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Old 5th May 2020, 2:40 am   #1
deepspacedaz
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Default Fixing a GEC BT 302 Television

Before attempting to fix my Murphy television I thought I'd practise on this one any help appreciated. I have schematics If that helps. When I turned on the set sounded like the 2 amp fuse blew. I'm only just learning but I want to know more.

This is the tv in question
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Old 5th May 2020, 6:49 am   #2
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Default Re: Fixing a GEC BT 330 Television

Did the fuse blow have you checked it?
The post by Slidertogrid #14 in your other thread points to the capacitor across the mains input that could blow the fuse, did you remove this?

Remember these are live chassis sets and safe if treated and handled correctly but a shock hazard if not.

Some theory about power supplies and live chassis techniques used in radios and TV sets of this vintage is worth learning otherwise it’s just guess work.
That at least would get you safely started on the repair.
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Old 5th May 2020, 1:03 pm   #3
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Default Re: Fixing a GEC BT 330 Television

Yes, thank you I discharge the CRT with crocodile clips and a screwdriver pushed under plug and crocodile clip to chassis. I will send some pictures of the television open. I do see a very big capacitor bottom right-hand side.

PS Can I use a modern 3 amp the fuse is a glass 2 amp
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Old 5th May 2020, 8:42 pm   #4
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Default Re: Fixing a GEC BT 330 Television

No I wouldn't do that. If the fuse blew there is very little point in replacing it without finding out why it blew. You will just blow another fuse.
The large capacitor if it's a metal can isn't the one across the mains. The one across the mains will be a small wax coated one.
Take some pictures of the chassis around the fuse holder and the back of the on - off switch we may be able to spot the capacitor and advise from there. You are still in a similar position to the Murphy though in so much as the set will need all of the old capacitors replacing (at least) before it will work.
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Old 5th May 2020, 9:44 pm   #5
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Default Re: Fixing a GEC BT 330 Television

Here are the pictures of tv
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Old 5th May 2020, 11:31 pm   #6
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Default Re: Fixing a GEC BT 330 Television

Here are more pictures
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Old 6th May 2020, 10:13 am   #7
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Default Re: Fixing a GEC BT 330 Television

Link to a GEC GEC BT302 that received some attention to in 2017.

https://www.vintage-radio.net/forum/...d.php?t=123587

DFWB.
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Old 6th May 2020, 11:17 am   #8
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Default Re: Fixing a GEC BT 330 Television

It's worth mentioning before you dive in to the repair that both your sets work on the old 405 line system, so you'll need a 625 to 405 standards converter to use them with a dvd player etc. Without a converter these sets are purely ornamental. They cost around £200 so it's worth thinking about whether you want to invest in one before you go much further.

Best of luck,

Steve
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Old 6th May 2020, 11:24 am   #9
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Default Re: Fixing a GEC BT 330 Television

Yes thank you for the advice I have one, all my money goes into the 1950s furniture etc.

Can you tell me anything by these pictures? where shall I start etc
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Old 6th May 2020, 11:42 am   #10
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Default Re: Fixing a GEC BT 330 Television

I'd start by obtaining a copy of the circuit diagram.

I'd snip out any capacitor wired directly across the mains supply, the set will work without it.

Then I'd concentrate on the heater chain, testing it for continuity from one end to the other.

You can do all this without applying power.
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Old 6th May 2020, 11:57 am   #11
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Default Re: Fixing a GEC BT 330 Television

In your second photo in post number 5, the dirty wax covered cylindrical item at the bottom is the “mains filter capacitor” and it should be cut out and removed. Do this with the TV unplugged from the mains electricity supply (apologies if I’m “teaching you how to suck eggs”).

This TV looks to have been stored in a damp environment, which won’t help.
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Old 6th May 2020, 6:09 pm   #12
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Default Re: Fixing a GEC BT 330 Television

No all and information is very helpful, so I need to cut the mains capacitor
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Old 6th May 2020, 6:15 pm   #13
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Default Re: Fixing a GEC BT 330 Television

Do you mean this marked item? sorry If I'm sucking eggs lol I'm new to this.
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Old 6th May 2020, 6:39 pm   #14
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Default Re: Fixing a GEC BT 330 Television

The capacitor looks soldered to the chassis is this rite looks unfactory maybe it is I don't know ill send you pic.
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Old 6th May 2020, 6:41 pm   #15
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Default Re: Fixing a GEC BT 330 Television

Quote:
Originally Posted by deepspacedaz View Post
Do you mean this marked item? sorry If I'm sucking eggs lol I'm new to this.
Yes.
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Old 6th May 2020, 6:45 pm   #16
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Default Re: Fixing a GEC BT 330 Television

Quote:
Originally Posted by deepspacedaz View Post
The capacitor looks soldered to the chassis is this rite looks unfactory maybe it is I don't know ill send you pic.
If you’re referring to that dirty wax covered one that I mentioned earlier, then one wire is very likely to be soldered directly to the metal chassis, as it will normally be connected to the mains neutral when the TV is switched on (the black wire in the two wire mains lead).
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Old 6th May 2020, 6:49 pm   #17
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Default Re: Fixing a GEC BT 330 Television

I am yes I've cut it looks bad. I do have a multimeter.
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Old 6th May 2020, 6:52 pm   #18
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Default Re: Fixing a GEC BT 330 Television

Did you want to see a pic of the capacitor
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Old 6th May 2020, 7:10 pm   #19
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Default Re: Fixing a GEC BT 330 Television

I've completely removed the capacitor
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Old 6th May 2020, 7:14 pm   #20
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Default Re: Fixing a GEC BT 330 Television

Do you have a circuit for the TV?
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