Dim Display In Calculator Repaired
Yesterday when I am doing some calculations with my calculator I found the display on screen was very dim. I thought the battery cell of calculator was the problem. Hence I have opened the calculator to replace the cell. Suddenly I recalled that I have replaced it with a new cell about a month ago. I guess the cell could have been defective causing the dim problem. When I checked with my Multimeter I found that both the cells (showing 1.5 volt) were good. This means the problem could be in somewhere else.
Hence I have checked the output voltages on the wire where they are soldered, again I am getting 1.5V. I have checked the PCB for some loose connection or for open track –
I found nothing wrong. Inside the calculator does not have repairable parts- there are only four capacitors and one IC without any marking on it. See the photo below:
Even all the wires found to be good and no physical damage. Next, when I gently pressed the back side of the LCD Screen I found some life of hope because while I am pressing the LCD, the character on LCD was getting darker. So what was the solution?
I applied the hot air from the hair dryer on the back side of the LCD but when I look at the display from the front side I was shocked to see only dark colour on the screen. I was thinking that the calculator could be permanently gone and decided to put everything back to order. After fixing the cover and the battery and applying some force at one corner of the LCD and wiped the screen by pressing with my fingers, the calculator came back to life.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Waleed Rishmawi
August 5, 2014 at 3:21 pm
I face the same problem with the cordless phone screen display. even if I mess with the contrast adjustment button, it does not help so I use the hot air and most of the time, I get them fixed but sometimes not..thanks for sharing
Humberto
August 19, 2014 at 7:26 pm
Hi Yogesh Panchal, another device saved from the dump. Congratulations.
rahul
August 8, 2016 at 9:43 pm
sir accidently i put out my calculator screen with zebra stripes now how can i fix it
Brandon
August 5, 2017 at 8:18 am
Thank you, it worked for me. Calculator Staples BD-4610II
Thiago Vasconcelos
June 2, 2021 at 11:01 am
what the, I just moved it and it stopped being so dim. I fell like it must be because of built up pressure from the support to the lcd monitor. Perhaps I forçed it in overtime and the plastic found held it tight or dilation made some built up pressure inside. I know the calculator works, thanks for the suggestion of opening up the case!
Sonny
October 26, 2021 at 5:56 am
I fixed TI503 with your method and it works! This is how I did. I used the number 1 (cooler mode) on the hair dryer and gently and slowly heat up the display. Make sure you don't melt the plastic body! At one point the temperature of the glass reached to I don't know, maybe 80C?? and the polarization of the LCD started to change 90 degrees. You can see the screen becomes totally black instead of transparent. At which point turn off the hair dryer and wait for it to become clear again. That fixed my screen 100%. That realigned all the liquid crystals properly. Of course you can also perform general maintenance of the calculator or phone you're repairing at the same time. Good luck.