Switch OLED. The fan is not working and joycons are not charging

heinrich_frei

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doom95

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Do the joycons function when you disable bluetooth(/airplane mode)?

Soldering looks neither great nor terrible, but this is really asking for trouble:
Untitled.jpg

The thermal paste of running everywhere indicates either very low viscosity or too much of it applied. Should probably clean that up.
 
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doom95

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The fan and joycons charge of the same 5V coming from a boost ic. See if there's a short in either the rails or fan by disconnecting 2 out of 3 and checking if the remaining one works. If not, either the boost ic or some protection diode may be bad.
By the way, how do you test that the fan doesn't work? Can you make it spin on demand normally?
 

The Real Jdbye

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Yes. Joycons work without Bluetooth in airplane mode

Ok. I'll try to fix the listed problems and posted about the result
Airplane mode doesn't turn off Bluetooth I think.
It's possible the issue is as simple as the JoyCon rail ribbon cables not being plugged in all the way or being damaged but you shouldn't even have to remove or unplug the rails to install a chip.
 

doom95

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It's very likely the 5V supply is missing. There is one supply shared by the joycon rails and the fan.
 

heinrich_frei

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There is one supply shared by the joycon rails and the fan.
The problem could not be solved. Do you mean this ic? If yes, then I can't find it on Switch OLED
P. S. I measured the voltage of the fan connector, it is 0v
 

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doom95

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What's the resistance over the 5v pin of the fan and GND? Can you trace the 5v point to any of the ic's in continuity mode, and check if any nearby capacitors are shorted around this chip?
 

heinrich_frei

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Sorry I been gone so long. I measured in continuity mode and got to this chip. There is no voltage at this point, but I didn't find any shorted capacitors nearby.
P.S. I also noticed that the element in the second picture passes electricity in both directions. Is this how it should be?
 

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doom95

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Hi, I've done some tracing. As suspected there is indeed a ~5V supply that is used for charging the joycons and PWM on the fan. It should be really simple to fix.

See attached diagram. The square black IC on the left of the SoC is a boost regulator that pumps up the ~3.7V from the battery to 5.3V using a MAX8969EWL53+.

Please check whether the following (with battery/USB detached):
- resistance to GND between the 5.3V point near the MAX8969, should be ~3k Ohms
- continuity between 3 marked 5.3V points (capacitor near SoC, pin on fan connector, capacitor near right joycon switch), should be ~0 Ohms

If that's good, then check, with battery attached. Wait for the switch to be fully booted, else the regulator is not enabled:
- voltage on the 3.7V point marked near the MAX8969, should be around 3.7V
- voltage on the 5.3V points, should be 5.3V obviously

If there is no short on the 5.3V rails to GND but also no power, then reflow this chip. If that does not help, we must replace it.
 

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heinrich_frei

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Thank you for your hard work.
- resistance to GND between the 5.3V point near the MAX8969, should be ~3k Ohms
Good.
- continuity between 3 marked 5.3V points (capacitor near SoC, pin on fan connector, capacitor near right joycon
Good.
- voltage on the 3.7V point marked near the MAX8969, should be around 3.7V
Good.
- voltage on the 5.3V points, should be 5.3V obviously
0v at all three points. MAX8969 looks damaged. MAX8969EWL53+ T chip suitable for replacement?
 

doom95

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Yes, if you can find it. Try reflowing it first!

I checked from the OLED switch I disassembled. I have a spare of the IC. You may contact me if you need it.
 

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