Honeywell LCD fail and repair

The LCD screen of my Honeywell CMS927 thermostat mostly stopped working.
See here how I fixed the display using a toaster.
(Also applies to the CM927 - the S indicates it was sold with the receiver. The 921 is the 1 day rather than 7 day version.)
The site for user manuals:
heatingcontrols.honeywellhome...
I have another video with the background music removed here: • Honeywell LCD fail and...
Inspiration from:
• Honeywell cm901 Thermo...

[@ngorongok]

Its really useful and charitable of people to post these instructional videos and I'm sure this one would be very good. The problem is that the daft music, which is much too loud, completely distracts from the video and I can hardly hear the instructions. Also the music annoyingly increases and decreases in volume when the activity is fast forwarding. Having said this the gent has a quiet voice and this probably compounds the problem. Its soooo... helpful to have access to these videos and thank goodness people post them - just maybe in future it would be better to have the volume matched to the violume of the instructions. Anyway - Thank you "My Grandads Shed" good video.

[@mygrandadsshed]

I've put up a version without background music at: kzbin.info/www/bejne/nIjJgWyZlLOBn68 My camera does not support an external microphone

[@colingibson1732]

I was all prepared to replace my Honeywell CM921 and was actually trawling the internet looking for them when I spotted your KZbin video. Got to say a big "THANK YOU"!! Followed it to the letter and now have a full screen again. Many thanks for a great video.

[@lucykenney8071]

Thank you Grandad's Shed, we had put up with extremely poor display for about three years and worked through your video - end result ...perfect display. Simple and clear instructions. Used a hairdryer on it's hottest setting instead of a toaster. Brilliant!!

[@BGSGBF]

Hats off, sir. Just baked the LCD of thermostat I've found after it's being in a barn for 10 years. The screen was dead grey, only some light in the corner. Three "toasting" circles (it was getting better with every time) and it's ready for use. Thank you!

[@danram1]

Tried this on my CM927 which had quite a bad case of failing display. Tried it a couple of times with a hairdryer and it ended up worse than it was originally. Decided I had nothing to lose so did it with a toaster for a couple of minutes and was amazed -- it's now perfect. So, the lesson I guess is, don't be afraid to give it a good toasting. Many thanks for the video.

[@mygrandadsshed]

Another saved from landfill :)

[@1983samwise]

I thought I was going to have to buy a replacement unit and this worked, just used a hairdryer instead of the toaster. Thank you so much for saving me £100!

[@Blkmixer]

My mom's Honeywell screen had gone and before buying new I said let's look on KZbin. Followed your video and now were doing a dance around the kitchen. You saved us 90 quid! Many many thanks. Whoop whoop! I owe you a pint 🍻

[@glyndavies]

I agree with ngorongok about the music and the audio quality - however, this video was super helpful to me in solving my problem with ghost characters on my CMS927 thermostat. I was planning to buy a new one - but the CMS927 is discontinued. Honeywell tell me it can't be repaired and recommend replacing with a Honeywell T4R thermostat (about £100) which then would need to be paired with with the installed receiver. This video (plus a bit of added ingenuity) has saved me all of that. My first attempt, using a toaster, failed but when I used a hair dryer and added a piece of shaved down ice lolly stick as square section packing (as at 7:04) it worked perfectly. I now have a fully functional thermostat with all digits and characters displaying correctly - and I've have had an enjoyable and rewarding afternoon. Many thanks!

[@stevenward3430]

Great video. I managed to follow it and in my own experience I needed to hold over toaster until discolouration - about 2 mins. On the first attempt I didn't hold over toaster for long enough. Great video explanation, despite audio comments, and saved me £120. Many thanks !

[@mygrandadsshed]

Fantastic!

[@thekirks7344]

One of my CM927s lost part of its display earlier this month. I watched this video and others and decided to tackle the repair once I was back from a short holiday. I took the batteries out and left the CM927 in a room which will have been quite warm in view of recent good weather. I am now home again. I replaced the batteries and was delighted to find that the display was back to normal. Of course, I have no idea how long it will be before there is another failure of the display, but my advice would be to not rush into dismantling a unit until you have given it a chance to auto-repair.

