Picture of Repair a Malfunctioning LCD
This Instructable will show you how to repair a LCD that has dead rows and\or columns using a minimum of time and tools. The example shown here is a small LCD in a cordless telephone, but the same principle can be used in other devices as well.
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Step 1: Tools Needed

Picture of Tools Needed
This fix can be performed using a minimum of tools. You need only the tools necessary to disassemble the device (in this case only one screwdriver was necessary), a hot-air gun (a powerful hair dryer may work), and a pencil eraser.

Step 2: Disassembly

Picture of Disassembly
Disassemble the device to expose the LCD. Obviously, this step will vary by device. If you are having trouble getting your particular device apart, try Googleing "'yourdevicename' disassembly".

Step 3: Prep the Screen

Picture of Prep the Screen
Prepare the screen for repair by exposing the ribbon cable on the backside of the screen. In this phone, there is a plastic clip holding the LCD that must be temporarily removed. A plastic-coated paper clip is a handy for holding the LCD down while you work.

Step 4: Repair the Connections

Picture of Repair the Connections
Using LOW heat (you do not want to melt the ribbon or the solder on the board), slowly heat the ribbon cable where it is connected to the mainboard to soften the glue. At the same time, gently but firmly rub the connection strip with the pencil eraser.
1. Try to avoid directing too much hot air onto the LCD itself as this could damage it.
2. Apply enough heat to melt the glue holding the ribbon connection, but not enough to melt the cable itself.
3. If after the first try the problem is not resolved, try rubbing the connections down with something firmer. I repaired two identical phones using this method, and the second one required that I use the back of a plastic screwdriver to force down the connections.

Step 5: Results

Picture of Results
With any luck, your results will be something like this. This repair, including disassembly, took approximately ten minutes to complete and the results are excellent; the screen is 100% functional again.
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ebasir2 days ago

Thank you very much. It took me about 30 minutes due to a more complex at&t ML17929. I'm still mising 2 top lines, but it was much better than the BLANK display I had previously. Maybe with some more heating and rubbing, it would be 100%. I used a hair dryer on the low heat setting.

anjibern20 days ago

I fixed my daughters little bookmark dictionary that wasn't displaying anything. Worked like a charm. Thank you so so much!

kontrol1 month ago

I have an atomic clock / indoor thermometer with a large display. There are pads on the little circuit board, but no ribbon cable. Can anyone explain to me how these work? Any repair tips? I really do not understand how the information gets from the pads to the panel.

mario596 years ago
I WOULD LOVE if it works... I have a Sharp multifunction graphical calculator that has THE VERY SAME display ribbon connector and LCD.... I REALLY, REALLY, REALLY, REALLY, REALLY, REALLY, REALLY, REALLY, REALLY, REALLY, REALLY, hope this will work also for me!! I was in eager to find a suitable solution on the net and maybe you did my day! This evening I'll RUSH home and try it! Thanks friend! ciao Mario
calculators arent that expensive , lol
Mine is, and mine is cheaper than some others that I've seen and want. TI 84+SE w00t, my calc rocks!
Beats mine. I got a TI-83+. I want an nSpire.
Don't those have less archive than the 84+SE? The graphics look nice, but I'm used to my 84+SE.
I'm not sure about the complete specs, but the thing that gets me going on them is the ultra high res display.
What is the display? I know the 83+/84+ is 94x62 one bit gray scale, but I don't know the nSpire.
320x240 4-bit grayscale. Pretty impressive for a calculator. It even offers antialiasing. Though they do make full color graphing calculators, but those are a bit out of my price range.
Ti-89 rules them all =:)
Why not just get a cheap old laptop and install http://www.graphcalc.com/, then your graphing calculator will have a full querty keyboard, 1024x768x32 res, and wireless intartubes.
most tests say no calculators with full qwerty, so you would have to use Divoraks or something


