Dim green light on magsafe, doesn't charge but boots fine if connected

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MacBook Pro 15" Unibody Early 2011

Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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vizi0n @vizi0n

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发帖于: 2018年10月4日

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Dim green light on magsafe, doesn't charge but boots fine if connected

Hi!

I’ve spent the last few days browsing tons of posts about dim green light magsafe connectors but still haven’t found a similar case.

I’ve bought a MBP that had dried up thermal paste on the CPU and GPU which caused overheating. The charger was working fine, bright orange or green light.

I took it apart, installed new paste and after putting everything back together the charger will not charge the computer and will only have a very dim green light on the connector.

When I connect the magsafe power supply the light is very dim, even when the board is out of the case with nothing else connected. I do not see any corrosion on the board, or any damaged components.

An SMC reset does nothing

A PRAM reset does its thing but doesn’t solve the issue

Using Coconut, I can read the battery info (serial, temperature, cycles, etc), it sees that it is connected to AC and it also says that battery is not charging. It currently runs at 1.6% (74mah)

I tried a different power supply which works with another Macbook but I have the same issue.

I cannot find schematics of the one-wire circuit on this computer so I cannot verify the voltage (I dont know where the chips are).

Do you have any advice?

Thank you!

MagSafe connected

that’s all I currently have on my cellphone. Like I said in my original post, the computer can read the battery info.

I have tested with a known good adapter already and it shows the same behavior. I dont have a spare dc in board to test but I have already ordered one yesterday

here is a screenshot of Coconut with magsafe disconnected

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Dan @danj 声誉积分: 479.9千 Self employed contract worker 35 329 971 · Answer 1 · 2018-10-05T06:26:46-07:00

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Dan @danj

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发帖于: 2018年10月5日

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Not good ;-{

You appear to have damaged your logic board. There are a few different possibilities.

Didn’t work on a static free work surface and/or did not use proper ESD precautions.
You over did the thermal paste and it’s shorting out the other logic on the chips base (some paste is conductive or capacitive).
You snagged one of the small SMT components dislodging it
You damaged one of the connections.

Any one or more of these could explain your issue. I would go back and clean off the thermal paste if you see any had gotten off the silicon chip its self

Inspect the board for any damage as well as the cable connectors (both the board & cable sides).

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All connections are good (everything is functional: fans, keyboard, backlight, speakers, screen, mic, dvd, hdd, power button).

I am using a very low electrical conductivity paste and I made sure to apply only the minimal needed amount of thermal paste so that it doesnt overflow on the chips.

The computer runs just fine, but the performance is throttled because there's no battery power.

Do you by any chance have the plan of the board so I can find out if there is voltage on the 1 wire circuit?

由 vizi0n 完成的 2018年10月5日

OK lets dig a bit deeper on the battery logic. Install this app CoconutBattery post a snapshot of the main window so we can see whats happening. Do one with the MagSafe connected and a second if you can with the MagSafe pulled. Then place them here for us to see 在已经存在的问题里加入图片

As for schematics there out in the wild of the big i-Net. I don't think you need to go that far yet. Lets first see if the basics get you going. You might want to review this Apple T/N Apple Portables: Troubleshooting MagSafe adapters and make a good inspection of the MagSafe connectors for any dirt, burning or melting. You may only need a new charger or DC-In board.

由 Dan 完成的 2018年10月5日

I agree with Dan, first troubleshooting step would be to test the logic board with known working magsafe adapter and DC in board.

由 lemerise 完成的 2018年10月5日

Well, I tried another magsafe connector and power block but the same issue remains. The dim light. And now the computer wont even turn on because the battery is too low :(

由 vizi0n 完成的 2018年10月9日

Sorry guy as I suspected you damaged your logic board. The SMC logic on the back side of the logic board is damaged. At this point I think you'll need to send your system out to have the logic board repaired or you can just replace it.

由 Dan 完成的 2018年10月11日

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