Hardware Switch charging at 0,43a but no screen

[SlegBE]

Hello,

I'm looking for help for a Switch who worked perfectly before resetting it.
A weird behavior because at startup USB meter show 0,43a then 1,4a and drop to 0,43a after few second.
I can hear the touch screen working and sound but nothing at screen even backlight is on.

I swaped with another LCD without success.

On the board I've noted a short on a caps near MAX77620 and several shorts on SoC caps (see picture).
I took measurement on different components but I see nothing obvious excepted that both bucks converter have only 0,80/0,85v (battery plugged and Switch powered on)

M92T36 pin 5/6 shows 3,28v and chip is changed but no improvement.

Can you please advice me for troubleshooting this problem.

 

[andres1234]

hi
i know this capacitor have bot extreme to ground. i have a lot of board and alls, working or not, have this pieze to the ground, the 2 bobines near too have both extreme to ground.

if you can check this video, problem with baklight , both nintendo switch lite and switch normal use a same IC in th backlight

 

[SlegBE]

Thanks, I already follow the channel

I already checked the backlight components.

But it is not a backlight problem because I see Nintendo and Switch logo at power on. Sometimes I see battery logo few second when docked.

Black screen appears after Switch logo. I can hear the touchscreen working but nothing on screen.

I don't see any shorts near PI3USB. Nothing else excepted caps on my picture.

 

[SlegBE]

Thanks, I already follow the channel

I already checked the backlight components.

But it is not a backlight problem because I see Nintendo and Switch logo at power on. Sometimes I see battery logo few second when docked.

Black screen appears after Switch logo. I can hear the touchscreen working but nothing on screen.

I don't see any shorts near PI3USB. Nothing else excepted caps on my picture.

 

[andres1234]

u check the diodes?