Mi Horizon 14 Doesn't power on, here's what another tech missed...

[@pldaniels]

Oh I need more jobs like this coming in to the workshop that are *fixable*. Nice to see the good tools being put to use as well. USB-C meter doing well ( new version of software lets you increase the cut-off threshold so that it won't run off the page when you have low current/volts ). Also good to see the Chipmunk helping out.

[@harriscom9255]

I've been fixing my own and family laptops/desktop for longer than I care to mention " 1990's" but I've never seen a keyboard do that before. A very satisfying fix thanks for sharing.

[@LPgmxDan]

I have seen couple of videos that had this

[@harriscom9255]

@@LPgmxDan Yeah I'm sure it happens but it's not something I've ever come across myself.

[@LPgmxDan]

@@harriscom9255 water or any liquid would encounter the keyboard or touch pad first but yeah didn't see that IRL yet

[@man_eating_monkey]

It's liquid damage causing a short in the keyboard. Some laptops can exhibit some very funky behaviour with keyboard shorts, including POSTing, but not loading the OS. Keyboards with an integrated power button, like this one, are even more likely to cause issues like no POST.

[@Aneesh.Asokan]

It has happened to me umpteen times!😢

[@somewaresim]

Great bit of diagnostics. The Paul Daniels USB-C power meter is very useful, I must get one.

[@pldaniels]

I agree ;)

[@nightcorefusion3884]

I've seen lots of dead keyboards in my time repairing laptops. Even some that exhibited freaky behaviour (such as one that would eject the disc tray when you pressed certain keys) But I've never seen one prevent a post before.

[@Aneesh.Asokan]

I have seen that too many times! Keyboards are PHANTOMS I suspect even for death in my neighborhood!😂😁😀

[@coladict]

My much smaller country has multiple local retailers with websites where one can find laptop replacement parts, so I'm not sure how the UK doesn't, that you would be looking at ebay every time. I was able to find all the parts for a 10 year old Lenovo that needed a new keyboard and fan on one of those. Of course neither they nor anyone else sells screws (many of which were wrong or missing), and the only place I found those in quantities of less than 5000 per screw model was on Temu.

[@3Dukkan]

Good catch Graham, i couldn't expect that keyboard is changeable :D I was thinking about engraving machine when you spot the broken keyboard. Anyways educational video as always. Cheers.

[@nian60]

Isn't his name Graham?

[@3Dukkan]

@@nian60 My bad, you are right. Thank you.

[@Aneesh.Asokan]

The pain to change is the frustration!

[@sparkz1554]

The reason the keyboard was probably causing issues is because the power button is intergrated into it and was probably stuck in the pressed position with would be like holding the power button down after turning it on which would turn it off. it probably could have been fixed by removing the power key and cleaning between the membrain.

[@benqu88]

Good and likely true explanation.

[@man_eating_monkey]

It's _possible_ that if the power button was abused, the key hinge or cup could be damaged, but in my experience, if a key is stuck active, it's more likely than not corrosion in the membrane layer.

[@gentle285]

I had the same thought, but then again, that wouldn't stop the battery charger/charging.

[@michaelmeux4137]

Haven't done a lot with laptops lately but definitely will remember this. Thanks for the video brother

[@bzfarbodjz]

i think the power key on the old keyboard were stuck .. just a drop of IPA and a little taps would solve the problem, remember it powered on by itself and turned off after a few secs... just the power button being stuck !!!!

[@Nico_335i_DCT]

Great job Graham! Thanks for sharing and have a good one. Regards Nico.

[@shoffmann70]

Excellent tutorial on the keyboard replacement. Thanks!

[@tim0steele]

At least it's got a replaceable keyboard unlike many laptops these days. Good for Xiaomi. That seems to be a US model.

[@viniciusvbf22]

As someone else mentioned, I believe it was a defective power button on the keyboard. Maybe liquid damage? It was probably impossible (or very hard) to fix, but it could be confirmed with continuity mode. I've seen people fix these buttons by placing isopropyl under it. Still, not a fix that I'd do for a customer.

