I have a CM927 which is a couple of years old.
Individual cells in the LCD screen are starting to fail - still usable at
the moment but a bit disconcerting.
Google gives a mixed picture.
Some posters say they have had loads of failures.
Others say they have never had a problem.
Anyone here had the problem with a CM927 - either own or supplied to
More importantly, have you had more than one fail?
Does applying gentle pressure to the display make the faulty segments
There are two common ways the LCD could be connected to the PCB.
A ribbon cable bonded to the glass,
or a clamp arrangement with a zebrastripe rubber connector sandwiched
The latter type often can be cleaned up successfully.
I've not had much success with the bonded type.
had the same problem found a diy fix in another forum
Strip the unit and remove the circuit board (just a few plastic clips, no
screws). Remove the LCD assembly from the circuit board (more plastic clips and
an eight pin push connection). Removed the LCD unit from the clear plastic
housing (more plastic clips). Finally heat up the plastic ribbon where it is
stuck to the circuit board (hair dryer will do trick) and then firmly press it
onto the circuit board... probably worth doing this several times; in effect you
are remating the ribbon to the circuit board by softening the adhesive. Put it
all back together and it should be working again.
worked for me
I wonder if that will work for the ribbon cable that is unreliable on
the LCD disply of our microwave. Several tracks are "broken" but if
you ramp up the humidity they work. This is a flat ribbon that splits
and is bonded to both sides of the glass of the LCD itself with a
rather sharp bend along the edge of the glass.
replying to Phil, Davo wrote:
My first thermostats digits died almost over night after about fours yrs being
on the living room wall...I contacted the installer and he charged me £70 for
replacement......guess what no 2 has now suffered the same fate...after doing an
Internet search I found lots of people had suffered the same problem...so I
opened up the old thermostat took it apart to reveal the lcd ribbon...very east
task with nothing more than a flat blade screwdriver just be gentle and
methodical and it won't fight back...heat up the ribbon with hairdryer....like
magic the lcd kicked back to life after being completely blank and in its
replacements box for almost five years
The hairdryer method definitely works for how long nobody knows but now I have a
spare so not worried anymore.
replying to Davo, nick wrote:
i had this problem this week - failing digits. A call to Honeywell was answered
promptly, and i received an email within 5 mins asking fort a picture of the
screen and the rear serial # sticker and a receipt pic ( not available.
i then had an email with a returns address and an offwr of a new CM927
so they seem to have sorted things at their end.
On Thursday, August 4, 2016 at 1:14:04 PM UTC+1, nick wrote:
I've replaced several CM927 mostly because the buttons stop working. Then I found that the old (more robust) design is still available but sold under the CENTER brand (I think that's Plumcenter).
replying to Davo, Leddy wrote:
Hi , I strip the unit down as you described but I couldn't see a ribbon (or what
I think a ribbon should look like) . The screen just had 8/10 metal prongs that
pushed into a unit . Is this the same unit you're describing? Look forward to
replying to Leddy, Simon wrote:
I have the same issue - I was able to access the circuit board easily and take
out the screen but I can't see anything like a ribbon, only a set of pins. I
tried heating these up but it didn't achieve anything when I put the unit back
replying to Simon, Fraser wrote:
If you remove the LCD display from its casing, it splits in two. The ribbon
cable is attached to the PCB by a large white sticky pad. I prised the pad away
a bit using a dental pick then blasted with a hair dryer. While still hot, push
the pad firmly back in place. Worked first time. The whole repair took less than
replying to rover218, Fraser wrote:
If I remember correctly, it's held in place with lugs. Just prize out the
display gently with a blunt knife while pushing the lugs aside. This photo might
not help but I can't get another one as the unit is back on the wall doing its
replying to Fraser, Karen wrote:
Thanks for the pictures Fraser, I'm afraid I couldn't have managed without them.
CM927 fixed and working perfectly well, saved me almost £100 so I am in your
debt... I love fixing things and of course saving money!
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