[@Mark-ue6pm]

Thanks! I used your video and now have perfect working screen on the Chronotherm CM927.

[@mygrandadsshed]

Glad it helped!

[@Allegratoys]

Sorry but you do have to turn the music off, it totally distracts from your message. Thanks for the video though

[@mygrandadsshed]

I have already, please see: kzbin.info/www/bejne/nIjJgWyZlLOBn68

[@davros76]

Worked a treat using clothes pegs and hairdryer for 2 minutes. Thanks for posting...very helpful and saved £££'s getting a new controller.

[@yarmouthwolf]

heat gun and one bulldog clip. concentrated on heating clip (held with pliers) until screen looked like I may have killed it. worked a treat. saved me £200. for how long I don't know but see no reason it shouldn't last a good while 🤞. 1/2 hour pottering in my own grandads shed well spent. many thanks.

[@hugueshenrion6642]

Thank you!!!! 200€ spared, worked like magic, same thing with a heatgun and wood pegs

[@catherinecrowley7559]

Such a great help - thank you so much! I did exactly what you said and the problem is now solved. Amazing!

[@davidlyndon1114]

Brilliant - thank you!! For me this worked first time. I initially thought I may have overdone it, but it was fine after allowing to cool for around 20 minutes. I used metal clothes pegs and a toaster. Definitely need something to hold the unit towards the end of the 2 minutes as it all got quite hot.

[@monikafrac74]

Thank you, it worked! It is very nice of you to take time and modify the videos.

[@stoundingresults]

Fixed a nice LCD radio signal clock with your clue of applying heat. I used a hair drier. Thanks for posting.

[@dayangolanski1250]

Nice video, thanks god you posted a new one without this music. If you can speak louder it would be nice too. But thanks for your video! Helped a lot!

[@booterbill7264]

Top video ,20 mins and carefully following the instructions and hey presto working like new,thanks.

[@dighani107]

Thanks a bunch this really helped me, couldn't blive it it took me minutes to fix my fisher paykel fridge freezer display that totally stopped working, just took it out put it on top of the toaster not expecting it to work at all but to my amazement it just came back to life as it was a new unit, it would have cost me a lot to replace Thank you so much for the video

[@mygrandadsshed]

Nice to know that with this video you were able to apply it to a different product.

[@philippewillox4274]

Un grand merci pour votre vidéo, l’écran de mon CM907 fonctionne à nouveau. Thanks a lot

[@dirkdaems841]

Great video,. I tried first another video which state to warm/heat the LCD for about 20s above a toaster. Repeated this several times without any improvements. Since the lcd didn't work i tried to ready heat for 2 to 3 min's also to the point the lcd slightly colored darker. And after the second long heat the display did work again !! Many Thanks .

[@M1LKMAN2]

Your mileage may vary, but in my experience this procedure absolutely works. Though you might have to repeat this. In my case, the first time I had to do this was about two years ago, and the second time last week. Important is to let it soak up the heat for at least 1 minute. It’s the combination of heat (not too much, to prevent melting everything) and time (so the adhesive warms consistently). I do expect that ultimately the LCD will fail at one point, but there’s been no reason to discard the unit yet.

[@dirkdaems841]

@@M1LKMAN2 Indeed my solution did only work for one week...since i cannot reheat the circuitboard every week i bought a new thermostat. I hope that this solution works longer for other users.

[@jonathanharris9727]

Brilliant, thanks! Worth persevering I'd say, worked for me on the 4th attempt.

[@d7a7s7]

just saw the 'I have another video with the background music removed here: ' link - that is most appreciated .

[@mygrandadsshed]

I think the spam algorithm may have hidden your link to it: kzbin.info/www/bejne/nIjJgWyZlLOBn68

[@nitrousman8882]

it looks like you've reactivated the conductive adhesive between the flex circuit board and the screen. Excellent work!

[@mygrandadsshed]

Yes I believe so, as it was not hot enough to reflow the solder.

