Electronics > Repair
[FIXED] Venerable AIM TTI PL303QMD-P needs help - Overvoltage trip error
m k:
The chip has 8 inputs, have you tried comparing them?
It probably has the same stuff for left and right.
It's also possible that OVP is the first message and so misleading.
Means that only if there's no OVP other messages are appearing.
A bit far fetched, surely stuff like missing ADC is messaged before it.
Zucca:
Well I did not compare the good/bad side ADC inputs because the ADC inputs on the bad side make sense coming from the Sense lines...
More over I dig into the analog part and I coudn't find any error.
Tonight I compared at the SPIs good ADC and bad ADC, no major differences just looking at the signals/edge... still have to decode the traffic.
One more interesting find, if I swap the control boards again, the good one (was slave) at the master place report a FAIL 4 and won't turn on the output.
Once I reverted it, the error disappears and at least one side (slave) is working as expected.
Did not see a fail 4 on the bad one at the wrong place (master in slave)... mmmm hope the uP is not toasted.
m k:
Maybe you got a bad connection.
I don't like those IDC style connectors, too many times pin coatings are sub-standard.
And ribbon cable side knife connection is what ever after few twists.
Are there many possible serial bus connections out from MCU?
Maybe you can map most of them and find out how the thing is initialized.
Zucca:
thx m k, I am too tired to work on it tonight.
Here the startup video,
https://www.dropbox.com/scl/fi/1rs3myawu33dif7xj68vr/20240811_205119.mp4?rlkey=wenaqjdetib6d5u4kn7ly6tae&st=wsuwg4s9&dl=0
uP is booting, then goes in error mode ovp immediately.
Zucca:
SPI madness...
Now I just have to do some homework...
FUUUU I was not expecting such a hard job, it is just a damm power supply!
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