Electronics > Projects, Designs, and Technical Stuff

LCD design, is this good enough?

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JCCyC:
I'll have two!

demod:
Thanks, just ordered one!

demod:
Finaly had a chance to look at my PC-1.  Definitely has an LCD problem.  Before the new LCD when I power up it I get a display like it is trying to enable all pixels.   I don't think this is a LCD problem.  Has anyone seen this before?  I can't see any obvious issues.

After a reset it changes slightly, and very occasionally it will have a constant beep tone, until reset again.  (see attached pics)

Not sure I want to change the LCD when it is like this, might be a waste of time.

(is there somewhere people are discussing repairs to these units?)

aldweb:
Hello,

So, I could replace one LCD to one my devices, with success, wonderful. I left a positive review on robertbaruch's Tindie page, he so much deserved it for his work!

When finalizing a second device LCD replacement, still with success (LCD working with full contrast), I had an issue in the final step when you want to remove the wiper on the contrast pot to get the right contrast, because the pot just broke apart (white plastic part to old?)

Reading back this thread, robertbaruch wrote back on April 9th: "A qualified success! Qualified because (a) I still need to reproducibly replace an LCD without several tries, and (b) you have to replace the contrast adjustment with a 240k resistor."

So, would it be enough to unsolder the plot, replace it with a 240 KOhm resistor?
What resistor would you recommend? Would this one ( https://www.conrad.com/p/metal-film-resistor-240-k-axial-lead-0207-06-w-1-1-pcs-421022 ) work for instance?
If you had any picture of the final result, this would help me, thanks.

Thank you for your help,
aldweb

aldweb:
Hello,

I will answer myself, in case somebody else would be interested in doing the same thing as me when you find yourself with a defective contrast pot or fail to remove the wiper as explained in robertbaruch's instructions.

So, I replaced the contrast pot with a 240 KOhm resistor.

I removed the contrast pot and cleaned the area from any remaining soldering --> see first picture
I then soldered the standard 240 KOhm resistor --> see second picture

After that, the replacement screen worked like a charm  8)

Cheers,
aldweb

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