A better way to repair your Honeywell LCD display
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- เผยแพร่เมื่อ 18 ต.ค. 2024
- ** This is a FREE repair video if you have missing digits and is only for the Honeywell CM901 , CM907 , CM921 , CM927 and CM937 **
Do characters disappear on your Honeywell CM900 series screen , making it hard setting up and use the unit? This is a common fault on these units and can be repaired. Many videos circulate on the internet where the connection is pressed on the LCD with heat (iron, hairdryer, toaster, ...) and thus offers a temporary solution to the problem. Also payed repair services use this same method. Don't be stupid, this is only temporary! Use your brain! After a few months almost all characters disappear and you can throw away your expensive thermostat! They receive so many positive reactions because it does indeed help, but only for a short time and after that it is worse than before! Follow the steps of this video and your thermostat will be repaired in a good and long-term way. Attention: some dexterity is required.
The true value of a human being is determined primarily by the measure and the sense in which he has attained to liberation from the self.( Albert Einstein )
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Thanks Petr, great video!
I could repair my two Honeywell CM927 by carefully following the method you described. I could buy the zebra strip on AliExpress.
But I had to use my binocular microscope to correctly align the LCD display and the PCB and for verifying the cleaning of the contacts.
Thank you.
The alignment
Thanks Petr! Great video; I had to use the heat method every year again; now I finally hope to have a more definite fix. It is more complicated but it will hopefully save my 2 Honeywells and keep them going for some more years.
Hello Petr, typically I don't write public comment, but in this case I had to. Thanks for the detailed video. With this, finally I could successfully repair my screen (I hope it will last for a long time). The short-term heating methods worked for only 2-3 years (I had to do that each year), but this year it failed finally. Your method took me approx. 9 hours total with many trials. First, I ordered the zebra stripes from the mentioned ebay seller, and followed the steps you showed. The aligning part took a lot of time, and I tested the alignment before gluing with tape fixing only. Then it took a while until I could find a similar tube. The first problem was that the Pattex glue I bought didn’t work with the tube. Then I bought a plastic glue (for PE+PP), and it worked. The next problem I had with the soldering part, it just melted the tube (I only have a 100w piece). I tried again from the beginning with a new zebra stripe, and this time I used a simple lighter, which worked, but nothing appeared on the screen. I was about to put the screen in the trash bin, but before that I unfolded the screen and replaced the zebra stripe with the original one, and it worked:)
The preparation cost me approx. 25 EUR, so it might not worth it with the extended repairing time, but I didn't want to replace this thermostat, so thank you, you helped me saved it.
Best regards,
Miklos
Hey Peter, just finished this fix and it has worked beautifully. The zebra strip came from Switzerland and cost £14 but the rest I had to hand. A bit of patience and some careful measuring saved me money I don’t have right now! Just about to hit winter and the thermostat is back on line. Thanks for posting!!!
hello, here Petr, the author of the video. I have no access to my account anymore and use the account of a friend to answer some of your questions. The video has no sound because I like the sound of silence. The lenght is 47mm ( L47 or l47, hence the confusion). The repaired thermostats do , to my knowledge, all still work perfectly. Greathings, Petr.
Very nice repair but the lucky helped a lot since contacts are in the bottom side of glass and are aligned perfectly to the pcb contacts so the vertical conductor pad did excellent job that will last forever.
Great video. I tried but without success. I wonder what you use at minute 7:42 to clean the contacts: cloth or very fine sandpaper? At minute 10:32 everything seems to have been erased on the glass.
Thank you very much.
Translated with Google translator.
Hello Petr, Thanks for your video and explanation. However, I struggle to find the proper zebra strip online. Any tips regarding availability in the Netherlands?
Genius and very calm and relaxed! Thank you!
Thank you for the link, much appreciated
Would you tell me how to adjust Honeywell temperature controller from Fahrenheit to Celsius? Thank you.
Do you think it can work only with the strip? I mean well aligned but just pressed?
Would it work if you just glued the heat shrink over the existing connector and used heat to pull it together?
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two questions. Doesn't this apply quite a bit of asymetric force on the LCD screen? (torsion) and then, I'm not sure how this would work better than simply using a properly sized zebra strip? ie the force of contact is either externally applied (your method) or internally applied (with a slightly thicker zebra strip, the polymer applies the force)
Thanks for sharing your method. Doug
Hello Nitrous Man, only at the moment you press both sides together with the vise to heat and thus shrink the shrinking tube there is a possibility you brake the glass. ( due to the force of the vise, not the force from the shrinking tube) . I did maybe 20 and never broke one. Once out of the vise the pressure on the strip is small but big enough to make proper contact and avoid dirt going in. Sorry for the late answer but I do not look very often on my youtube account. Good luck, Petr.
Hi Petr this looks like a really good video. I have two CM927s which have stopped working and have done the heating method before and the displays came back just enough to be able to control heating but now they have both gone again. Unfortunately I don't have all the tools required (soldering iron) or skills to do this and wonder if there is any chance I could pay you to repair mine please? Not sure where you are in the world but I live in London, UK. Regards Ann
Hello Ann, I can do the repair for you for free , but I want to keep my privacy. I live just on the other side of the channel. It depends on your motives. You want to save some money to pollute on someting else or you care for your environment and repair as much as possible? How to come in contact with respect of my privacy? Greetings, Petr.
