Nintendo switch no short charges fine battery full but no boot no sound

[ss45]

As the title says I have 2 switches showing the same symptom.

After quick investigation I found no short on usb c power of or video chip.

Initially the batteries was flat, after leaving it a while to charge they got full just fine. While charging the battery icon was not shown on screen. Using usb meter gave usual reading that is [email protected], [email protected] during early and middle of charging cycle respectively

To check if the battery is charged or not I teardown the unit and directly probe battery terminal which gives 4.17 volt more or less .

Pressing power button doesn't give any response, no sound or picture. Long pressing do nothing either

I am really confounded and hope gurus and masters here could point out possible fix

Thank you

[digby1951]

https://logi.wiki/index.php?title=Ga...ClCwnHCzaCuwVU


ohms readings......may help find ur fault.....switch light and switch

[ss45]

Turns out the backlight has died when I shine with flashlight I can confirm lcd shows homescreen just fine. Any idea which circuit powers the backlight ?

[digby1951]

https://www.youtube.com/watch?v=mZl9Mnfes_k

he's not an expert but may help you

[elecsoluces]

Backlight is a part of the screen, did you test a known good screen?