Hardware Missing USB C pads, won't turn on

[ds34]

Hi there, a friend of mine gave me one of his Switches that he "worked on" before.
I cleaned up this mess and found out that there are several pads missing.
Whatever, I tried to turn it on with a charged battery, but the screen won't turn on.
M92T36 is working fine, so I assume that the BQ chip is also fine

 

[ds34]

The blue marked capacitor has shorts to ground. Should I replace it or is the SoC dead?
No capacitors on B side have shorts.

 

[FXDX]

Rebuild all the lifted pads and then see if the switch charge. I don't think the SoC Tegra is broken.

 

[ds34]

Why is the cap shorted then?

 

[ds34]

I don't want to "waste" hours on rebuilding the pads without knowing if it's fixable

 

[Pintglass]

Why is the cap shorted then?

Are you just testing with your multimeter in beep mode, if a certain cap is on a low resistance rail your meter may beep but it doesn't mean that its shorted.

 

[ds34]

Can I remove this capacitor with hot air and measure it outside the circuit?

 

[Pintglass]

Can I remove this capacitor with hot air and measure it outside the circuit?

To be honest you may as well take it off as this switch will probably end up like your other one.

 

[ds34]

Don't say that lol. M92T36 is working fine. BQ24913 must be fine too, right?

 

[Pintglass]

Don't say that lol. M92T36 is working fine. BQ24913 must be fine too, right?

Are you saying that the switch charges if so how have you tested this?

 

[ds34]

I didn't test it. But there are 3.8 volt on pin 5 and 3,76 volt on pin 6 at M92T36

 

[Pintglass]

I didn't test it. But there are 3.8 volt on pin 5 and 3,76 volt on pin 6 at M92T36

What voltage do you get on the highlighted test pad in the image attached, with the battery plugged in.

 

[ds34]

Which highlited test points?

 

[ds34]

Found it

 

[ds34]

4.03 v

--------------------- MERGED ---------------------------

4,0 Volt in rcm mode

--------------------- MERGED ---------------------------

Once I turn it on it goes to 3.99v

 

[Pintglass]

4.03 v

--------------------- MERGED ---------------------------

4,0 Volt in rcm mode

--------------------- MERGED ---------------------------

Once I turn it on it goes to 3.99v

How do you know its in rcm mode?

 

[ds34]

I removed the MMC chip

 

[ds34]

My working Switch goes into RCM mode when I remove the MMC chip

 

[ds34]

I have 3,28v on pin 5 and constant 3,3v on pin 6 of M92T36.
When it's turned off I get 4,01 volts on that testpoint.
When I turn it on I read 3,94v
When I boot into RCM mode by removing the MMC I read 3,92v

 

[Pintglass]

What voltage's do you get on the points next to M92T36 that I've highlighted in the image attached with the switch powered on