technosonic lcd3201s

[selldoor]

Re: technosonic lcd3201s

I use desolder wick to remove most of the solder then heat each pin levering it up gently
with a toothpick. once you have a small gap it gets easier. The darfons I have replaced
have always had a plastic pin on the base which fits in a hole in the board.
Never heard of anyone repairing the actual transformer

[budm]

Re: technosonic lcd3201s

If I were you, if you already know that you have one transformer is bad, more likely the other may go ut later on also, it happened to me a few times already, if one transformer is 10 pounds each you may be better off getting the broken board cheap for may be 20 pounds then you will have some spare transformers, I am sure the bad board will have at least one or more of good transformers on it, just a suggestion.

[tom66]

Re: technosonic lcd3201s

I think you are getting confused between an inverter and a transformer.

Each of those grey things on the board is a transformer. There are 6 to 12+ on a board depending on how many CCFLs there are. In this case it looks like one transformer drives two CCFLs.

The entire assembly including the control circuitry is the inverter.

It is these transformers which goes bad.

Yes it is possible to repair the transformer but it's seriously not worth your time. Do you want to rewind a 1000 turn coil? And you'll need a spool of magnet wire which will probably cost you more than a new transformer.

The failure of the transformer is due to a consistent manufacturing defect in Darfon inverters. PlainBill says it is probably due to the wire being too tight causing arcing.

[senndogg]

Re: technosonic lcd3201s

thank you tom66. it is a bit hard for me the "technical english language" (english its not my native though i speak it better than french and italian which may seem easier), but i will get used to special words
i did examine the broken transformer and i agree that repairing it is time consuming and worthless.
budm: i was thinking that too, an inverter board would suit cos i'd have a lot of spare ones but its not cheap. 150$ seems a lot.

[senndogg]

Re: technosonic lcd3201s

w about this? specs looks the same. http://www.ebay.co.uk/itm/Bush-32-ID...#ht_712wt_1396

it would cost me 70$ including shipping, but can i rely on a used inverter board? what if it would give problems with the transformers?
should i change only the defective transformer or the entire board and keep the old one for spare?

[senndogg]

Re: technosonic lcd3201s

this sounds cheaper, 55$.
http://www.ebay.co.uk/itm/32-EVESHAM...f0e6e02aa#shId

[selldoor]

Re: technosonic lcd3201s

It will always be a gamble buying used items. Most people will tell you what THEY would do but it is your choice. If it was me I would buy one of the boards, having made sure it was an exact match and put in the whole board
and test it- ( If it doesnt work then you can think about pulling the transformers off it). Keep the old one as spares or sell off some of the transformers or keep a look out for a set with the same fault and try to repair that.

Obviously if you could get a very cheap faulty tv that had a board that used the 4003L transformers that might be the way to go. On the laws of average it should have some usable transformers and other "spares"

If its any help at all I havent used the company but I do know Recycling Lives it is in the city where I live.
http://www.recyclinglives.com/
and they are legitimate. In the UK all the councils run recycling depots. The items are sorted and then sold on. I Think Recycling lives gets the electrical stuff from the council here, dismantles, tests and sells the parts.

It annoying really as I see loads of tvs id like to "play" with at the council recycling but you cant get hold of them.

[senndogg]

Re: technosonic lcd3201s

i was asking cos i think that this tv will be the first of a lot of others which i will repair, and repairing them is what i'll do for a living. i finally settled in my home town, and know have my own computer related and general electronics service shop/store. i just want to know whats the best way, collecting several pieces and waiting for a tv to fit, or just ebaying the parts i need?