So... i try to figure why it does not work. i should have 0V on pin 7 because is Ground. https://media.monolithicpower.com/catalog/product/cache/ccb9ba928e4f463ae145b55d0127b66f/M/P/MP1541_184_1.jpg But i have no Ground to this pin. I almost sure i have damage the bord during the desoldering of old ...

hello, i have change the component "MP1541DJ" result on screen is similar (with horizontal line at the end). But component is not HOT anymore xeI6pWPrqwQ https://youtu.be/xeI6pWPrqwQ my component "MP1541DJ" : https://fr.aliexpress.com/item/1005005046982089.html

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

i have a constant 4.7V here
And i feel HOT component arround here (not sure witch one on both)

Please check if you have +5V on display (with ignition switch ON), maybe tape is corrupted. Can you show me where i need to check the 5V on the display please ? Is it new screen? No, old faulty one. (but with another new screen, it's ok) Does it have correct configuration of RS1/RS2 jumpers? Sorry,...

Buzzer should work. Please disconnect display and check buzzer and buttons (you should hear clicks). If buzzer and buttons are working, you can connect new display to your module because probably only display is damaged. But first make sure that you have not more than +5,2 on power lines (e.g. DS18...