UTCOMP Pro does not work anymore

[ArT]

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:

[liryc]

this is what i have
and DC/DC converter is very hot (6-7-8-9-10)

[ArT]

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]

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

[liryc]

So...
i try to figure why it does not work.
i should have 0V on pin 7 because is Ground.

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 ?

[ArT]

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)