# Toshiba 40l1333b (SSL400_05DA) - backlight problem

#### oldmazda

Joined May 18, 2020
11
I have the problem with backlights as only half come on and the voltage showing is 62v to the led strips. I have tried to get the links showing in the thread here https://forum.allaboutcircuits.com/threads/toshiba-40l1333b-ssl400_05da-backlight-problem.153775/ But keeps coming up with error messsage, I feel if i had the viltages infomation which will be in these links i stand a chanceif i knew the output voltages on the components so i can check if any are faulty , So if anyone has the info on this driver board same as in picture, i would appreciate the help.Thankyou for reading this

#### R!f@@

Joined Apr 2, 2009
9,734
Welcome to AAC.

Before that, are you sure the LED strip does not have broken LED/s?

#### R!f@@

Joined Apr 2, 2009
9,734
That older link is working.
That OP did not have a driver issue.
His issue was bad LED strip interconnects.

U can even check the LED strips separately. But you need to dismantle the whole LCD assembly.

#### oldmazda

Joined May 18, 2020
11
Welcome to AAC.

Before that, are you sure the LED strip does not have broken LED/s?
I have checked for continuity in the green strip the led strips connect to and also all leds all ok when i checked voltage from the driver board to the green led strip it is only 62 v and feel it should be more, So i feel something wrong on the driver board.As when plugged in only half of them light up thnx

#### R!f@@

Joined Apr 2, 2009
9,734
Green LED ??

#### oldmazda

Joined May 18, 2020
11
That older link is working.
That OP did not have a driver issue.
His issue was bad LED strip interconnects.

U can even check the LED strips separately. But you need to dismantle the whole LCD assembly.
The link i put on does work but the links that was put on that link dont as follows.
Here is a number of photos with varying test results
-----------------------------------------------------------
correct voltages on SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/151120-IMG_20151120_221823.v2-1.black text.png

results of testing original SSL400_05DA (from the tv)
http://testing.dfear.co.uk/toshiba_40l1333b/151120-IMG_20151120_221823.v2-1.black text.original board - test results.png

results of testing replacement SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/151120-IMG_20151120_221823.v2-1.black text.replacement board - test results.png

results of testing SN358, TR10E and CN001 - original SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/original - ic results.png

results of testing SN358, TR10E and CN001 - replacement SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/replacement - ic results.png

#### oldmazda

Joined May 18, 2020
11
Green LED ??
Sorry should of said Green strip the leds connect to

#### R!f@@

Joined Apr 2, 2009
9,734
The link i put on does work but the links that was put on that link dont as follows.
Here is a number of photos with varying test results
-----------------------------------------------------------
correct voltages on SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/151120-IMG_20151120_221823.v2-1.black text.png

results of testing original SSL400_05DA (from the tv)
http://testing.dfear.co.uk/toshiba_40l1333b/151120-IMG_20151120_221823.v2-1.black text.original board - test results.png

results of testing replacement SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/151120-IMG_20151120_221823.v2-1.black text.replacement board - test results.png

results of testing SN358, TR10E and CN001 - original SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/original - ic results.png

results of testing SN358, TR10E and CN001 - replacement SSL400_05DA
http://testing.dfear.co.uk/toshiba_40l1333b/replacement - ic results.png

Ur links are down.

#### R!f@@

Joined Apr 2, 2009
9,734
Show me ur LED strips

#### oldmazda

Joined May 18, 2020
11
How can i rectify the problem with links down as i dont understand

#### oldmazda

Joined May 18, 2020
11
Show me ur LED strips
Please disregard the tape and markings on the tv back

#### R!f@@

Joined Apr 2, 2009
9,734
OK...
Then explain the image.

#### R!f@@

Joined Apr 2, 2009
9,734
What are those "X" signs ?
Is it powered ?
Are some strips not working ?

#### oldmazda

Joined May 18, 2020
11
What are those "X" signs ?
Is it powered ?
Are some strips not working ?
The ones marked with x did not light up and still dont now . the second row rom top does not light up at all But at first all lit up till they went off

#### oldmazda

Joined May 18, 2020
11
The ones marked with x did not light up and still don`t now . the second row rom top does not light up at all But at first all lit up till they went off
Yes it is powered up

#### R!f@@

Joined Apr 2, 2009
9,734
Look at the green PCB strip and check if all the LED strips are connected in parallel or in series parallel combination

#### R!f@@

Joined Apr 2, 2009
9,734
I do not think you have a drive issue, but rather dead LEDs

#### R!f@@

Joined Apr 2, 2009
9,734
You can check the LED's one by one with a good DMM in diode check mode.
I always do that to identify dead LED's. Then I just replace them with exact replacement no.

#### oldmazda

Joined May 18, 2020
11
All the strips are in correct position. What i will do is check em 1 at a time and correct any not working and also redo all connections and check a strip at a time with 24v also check the continuance on green strip .Then come back on here with results. The question i have now is (A).How can i get them links up and what is the voltage the driver board should show to the green strip when powered up . I would love to see these links Thanx

#### R!f@@

Joined Apr 2, 2009
9,734
Do not apply voltage to things you have no idea about.
U will probably blow the LED's.
60V is nominal for those strips but they are distributed and current limited.

Just check the LED's of the dead strips one by one. Use a 5V source with series 330Ω or 470Ω resistor to check each LED separately.
I use my CC PSU to test each strip separately and then check the LED with DMM.

You apply power to those LED's without current limit, you will blow them.