Hardware Switch won't turn on

ds34

ds34

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Hi there,
My switch won't turn on when I plug a charger into it.
When I put it in the dock with the original charger connected to it the dock blinked rapidly and I heared ticking noises.
When I plugged the switch directly into the charger I noticed plastic like smell coming from the switch.
After that the OEM charger didn´t work for 20 minutes.
I tried turning it on with a known working battery but it still won't turn on.
I noticed that the M92T36 Chip looks like someone messed with it. I will upload some pictures later.
The Switch is one of those patched ones (XKJ700005)
 
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ds34

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Picture 1

--------------------- MERGED ---------------------------

I can hear this sound when the battery is connect and I´m pressing the power button. When the battery is unplugged I can´t hear this sound.
 

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Agilato

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I see missing cap near M92T36.
You definitely will have to replace or reflow M92T36, doesn't looks aligned well, hard to tell by pictures.
Can we have more pictures of the board, places near BQ and P13USB?
 

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ds34

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Sure

--------------------- MERGED ---------------------------

There you go
 

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Agilato

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Based on those messed up screws you will have to take it out the board and show us other side.

Anyway starting point would be:
1) Place lost capacitor (i'll include nominal for a capacitor) those 2 caps critical for switch to work!
2) Fix alignment issue with M92T36, i wouldn't trust it and trow in garbage, but you never know.
3) BEFORE TURNING ON, Check short on M92T36.
4) Check BQ and P13USB on short.
....
 

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Agilato

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ds34 said:
how do I do step 4 and 3?
Click to expand...

Disconnect battery form a console.

Use multimeter in continuity mode.
Place black probe on ground of a console (something like charging port) and with red probe check sides of the capacitors around those chips, they shouldn't have grounds on both sides.

Check this guy, He has a lot of videos about switches.

 
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ds34

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That's the other side of the board
 

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Agilato

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ds34 said:
That's the other side of the board
Click to expand...
Looks good. So may be some one tried to fix M92T36 only.
You have to put back that lost capacitor and if luck on your side previous owner might already replaced an M92T36 and its still alive, just need an alignment.
 
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Called something like: SMD Capacitor Sample Book
They have it like kits with SMD resistors, fuses and capacitors.
You need 0402 size, Check eBay.
 
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Agilato said:
I would start with unnecessary stuff first M92T36 alignment and Cap, than check for shorts and first start.
Click to expand...
So I shouldn't begin with replacing the missing capacitor? (I'm sorry for asking that much questions)
 
Agilato

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ds34 said:
So I shouldn't begin with replacing the missing capacitor? (I'm sorry for asking that much questions)
Click to expand...

My bad, wrong word was used, necessary, always firstly fix stuff that doesn't look right, than move forward.
Previous owner might replace M92T36 it din't worked because he knocked-off really important cap and he sold it.
Fix might be way easier than you think and guess, so why you have to spend time for it...
 
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ds34

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Here are the pictures. Also I mixed up the M92T36 with the BQ chip.
I ordered the 100 replacement capacitors.
I think I will only need like 15 of these (I will probably loose 10, somehow brake 3 and mess up the soldering with one)
 

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