Switch V2 Short on Max77812 + Left from LCD Connector + Switch works with Battery but not charging

Harak

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Hello,

I have a weird problem. I have a Switch V2 with a bad port. Replaced it. Looks good. Test it with USB Tester, Nothing No Amp no Voltage. Doesn't even turn on.
Looked at the USB Fuse. Fuse ok. But no Voltage arrives. Also short on MAX77812 Area and also Left from the LCD Connector. See Image.
The weird thing is. With a Battery the switch works normal. I removed MAX77812 still short in the MAX77812 area and left from connector.
Thanks for your help.
 

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thesjaakspoiler

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Also capacitors can short out.
If you have a thermal camera, look for a capacitor heating up.
Else you'll need to check all the individual voltages.
The MAX77620 was the original regulator but afaik Nintendo put a MAX77812 in the V2 model.
https://www.retrosix.wiki/dead-short-checks-nintendo-switch
https://www.retrosix.wiki/max77620-cpu-regulator

You can also try to measure for a short on each cap with a multimeter, but it can be another capacitor.
So even after removing a potential bad cap, the short might still be somewhere else.
 

Harak

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Allright. I dived deeper into the issue using also the new leaked xzz pcb files. I also ordered an thermal camera which will be delivered. but i think i found the problem.
According to the xzz pcb filed one pad from the inductor is ground. therefore there is a continuity to ground. so normally no short. i have only short on that inductor. no where else.

The short at max77812 still exists although no max ship is on the board. the short are exactly at the position ass seen in the xzz pcb files shown. there going to the soc. so is my soc bad? as a reminder. it works without any problems with a full battery. but charging not possible. when i plug in the usb connector 0v arrives the board. and yes my chager is working on another switch oled perfectly.

also i marked the shorts at the max77620 ic which are also going to the soc. as i said even without the max77620 i have those shorts. removing the inductor shows that the short is on the soc side.

as a conclusion. is it possible that the soc bad but only for the charging circuit, but the rest works perfectly fine?
 

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slimeinacloak

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Have you tried a new M92 IC? If the console booting normally with the battery but not charging I'd think the max chips are ok but either the M92 or BQ one
Also could diode test the pads around on the M92 and compare with the XZZ files
 

Harak

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Have you tried a new M92 IC? If the console booting normally with the battery but not charging I'd think the max chips are ok but either the M92 or BQ one
Also could diode test the pads around on the M92 and compare with the XZZ files
Unfortunately I can't see the diode values opening the data. and btw thanks for the files. I hope you will update boardviewer soon to use it with that program. i don't like flexbv much.
I will change the m92 but i have no short there. so i thought there is no problem there. but i will do it defintely and update it here.
i did also the vsys injection test according retro six. everything was fine. bq circuit should be good normally
Post automatically merged:

Unfortunately I can't see the diode values opening the data. and btw thanks for the files. I hope you will update boardviewer soon to use it with that program. i don't like flexbv much.
I will change the m92 but i have no short there. so i thought there is no problem there. but i will do it defintely and update it here.
i did also the vsys injection test according retro six. everything was fine. bq circuit should be good normally
swapped m92. no luck. i will replace the usb port again tomorrow. is it normal that there is no voltage at the usb port pin and fuse?
 
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slimeinacloak

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https://gbatemp.net/threads/xzzs-switch-boardviews-cracked.663854/post-10581574
^ Sorry should have sent link before, for the diode readings (under view options turn on obdata coverage too)

If the usb controller doesnt negotiate with the charger 0v is normal (wonder what a usb-a to c cable would show as that provides constant 5v regardless because it doesnt negotiate like usb-c does)

Id try probing the pins around the P13 chip if the M92 didnt change anything
 

Harak

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https://gbatemp.net/threads/xzzs-switch-boardviews-cracked.663854/post-10581574
^ Sorry should have sent link before, for the diode readings (under view options turn on obdata coverage too)

If the usb controller doesnt negotiate with the charger 0v is normal (wonder what a usb-a to c cable would show as that provides constant 5v regardless because it doesnt negotiate like usb-c does)

Id try probing the pins around the P13 chip if the M92 didnt change anything
already checked P13 chip. also no short. filters are all good.
thanks for the link. i will activate obdata and try it out
Post automatically merged:

Alright. I changed the port and i still have a short but now it charges. So everything is working perfectly. Thank you guys for your help. Thread can be closed.
 
Last edited by Harak,

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