Honeywell Galaxy G2 low voltage problem

[DPG]

As above ^^^^
Seems to be a LM317T voltage regulator

https://cpc.farnell.com/stmicroelectronics/lm317t/v-reg-adj-1-2-37v-to-220-3-317/dp/SC08260?st=lm317t

Classic 3 terminal voltage regulator. Used many of those.

 

[galaxy_owner]

Hi all, just an update. I ordered the LM317T voltage regulator and also a replacement capacitor. I replaced the voltage regulator first. That has solved the low voltage to the Aux and Battery charging cable (both are now just above 13v DC). However, the keypad is not working, the screen is blank and every 15-20seconds it beeps, but the screen remains blank. I have charged the 7ah battery and tested it before powering up the alarm with it plugged in.

I then replaced the Capacitor on the PCB, but that doesn't make any difference. So now i'm stuck again. Not sure what else to try.

Note, before I replaced the voltage regulator I fully charged the battery and plugged it in and the alarm did work for a few hours (as it was being fully powered by the battery). So I know the battery is ok. So it's only after I replaced the voltage regulator that has led to this specific issue.

Any suggestions would be much appreciated.

Thanks

 

[DPG]

Going to be difficult diagnosing this remotely I think.

 

[buzzlightyear]

I then replaced the Capacitor on the PCB, but that doesn't make any difference. So now i'm stuck again. Not sure what else to try.

New system will solve it.

 

[UNG]

Have you checked that you have got power at the keypad

 

[Avo Mk8]

As per UNG, if you have the time, suggest checking power exists on all ic's, just to check no tracks got damaged during the replacements. Google for the pin-outs!

Have you got a circuit schematic by any chance? If not it may be time to consider a replacement ? eg:

Honeywell Galaxy G2-20 Full Metal Boxed Alarm Control Panel v1.44 (03.2009) | eBay

Find many great new & used options and get the best deals for Honeywell Galaxy G2-20 Full Metal Boxed Alarm Control Panel v1.44 (03.2009) at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

 

[galaxy_owner]

hi all, just an update. I actually got it working. A rookie mistake i'm afraid, I mis-wired the -ve on the keypad which is what caused it to beep every 15-20seconds. So it's all working now.

The main fix was the voltage regulator that I replaced on the PCB.

Thank you all for your input/advice, it's really appreciated.

 

[telectrix]

nice to get the feedback. (not just because my post#4 was the solution. ???).

 

[galaxy_owner]

nice to get the feedback. (not just because my post#4 was the solution. ???).

Indeed it was!

Thank you Telectrix !!!

???