How exactly does the 89 rule the nSpire?
oh ok , my bad . you can run java applets on some grahpics calculators , they are just begging to be hacked :)
I haven't seen those... I'm drooling already!!!
If all we did was throw away broken items, never attempting to repair them, then we'd be piling up a lot of trash while wasting a lot of resources and effort. How does a 15 minute repair job compare to the hours required to produce and assemble a new calculator?
He said graphing calculator. A basic one costs around $60, and top of the line ones exceed $500.
marcomcarneiro made it!1 month ago

Thank you! I've found this old Sharp Scientific calc in the dumpster and it had several blank spots. Was about to throw it out again and decided to give it a shot with your Instructable, and it worked out just fine! Yay!

Daelke made it!1 month ago

Brilliant! This works! Thanks!

Daelke1 month ago
FireSword2 months ago

Thank you! I was able to fix my old GE DECT phone, one of the headsets had the same problem!

StevenS132 months ago
I am having trouble of missing segments & symbols of my mitsubishi car central lcd. the lcd is connected to the pcb using 64 pins.when pressing some pins gently the problem will go but the pins are not soldered on the lcd glass so I can resolder, they are just clamping on the glass screen. This setup is rare I cant find info about how to fix this.
Help me please.
earn1013 months ago

Just repaired my Honeywell CMS921 thermostat display, fully working save £75+ Thanks!

Salils3 months ago

Has anyone done this with a TI-83+ graphing calculator or similar? I'm not sure which cable/part of the cable is likely not making contact? I'm missing a row of pixels. Any thoughts?

Salils Salils3 months ago

ps: I've tried a couple places but I'm not sure where is most likely and I'm afraid to be too aggressive with the heat gun until I'm certain.

natalya.no.33 months ago
Thank you so much!!!!! I fixed my Angelcare ac 401 monitor. Thought it's dead for ever, but now it is working! !!
radiumfu3 months ago

Very helpful, I fixed my kill a watts P4480, will try fix my 2001 Audi A4 dashboard center LCD display panel.

PlumsteadT4 months ago

Im struggling with a Casio fx85gt. If anyone can help me, Im at the ribbon stage. If you can help me please reply! Or at least guide me.

Photo on 11-03-2015 at 5.17 pm.jpgPhoto on 11-03-2015 at 5.16 pm.jpgPhoto on 11-03-2015 at 5.17 pm #2.jpg
PlumsteadT4 months ago

Im struggling with a Casio fx85gt. If anyone can help me, Im at the ribbon stage. If you can help me please reply! Or at least guide me.

Photo on 11-03-2015 at 5.17 pm.jpgPhoto on 11-03-2015 at 5.16 pm.jpgPhoto on 11-03-2015 at 5.17 pm #2.jpg
JDurbin075 months ago
assbanger5 months ago

Excellent method !!! I recently repaired my trusty CASIO fx-911Z calculator. Tools used – hair dryer. Probably the proper (not too high) temperature is the key, not the pressure itself. My LCD started working properly some time after the heating took place. Probably the adhesive set again properly. Kudoz to you !

SparkyRadar made it!5 months ago

Thanks! I was able to repair a "Kill-A-Watt""P4480" power meter that had lost all of it's digits on the LCD display (just a few "ghost" segments). Applied heat from heat gun & rubbed down the ribbon where it attaches to the PC board with pencil eraser & the edge of wood nail file. This meter has lots of screws to remove to get the circuit boards loose but was worth the effort...a replacement is $45. or so.

nitin.deoli6 months ago




ThusharaA17 months ago

I made it.I fixed my Nissan Quest LCD display for fuel and tempreture .Thanks for your vedio.

Your the best mate. It worked perfect
tcambrón8 months ago

Thanks maan. I was thinking of doing this on a TV. Other TV repair people only put some rubber padding thing. When putting the LCD frame back on the rubber padding will press against the tabs. Today was my first LCD repair I did so I did with what tips I know and was going to try the heat gun thing next.

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