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+--- Thread: REPAIRED:HP22S display working but with dark elliptical stain (/thread-12652.html)
REPAIRED:HP22S display working but with dark elliptical stain - isanchez - 03-20-2019 03:50 PM
(I cut this repair explanation embedded in another post with different title, to allow a better access to the information about repairing procedure)
This method can be used in any Pioneer series display, with the same pathology.
Hi,
just to report that I have finally repaired a HP22s and a HP32s displays following your recommendations (thanks!!).
The process was absolutely satisfactory:
-Open the calculator following one of the many tutorials available.
-Remove the board, leaving the display accesible.
-No not remove the display in any way.
-Remove the two zebra connector stripes (the black band goes towards the display)
-Peel the silvered adhesive plastic sheet that is adhered to the display.
-Clean carefully the display glass with alcohol, removing the glue stains (if present).
- This is the most critical issue: what can be used to replace the mate silver coated sheet? I suggest the mate side of home-use aluminium foil...I have tested many sources without optimum display tone. Remember : the mate side, not the bright. Carefully cut the proper size..
-Place this sheet in the display and use your finger to place it avoiding wrinkles!!
- I find there is no need to glue the aluminium foil to the display...
-Place the zebras back in the right position (black band faced towards the display center)
-Install the board back (tightened firmly) and test the calculator before putting the back side back.
-You can glue the heads the four posts around the battery area. I do not recommend to glue the inner posts, as they can ruin the keyboard mechanism. I do not glue any part...it all keeps in place with solvency, just pressing it all back in place.
That's all!
I have pictures, but high res...if you want, I can post them...after resizing.
Hope it helps,
Kind regards
Ignacio
RE: REPAIRED:HP22S display working but with dark elliptical stain - EugeneNine - 03-20-2019 04:45 PM
At home/hardware stores they sell aluminum tape which might work well. Its basically for duct work or floor underlayment.
RE: REPAIRED:HP22S display working but with dark elliptical stain - isanchez - 03-20-2019 05:29 PM
Yes, thanks!
I have found an aluminium adhesive roll used in heaters isolation. Could be also suitable.
(not used in this case).
I do recommend not to remove the board so much times...the fixations trend to break easily after some bending/unbending process.
Regards
RE: REPAIRED:HP22S display working but with dark elliptical stain - isanchez - 03-20-2019 05:32 PM
Yes, thanks!
I have found an aluminium adhesive roll used in heaters isolation. Could be also suitable.
(not used in this case).
I do recommend not to remove the board so much times...the fixations trend to break easily after some bending/unbending process.
Regards
RE: REPAIRED:HP22S display working but with dark elliptical stain - isanchez - 03-20-2019 05:41 PM
Some pictures...
you can see the final result...