Charging but no boot - HOT 8316 IC

[cstout]

Hi everyone,

I'm working on a Switch Lite where the seller wasn't honest about the condition and it's turned into a mystery for me.

It seems to charge with 15.3V and 0.09A drawing, but nothing else happens. No other signs of life. I replaced a shorted M92 and backlight IC and I don't have much for shorts (no shorts around BQ chip either). There are only a handful of caps around the MAX chips that have shorts, so I'm not sure if one or both of those might need to be replaced as well.

The strangest part to me is that there's an 8316 IC that's getting extremely hot and there are no shorts that I can find anywhere near it.

Anyone have any ideas what I should check next?

 

[thesjaakspoiler]

There are only a handful of caps around the MAX chips that have shorts

Yeah, that would be a good idea as a bad max power IC can also take out the capacitors around it.

Does the 8316 get hot without the display?
That would tell you whether the LCD is causing it or it's on the board.
I replaced some LED strips on imacs that were worn out and causing a near short with a high amp usage.
You never know whether the customer bought this of eBay for a bargain sold 'untested ; for parts'.

Maybe measure for resistance instead of continuity.
Even resistance of a few dozen ohm, a lot of current can be drawn from the 8316.

 

[cstout]

Yeah, that would be a good idea as a bad max power IC can also take out the capacitors around it.

Does the 8316 get hot without the display?
That would tell you whether the LCD is causing it or it's on the board.
I replaced some LED strips on imacs that were worn out and causing a near short with a high amp usage.
You never know whether the customer bought this of eBay for a bargain sold 'untested ; for parts'.

Maybe measure for resistance instead of continuity.
Even resistance of a few dozen ohm, a lot of current can be drawn from the 8316.

Yeah, the 8316 gets scorching hot as long as the battery installed. My guess is that it’s trying to boot since the battery is in and then usb plugged in. It doesn’t get hot without the battery, but I imagine it’s probably not trying to boot.

Where in particular would you recommend I check for resistance? Around the max chips?