Hi I have been replacing a Touch Bar connector as the laptop had suffered liquid damage and some on the contacts have burned (A1990 MacBook Pro). Some on the connection points have disappeared (burned away) all that is left is a tiny dot to solder too. Also have another similar damaged via on the PP5V_3GS rail which is linked to a lot of rails on this board. Again there is a tiny dot which I think is the via to attach too, can these be repaired and built back up to a pad? Is it wise to dig down carefully in the layers to get a good solder connection and build back up with solder paste? just wondering if anyone has any advice or experience of doing this, thanks
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Re: Burned via repair
I've used a trace repair kit like this https://www.aliexpress.com/item/1005004910688781.html and soldered a pad on top of whatever is left. -
Re: Burned via repair
Yes I have a set of those but the problem is the remains of the via are below the level of the board, kind of in a hole, not sure by scraping around the edges I will damage other traces and layers. It seems almost impossible to get a solder blob to connect! Ive just ordered a t30 tip for my Hakko which I am hoping will workComment
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Re: A1990 MacBook Pro Burned via repair
Yes, it will be below the surface, the tip pad has gone.
I didn't scrape, I just tinned what was left and stuck the pad on top.
I do have a stereo microscope so stuff like this is fairly easy.Comment
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Re: A1990 MacBook Pro Burned via repair
Ok thanks for your advice I will try again when new tip arrivesComment
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Re: A1990 MacBook Pro Burned via repair
If you still have the via, you solder jumper wire to it (like 0.02mm) then apply a dab of UV mask on the join. Then spiral the jumper on top and tin it to form a pad of sorts. You could apply UV mask on the spiral and scrape the top of it then tin it if you aren't confident.Comment
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Re: A1990 MacBook Pro Burned via repair
Thanks for the advice I will try the wire spiral method with solder mask. Any recommendations for decent solder mask? the stuff I have does harden but needs a good 5 minutes with the uv light even with a thin coating.Comment
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mb code:820-01827-A;
sn:C02Z349ALVDR;
i9 32GB Ram 1TB
Hi, I found short on one of 6 black nand (total 1TB).
i removed all 6 nand ( voltages all ok) and now i want to program with JC P15 but for A1990 2019 there is only 512GB configuration.
I try A2141 1TB configurazion with TSB4228 but the position on pcb is different ( U9300 and U9400 is no stuff on A1990 but present on A2141 and U8800 and U8900 is no stuff on A2141 but present on A1990 )
macbook with A2141 configuration run on recovery but don't complete it.
anyone can help me?05-26-2025, 09:27 AM -
Hello,
I am currently working on a Macbook Pro A1990 (motherboard 820-01041) which is not charging.
The Macbook consumes 5V and 0.019A at USB-C. There seems to be a partial short-circuit on the PPBUS_G3H rail as I have 0V on this rail.
I've physically separated (by removing F7000 and F7001) PPBUS_G3H and the ISL9240 charging chip to see which side the short is coming from. Removing these fuses gives me 12.6V at the output of the ISL chip (PPVBAT_G3H_CHGR_REG).
However, I can't work out exactly why I don't have the PPBUS_G3H rail.
Here are the values... -
I have a a1990 2018 15 inch MacBook Pro that will not power on.
I have replaced the pch bga chip because it was heating up under my thermal camera.
I have replaced the battery, and replaced the small ic between the gpu and cpu as it had a direct short to ground.
the MacBook now pulls 20v 2.4amps the trackpad clicks but it does not ever attempt to power on not even fan spin. After PCH replacement I was able to get it in dfu mode 1 time and restore bridge OS, but now the MacBook will no longer go into DFU mode.
I have also noticed L7030 gets extremely hot yet... -
Hey everyone,
I bought a MacBook A1990 with no screen. I bought it knowing the motherboard was defective but wasn't sure what the problem was until I received it. It actually turns on but as you see from the attachment, it has vertical stripes, on an external screen!!
The board is neat. Not opened before for sure. Just a little dust, nothing more.
Recovery using wifi can be opened, as can also be seen in the photo but it doesn't go all the way through after connecting it to a wifi. It downloads the initial Recovery files but never completes the rest of the... -
Hi, I have a problem with MACBOOK A1990 - The laptop starts with no image when the battery is connected, but without the battery it starts with an image - however, when using only the power supply, when logging into the system it turns off and resets again.
Battery replaced with another unit → same problem.
ISL9239 replaced → no change.
SMBUS_BATT_SCL / SDA measure ~20-50kΩ to GND with battery disconnected (normal).
Any ideas or advice would be a huge help!
Thanks in advance for your time.
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