820-00928 troubleshotting CD3215

[No-Clean]

Clean board, 3 ports make the usb meter restart every 5-6 seconds one port stays on, as far as I have read and seen videos there is no clear way to determine if a CD3215 is bad or not, in this particular case I would guess that those 3 ports are the ones with bad CD3215 since they are all getting 3.3v on pins 53 and 62 and only one has not restarting issues.

Now my question here is are there any other tricks to determine if a CD3215 is bad, I know that if one of them is bad in this case there are 4 CD3215 on this board then the board will not start, this makes it difficult to repair this boars, also I have had issues in the past with bad "new CD3215" chips, so this is even worse for fixing and troubleshooting.

Thanks for input.

 

[No-Clean]

For now what I do to test the CD3215 is to test them on a 820-00840 that I have here with a dead CPU but all else works.

 

[tcampbell34]

If the amp meter loops when you plug it in, that means that the corresponding CD3215 chip should be working fine actually. The issue should be on the one port that does not loop and just stays on.

 

[No-Clean]

Thanks a lot!

 

[No-Clean]

I have some CD3215B03 chips, seems like those only work on some boards, for example on this 820-00928 they don't work.

 

[2informaticos]

Compare diode mode readings on all LDO outputs of CD3215 chips.
Or change directly the chip which doesn't pulse.

 

[No-Clean]

Noted, thanks!