Hardware Switch USB Data line D- reading as OL

[note9]

Hello, I have an unpatched switch that's not recognised by PC so i cant send a payload. It can charge fine. measured the usb pins and on the A7 D- pin i get OL, A6 D+ i get 0.781 using diode mode.
anyone have a solution?

thanks

 

[FXDX]

If the USB port is OK, then you need to turn your attention to the MAX77621, MAX77620 chipsets and nearby capacitors. If everything is ok there, it is possible that the problem is from Tegra SoC, where you can try a reball.

 

[thesjaakspoiler]

You somehow seem to be missing the diode component marked '7C' in your picture
(below the component where you drew the pink lines).
I'm not sure if that matters.
Compare it with this picture :
https://gbatemp.net/threads/nintendo-switch-motherboard-losing-a-component.546922/

If the problem is the Tegra, you could try applying some moderate force to Tegra while trying to injecting the payload.

 

[note9]

@FXDX, are the USB data lines connected to those MAX chipsets?


@thesjaakspoiler, I took it out, it was shorted. Some boards don't have it.

 

[note9]

took out the usb-c port and now that line is showing as shorted to ground.

 

[FXDX]

took out the usb-c port and now that line is showing as shorted to ground.

Reball or reflow Tegra SoC.

 

[Ttm3]

Reball or reflow Tegra SoC.

I've had several of these where the pins in the charge port get bent. This can short the chip in the data lines just above the charger or open the filter just above that resulting in no access to RCM. I've also had it damage the tegra. System still works as normal but the data lines won't communicate with tegra resulting in no access to RCM

 

[note9]

Reball or reflow Tegra SoC.

i'll try reflowing as i only have a hot air station at the moment.

I've had several of these where the pins in the charge port get bent. This can short the chip in the data lines just above the charger or open the filter just above that resulting in no access to RCM. I've also had it damage the tegra. System still works as normal but the data lines won't communicate with tegra resulting in no access to RCM

is there a photo showing where those pins go on the SoC?

 

[Ttm3]

i'll try reflowing as i only have a hot air station at the moment.




is there a photo showing where those pins go on the SoC?

I don't have one. I always assumed it damaged that circuit going through the processor & was not a reflow candidate.