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PostPosted: Wed Apr 24, 2019 5:04 am 
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Joined: Sun Jun 12, 2011 12:06 pm
Posts: 488
Location: Poland
I was experimenting one day with replacing regular 7805 with a step-down one based on LM2596. Unfortunately, I forgot to solder one leg of the output capacitor. As a result (this is just my suspicion) - output voltage has risen very quickly over 5V before the feedback loop of this chip could react and it burned my PPU.
Since that time I am sceptic to non-linear regulators, especially that when I soldered the cap correctly and replaced PPU, i found out a little horizontal bars in the video which were not present when I replaced it with 7805 - probably the 100kHz switching freuqency adds significant noise.


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PostPosted: Fri May 10, 2019 1:37 pm 
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Joined: Tue Mar 22, 2016 8:27 pm
Posts: 318
Location: Minnesota, USA
It turns out the level shifters I have are similar but actually different, so I am not able to replace them... Not sure where to go next with this. It would be great if I could eliminate the CPU interposer card somehow. Right now I do not know if there is something wrong with the main board or with the interposer. It seems unlikely that this is the PPU interposer but still not impossible I guess.


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