[@crazycaps]

Thanks for the steps and toasting instructions! mine works great now!

[@mygrandadsshed]

Great to hear!

[@fastabonjdebonj4889]

Thanks! Just copied you completely - worked a treat. You just saved me £100+. There's a pint for you in Portsmouth if you ever come this way.

[@burgersnchips]

I don't fully understand how this worked but it did! Thanks!!

[@erswell961]

Thanks v much! Sorted our CM907 - works like new. Used a hairdryer for heat source - 2 tries and back came the screen. No landfill or expensive replacement either. And music is fine. Jazz Club……nice! (Fast Show ref 😀)

[@mygrandadsshed]

Glad that it help

[@phoden]

Tried this and it worked a treat, thank you for sharing, don’t go on EBay and pay money for a similar video

[@mygrandadsshed]

I did not realise that buying a video on ebay was a thing!

[@phoden]

Yes some people are charging for a video on how to do this,I also tried this on a screen that had a similar problem in my caravan and it worked on that too; I used a hair dryer on that one: saved me £350 against a new one so thank you for sharing

[@XTREMRIDER1]

I repair mine thanks to your video ! Thank you 👍

[@mygrandadsshed]

Great!

[@WhosthatTeamAFC]

Just tried this on an Emerson 1F95EZ. It worked pretty damn good. Not 100% perfect, but pretty close. Thanks.

[@JanieJane6149]

Hi,just want to Thankyou very much,followed your video to the letter,all singing and dancing again 👍🥰🇬🇧

[@joeice9779]

Thank you for your video, managed to fix mine.

[@marystevens7396]

It totally worked! used a hairdryer instead of a toaster.... thankyou!

[@otarie12]

Merci beaucoup, ça marche! Many thanks, it works!

[@David_Parr]

Thank You It worked on my 10 year old Display unit. Thanks Again

[@vidalcorporatio5512]

Great video. I have a question. I have the same problema with a digital termometer. Can I do the same work for ir?. Thanks

[@leeryan8424]

Can something like this be done with a hot tub topside display. I can pretty much see nothing on the display. Sometimes very faint. Seems to be holding condensation.

[@giusepperindone4035]

Merci beaucoup , en 10 minutes j'ai pu réparer mon thermostat .

[@Eragonskull]

work very well, thx from italy!

[@tees_trials]

Smooth operating lad!

[@renatopizarro5316]

Hello, maybe you can help me, I replaced the damaged lcd display of my Boafeng UV-6R. When I install a new lcd, it has a high contrast, only when the battery is low does it allow reading. Thanks

[@actually775]

Brilliant, thank you. Perfect!

[@toty1ka]

Repairing with a toaster. You are a legend :D

[@Jon-em4kc]

Thanks for the video. Time to do mine, it's pretty awful now 👍😂

[@mygrandadsshed]

Good luck!

[@juliopires5783]

Meu display LCD só aparece a parte de cima dos dígitos. Oq pode ser?

[@abdulbilakhiya6026]

Appreciate sir , congratulations

[@UzunKamis]

I have to work on my multimeter, which has some ghost segments. Thank you.

[@jwstolk]

I ended up buying the much cheaper 2-wire on/off version, which has the exact same screen module. That module works perfectly in the wireless CM927 version.

[@mygrandadsshed]

Do you have a part number for that - as other people may be interested in the swap.

[@jwstolk]

@@mygrandadsshed It was a CMT907G1003, and the display module is still working fine with the old CM927 unit. Swapping the display module was even easier than buying a new CM927 as this solution preserved all the settings and I didn't need to re-pair it with the wireless receiver.

[@mygrandadsshed]

Thanks - I've posted a reply to @Giuseppe Sanfilippo who was asking in the comments of my video without the loud music :)

[@GeorgeGeorge-xj2bc]

There are available in the market cheap soldering irons with flat tips for soldering especially these types of ribbon cable and also are available the cables since they are used widely in car dashboards for displaying various informations.This kind of repairs are time waisting because if not totally got broken it might or not work or even if works it lasts for a very limited period of time.

