Unofficial Nextion/TJC User Forum

Accidental overvoltage - any repair suggestions?

I accidentally applied near 12v to the 5v input of my Nextion 4.3" enhanced… twice!
Yes I burned 2 screens… my buck regulator circuit puts out 5v most of the time, but occasionally puts out 12v… resulting in this damage.
Im back on a reliable 5v source now, and trying to repair my screens.
Both screens respond to serial messages, so something is working, but the display is dead.
I have checked U7, the linear regulator close to the power input.
It is still putting out 3.3v.

Can anyone suggest anything else I can try to repair these 2 screens?

Model number NX4827K043_011.


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