JonSnell Electronic View Post
Check the steel feed through pins on all pc boards.
checked! I've re-soldered them all and put a cooper thru inside.
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Old 8th October 2018, 02:38 AM   #4
rfbrw is offline rfbrw
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Try using freezer spray.
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Old 8th October 2018, 03:30 AM   #5
poki921 is offline poki921  Taiwan
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Quote:
Originally Posted by rfbrw View Post
Try using freezer spray.
Donít get the point??
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Old 8th October 2018, 11:17 AM   #6
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Quote:
Originally Posted by rfbrw View Post
Try using freezer spray.
That will help to pin point a faulty component, if there is one.
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Old 8th October 2018, 11:44 AM   #7
poki921 is offline poki921  Taiwan
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I only use the freezer to test the oscillation of the IC before
Don’t know the methods to debug the failure of pcb
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Old 9th October 2018, 09:35 AM   #8
canvas is offline canvas  Taiwan
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I've seen similar waveform before. It was due to the wrong bit length setting from the source, e.g. input 24bits stream into a 16bit DAC.
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Old 9th October 2018, 10:19 AM   #9
poki921 is offline poki921  Taiwan
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Quote:
Originally Posted by canvas View Post
I've seen similar waveform before. It was due to the wrong bit length setting from the source, e.g. input 24bits stream into a 16bit DAC.
Ya same guess from me
Maybe there will be some signs by duo channel measurements
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Old 9th October 2018, 11:31 AM   #10
poki921 is offline poki921  Taiwan
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Sorry
Forget to mention that if replace the decorder PCB
Trouble fixed so the problems might be in the decoder board.
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