Honeywell Galaxy G2 low voltage problem

galaxy_owner · Nov 1, 2021

hello all,

I have a Honeywell Galaxy G2-20 burglar installed in my home (about 9 years old).

Recently I got a Battery Miss fault showing on the keypad. So I replaced the battery in the main panel with a new one.

It was ok for a few days, then the fault re-occured. So I checked the main circuits in the main panel and found that the Aux and Battery Charging circuits are only at 4.0V DC (they should be around 13V DC according to my understanding). For reference I have checked incoming power 240V AC power supply and it is fine. I also checked the transformer output voltage and it is 17.9V AC (which I believe is also fine).

I tried disconnecting all detectors (just keeping the keypad and bell connected) and when I re-test the Aux and Battery Charging circuits the voltage only goes up slightly to around 4.3V DC. (I also have an zone expander board (Rio) on this system which I disconnected in this test).

This would lead me to the conclusion that there is something wrong with the PCB. Since this is an old alarm they don't make this version anymore. There are a few used ones around on ebay, but i'm not sure I want to try those.

Has anyone come across this type of issue before?

Is the PCB the most likely fault?

If I do indeed have to replace the PCB is there a new version that would work instead? If so, do I need a new zone expander also or will the old one work with the new PCB?

Any help would be much appreciated.

buzzlightyear · Nov 1, 2021

If and if the pc board has a fault the only
Aternative is to put other brand in considering you have the pirs.

galaxy_owner · Nov 1, 2021

buzzlightyear said:
If and if the pc board has a fault the only
Aternative is to put other brand in considering you have the pirs.

Thanks for the response buzzlightyear.

Do you think there is anything else I can test to try and further diagnose what could be causing the low voltage problem?

You mention that the only alternative is to put in another brand, are there no updated Honeywell versions of this type of Alarm system anymore?

telectrix · Nov 1, 2021

probably find it's a semiconductor. in the power supply. check the beast in the heat sink, top left and also the electroytic capacitor below it. check for any signs of dry joints or excessive heat on PCB in same area.

galaxy_owner · Nov 1, 2021

telectrix said:
probably find it's a semiconductor. in the power supply. check the beast in the heat sink, top left and also the electroytic capacitor below it. check for any signs of dry joints or excessive heat on PCB in same area.

I took some pictures of the heat sink area. It's easy to see where the heat has affected the case and some cables above it. But can't see any visible damage to the PCB in that area.
The capacitor also looks ok (don't see any scorching or bulging).

telectrix · Nov 1, 2021

i reckon that semiconductor (thryristor?) is goosed. cpc farnell do suchbeasts for less than a pint of ale. worth a punt.

galaxy_owner · Nov 1, 2021

telectrix said:
i reckon that semiconductor (thryristor?) is goosed. cpc farnell do suchbeasts for less than a pint of ale. worth a punt.

Do you mean this part (please see picture below):

UNG · Nov 1, 2021

Fuse F1 is the battery fuse have you checked this fuse isn't blown

telectrix · Nov 2, 2021

no.that's a capacitor and be a good idea to replaceit. the part i refer tois screwed onto that aluminium heat sink. it should get fairly warm in use.

telectrix · Nov 2, 2021

UNG said:
Fuse F1 is the battery fuse have you checked this fuse isn't blown

even if it is, he should still get13.6V from the PSU.

galaxy_owner · Nov 2, 2021

UNG said:
Fuse F1 is the battery fuse have you checked this fuse isn't blown

Yes, checked that first, it's working fine, thanks

galaxy_owner · Nov 2, 2021

telectrix said:
no.that's a capacitor and be a good idea to replaceit. the part i refer tois screwed onto that aluminium heat sink. it should get fairly warm in use.

thanks telectrix, you mean this part below?

telectrix · Nov 2, 2021

galaxy_owner said:
thanks telectrix, you mean this part below?

yep.youmay have to do some searching to find out what device it is. try cpc farnell. a quick test would be to measure resistances between the 3 legs. diode tests with multimeter should show a couple of 0.6V.

Avo Mk8 · Nov 2, 2021

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

Avo Mk8 · Nov 2, 2021

telectrix said:
i reckon that semiconductor (thryristor?) is goosed. cpc farnell do suchbeasts for less than a pint of ale. worth a punt.

Certainly is less than a pint of ale at 28p

Honeywell Galaxy G2 low voltage problem

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