ALKATEL Desk Telephone ID Caller Repaired
I received this telephone in this condition that the LCD display of caller ID completely was dead.
The owner of telephone said by neglect telephone was fallen on the floor and after that LCD never turned on again.
Telephone itself was working good without ID caller. This problem could be of broken LCD or detaching of heat seal flat either one.
I opened the telephone and then I opened the LCD box, all accessories of LCD were installed inside this box. the heat seal paper flat of the LCD was not completely attached to LCD and partly was detached from LCD due to shock that telephone was received on the time of falling from the table to the floor, but when I push my finger on the paper flat and push that part to lcd body the digits were appeared on the screen.
This means that the LCD and the related IC are healthy.
(of course this is somehow also a common problem in humid part of the world that the humidity solves the glue and then evaporate by environment heat this cos the heat seal flat detach from LCD and the LCD will be no longer turn on any more.)
By above experiment I got this hope that by replacing the flat the LCD will return to life again. Then the job for replacing the bad flat paper starts:
- since there are many type of heat seal flat available in the market but in different size and numbers of graphite lines, first I count the graphite lines on the paper flat of mentioned, telephone, they were 12 line. I had in my stock such flat but with more graphite lines , by cutting I reached to my desired size
2- I removed the old paper flat from the LCD and pcb completely
3- I cleaned the surface of LCD, the place that old graphite lines were attached and sticked to the LCD, (by the help of thinner and Q-tips)
I also cleaned and made it shiny the pcb part that the other side of flat were attached on pcb this must be very clean to see the golden color of metal on the board
4-Most important part of this reinstallation of heat seal flat is: the graphite lines on the flat must be match to the lines on the LCD, one by one this needs some exercises as well as experience.
6- after I stick the flat to LCD same side that the old flat was sticked. by pressure of wrist and heat of special hammer head soldering iron (one must hold the head of the hammer head upon the flat for the few seconds till the flat stick to LCD)
Note 1: if you are working in the room with cooler and/ or cooling air condition you have to turn off it otherwise the heat of hammer head would not be enough.
5- after above steps same procedures are applied for pcb part of the flat .
6-after installation the new flat we must cover that portion of flat that is sticked to LCD and pcb with strong stick cloth ribbon to protect the flat against the heat and humidity of environment otherwise the life span of our job will be short
7- by connecting the telephone line to telephone showed that flat is correctly installed and lcd is on and digits appeared on the screen and The LCD of telephone returned to life again and telephone rescued
Cost of this repair was few cents.
NOTE 2: for installation of flat we need some exercises and after getting experienced many machines will need us for such services.
Note 3; the material of telephone flat was paper but I replace it with plastic film flat that is stronger.
This article was prepared for you by Mr Beh from Iran
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Albert van Bemmelen
July 23, 2019 at 7:32 pm
Very professionally done repair Beh, but how the flat was attached to the LCD was not very clear visible. I understand that you really soldered the flat to the glass LCD which I luckily never needed to do before. The other end of the flat you soldered to the LCD pcb module underneath. I didn't know that soldering to the glass LCD was possible. Of course in most 16x2 and other modules (also in LCD watches) the contact to the glass LCD normally is done without soldering with 2 rows of carbon rubbery conducting sheets.
beh
July 24, 2019 at 9:41 am
Actually, I did not solder the flat to glass just by the help of heat and pressure I stick the flat to LCD just in the correct place and then this job completed by strong cloth ribbon glue and that hold the flat and LCD together and forever also for PCB part same procedures applied this method works if you have doubted you may try one time and see what happen.
Parasuraman Subramanian
July 23, 2019 at 8:42 pm
An overwhelmingly professional and thorough job, something only a dedicated expert like you can do! What a great work! I learnt a lot of things from this article; how humidity can affect a cable, availability of such flat cable, there is a way to attach this, and so on and on. A feast for technicians like me! Many, many thanks for sharing and may God bless you!
beh
July 24, 2019 at 9:45 am
you are welcome. I am happy you liked this article and find it useful.
Henrique J. G. Ulbrich
July 23, 2019 at 10:49 pm
Very good, Mr Beh. A very professional and patient job. One more skill I´ve learned. However, I had hardly understood what heat seal paper flat means, mainly due to the use of the expression heat seal. By the sense of your report, it seems to be a flat cable (or ribbon cable). Is it?
beh
July 24, 2019 at 9:46 am
THANKS
Yogesh Panchal
July 23, 2019 at 11:09 pm
Good Job! Beh
Mihai
July 23, 2019 at 11:37 pm
Hello, Mr. Beh ! I have two phones with lcd screen working partially. Now, thanks to you, i learn something usefull. Tkank's again for sharing your experience with us !
beh
July 24, 2019 at 9:52 am
Many many telephones are waiting in the world to receive such services if you repair one for your customer you will see many more telephones that are coming to you for more services and since the cost of repair is nothing all you receive from customers are just pure benefit
Robert Calk Jr.
July 24, 2019 at 5:11 am
Good job, Beh! That is very tedious work!
beh
July 24, 2019 at 9:54 am
Hi, Robert
thanks for your supports.
beh
Ghashaan
July 25, 2019 at 2:36 am
A work of absolute precision! I have never tried to fix a broken LCD before but I think I'm ready for an attempt now.
beh
July 26, 2019 at 2:37 pm
ok go ahead .I am sure you will repair it.
Waleed Rishmawi
July 25, 2019 at 12:36 pm
A job well done. Congrats.
beh
July 26, 2019 at 2:38 pm
Thanks WALEED.
Jayachandran Durganathan
July 30, 2019 at 1:27 am
Thanks Beh,
I was always wondering how to stick the flat connector to the LCD and PCB, this repair article of yours, really helped me to widen my learning skills, thanks again for putting up a repair article with good illustration and upto to the point. keep it up, expect more repair articles from your in the near future.
Regards,
Jayachandran Durganathan
beh
July 30, 2019 at 2:07 pm
I am really happy you found my report useful .please ask me if you have any questions about this kind of repair, and you are welcome.