Back light problem

[vinceroger69]

Re: Back light problem

Just repaired an Alba lcd32880hdf. Was puzzled until I read this thread. Replaced c230/c231 3kv, television worked perfectly. Checked for dry joints, seemed ok. Couldn't fault old capacitors in any way, they read same as replacements. Got spare caps off Darfon backlight board,v144. 16 on that board. I would have bought replacement board, hopefully, the p.s.u. board. Thanks vinceroger69.

glad some of my input helped you sort the set out and another set saved from the landfill too.

[ron77]

Re: Back light problem

Just repaired an Alba lcd32880hdf. Was puzzled until I read this thread. Replaced c230/c231 3kv, television worked perfectly. Checked for dry joints, seemed ok. Couldn't fault old capacitors in any way, they read same as replacements. Got spare caps off Darfon backlight board,v144. 16 on that board. I would have bought replacement board, hopefully, the p.s.u. board. Thanks vinceroger69.

[snipersquad100]

Re: Back light problem

Problem solved, It was those two caps, and they were 3kv I took out as well.
Many thanks to all that helped.
Merry Christmas and a happy new year to all on the forum.

[snipersquad100]

Re: Back light problem

thanks tom.
just goto wait and see if it fixes it.

[tom66]

Re: Back light problem

I think 3kV will be fine there, for 32" panel voltage unlikely to exceed 1.5kV starting, 900V operational.

[snipersquad100]

Re: Back light problem

o shit I ordered 3k, the voltage don't go over 3k does it?

[vinceroger69]

Re: Back light problem

cpc a very good site imo good prices takes about 2 days to get to you. i thought they was 5pf 6kv have you checked what your old caps say?

[snipersquad100]

Re: Back light problem

ok joined cpc and ordered the 5pf 3kv caps

[vinceroger69]

Re: Back light problem

Can I use 80pf cap instead of the 5pf.
Tom that cap you asked me to measure was unpopulated.

i would keep it at 5pf if possible.

[selldoor]

Re: Back light problem

When cpc dont have the offer there is also rs components in pontypridd.
and various other places round the uk. Also I mention because I think it has been there forever and I like the name Cricklewood electronics. In Cricklewood
but post is reasonable IF they have what you need - not great stock or maybe just hard to find.

[snipersquad100]

Re: Back light problem

Can I use 80pf cap instead of the 5pf.
Tom that cap you asked me to measure was unpopulated.

[tom66]

Re: Back light problem

cpc.farnell.com have free delivery from £0.01 and stock Panasonic capacitors.
Maplin capacitors are often worse than originals.

[snipersquad100]

Re: Back light problem

yes maplins is s**t but cant think of anywhere else in the uk to buy electronic components other than online.
Thanks Manndave

[newtothis]

Re: Back light problem

Cant get those two caps in Maplins, it must be such a high technical component for them to stock lol
I'll have to order them.

Maplins.... no No NO NO NO! LOL

Maplins caps are no good. They are general purpose. You need good low ESR caps

[Manddave]

Re: Back light problem

Hi just thought I would let you know that I repaired one of these recently.
It had the backlight problem. I replaced the two 3kv caps shown here
Hope this helps

[snipersquad100]

Re: Back light problem

Cant get those two caps in Maplins, it must be such a high technical component for them to stock lol
I'll have to order them.

[vinceroger69]

Re: Back light problem

http://www.toms-service-manuals.com/
tom66 member whos helped you on page one

[snipersquad100]

Re: Back light problem

Whats toms site?
I reflowed those caps but still the same. I get new ones tomorrow or order some.
im off to bed now.
Thank you.

[vinceroger69]

Re: Back light problem

no there free two downloads a day a verygood site imo.
tom66 site has good schematics as well all free or can donate to his site.

[snipersquad100]

Re: Back light problem

you didn't pay for that schematic did you?