[@Danbotics]

Apologies if you’ve answered this question before but what microscope are you using? The output quality is really nice! I’ve been trying to find a good HDMI scope for my home lab.

[@Adamant_IT]

Most of my videos are with an Andonstar AD407. I'm currently trialing one of the new Tomlov scopes, which have newer optics and higher resolution. These are 'digital' scopes that don't give you any depth perception, but they're less bulk and hassle than a full binocular setup.

[@badvoiceallnoise]

for the beginners, please do not try to solder on rtc. i had one exploded on me and almost lost my eye.

[@Adamant_IT]

Yea this was a super 'do as I say not as I do' moment... I'll do crimes now and then when I need to, but 99% of the time I pay up the £2.50 for the CR2032 with the correct JST on it.

[@viniciusvbf22]

Same thing happened to me. Almost got blind by an exploding CR 2032. I was very scared. The doctor said I got very lucky. I'll never do that again. I bought a battery spot welder the following day. Pricey, but way cheaper than an eye.

[@Kubickz]

@@Adamant_IT Or at least a CR2032 socket

[@Sulphur_67]

@@Adamant_ITcould’ve chopped off the cable from the old rtc and spliced into the new rtc battery cable

[@man_eating_monkey]

Copper tape is $6 delivered for two 20m rolls on eBay. Perfect for low current applications like attaching connectors to CMOS batteries.

[@badonrani4059]

Thank you sir for this video

[@Kabutordday]

I had same problem with IIRC a Lenovo, no post, due to a faulty keyboard, in my case the power supply was taking too much current, it looked like a half-short-circuit, and it went when I disconnect the keybord, and then I it posted video. I replaced the keyboard, but before I dip all the broken one in ethilic acohol, to see if that fix any short in the keyboard, but no. I had to replace it. It was a good catch, bit lucky also

[@tengasingapore3022]

Hiya, may i ask how you got the multimeter readings on the obs stream? Is it a multimeter which has got a output to the pc?

[@sipansibabdreddknot5179]

ive experience this before after the pandemic, mostly acer keyboards shorts the super io and doesnt start the whole startup sequence and now ive experience it too on asus laptop kinda to do with sio chips design with keyboard nowdays.

[@markg3506]

Nice fix Graham!

[@farewellspk]

yet another good work

[@neophearvr2723]

With the power meter do you have a link for what you are using, is it universal for most laptops?

[@sergiomarroquinjr3587]

So did you replace the thermal compound or not?

[@j.lietka9406]

Mi, as in Xiaomi. Great fix! Thank you

[@neilshep50]

Just this morning I dismantled my Dell Inspiron 2in1 to change the palmrest and keyboard. A complete strip down and rebuild. Why? Because the down arrow key had become intermittent!

[@Adamant_IT]

God I miss the days when keyboard replacements were a 60-second job of 'remove one or two screws from bottom, unclip keyboard and lift out of palmrest'

[@als1035]

I've seen those CMOS batteries work down to 1.5v. 2.8 should be plenty to keep it working.

[@DumahBrazorf]

nope, it's on the very edge of the cliff, from then it just drop dead.

[@Adamant_IT]

It depends on the platform. It's powering a 3.3v circuit via a diode, and if the PCH interprets the voltage as FALSE then it reset the BIOS. So it's going to depend on where the VOLTAGE LOW threshold is for a given PCH. I'm not sure about the answer to that, but I've seen batts at less than 3.0v (which will be closer to 2.8 after the diode) causing BIOS resets or in the case of Dell, no power, so I err on the side of caution.

[@nhbountyhunter]

Pretty sure it's not the entire keyboard that was bad it's just a power button stuck. So when you plugged it in it would turn it on but the power button being pushed down and stuck down would turn it off.

