Nintendo Switch lite charging chip heats up and does not short circuit

[fab13]

Hello everyone


Small technical problem on a Nintendo Switch lite
Here's what I noticed: the USB port has been damaged internally, with a short circuit on the power supply line to the small fuse.

After replacing the USB connector, the short circuit went away and I can't see any other short circuit in the whole motherboard.

When I charge the console, it seems to be charging: I get 15 volts and an amperage of 0.450 A.

Then, after a while, the amperage increases to 1.1 A and the BQ24193 charging chip starts to heat up, as evidenced by the thermal camera.

So I replaced this chip and it didn't short-circuit, but it still heated up, and I replaced the chip for the 3rd time.

I also replaced a small diode on the line, and the same problem persists: the load chip heats up.

Any ideas?

Many thanks

[fab13]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

Up please =)

[elecsoluces]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

Hello,

BQ24193 is heating, it's normal behaviour. What is the temperature?
Charge current seems normal, are you sure it is not a display problem?
Check LCD and LCD connector.

[redbaron1007]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

The BQ24193 gets hot while the battery is charging. That's basically what happens when you force that much current through the chip that energy gets dissipated as heat. As long as it's not getting hot while the charge isn't connected everything is most likely working as intended.

Is there anything else wrong with the switch other than the bq chip heating up?

[fab13]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

Thanks for your feedback, a 1 Amp load probably means a short circuit, but I could be wrong.

Indeed, I've already tried with another LCD screen and a new daughterboard, unfortunately a waste of money =S

There's no sound coming out of the console, because if it's a display problem and the console starts up I should be able to hear the console sound, but that's not the case here.

No start-up and I changed the USB-C port again and no short circuit anywhere and now the console estimates 0.453 A which is much better but still black screen =(

[fab13]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

I'd say about 50 degrees was instantaneous heat when charging, regardless of the type of charger, be it the original 15-volt or a normal USB C charger.

[redbaron1007]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

If you haven't already try replacing the m92 ic. I've had tons that looked like everything was charging correctly, but not turning on. It's weird how that chip fails sometimes without any shorts or signs anything is wrong.

You could also potentially have an issue with the lcd connector where a pin is bent out of line or an issue with the display power regulator (MAX77620) on the underside of the board by the lcd connector.

I personally don't think there's anything with the bq IC from what you've described.

[fab13]

Re: Nintendo Switch lite charging chip heats up and does not short circuit

It's actually the 3rd M92T36 chip and the console started up after the Nintendo Switch logo and then nothing.

Test new battery we hear the sound but no image here is a new problem lol

Test with a new daughterboard and a new LCD panel from the daughterboard to the motherboard, still the same problem.

No shorts around the chips, so I decide to replace the M92T36 and it's still the same. I've got my 15 volts and a battery that charges.

I suspect that the LCD connector close to the charging connector, which receives 4.90 V, should not receive the power from the 15 V charger?
What's more, I've noticed that only one volume button works, the power button doesn't work and neither does the top volume button.

I'm ordering a new FPC connector and we'll see.