[SOLVED] Honeywell CM927 LCD screen fail - common? (2023 Update)

[Brian Gaff]

Yes this used to work on old lcd clocks as well. naff conductive glue or whatever it is seems desighed to fail. brian

[chelsworth.lodge]

Coming back to a very old post.

I have followed the instructions and got to the point where the PCB is out of the clear plastic cover.

I now have two main parts - the screen with a ribbon cable coming out of one side and the PCB.

However the PCB has a thick white foam backing with thin plastic behind it which in turn is soldered to a couple of pins on the PCB.

This covers the side of the PCB where the ribbon cable attaches. At first look it doesn't seem easy/safe to try and remove this and the foam to get at the PCB where the ribbon cable attaches.

So is this a different variant from the one described, or do I heat the green side of the PCB opposite where the ribbon cable is attached underneath?

[David]

Found a link in the discussion to which shows that you do have to lever off the white pad and swing it back on the soldered connections.

Will give that a go in a bit.

Cheers

Dave R

[Brian Gaff]

One issue I have heard about here is that often failures occur where the unit is located in the sun or in a very hot position. Still it sounds like a bit more environmental testing needed on their units before they sell them! Brian

[Rick]

replying to Michelle, Rick wrote: Well done! After mine failed recently I dismantled it and left it on top of the AGA cooker for a day. Full functionality returned so I put it in a sealed plastic bag with a load of silica gel sachets. Three days later and it is still working, so fingers crossed

[Jonathan W]

replying to Phil, Jonathan W wrote: Worked for mean my CM927!! Fantastic, THANK YOU. Clamped the LCD unit (PCB/white filler and glass) together with bulldog clips and used the hairdryer for about

10 minutes until screen went darker. I felt it would introduce the heat more gently and evenly than a toaster. Let it cool and then reassembled. Success.

[Danny]

replying to Phil, Danny wrote: Did Phil instructions a hay presto soon as the temperature came down from using the hair dryer all working fine that £100 cheers phil

[Brian Gaff]

I've hear this so often now, I'm beginning to wonder why the company don't fix the problem. Brian

[Bobby Boy]

replying to Graham., Bobby Boy wrote: Thank you Graham. Your post may be over 3 years old, but applying pressure and holding for 30 seconds did the trick.

[Paul]

replying to Phil, Paul wrote: And this is why I love the internet. 3 years later this post is still saving people money. Thanks for the guidance Phil, fixed it nicely.

[Robby E]

replying to Phil, Robby E wrote: This is an old thread but I wanted to thank you. I have just fixed mine. I would add it is the back of the LCD unit (green part) that needs to have heat applied . I could see the ribbon on the edge but didnt realise it joins on the whole of the rear. Apart from losing the LCD for 15 mins after digging my misses hair dryer out of the cupboard it was pretty easy. Also if you reassemble it face down the little rubber control pads sit in there located holes. Thanks Chap !

[_lurcher]

replying to David, _lurcher wrote: CMS 927 Honeywell room thermostat if the display fails it will come back by placing in a bag with moisture absorbing crystals but Honeywell replaced my 5 year old one free of charge after I contacted their consumer support.

[Bob Eager]

a) David has probably fixed it over the last 3 years. b) Notice the SOLVED bit at the top?

[Michael Valentine]

replying to Phil, Michael Valentine wrote: Thanks Phil - this solution certainly did the trick ! Cheers Mike V

[AntRob]

replying to Phil, AntRob wrote: Just found this through google search, Phil you are a life save, it worked a treat, thank you very much

[Pablo G]

replying to Phil, Pablo G wrote: How do I strip the CM927 to get to remove the circuit board please?

[jtelfordgoo]

Yes, it worked for me. It didn't work first time but I found that heating u p the circuit board (and the glass) for quite a long time with the hair dry er (about a minute?) and squeezing the circuit board and the glass together between finger and thumb, moving them up and down the length of the edge w here the ribbon is, seemed to have been the trick. Thanks. John

[David]

replying to Karen, David wrote: I have had about 6 of these over the years. All went the same way , digits disappearing. I have used the hairdryer trick once and it worked for a few months but then failed again! I have abandoned this model now (had the same problem with an earlier CM67 too) and installed a hive system. There is a bit of a market for faulty units on ebay which is handy.

[myrtle]

replying to David, myrtle wrote: Yes I have 2 of them and both of them have failed to the point they are now useless

[Heather]

replying to Paul, Heather wrote: Yes same here Paul, slight improvement each time but on 4th try all digits are now visible. Thanks so much Phil, you genius!