Friend messed up my laptop motherboard while working on my bench

[Geeker007]

Hi All,

So my friend was visiting and he wanted to use my solder bench to solder on some WLED circuit board. My laptop was open on the side for RAM upgrade. I know my mistake.

So while soldering he had too much solder on the soldering iron tip and he just shook off the soldering iron on the table itself to remove extra solder on the soldering tip and it landed on the motherboard of laptop. He then out of fear tried to remove it using solder wick and did more damage by removing some components as well. So here I am with weird situation.

I have not tried putting power as of now to the motherboard, fearing it might burn something as components are missing.

I think the motherboard is shorted now. I know some basics from Youtube videos but not so much into motherboard repair. Can someone please guide me here. It looks like from the below image one pad is removed, two of them are shorted and I am not able to remove the solder on the two pads that look like shorted and are shorted too when check with multimeter. What are these components here that are missing?

Below the PD Controller (Not Sure if it is PD controller) some caps are also missing.

Can you guys help me with repair? Which components I should order to get them replaced.

[m1ch43lzm]

Start here: https://www.badcaps.net/forum/troubl...r-s-guidelines

Brand/model of laptop? Board model number? That info will be needed to find schematics/boardview if available

[Geeker007]

Sorry my bad. I forgot to mention the Laptop model. Its a Lenovo ThinkPad T14 Gen 3 Type 21BS. Can someone please help me out in finding the components from schematics.

[m1ch43lzm]

Schematics and board view here Posts #2 and #3
https://www.badcaps.net/forum/troubl...atic-boardview

Type 21BS is T14s gen 3
Check if it says NM-E091 on the silkscreen, near the onboard RAM

What's missing:
- C5401, C5402, C5403: 0.22uF 6.3v X5R 0201, on the data lines that go to the Thunderbolt IC
- C5503: 2.2uF 6.3v X5R 0402, it goes to a ball under the Thunderbolt IC, can't tell if there's a diagonal trace that goes to it under the black glue in the corner of the Thunderbolt IC/L5501
- C5506: 2.2uF 6.3v X5R 0402
- C5507: 10uF 6.3v X5R 0402, in parallel with C5506
- R2206 (next to L5501): 10 ohms 0201, this one is critical as it goes to the BIOS

[Geeker007]

Great, thanks. One more thing, just got to know he did try to start it by plugging in power and nothing happened, no power? Anything bad could have happened here? No power, because resister R2206 for BIOS is missing?

Also guide me to find the trace for the pad that is missing, that is C5503, right?

Also, how can I remove that short on C5506 and C5507, I tried my best but still not able to. I have ordered hot air solder station, may be that would help here?

I have a spare board, can I replace capacitors at-least from that board? How about resistor? Can I take that also somehow from the spare board?

Sorry I am new to repair, that is why so many questions, but I am trying to learn.

[m1ch43lzm]

Great, thanks. One more thing, just got to know he did try to start it by plugging in power and nothing happened, no power? Anything bad could have happened here? No power, because resister R2206 for BIOS is missing?

Also guide me to find the trace for the pad that is missing, that is C5503, right?

Hard to tell if there's no secondary damage
For C5503 I can barely see a bit of trace, I don't know if it's that one, I marked it with purple what I think it is, as I can't see a via on the ripped pad that goes to the other side of the board, and there's black glue around it that Lenovo likes to use on their buards
It isn't connected to the inductor L5501
You'll need a very fine wire, thinner than a hair for this

Also, how can I remove that short on C5506 and C5507, I tried my best but still not able to. I have ordered hot air solder station, may be that would help here?

Depends how you're measuring the short, and how many ohms
Is it from top to bottom or from left to right?
Those caps are connected in parallel, in the schematics

I have a spare board, can I replace capacitors at-least from that board? How about resistor? Can I take that also somehow from the spare board?

Sorry I am new to repair, that is why so many questions, but I am trying to learn.

Depends whether the spare board you have is the same model, or different
If it's a dead board from the same model, sure, otherwise you have to search the schematics for your donor board and look for the same values/size if available, sometimes you won't find the same values or sizes
For the resistor, better order several, you'll lose them easily as they're the size of a flea, also they're very difficult to solder with an iron,
Since you're in the USA you have digikey and mouser

It will depend on your skills and equipment, you also need a microscope, a good soldering station with temperature control, with various tip sizes, hot air station, fine tip tweezers

[m1ch43lzm]

Sorry, upload failed from my phone
Here it is