[@benoitbourdaire4194]

Hi there, don't feel confident at all doing this. Could you do it on mine? How much would you charge?

[@pmadelshawkat2648]

It works with my acc chek active screen thank you so much

[@andrewvoller7620]

Absolutely fantastic, saved me £125. Took me three times, didn't have cue stick in the correct place and third time went with toaster heat for longer and just at pointed towards ribbon edge. You are a ledge.

[@SD1fruitbat]

You just saved me ~£100! Cheers.

[@DaTestKa]

Thanks. I have followed the instructions. Easy to follow.. But I think in the glue between the screen and that white background has worn off and it flaps open 04:19 . What kind of glue i need to stick them together again if needed. Thanks

[@mygrandadsshed]

I don't know what that tape is - probably a version of Kapton tape which holds the screen flexi-connector onto the PCB. This is why I used the packing shown at 6:58 while it was being heated. Another viewer suggested an ice lolly stick as about the right size to start with.

[@DaTestKa]

@@mygrandadsshed thanks. The question is does it need to stick together? I have cooked the screen few times by now but the digits still showing as half...

[@mygrandadsshed]

The tape is only to support the solder connection beneath. It should prevent it cracking when pressed back into the plastic.

[@DaTestKa]

@@mygrandadsshed so the white base has nothing to do display. I thought it worked as digitiser or something 😃 looks like my display is broken then. I don't understand the whole cooking process

[@user-od3rl5mc]

So is the principle here similar to reflowing a motherboard?? - Do you think this would work on a dead smart phone screen?

[@majidmajedi5794]

can not hear with nurve racking music

[@alicegkrok]

Thank you so much for this video, I am going to get this going during the weekend, but first, I wanted to see what those red and black conductor things are called so I could order some. Many thanks

[@mygrandadsshed]

The clip leads go by several different names: crocodile clips, clip probes, test hooks, test spring clip

[@alicegkrok]

@@mygrandadsshed thank you very much!

[@Pehr81]

why dows heating the display fix it? does it fix the crystals somehow?

[@mygrandadsshed]

The crystals are not damaged. The heat reconnects the flexible connection to the green circuit board. This is why the packing is important.

[@Ripae]

How many degrees do you calculate? I'd use a heat gun. Thanks!

[@mygrandadsshed]

The original manufacturing process would have has either used a IR or vapour phase solder reflow profile. Search for 'solder reflow profile' and look at the temperature time profiles. With a heat gun you need to be careful as it could get too hot. The slow ramp at the start of these profiles is to ensure that the components on the board don't crack with thermal shock. Target temperature should be around 200°C and no hotter than 250°C.

[@spicky2966]

Same problem-Going to try it with soldering Iron and aluminum foil

[@iandownie2450]

Great video very informative but but I just used a hairdryer to heat the screen and ribbon worked worked a trear

[@aunelectone7850]

Thank you.

[@jonathanalmeida2452]

Very good, valeu.

[@rogeriocosta1035]

Good video! Maybe would be better to use a heat gun with temperature control. It is a very useful tool for people that like to DIY.

[@martinswindell8337]

I’ve tried your technique to fix mine, but it didn’t work. When I press on any of the panel buttons the screen goes blank. I then have to shake it to get the screen back which is very annoying. Anyone got ideas what the problem could be? The digital display is perfect otherwise..

[@mygrandadsshed]

If you inspect the flexible connection between the screen and hte board is there a crack in any of the conductors. Depressing the button will twist/bend the board causing slight movement. It could also be the power input connect.

[@martinswindell8337]

Thanks I’ll check that info out

[@Samson.Boedefeld]

Put mine in the oven and it worked 😂🎉

[@rathnayakarathnayaka185]

wath yuse film neme and tip

[@dave3987]

Are you able to repair my lcd

[@Giggler.]

Rated !

[@robocop5338]

SOMEONE TELL ME WHAT THIS SONG IS?!?!?!?

[@mygrandadsshed]

The first track is, James River - DJ Williams The second from 5:31 is Shawl Paul - Norma Rockwell Title music is Ersatz Bossa - Sting

[@marcholbeck3286]

good video but ffs is the music really necessary?

