Electronics > Repair
[FIXED] Venerable AIM TTI PL303QMD-P needs help - Overvoltage trip error
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Zucca:


Basically the master right part shows the Output trip error and become irresponsive to any button press.
It is a for parts ebay purchase, the price was low and I could not resist.

Still have to try to connect by ETH and see what it is going on by reading the error codes.

Meanwhile I am doing my homework, if somebody knows something about this problem... I would appreciate any help.

Teardown and more analysis will be here soon, stay tuned!

Thanks!
m k:
Maybe you can gain something by swapping feedbacks.
ace_ventura:
I have the PLH version and this error means overheating. I had the same error with faulty connection to TIP31A transistor for temperature measurement located on the common heat sink.

Zucca:
Thanks ace_ventura... unfortunately I have to fix my truck first then I will have time to attack the PL303QMD.
Looks promising... can't wait to open it up and see.

here the datasheet
https://www.st.com/resource/en/datasheet/tip31a.pdf

oh I did not know that:
https://www.ti.com/lit/pdf/sboa433

so they are using a BJT as a temp sensor?
ace_ventura:
Yes, that's right. The fan is controlled by PWM according to the temperature sensing by BJT.

You can check inside compartment of PL601 in the thread by Baliszoft https://www.eevblog.com/forum/reviews/thurlby-thandar-not-a-happy-bunny/msg146518/#msg146518

I cannot find schematic or SM for this type of power supply but I took inspiration from the TTi QL series. On KO4BB website: http://w.ko4bb.com/getsimple/index.php?id=download&file=06_Misc_Test_Equipment/Thurlby_TTi/TTi_QL_Series_Bench_Power_Supply_Service_Manual.pdf on page 44 (fan control). Output section with MOSFET is also very similar.
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