Toshiba 40D1333B no back light.

[budm]

Re: Toshiba 40D1333B no back light.

Pictures are TOO BLURR for me to trace out the circuit of the LED driver section.
Need straight clear shot pictures of the whole bottom side of this power supply/LED driver board.

[riget]

Re: Toshiba 40D1333B no back light.

Pictures are TOO BLURR for me to trace out the circuit of the LED driver section.
Need straight clear shot pictures of the whole bottom side of this power supply/LED driver board.

Hope these are better?

[riget]

Re: Toshiba 40D1333B no back light.

Found this,

[ReeceyBurger123]

Re: Toshiba 40D1333B no back light.

So you are 101% sure its not the leds ? Have you checked the diode for the 24V rail and the mosfet that switches the voltage for the leds ?

[riget]

Re: Toshiba 40D1333B no back light.

It's not the leds, I've got 24v going to the main board, don't know what diode/mosfet you mean.

[ReeceyBurger123]

Re: Toshiba 40D1333B no back light.

Right so you have 24v going to the mainboard so guess that the 24v is working. What about going to the leds ?

[budm]

Re: Toshiba 40D1333B no back light.

OK, so do you have the 24-80VDC at the two legs of the C316?
Did you verify that you do have BL-ON signal?

[riget]

Re: Toshiba 40D1333B no back light.

In standby I have 0v at the led connector, 1.4v at c505 and 1.7v at c316
when turned on I get 2v at led, 2v at c505 and 2.3v at c316

Thanks.

[speedypro]

Re: Toshiba 40D1333B no back light.

Hi all. I have the same board as riget and I get 2v going to the panel. I have pulled the panel a part and saw only strips. No led driver so I assume it's on the psu? Where?

[speedypro]

Re: Toshiba 40D1333B no back light.

OK, so do you have the 24-80VDC at the two legs of the C316?
Did you verify that you do have BL-ON signal?

I have 2v at mine.

[riget]

Re: Toshiba 40D1333B no back light.

Hi all. I have the same board as riget and I get 2v going to the panel. I have pulled the panel a part and saw only strips. No led driver so I assume it's on the psu? Where?

Hi, I managed to fix mine, it was a cap that took a transistor out, I can look up the numbers if you want to give it a go.

[speedypro]

Re: Toshiba 40D1333B no back light.

Hi, I managed to fix mine, it was a cap that took a transistor out, I can look up the numbers if you want to give it a go.

Yes please! My hands are already dirty. Or a picture of what you have replaced is perfect. Either.

[riget]

Re: Toshiba 40D1333B no back light.

Ok sorry it's late, the transistor is the one on the first pic of the top, top right hand side next to the heatsink, the smd cap is underneath near to it c525.

Thanks.

[speedypro]

Re: Toshiba 40D1333B no back light.

Ok sorry it's late, the transistor is the one on the first pic of the top, top right hand side next to the heatsink, the smd cap is underneath near to it c525.

Thanks.

is the transistor q216 or the mosfet q301? im lost, sorry.

[riget]

Re: Toshiba 40D1333B no back light.

yes q216

[cossiejay]

Re: Toshiba 40D1333B no back light.

do you have the part numbers please I have same fault only 0 volts going to leds

[ReeceyBurger123]

Re: Toshiba 40D1333B no back light.

Look at the mosfets lol they have the PN on them.

[michael dranfield]

Re: Toshiba 40D1333B no back light.

You see inside the panel there are two strips connected together in the middle by a plug and socket, look at the ones that have gone brown , there are dry Jointed, link each one together with a bit of wire.

[ReeceyBurger123]

Re: Toshiba 40D1333B no back light.

Michael he has no volts going to the Leds meaning that the driver is dead. If he has 24v going to them (not boosted) the Leds would be bad.

[michael dranfield]

Re: Toshiba 40D1333B no back light.

The driver is in the screen itself, there is a fuse on this board .