Hardware Switch won't turn on

[Agilato]

Do you mean that I might have killed other chips by removing the M92T36?

No, the way MT chip was installed before and you were turning console on, might fry something else on the board. Make sure that MT pins or any other elements around aren’t bridged to each other and check caps around BQ and P13USB chips.

 

[ds34]

The solder that bridged the resistors somehow vanished... But I noticed this:

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What happens when I bridge the missing resistor?

 

[ds34]

Can you tell me if I broke the PCB?

 

[Pintglass]

Can you tell me if I broke the PCB?

Take an image of all the pads of where your M92T36 ic sits and post it.

 

[ds34]

I took pictures of all pads that look suspicious

 

[Pintglass]

Just take 1 image of the whole lot together

 

[ds34]

Is this good?

 

[Pintglass]

You still have a solder bridge between pins 36 and 37
Your missing 2 LDO capacitors from above pins 37/38
And your missing a pulldown resistor on pin 30

 

[Agilato]

I took pictures of all pads that look suspicious

Clean the board, make sure there is no bridged pads, overall it's looks good.
I personally don't see any damaged traces, in some places you have lost mask but it's very minor.
If you skeptical about traces just use you tester in continuity mode.

 

[ds34]

The replacement M92T36 chip arrived today but I will wait for the capacitors to arrive so I can "install" them onto the motherboard first.
Also, I can't clean the motherboard from the flux with 99,9 isopropyl alcohol, it just stays sticky.

 

[Pintglass]

The replacement M92T36 chip arrived today but I will wait for the capacitors to arrive so I can "install" them onto the motherboard first.
Also, I can't clean the motherboard from the flux with 99,9 isopropyl alcohol, it just stays sticky.

Try warming the flux up first then clean it of

 

[Agilato]

Sounds like very very bad quality flux or very badly burned one.

So before mounting the chip:
- clean the board very well.
- Make sure there is no bridged pads.
- Test other main chips BQ near battery and P13USB on other side for shorts on capacitors
- re-apply solder to the pads, this video breathily shows how ur pads should look like and how to mount QFN Chip
- mount chip and make sure all pins are looking clean without bridges.
- mount rest of the components (do it last because if you will need to clean excess solder it will be easier without stuff around)
- clean the board

TEST SHORTS BEFORE TURNING CONSOLE ON!
DO NOT TURN IF STUFF IS SHORTED!
TEST WITH YOUR MULTIMETER!

 

[ds34]

Can I use this resistor?
https://de.farnell.com/multicomp/mcre000188/dickschichtwiderstand-100k-1-0/dp/1711668

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Sounds like very very bad quality flux or very badly burned one.

So before mounting the chip:
- clean the board very well.
- Make sure there is no bridged pads.
- Test other main chips BQ near battery and P13USB on other side for shorts on capacitors
- re-apply solder to the pads, this video breathily shows how ur pads should look like and how to mount QFN Chip
- mount chip and make sure all pins are looking clean without bridges.
- mount rest of the components (do it last because if you will need to clean access solder they will not be on the place)
- clean the board

TEST SHORTS BEFORE TURNING CONSOLE ON!
DO NOT TURN IF STUFF IS SHORTED!
TEST WITH YOUR MULTIMETER!

So I should first install the chip and then the resistor and capacitors?

 

[Agilato]

So I should first install the chip and then the resistor and capacitors?

Amh....
- mount rest of the components (do it last because if you will need to clean excess solder it will be easier without stuff around)

 

[ds34]

What about the link to the resistor I posted? Can I use these?
I will install the chip first if I understood you correctly

 

[Agilato]

What about the link to the resistor I posted? Can I use these?
I will install the chip first if I understood you correctly

Looks correct for me, i use Capacitors + resistors book its 30$ on eBay covers every possible case scenario.

 

[ds34]

Can you send me a link to this book?

 

[Agilato]

Can you send me a link to this book?

I got it from China (aliexpress.com) but due to their New Year Month and Corona virus spread, i don't think you will get it from there in next month. Based on your flag my guess that US sellers will not work for you well, you have to find one form the Europe.

Here is seller i use: https://www.aliexpress.com/store/605870?spm=a2g0o.detail.100005.2.184e7a9eosJbIi

Follow this sizing guide.

 

[ds34]

Is the replacement chip supposed to look like this?
Do the solder pads look all right for the chip placement?
I'm scared to also screw this up

 

[Agilato]

Is the replacement chip supposed to look like this?
Do the solder pads look all right for the chip placement?
I'm scared to also screw this up

You still have that dark spot between pins 8 and 9, if it stuck just take something and gently scratch it off.
It can create a short and also situation where solder with not stick properly.
Same if you will over burn the flux it will crate interference.
Also tin pads on the board, make sure middle pin doesn't have to much solder, just little touch.