Electronics > Repair
[FIXED] Venerable AIM TTI PL303QMD-P needs help - Overvoltage trip error
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Zucca:
DISCLAIMER: I never reworked a SSOP28.

I did it without microscope.... long story.... you don't wanna know...

Here the awful result: not centered at all.



I did cleaned the pads, eyeballed the chip and soldered it down
Next time I will presolder the pads and then let the hot air do its magic.
Yes I used tacky flux, no worries.

Then I give it a shot and FUUUU YES! No more OVP Trip!

Now I have to fully test my repaired  PL303QMD.

Finally I just want to thank m k and Gertjan for helping me in this madness.

PS: C18, C17 and C15 will be installed once I am sure that ADS1241 is installed correctly..

More to come! FW Upgrade? Calibration? yummm...

mk_:

--- Quote from: Zucca on September 04, 2024, 03:23:06 am ---DISCLAIMER: I never reworked a SSOP28.
 
Here the awful result: not centered at all.
 

--- End quote ---

Well done... and who cares about not perfect alligned pads as long as they don`t short to others? The lid hides those little lapsi
ArdWar:
No bridges, no overhanging pins, no one notices if not for the shiny lead.
Gertjan:
Hi Zucca,

Well done!  :-+ :-+
Congratulations with a well deserved successful repair! You did the extra mile, and it paid off.  :)


--- Quote ---Next time I will presolder the pads and then let the hot air do its magic.
--- End quote ---
I would not do that. Hot air is splendid for small SMD IC packages, like TQFN. You heat the whole package, and it will float in place when all solder has melted.

In my experience with a (relative) larger package, like this ADS1241, it is best to solder it just like you did:
- Clean the pads
- Add some flux
- Position the new IC, and solder two opposite corner pads.
  (After tacking the first corner pad, check position of the IC, and adjust if necessary, then solder opposite corner pad)
- The IC is now held in place, solder the rest of the pads.

This is how I do it without much problems. Only difference is that I use a microscope.
(But your handy-work does not look too shabby too... :) )

Lastly, do not tinker too much with your PL303QMD. Just use it, and start to enjoy and appreciate it!

regards, Gertjan.
m k:

--- Quote from: Zucca on September 04, 2024, 03:23:06 am ---Here the awful result: not centered at all.


--- End quote ---

It's a camera effect, see C19.

If you ever start having intermittent issues, check through holes.
Factory tin is thin.
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