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The fourth-generation Surface Pro tablet, released October 26th, 2015.

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After replacing sr pro 4 LCD,won't turn on battery mode unless plug it

After replacing the surface pro 4 LCD, it won't turn on the battery mode unless i plug it with the charger

After i had replaced a surface pro 4 LCD, won't turn on battery mode unless plug it.

Before taking off the broken screen the pro was working good just the screen was broken, so i turned it off then started working on it. after taking off the old broken screen. i tried to connect the new LCD on to test it but no response at all.

it does only work when i plug it in the charger and it does show me that the battery is 100% full on the screen?

also i did put a piece of paper between the connects part for the battery and the motherboard. it does show me an X on the battery icon on the screen when i turn it on

but i couldn't resolve the problem for 1 week now and i have been searching online but no one has had these issues before.

so how can ifixit ??

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If you unplug it when its on, does it die instantly?

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yes it dies like there is no battery ,,

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Same issue. Putting piece of paper between battery and motherboard reports no battery, to one side reports battery capacity as -1 but centered all correct info is displayed in the battery report but as soon as I unplug it, it just cuts out.

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has anyone solved this issue? i just replaced the battery and screen in the SP4 and the system boots up fine (even shows charging) but as soon as i pull the plug... its dead

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Yes I fixed mine. There are two little diodes on the motherboard under a silver plate (pictured in the most helpful answer).

I measured the resistance of both (with power disconnected) and one resistor showed 1 (which is the default reading) and the other read 230. I guessed that the faulty one must be the one with no resistance (reading 1) so replaced this and it resolved the problem.

It was rather fiddly to solder though but just used the soldering iron and some old solder from the garage so it may have been easier with something more specialised and finer.

As the replaced diode did not lie as flat I stuck a piece of electric tape on the underside of the silver metal cover to ensure it would not make contact.

After re-assembly, the device switched to battery again when unplugged.

Removing the screen, I damaged the WiFi/Bluetooth antenna (as it is glued to the back of it) but used tin foil to replace this and it worked at least as well as it did before and actually think the signal was slightly stronger

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We got a couple of these SP4's in from repair shops where battery stopped working after screen replacement. Most of them had a blown diode in the charger circuit, another one a blown FET. We guessed that the display wasn't switched off when taking it off, causing the LCD backlight power buck converter to spike, but according the repairshops who sent them this was not the case. So why this is happening, we got no clue at all.

Done an SP3 as well, same sympthoms. Only way to solve it on the SP3 was to replace the battery AND the charge controller chip.

Kinda rubbish, these SP's if you ask me.

Theo | Logicboard Repair

Update (01/23/2018)

If you encounter this problem, check the two Skottky Diodes in the picture. (40 Volts / 5A). Voltage over the diode from anode to kathode should be around 0,2V. If higher, then replace. (Needless to say you have to measure this in Diode mode, with a disconnected battery). Also we encountered problems where 1 of the FET's on the control board of the battery itself went into a latch-up state. This can be solved by shorting drain and source shortly. (Be carefull!) Hope this helps someone.

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Theo | Logicboard Repair

Update (10/04/2019)

We think we found out the cause of this strange fault. The capacitor in the blue circle is very big, the slightest pressure on the metal shield cover will shortcut the capacitor and cause this failure. Make sure that you do not put any pressure on this shield, remove it and place some capton tape on the inside of the shield to make sure the capacitor cannot be shorted anymore. Again, hope this helps someone!

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Theo | Logicboard Repair

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would like to get in touch with E Surgeon - my email address is: jlsprinkle@zoominternet.net

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as u describe i check with that two diodes......they look perfect,,,,any other part to check with or any solution u found....i am having the same issue with same symtom

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Link to buy these diodes?

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@AFAQ ALI, check the FETS on the battery, see above comment.Diodes may look perfect, but do they measure correctly?

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Sounds like a problem with the power manager. Do a hard reset by holding the volume up and power at same time until the machine turns off. Wait a few seconds and turn it on. Hopefully, it will work normal after this.

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while its plugged in ?

because thats the only way to turn it on

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Yes, plugged in. You want to do a hard reset while the machine is on.

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yes i tried that so many time but nothing happen ..

even its shut down if i unplug it

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Also had the same issue.

Replaced LCD and doesnt turn on.

Plugged in and turns on normally. Works perfectly however as soon as remove charger, turns off.

For sure, this is not battery issue, as already tried replacing the battery.

Met last week with another tech, and he had couple of surface with exactly same issue.

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I have the same problem with my Surface Pro 4. It only works when it is plugged in. The battery is fully charged. I ran check on the battery and it is in good health. Used very little heat on it when I replaced the screen. Someone needs to solve this issue. Nothing about this problem being solved on the net, that I can fined. It is a shame that this has not been solved. There are a lot of expense pro 4's out there with the same problem. I hope that there is a definitive answer soon.

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Ifixit should be extremely pleased to have technician like Theo | Logicboard Repair on this forum. He went beyond what I expected and because of my age and hands that can no longer do fine work, he offered to repair my SP4 if I could ship it to him. He is extremely knowledgeable and the only one who knew how to solve this problem which seems to be a widespread problem occurring with the SP4's. I am very happy to worked with Theo (E-Surgeon).

