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How can I tell if G24q base is damaged

Confuzzled

Dec 31, 2020
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Hi,
Sorry folks, but I am a complete electronics novice looking for help.
So please be kind.
And sorry if this is the wrong section for posting this question.
4 pin fluorescent ceiling lamp blew.
Bought a replacement and it does not work.
Could the lamp have damaged the G24q base?
How can I tell which is the culprit - is the new lamp faulty, or the base (fitting)?
Thanks for any help as I don't want to send the lamp back only to find the light fitting is at fault.
 

Bluejets

Oct 5, 2014
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Show a photo of the fitting so we know what you are referring to.
 

bertus

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Nov 8, 2019
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Hello,

There are several types of G24 bases.
Have a look at this picture:
g24-lamp-base.gif
There are 3 different G34q types.

Bertus
 

Bluejets

Oct 5, 2014
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Hi,
Sorry folks, but I am a complete electronics novice looking for help.
So please be kind.
And sorry if this is the wrong section for posting this question.
4 pin fluorescent ceiling lamp blew.
Bought a replacement and it does not work.
Could the lamp have damaged the G24q base?
How can I tell which is the culprit - is the new lamp faulty, or the base (fitting)?
Thanks for any help as I don't want to send the lamp back only to find the light fitting is at fault.

Possibly took out the ballast.
 

Harald Kapp

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4 pin fluorescent ceiling lamp blew.
So that would be a GQ24q type according to the picture in post #3.
A fault in the fixture, while not impossible, is unlikely. Check the wiring, the ballast, the contacts of the socket.
 

bertus

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Nov 8, 2019
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Hello,

It looks like that the G24q base is used with electronic ballasts only:
G24q Info.png
https://blog.1000bulbs.com/home/types-of-sockets

It could be that the ballast stopped working.

Did the new lamp go in easy and did it hold in the socket?
If it did not go in all the way, the dowel may be at the wrong position or you may need a Gx version.
The dowel position seems to be related to the power of the lamp.
This is what I found:
The G24q-1 is 10 or 13 Watt.
The G24q-2 is 18 Watt.
The G24q-3 is 26 Watt.
There even seems to be a G24q-4 wich has two dowels on each side and is used for 42 Watt.
G24q info.jpeg
Bertus
 

Bluejets

Oct 5, 2014
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Did the new lamp go in easy and did it hold in the socket?

Those fitings are a right pain in the butt to get out so maybe damaged when lamp removed.

It looks like that the G24q base is used with electronic ballasts only:

Not so....I have seen commercial fittings with iron core ballast.
 
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bertus

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Hello,

@Bluejets , I know the sockets are difficult.
I already had a couple that where so heated by the lamp that they became brown and brittle.
Pieces broke off when removing the lamp.

Bertus
 

Bluejets

Oct 5, 2014
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LED replacement solves any shorted ballast problem.......open ballast requires shorting wire fitted.
Also low heat from LED solves cooked lampholder......still a right pain to get out but can't have everything I guess.
 

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