UTCOMP Pro does not work anymore

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ArT
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Re: UTCOMP Pro does not work anymore

Postby ArT » Wed Jan 25, 2023 7:03 am

Seems like DC/DC converter on OLED board is faulty or microprocessor on OLED board (chip on glass - can not be replaced) is faulty and drain to much current. Please measure voltages on 2 DC/DC converters, I marked 10 points:
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UTCOMP-PRO_OLED-Voltages.jpg
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liryc
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Re: UTCOMP Pro does not work anymore

Postby liryc » Wed Jan 25, 2023 11:09 pm

this is what i have
and DC/DC converter is very hot (6-7-8-9-10)
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0.36v.jpg
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ArT
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Re: UTCOMP Pro does not work anymore

Postby ArT » Thu Jan 26, 2023 7:15 am

Ok, it may be DC/DC converter faulty or driver on OLED. Please replace this chip marked with pins 6-10, it's MP1541 / MP1541DJ in SOT23-5 package: https://www.monolithicpower.com/en/mp1541.html

liryc
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Re: UTCOMP Pro does not work anymore

Postby liryc » Fri Feb 10, 2023 7:22 pm

hello,
i have change the component "MP1541DJ"
result on screen is similar (with horizontal line at the end).
But component is not HOT anymore

https://youtu.be/xeI6pWPrqwQ

my component "MP1541DJ" :
https://fr.aliexpress.com/item/1005005046982089.html
Attachments
écran 10.02.23.png
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liryc
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Re: UTCOMP Pro does not work anymore

Postby liryc » Sat Feb 11, 2023 1:03 pm

So...
i try to figure why it does not work.
i should have 0V on pin 7 because is Ground.
Image
But i have no Ground to this pin. I almost sure i have damage the bord during the desoldering of old component.


So i try to made a new ground from other tab :

And the screen was alive ! Not sharp contrast but alive.
https://youtu.be/tNA5Y-3XD1o


And after ... blackout. And no more +5V ... but 0.2V only :?
What is my mistake ?
Attachments
IMG_20230211_124406.jpg
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IMG_20230211_121706.jpg
IMG_20230211_121706.jpg (402.44 KiB) Viewed 2815 times
0.2V.png
0.2V.png (3.6 MiB) Viewed 2815 times

ArT
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Re: UTCOMP Pro does not work anymore

Postby ArT » Mon Feb 13, 2023 6:36 am

It can be short circuit on your wires or cable length - this element should be assembled onboard with as short wires as possible. Broken pin with ground can be soldered from other place.

Does UTCOMP is still working with other display? Because it seems like now UTCOMP is not giving voltage - it may be broken internal switching transistor. Please check it on ignition switch ON (on ignition switch OFF voltage is disabled)


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