Toshiba 23wlt56b

[joehezzer]

Hi all I have just picked up this set up. The problem I have is it that the green light is on at the switch but no screen (no picture). Its had a new backlight inverter board fitted so I have sound but no picture I have voltage to the inverter 12. something volts. Could it mean the T-con board is duff, the voltage I was getting at the T-con board was about 5 volts even when set is turned on cheers for any help in advance

[joehezzer]

Re: Toshiba 23wlt56b

[aaronwt6]

Re: Toshiba 23wlt56b

Could you post a nice clear picture of the power supply output voltage label? 12 volts to the inverter doesn't sound right to me. Typically its 24V.

[joehezzer]

Re: Toshiba 23wlt56b

will just have a look now

[joehezzer]

Re: Toshiba 23wlt56b

[aaronwt6]

Re: Toshiba 23wlt56b

Oh, external supply. I'm not familiar at all with this setup so I'll have to take a step back and let someone else chime in. Sorry about that.

[joehezzer]

Re: Toshiba 23wlt56b

no worries aaron, thanks for your help though. The power supply is new and so is inverter board

[joehezzer]

Re: Toshiba 23wlt56b

[joehezzer]

Re: Toshiba 23wlt56b

ok bottom centre of the board there is a medium sized cap just above that the words say s+3.3v
+5v so i presume when its on standby it reads 3.3v and then when the set is turned on and the screen powers up it reads 5v. so could that mean the stand by cap has blown am i right thinking that

[joehezzer]

Re: Toshiba 23wlt56b

anybody

[tom66]

Re: Toshiba 23wlt56b

This is actually a Vestel set. Rebranded garbage... Ugh.

For most regulators, the output voltage won't vary in standby, so the +5V and S+3.3V may be separate indicators for different regulators.

[joehezzer]

Re: Toshiba 23wlt56b

I get the impression tom you really like these sets lol

[tom66]

Re: Toshiba 23wlt56b

Heh, generally not too bad to repair, but they're really badly engineered and designed, and they fail a lot more than they should.

[joehezzer]

Re: Toshiba 23wlt56b

so do you think it could be T-con boards thats failed.

[joehezzer]

Re: Toshiba 23wlt56b

ok so i have just fitted a new t-con board still not screen. just put a torch up to the screen and i can see the the screen, hoping the second hand new inverter board aint shot, its looking that way

[ben7]

Re: Toshiba 23wlt56b

ok so i have just fitted a new t-con board still not screen. just put a torch up to the screen and i can see the the screen, hoping the second hand new inverter board aint shot, its looking that way

Not yet, it could be a bad backlight bulb, or a bad high voltage wire (arced and shorted out).


But, to try and see if the inverter board is the problem:
1. Test the resistance of the secondaries of the inverter transformer(s).
2. Also look for any fuse(s) on the inverter board, and if there are any, test them to see if they are blown.