Electronics > Beginners

Fixing Calculator LCD missing pixels

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sairfan1:
Please refer to below image this calculator LCD is missing pixels, when i press this ribbon cable it shows correct digits.  A quick google shows some people fixed it by applying hot air and some with soldering iron.
I want to know what is better option, hot air gun or soldering iron? (i have both tools) I also want to know what temperature should be applied in any case.
On some posts i saw that wide face metal is most helpful, any thoughts?

mathsquid:
I’d use hot air and a pencil eraser. Heat the ribbon cable a bit, then take the eraser and press down on the cable and rub the eraser along the direction of the wires. I’ve managed to fix a few LCD issues by doing this.

I wouldn’t use a soldering iron. I’d be afraid I’d melt the cable.

james_s:
Put a piece of paper over the ribbon and rub a soldering iron across that where the joint is. I've fixed the same problem on several Gameboy handheld games that way.

rpiloverbd:
I think a hot air gun is better. But, sorry. I can't recommend any temperature without knowing the model number of the LCD and seeing its datasheet.

PKTKS:

--- Quote from: james_s on January 24, 2022, 04:35:15 am ---Put a piece of paper over the ribbon and rub a soldering iron across that where the joint is. I've fixed the same problem on several Gameboy handheld games that way.

--- End quote ---

I use a proper TIP for that...

Mileage will vary but the proper the tool greater the chance..

Paul

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