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toshiba lcd backlight is on but no picture?

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brainstorm:
Hi,

It does look like a TCon board fault, but what I would is to feed the the scart out of the Tv into another set and see if the fault is showing on the 2nd set, if it is then it is probably an AV board fault and if it isnt then it is probably an TCon board fault.

This method isnt foolproof but i find it works 99% of the time

Brian

mzone:
thanks brainstorm, never thought of that i gave it a try.

i tryed what you said.

i hooked it up from scart off tosiba lcd to a small portable tv with scart i also connected a component cable input from a dvd player, i can hear the dvd player playing on the lcd tv but blank picture and just snowy on 2nd tv, however if i press the freeview digital button on the lcd and switch tv to digital i get a picture on the 2nd tv of the freeview option but still blank picture on lcd tv so would you say t-con? picture comes on ok on digital with no faults showing.

i can not get a picture on 2nd tv when lcd is fed with a component input.

brainstorm:
Hi,

If Freeview picture is ok (2nd Picture) on 2nd Tv but blank on the Toshiba LCD then I would say it is more than likely a faulty TCON board.

If you are playing a DVD then you would probably have to scart it into your Toshiba LCD to then get it to output on to your 2nd TV(that way it would auto switch via pin8 of scart)

I dont know if the TCON board is available as a seperate item or not, I presume you have checked for open circuit SMD fuse on Tcon board?

If you are stuck (Try CHS) then let me know and I will try to find out if it is available and part number etc

Brian

mzone:
hi brainstorm yes the smd fuse is fine, i looked on chs they do stock this t-con but want a stonking £275 pounds   :chok: cant seem to find a cheaper alternative. :unknw:

i would be very gratful if you could possibly find out if this board is avalible please or if theres a substitute part.

i also forgot to include i have noticed the lds cable from the main tuner mainboard goes into another board before that boards 2 lds cables feed the t-con board but unsure what this board boards purpose is?

i have attached a picture showing both boards.

thanks

brainstorm:
Hi Mzone,

Wow this is an unconventional chassis! I have looked at it and the board that is feedinging the TCON board is called the Haniel Charis board! (not a board I have ever heard of before) It is the one marked PE0624. I think you will need a Schematic diagram  to work on this further.

The part number is 75013861 for the Haniel Charis board.

The TCon board is not showing in the service manual, so it is probably part of the LCD screen

I have tried to attach a couple of extracts from the manual to help you, Im not very good at the computer bit so I hope they are legible!

Brian

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