Sharp EL5100 calculator.
in [Repair]
|
From: ian field on 17 Nov 2006 11:52 Anyone know what causes dark clouds to gather along the top edge of the LCD?! This calculator has been sitting on a shelf for years and when I tried to use it found the batteries were flat, the seals had begun to sweat a little and my first though was electrolyte contamination. Careful examination showed the slight leakage was more or less confined to the individual button cell compartments, the LCD internally has a Cd plated metal surround which was pristine - no evidence of electrolyte contamination. To make sure I dismantled the calculator and stuck all the buttons on double sided tape to keep them in the right order while I scrubbed the casing with detergent. The plastic window must be polarising as there was no sign of the clouds with this off the LCD. Another thing that makes me doubt electrolyte contamination is the cause, the various enunciators along the top edge of the LCD seem to cut an overlap out of the cloud effect. Ideas anyone?! TIA.
From: ian field on 17 Nov 2006 13:41 "Meat Plow" <meat(a)meatplow.local> wrote in message news:pan.2006.11.17.17.05.58.707000(a)nntp.sun-meatplow.local... > On Fri, 17 Nov 2006 16:52:27 +0000, ian field Has Frothed: > >> Anyone know what causes dark clouds to gather along the top edge of the >> LCD?! >> >> This calculator has been sitting on a shelf for years and when I tried to >> use it found the batteries were flat, the seals had begun to sweat a >> little >> and my first though was electrolyte contamination. Careful examination >> showed the slight leakage was more or less confined to the individual >> button >> cell compartments, the LCD internally has a Cd plated metal surround >> which >> was pristine - no evidence of electrolyte contamination. >> >> To make sure I dismantled the calculator and stuck all the buttons on >> double >> sided tape to keep them in the right order while I scrubbed the casing >> with >> detergent. The plastic window must be polarising as there was no sign of >> the >> clouds with this off the LCD. >> >> Another thing that makes me doubt electrolyte contamination is the cause, >> the various enunciators along the top edge of the LCD seem to cut an >> overlap >> out of the cloud effect. Ideas anyone?! >> >> TIA. > > I would say just a deterioration of the crystal due to air seeping in? > > -- > Pierre Salinger Memorial Hook, Line & Sinker, June 2004 > > COOSN-266-06-25794 Would that clear around an active display segment? It seems more likely that air ingress would cause complete and permanent malfunction in the affected area. But then I'm obviously hoping its not air seepage!
From: Homer J Simpson on 17 Nov 2006 21:33 "ian field" <dai.ode(a)ntlworld.com> wrote in message news:fNl7h.1985$0x.459(a)newsfe1-win.ntli.net... > Anyone know what causes dark clouds to gather along the top edge of the > LCD?! Bleeds? Just a poor display. The original Radio Shack Pocket Computer is notorious for this.
From: Fred McKenzie on 17 Nov 2006 21:39 In article <fNl7h.1985$0x.459(a)newsfe1-win.ntli.net>, "ian field" <dai.ode(a)ntlworld.com> wrote: > Anyone know what causes dark clouds to gather along the top edge of the > LCD?! Ian- I don't know about yours, but mine has a completely black LCD display. I haven't done anything about it after several years, but it would be neat to restore it to operation. Does anyone know where I would look to find a new display? Fred
From: ian field on 18 Nov 2006 13:48
"Homer J Simpson" <nobody(a)nowhere.com> wrote in message news:liu7h.15164$C94.8792(a)edtnps82... > > "ian field" <dai.ode(a)ntlworld.com> wrote in message > news:fNl7h.1985$0x.459(a)newsfe1-win.ntli.net... > >> Anyone know what causes dark clouds to gather along the top edge of the >> LCD?! > > Bleeds? Just a poor display. The original Radio Shack Pocket Computer is > notorious for this. Sadly that may be true - some of the Radio Shack calculators were Sharp ones in disguise. |