Hacking Feedback I fucked up my brother's switch

chingchangchong5877

chingchangchong5877

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Hi

I wanted to install a mod chip on the v2 switch my brother was using. After disassembling, wiping off the thermal paste and turning on the switch, a blue screen appears.
Under the microscope, I can't see any damage caused by the cleaning.

Could you help me with this?
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randy_w

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A blue screen can be caused by a variety of things, including bga issue on soc, bad ram, bad emmc or even bad m92t chip.

I'd say start with the easiest one, unplug and reinstall the emmc module, it might got loose during the disassembly (although unlikely as it's glued to the metal shield underneath)

Also check traces near the cpu/ram shield, they might get damaged when you try to pry it off. Hope you didn't force it off as you'll bend the motherboard and might cause bga issues.

As for the heatsink it doesn't really matter, the soc barely gets hot when in bootloader/booting the system. I do it all the time after installing modchips, just plug in the battery/vol buttons and screen and do a test boot, see if it can train properly and boot to ofw
 
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chingchangchong5877

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randy_w said:
A blue screen can be caused by a variety of things, including bga issue on soc, bad ram, bad emmc or even bad m92t chip.

I'd say start with the easiest one, unplug and reinstall the emmc module, it might got loose during the disassembly (although unlikely as it's glued to the metal shield underneath)

Also check traces near the cpu/ram shield, they might get damaged when you try to pry it off. Hope you didn't force it off as you'll bend the motherboard and might cause bga issues.

As for the heatsink it doesn't really matter, the soc barely gets hot when in bootloader/booting the system. I do it all the time after installing modchips, just plug in the battery/vol buttons and screen and do a test boot, see if it can train properly and boot to ofw
Click to expand...
First, I need to buy an air gun. I'll try it, thank you so much
 
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chingchangchong5877 said:
First, I need to buy an air gun. I'll try it, thank you so much
Click to expand...
Learn the difference. An 'air gun' is a firearm, I think what you meant was a 'hot air station'.

You've probably overheated one or two things after you removed the heatsink or shorted out something. Leave everything to a professional if you cannot be confident fixing it up.
 
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chingchangchong5877

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I think it's broken. I'll take it to a professional. Thank you for reply!!
Post automatically merged:

SDA said:
Your brother's gonna be extremely angry when he'll see this.
Click to expand...
I decided to buy an OLED switch if it breaks😥
Post automatically merged:

bvang913 said:
Yes, something definitely off there. Also, why is there solder on some of the pads in that area?
Click to expand...
I think it got on while I was removing the thermal paste. I'll check.
Thanks for reply
 
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randy_w

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smhrambo said:
View attachment 472020
Is this normal?
Click to expand...
Good eyes, I didn't even notice that. There should be a capacitor on the left and a resistor on the right. Seems like you squished the capacitor/resistor and all 4 pads are shorted together. The switch might just work fine if you clean up those shorts between VIO and GND

Did some digging and seems like the capacitor on the left is the bypassing capacitor on VIO bus, 0.1uf according to datasheet. The resistor on the right is connected between GPI0 and VIO, so I assume it's a pullup resistor. Try a 2.2k one, that's the standard pullup resistor value for i2c bus.

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randy_w said:
Good eyes, I didn't even notice that. There should be a capacitor on the left and a resistor on the right. Seems like you squished the capacitor/resistor and all 4 pads are shorted together. The switch might just work fine if you clean up those shorts between VIO and GND

Did some digging and seems like the capacitor on the left is the bypassing capacitor on VIO bus, 0.1uf according to datasheet. The resistor on the right is connected between GPI0 and VIO, so I assume it's a pullup resistor. Try a 2.2k one, that's the standard pullup resistor value for i2c bus.

View attachment 472072

View attachment 472073

View attachment 472074
Click to expand...
Thank you so much!!!!
Post automatically merged:

randy_w said:
Good eyes, I didn't even notice that. There should be a capacitor on the left and a resistor on the right. Seems like you squished the capacitor/resistor and all 4 pads are shorted together. The switch might just work fine if you clean up those shorts between VIO and GND

Did some digging and seems like the capacitor on the left is the bypassing capacitor on VIO bus, 0.1uf according to datasheet. The resistor on the right is connected between GPI0 and VIO, so I assume it's a pullup resistor. Try a 2.2k one, that's the standard pullup resistor value for i2c bus.

View attachment 472072

View attachment 472073

View attachment 472074
Click to expand...
Sry, I don't know much about this, and I'm actually not good at English. Can you explain it a little more simply?
 
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randy_w

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chingchangchong5877 said:
Sry, I don't know much about this, and I'm actually not good at English. Can you explain it a little more simply?
Click to expand...
So this is what that area should look like:
1732084887239.png

Brown component on the left is a capacitor, black component on the right is a resistor.
(this image is from an oled motherboard but they are the same)

Looks like those two components got squished and solder pads are shorted together. First thing you need to do is cleaning it up. Apply some flux and wipe that area clean with an iron, make sure those pads are not shorted (except for top 2 pads, they are connected together), then clean it with some alcohol. You can try to power the switch on since those 2 components aren't critical (bypassing cap and pullup resistor), if you're luck your switch might power up just fine. You should replace them anyway, the capacitor is a 0.1uF ceramic capacitor, the resistor is actually 10kOhm, measured it on a dead motherboard.
 
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