datadiffusion Posted August 3, 2015 Share Posted August 3, 2015 (edited) No, newer keypads are square although if you are 100% comfortable with the whole DIY thing, an older 9330 LCD keypad would cover the exact same space (esp. if the existing keypad was a newer 9827) and work even with a brand new 9561PD or a 9571 9853 etc.... However you would almost certainly be buying that 2nd hand, although new unused ones do turn up on ebay from time to time. Our advice is always to get professional help / installers, although any DIY questions are welcome on our forums too. Edited August 3, 2015 by datadiffusion Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted August 3, 2015 Share Posted August 3, 2015 Mains could have surged when they put the power back on. Quote Link to comment Share on other sites More sharing options...
charlie6 Posted August 3, 2015 Share Posted August 3, 2015 I agree, in fact almost a 100% certainty. Quote Link to comment Share on other sites More sharing options...
PeterJames Posted August 3, 2015 Share Posted August 3, 2015 Al-Yeti - It's a 9800. Installed late 1990. Thanks for the instructions to power up mains first, I'll try that. Some other info I've seen online talks about a full cycle but battery first. Does mains first cause a different boot cycle? If the battery does not have enough charge in it it may not power the system fully, this could cause the system to not boot correctly. Mains first will power the system fully, and then charge the battery Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted August 3, 2015 Share Posted August 3, 2015 But in this case sounds like the old disappearing NVM issue. Mains could have surged when they put the power back on. I think more likely the NVM has been dead for years but by fluke the panel has always had either mains or just enough battery until now.... Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
charlie6 Posted August 4, 2015 Share Posted August 4, 2015 I agree It's possible, but would need some qualification, what test would you recommend for confirmation ? Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted August 4, 2015 Share Posted August 4, 2015 No test required, NVM failures that presented like this were very common on this panel, even in its heyday, power fail or not - but often after a complete loss. I can only assume there was a design issue on this panel that meant the NVM IC was either overvoltage or written to far more than was really needed or recommended by the IC manf. Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
al-yeti Posted August 4, 2015 Share Posted August 4, 2015 Well the chip only had a certain amount of write cycles so would eventually fail anyway Quote Link to comment Share on other sites More sharing options...
norman Posted August 4, 2015 Share Posted August 4, 2015 Personally, if the panels been OK and is still serviceable (apart from the obv) I'd look to replace the chip (IC5? iirc) Quote Nothing is foolproof to a sufficiently talented fool. Link to comment Share on other sites More sharing options...
datadiffusion Posted August 4, 2015 Share Posted August 4, 2015 (edited) Yes it's a one wire I2C EEPROM chip, obsolete but freely available on the secondary market for a reasonable price. Edited August 4, 2015 by datadiffusion Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
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