Hi Petr,
Ik bekeek net jouw fantastische video en vroeg mij af of ik tegen vergoeding mijn display zou mogen opsturen naar jou om te repareren?
Hi I cannot find the Zebra strips (Elastomeric conductors) anywhere apart from china. could you help at all. Thanks
Hi to all! I'm unable to find the correct dimension zebra strip on ebay or other sites. Do someone know where I can buy the strip? Thank you!
Wow engineering poetry, here in UK I cant can't get zebra strip any help please. thank you for your excellent video.
Hello Jox Vox, look at :
www.ebay.co.uk/itm/264231544663?hash=item3d856d6757:g:k~4AAOSwzkRcg7RK
or
www.ebay.com/itm/223429813541?hash=item3405746525:g:yJQAAOSwrn9ceXmy
Does not take long from US. Good luck.
Tried this method, with great care, but it didn't work -- I suspect alignment as you suggest at the end. I couldn't work out quite what you were doing at 11.24 where you're using a pad of post-it notes (to create a slight offset?). There seems to be a measurement in mm on the pad -- and the calliper must be significant here -- but I can't decipher what the measurement is. Could you clarify / confirm this is what's happening at this point? Thanks for and otherwise excellent and ingenious video
Hello Ken , I use the post-it notes to create an object of ~1.5 mm thick ( about 17 post-it sheets) which is the offset needed between the glass and the pcb so that in 9 of 10 cases the allignment is correct straight away. But you should check the allignment with the eye and eventually correct it before continuing the repair. It is very important to look at a perfect 90degrees angle to allign. I have repaired many thermostats this way and they still work perfectly. Good luck, Petr.
@@petrhaydn2287 Thanks very much for this Petr. I shall certainly try this second time around.
Ken, to save yourself a lot of frustration watch the video again, at 4.05 the White paper sticker is completely intact and you can clearly see the number 251530 on the board, now check the video from 15.55 onwards, the number is now obscured by the yellow plastic and the White paper sticker has a small hole in it and the top edge is damaged, now go to 22.00 onwards, the number is visible again and the White paper sticker is perfect again, so it looks like buying a new LCD display and pretending to repair and obviously old damaged one, then actually fit the new one so it looks convincing is the way forward. Hope this saves you a lot of wasted time and effort sir.
@@JackalCDS , you are apparently a distrustful person , and usually this is justified. Except this time. Those inconsistencies you see are because I had never made a video before and needed to copy / paste from 3 attempts until I had something usable. ( dead battery , blurred image , too long video, wrong format , too big size, ...). I don't gain anything by telling people lies. I just want to share my experiences for free in this video. But I don't belong in your world either , so just buy a new thermostat from china and thus pollute this world some more so that there is nothing left for our children and grandchildren. Greetings, Petr.
Hello, is the size of the conductor 3,5x2x147 or 3,5x2x47?
I guess you worked it out. It is an "l" for length, not a "1", therefore 47 mm.
Need more instructions. Can you do a step-by-step write of each of the steps?
Hello Cais Zak, in the video there are already written step-by-step instructions. Tell me which step is not clear and I try to give a more detailed description. Regards, Petr.
There is no audio on this film, why ?
Does anyone have tips on how to get it off the wall....a video would be great. Ive tried pressing in the clips near the batteries but no luck it just wont shift off the wall. Thanks
hello london, by now you have solved it for sure but for other readers : take out the batteries and you see the sign of a screw-driver left and right wit a triangle pointing to where to put the head of a medium sized flat screw-driver and twist ( keep the other side of the screw driver (where you grab it) down while you twist) , do the same on the other side. Once both sides are unclipped just pull the cover. Greetings, Petr.
You can no longer read
I'm confused as to the size of zebra strip I need. What is the length? The video suggests 147mm but it looks much shorter.
I need to know before I order some that is too small!
Need more step-by-step instructions
Good morning,
Would you like to do that service for me? I could send you the item.
Kind Regards,
Kamil
I there no sound
To save yourself a lot of frustration watch the video again, at 4.05 the White paper sticker is completely intact and you can clearly see the number 251530 on the board, now check the video from 15.55 onwards, the number is now obscured by the yellow plastic and the White paper sticker has a small hole in it and the top edge is damaged, now go to 22.00 onwards, the number is visible again and the White paper sticker is perfect again, so it looks like buying a new LCD display and pretending to repair an obviously old damaged one, then actually fit the new one so it looks convincing is the way forward. Hope this saves you a lot of wasted time and effort folks.
I could repair my lcd with this method, so I can say it works, but hard to do.
you are apparently a distrustful person , and usually this is justified. Except this time. Those inconsistencies you see are because I had never made a video before and needed to copy / paste from 3 attempts until I had something usable. ( dead battery , blurred image , too long video, wrong format , too big size, ...). I don't gain anything by telling people lies. I just want to share my experiences for free in this video. But I don't belong in your world either , so just buy a new thermostat from china and thus pollute this world some more so that there is nothing left for our children and grandchildren. Greetings, Petr.
So looks like you weren't successful in your repair but others were! So you write a nasty comment to petr - why take your frustration out on someone who is trying to help?