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I have received a new battery that does not show voltage on the terminal. I installed the battery but it does not work on battery. I suspect the battery protection circuit .Does the battery get turned on only after it receives command on SMBUS? My old battery even though discharged shows some voltage on terminal. Can someone throw some light on this?

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this is my device

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check diodes 1: is 1

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check diodes 2: is 192

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Hello,

I have the same board and it will not run on battery. When I check the same diodes I get the following, No Battery and no power #1 is at 201 and #2 is at 202. When I apply the power #1 becomes at 193 and #2 at Minus 422.

I also looked everywhere for a schematic but no luck.

I feel it is a possible ground issue with the power adapter, i will give you more details next week when i confirm my thought.

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Also possible that one of the FET's on the battery board itself is in a latch-up state. Carefully short source and drain with a plier shortly and reattach the battery. This happened here as well and this procedure brought the FET's back into a normal state.

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I would like to try this. Can you possibly provide an image or further explanation of "drain with a plier".

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Thank you Phạm Như Đông. Appreciate the good work.

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@E-Surgeon Hello. Please can you elaborate on how I drain power with pliers as realise this may be dangerous if I do it wrong and short circuit the wrong bit. Would really help thanks.

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The battery needs to be replaced, if you put the device in a heater to remove the screen then the heat likely damaged the battery

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I wish someone would solve this problem, which I also have.

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Hey guys my SP4 started having this symptom 3 days ago, I didn't even crack/replace the screen. It just happened on its own. It only runs on charger now and battery is fully charged. I contacted support but they were no help, they offered to replace the device for $450 as it's out of warranty.. it's like we have $450 laying around every time this $@$*!& device breaks.. I already replaced it for phantom touches and now this.

I do iPhone/iPad maintenance and I'm good at micro-soldering too, so I'll probably pop this open soon as I have time for it. So are there any schematics/board views out there for it? I'll order a new battery pack too in case it was a bad battery.

Also I'd love a site where I can find a genuine battery pack. Thanks!

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there are no schematics and no boards for this device publicly accessible. it's %#*@ a shame that there isn't a definitive fix for these devices.

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No schematics / boardviews available, we had to figure it out on our own. Dunno about the battery packs.

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I have changed out screens on iPads, Samsung tablets, and changed out batteries on several small electronics. I usually do it right, and save money. But this time I a having a problem. I replaced a battery and a screen on a Microsoft Surface Pro 4 after the screen shattered. I can't get it to come back on. Do you do repairs or know someone who can check it out? This is my son's computer and I am trying to get him back up and going for his last semester in college. I have not sealed up the new screen yet.

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Also we encountered problems where 1 of the FET's on the control board of the battery itself went into a latch-up state. This can be solved by shorting drain and source shortly. (Be carefull!) Hope this helps someone.

Can anyone elaborate or clearly explain what this means?

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Can't make it clearer then this: https://en.wikipedia.org/wiki/Latch-up

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"This can be solved by shorting drain and source shortly." - Can you please explain how this is done with the SP4 battery?

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salut les amis, donc très simple !! quand on change d'écran en effet une diode slap et ce n'est pas pour ça ... MAIS microsoft a mis sur la carte mère une diode de remplacement qui se trouve au dessus du connecteur LCD. Vous remplacez la diode défectueuse par celle-ci et la surface fonctionne sur batterie.

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Normann repare ?

C’est automatique ? Qui dit écran casse dit diode cramée ? Bizarre..

Autre chose, Jvais commande mon écran mais c est pas le bon.

Le mien a 32broches. C est visiblement la version 2.0 fabricant LG.

Et non pas la 25broches, écran Samsung.

Où puis je acheté un produit sur et pas trop cher ?

Merci

Bruno

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Actually I’ve got Microsoft Surface Pro 4 too using for nearly 5 years and experiencing shaky screen after it’s heated or becomes hot. The unit is really excellent with my work being IT System Administrator and other stuff like editing videos and photos. I want to save the laptop. So it’s well known issue now. I searched and tried all the possibilities to solve the issue but failed. The high recommendation is to replace the LCD display. I’m planning to change also the battery. Your experience after changing either LCD display or battery is discouraging cause I’m now hesitant to do it. I might experience the same “totally dead laptop”which is possible after spending. Here in the Philippines most of the repair shop won’t accept to repair and telling better to buy new than repairing. My question is “Is it worth repairing?”

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@ Mike th0ms0n

That's a bit of a blanket statement which I wouldn't agree with. As Mike suggests, I'd say if a person placed the entire tablet into an oven and heated it, then it's possible they may end up damaging the battery.

In cases of using a screen separator (heated surface with vacuum suction) the battery shouldn't sustain any damage. Also in [the more common] cases of utilizing a heat gun to warm up the screen bezel and edges in order to remove the screen, you will not damage the battery.

Most importantly, on the topics of avoiding damaging the screen (and yes, I’ve even made this painfully costly mistake before), the trick I’ve come up with is having made a custom self adhesive label in which the width is equal to the width of the two flat ribbon cables.

The visual label not only reminds me but accurately depicts the precise location, so as to handle it with kid gloves around that area!

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