Goodmans LD2667D Inverter 1a fuse blown - what else?

[notallbad]

Inverter b/d : VIT70063.50 Rev.3

All voltages on PS and Main A/V b/d present and correct.

Tv fully works except the backlight is not coming on,BLOn and Dim voltages present and correct, can see the image on screen when lit up with a torch.

Checking the inverter b/d there appears to be a fuse, F1 1A 76V thats OC. Reads 23.6v on one side but not the other side.

F2 7A 160V checks OK.

I have read a couple of other threads here regarding changing F1 thats fixed it but no real mention of having to check/replace any other components, surely a fuse won't just blow for no reason? Any ideas what to check and how?
Thanks

[tom66]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

It is a very common fault on CMO inverter, just replacing fuse usually fixes it.

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

OK Tom Thanks

So other than 1A and equal to or higher than 76v are there any other specs I need to know for a replacement fuse, i.e. Time Delay or Slow Blow

[tom66]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

32V fuse is fine (and more common), inverter is 24V rated.
1 amp slow blow type.

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Cheers, I shall try to source one, shall try ebay

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Found the fuse I needed on a spare inverter board, TV now working. But still need to source a couple of these fuses as I have another exact same TV with same symptoms but need to investigate further and also replace the fuse back on the spare inverter board.

Just to be cautious I disconnected all the lamps first and powered up checked the fuse then connected one lamp at a time, each time checking the fuse was still ok.

CHEERS TOM66.

[tom66]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

For future reference, even if a lamp on the inverter output were bad (shorted or open) the inverter would just shut down. It wouldn't fry.
A 1206 size fuse should do.

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Thanks again.

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Any idea if a Nintendo DS Lite fuse would be suitable, I have only been able to find one person on the internet that gives an indication of the rating, 1a 32v 0603 smd, but not sure how accurate he is.
http://gbatemp.net/threads/dsi-fuse-value.266116/

Oh yes and a guy on Youtube who says 1a 0603 smd.
http://www.youtube.com/watch?v=6OHvspGaiSY

All the fuses sold on ebay for DS repair do not state the ratings, I wonder why?

Or maybe a better question to ask is whats the difference between 0603 1206 etc... is this the form factor of smd, physical size and does the bigger the size then have a higher power rating? Would the 0603 be ok to use?

[tom66]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

0603 is half the size of the 1206, may be difficult to make it fit.
32V is just a minimum you could use 63V, 76V, 125V, etc.

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Well fixed 1 tv with blown F1 fuse but this other one just keeps blowing the fuse, I replaced it with one of these, perhaps bought the wrong type:

http://www.ebay.co.uk/itm/20x-TR-321...item2a178fdf2e

[tom66]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

That is fast acting. You need time delay / slow blow type.

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Bummer, knew I would miss something when ordering in haste.

Maybe I'll just short it across.

Trannys seem ok.
No sc between chassis and 24v supply line or lamps.
Caps 'look' ok.
Mosfets not shorted.

[tom66]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Bad engineering practice. OK for test if you're willing to handle the damage but never return to customer or sell on with bridged fuse!

[notallbad]

Re: Goodmans LD2667D Inverter 1a fuse blown - what else?

Totally agree, I would never dream of doing something like this and pass on or sell on. I do have a conscience and work ethic, honestly.

Sorry, should have mentioned that it would only be for testing purposes and prepared to take on board the consequences, i.e further damage.

I did actually try another fuse but this time had all lamps disconnected, powered up then down, checked fuse, still ok.
Re-connected one lamp at a time and powered up and down and checked fuse, fuse checked out ok each time until all lamps connected and now working!! Doesn't figure?

Perhaps a dodgy fuse??? Shall fully test tomorrow (later today) and do so for a week or so before shifting this one.