[@edwardrogers-wright1604]

Please, a question. Do you buy spares etc from Amazon? I had many serious delivery problems with eBay and closed my account. Are there other sources you could list for me? Thanks so much ...

[@Simon_diy]

Could be an "always on" problem of the power button included in the keyboard

[@rolfsinkgraven]

All's well that ends well

[@SusanAmberBruce]

Thanks for the video.

[@sokoloft3]

Wait a second.. Why does that bottom look so familiar to the Acer Aspire 515-54 I have. Sus. Are they just rebranded Xiaomi laptops?

[@ronlevin2339]

I have a same problem with my friend Samsung A56 phone ( I think).What can be wrong there ?

[@FernandoPonteFilho]

Wow! Truly Replaceable keyboard! Something we can't find these days...

[@Oser.]

2:53 the corrosion is cus someone used poor quality flux

[@hillhermit]

Thank you so much for Helping...... Can you Please Share the Link to Buy Keyboard Please.Mi Horizon 14 Doesn't power on, here's what another tech missed... #409

[@BabuncinaJones]

If i see a guy that looks like this, I know I have found a reliable source of information about anything I.T. related.

[@Timpano_Francesco_Repairs]

Yes truly, even me need a little more job like this that you can fix and earn more with the rigth work... i buy the magsafe tester of CMIzapper and as soon as possible i'll buy even Chipmunk.... and especially the the keyb is removable by screw and not by plastic or aluminum rivet like Apple... bye Francesco Timpano from Florence Italy

[@Er-SHAMBHUKUMAR]

Very good 👍

[@alimahdavi9775]

Hello Nice video Type-c connect ?

[@Adamant_IT]

Yes, I use the PL Daniels Type-C meter, with a Type-C to DC-jack cable: pldaniels.com/shop/

[@Retroornew]

@@Adamant_IT so what power source goes into the PLD meter i have one so i have the mini usb to the PC for the software type c out to whatever, but what do you have gointo the type c input?

[@klorslug]

⁠@@Adamant_ITlove that Paul Daniels meter. JoeyDoesTech uses it as well.

[@Adamant_IT]

Any Type-C PD adaptor. I currently use a 120w Dell Type-C charger from an XPS, however I wouldn't recommend it - the Dell Type-C adaptors aren't strictly PD-compliant, and occasionally they give weird behaviour when negotiating power.

[@carlojoselitochua2954]

Done watching, thank you very much for the informative repair video. I have learned significantly more troubleshooting & repair lessons in this tutorial video and to your other repair videos as well compared to my ENTIRE 4 YEARS OF COLLEGE due to the rotten & outdated standards of education here in the Philippines. I hope you will soon have a mini-series for Schematic & Boardview-free Voltage/Power Rail Tracing[12V/18-20V Main Voltage Rail, 5V, 3.3V, CPU/GPU Core Voltage Rail, DRAM Voltage Rail, IGPU Voltage Rail, System Agent/Northbridge Voltage Rail, PCH Voltage Rail, BIOS Voltage Rail, Battery Power Rail], Proper method of testing/checking of potentially faulty MOSFETs & ICs/Controller Chips, CPU/GPU/PCH Reballing and BIOS Bin File Editing.

[@farewellspk]

Just sure the basic course in college , son . R , L , C . AC . DC . Power Supply . LED . BJT . Do for yourself some electric plug , careful AC power . Forget industry - sh it electronic . Game offline more . You will be happy in all things .

[@arunaasuraz6500]

I don't understand how unplug keyboard leads to no bootable device

[@sparkz1554]

He removed the SSD. that's why there was no bootable device.

[@arunaasuraz6500]

@@sparkz1554 makes sense, thanks

[@bzfarbodjz]

you could've fixed it without even openning it 😄😄

[@Golscamp33]

Nice

[@Electricworld-1]

❤🎉

[@Electricworld-1]

I how now ordered my p2 pro from China 😅.

[@j.lietka9406]

Mi, as in Xiaomi. Great fix! Thank you