[@InsetSand740I97]

Broken CM927

[@yavuzdemir9420]

Put the Cigarette Gelatin on the display conductor contacts. Then move the pen with a soldering iron to the right and left for about 1 minute, it will be fixed.

[@InsetSand740I97]

1:19 Looks like 2G

[@Nbhats]

Nice music video

[@jonycreche2731]

Apparently Granda is deaf

[@neilmcluckie159]

Pity about the irritating fluctuating volume of background music which drowns out the rather quiet speaking. I tried old Harry's method which worked.

[@mygrandadsshed]

Please see where I've removed the music & normalised the audio: kzbin.info/www/bejne/nIjJgWyZlLOBn68 but anyway glad that it helped you on the way to saving another unit from landfill.

[@PhD63]

Good instructional video but ditch the music.

[@mygrandadsshed]

I have already done so - linked in the description and posted as a suggestion video....

[@PhD63]

@@mygrandadsshed Well done.

[@peddersoldchap]

How about either talking louder or having the background music volume lower? Do you actually watch the videos you make?

[@mygrandadsshed]

How about you read the description?

[@peddersoldchap]

@@mygrandadsshed HAHAHA Fair enough!

[@peddersoldchap]

@@mygrandadsshed Don't get me wrong it is a really interesting video.

[@lucychen6267]

Excuse me, are you interested in being our sales representative？

[@ytrew9717]

the music is annoying

[@zeez3139]

Combination of music and mumbling make is difficult to understand

[@soteful9949]

music drowns out what you are saying.

[@anwaraldubaiyan7763]

Them music is very high and yr voice is very low and we are in real trouble!!

[@mygrandadsshed]

Is the real trouble people not seeing the link to the version with better audio?

[@d7a7s7]

music is a pain

[@sweden61]

extremly enoying music

[@Friend_of_the_One-Eyed_Ladies]

Wow, new low for audio quality. Yikes, that's bad. Kill the music, raise the voice audio level, and learn to talk out loud.

[@mygrandadsshed]

Thanks for the positive feedback, please see kzbin.info/www/bejne/nIjJgWyZlLOBn68

[@redangrybird7564]

Your video seems good, no need of shit loud rock noise (music?).

[@hotstarmusictv7711]

Take the music off and stop mumbling!

[@mygrandadsshed]

Thank you for your feedback. Please see here: kzbin.info/www/bejne/nIjJgWyZlLOBn68

[@jovervold1]

I’m sorry, but I couldn’t watch it. The music was driving me crazy! What’s up with that anyway? Lose the music!

[@mygrandadsshed]

I did, please see the link in the description.

[@shirinahmadi3249]

The sound of music is annoying

[@mygrandadsshed]

This seems to be the universal conclusion. Please post a comment on the version of the video that does not have music, so that the youtube search & ranking algorithm promotes that one more. Thanks. kzbin.info/www/bejne/nIjJgWyZlLOBn68

[@brianking3565]

Good tutorial ruined by that annoying music sorry to say

[@autolancegega599]

Annoying music in the background, 👎

[@mygrandadsshed]

I have posted a version without the music. BTW everyone who comments here to say the music is bad on this video causes youtube to promote it further, complementing the other video will help fix that ;)

[@DAS-Videos]

@@mygrandadsshed The music is terrible! :-)

[@raymorley1015]

That music killed it for ma - gave up watching

[@mygrandadsshed]

I can understand that, which is why there is a link with no music in the description and numerous other comments.

[@jeffboyle5037]

GREAT MUSIC! 🤮 Now if we could hear the person talking....

[@thecosmologist]

Ruined by bad music, bad audio level, jumping all over the placed.

[@mygrandadsshed]

thanks for your comment, please see where I've removed the music & normalised the audio: kzbin.info/www/bejne/nIjJgWyZlLOBn68

[@thecosmologist]

@@mygrandadsshed thank you so much, the video is great, but I couldn't hear what you were saying, I'll take a look at the update.