Repair broken LCD in 71b



#3

Hi,

Lucky me was able to find a math-module that was offered together with a 71b. No problem I thought, I get the module and then either have a spare calc or can offer it to a better home.

Unlucky me however got the pain-cramps when the calc arrived. The seller had packed it very densly and tighly. Hence the LCD became part of the 'shock absorbing material' and promptly broke! It now sports a large Rorschach test blob in the middle (with broken glass lines) and a small blob on the left. (It is the LCD glass that is broken, not the cover glass on top...)

Now, here is my question to the wizards here - is there a way to replace the LCD in the 71b? I opened up the good thing (with my newly acquired Torx screwdriver!) but it seems the LCD is put directly in the PCB that also holds the keyboard. So the only thing that seems 'replaceable' is the full upper halve of the 71b with keyboard and all.!? Is that correct?

If not, is there a description on how to replace the LCD (I have another 71b which has a fine LCD but otherwise looks like it has been used as a chewing toy for a medium sized dog...)? Or is there someone who can perform such a procedure? Or, last but not least, does someone have a superfluous 'upper halve' with good keyboard and LCD that they'd like to sell/trade?

Thanks so much in advance, in the meantime I'll try to recover from the sight of an otherwise AAA+ 71b with broken LCD...

Cheers

Peter


#4

Quote:
Now, here is my question to the wizards here - is there a way to replace the LCD in the 71b? I opened up the good thing (with my newly acquired Torx screwdriver!) but it seems the LCD is put directly in the PCB that also holds the keyboard. So the only thing that seems 'replaceable' is the full upper halve of the 71b with keyboard and all.!? Is that correct?

Unfortunately that's what the official HP service manual for the HP71B says. Component level repair was performed on the lower (memory) PCB, but any fault on the top PCB meant a complete new top case.

In your case (!) I'd probably dismantle the machine with the broken display as carefully as I could -- cut away the heat stakes removing at little plastic as possible. If you find you can get the PCB out, I'd then do the same to the machine with the mangled case and swap the innards over.

I believe the HP71B service manual is on the Australian Site, BTW


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