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(Fixed) No signs of life CV1000 - Help!

kasaski

kasaski

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Hi all,
I have a dead cv1000 with no signs of life, no flashing LED's or anything. This board worked previously but unused for some time, checked the PSU and used another cv1000 i own and it worked fine on the same cabinet.

After poking around a bit i have found there is no 3.3v being generated for the logic IC's, its measures 0.1v vs perfect 3.3v on my other pcb. At first i thought the regulator on the top right of the board might be to blame, but after searching more chip ID's i have found there are two DC-DC converters (2651MTC-ADJ) on the bottom left beneath the sound amp which are more likely the culprit. The circuitry is difficult to pinout and trace so if anyone has any pointers on where to look and what else to test before i go ahead and swap these chips and hope for the best, that'd be great.

Thanks.
 
Last edited:
Seems like something could be shorted. Id check the 5v input to ground with your meter. The datasheet is available for that chip from Ti and it is still an active part. Assuming that is the issue. You can work back from it.
 
Had some time today and probed out most parts around the dc converter's and compared with a working board. Everything seemed fine, went to probe the bad board again and noticed irregular readings when checking known traces around the 3.3v converter.

Gave u29 a reflow and LEDs are lighting up and it boots up just fine now! Guess it was just a dry joint on the chip

Was so hesitant to put an iron on this board that i sat on such a simple fix for so long lol.
 
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