Toshiba 50L4353D With 5 Bad Leds !

[ReeceyBurger123]

I have this 50" Toshiba Smart Led Tv here and its not a Vestel ! It would turn on but no backlight. Lcd is working fine and can be seen using a torch. Anyway after diagnosing that the Panel (LC500DUE SF R1) had a bad Led inside it I took it apart.

After doing a bit of testing on the Led strips, I was able to find that this set had 5 bad Leds in total all in different parts of the Led backlight ! There was 4 O/C and 1 that was S/C really odd to me as normally only one needs to pop and they will all go, so I dont know how it ran with this many bad ones because I know they didn't all fail at once.

Anyway I did the stacking method for repair and used thermal plaster to mount the new stacked Leds, now the set works fine as you can see in the image:

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

After repairing any Led backlight I always set the brightness to the lowest I personally feel it can go before the Tv just looks crap. I set it to 15 it orginally was at 100 which is why the Leds burnt up so fast. Anyway working good now and it actually sold before I had repaired it lol

[martino]

Re: Toshiba 50L4353D With 5 Bad Leds !

nice! I have to do a 55" samsung,led's are in side strip 100 led's on each side. right side bottom 50 don't light up.
Any tips on handling the lcd panel when you lift it out of the frame? 55" seems wobbly to say the least.

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

Cheers Also wow 55" thats going to be fun to do lol, I did this between two beds. I took the Tv apart on my moms double bed and put the Lcd screen after removing it very carefully and rested it on my single bed. It is very fragile and flexible and carrying it was scary as it wobbles about haha.

The part you need to be most careful in doing is removing it out the frame and then finding a way to pick it up and move it safely IMO. Also with the tabbond driver boards you can use low stick electric tape and fold them over and stick them to the Lcd glass lightly this stops them going all over the place and getting damaged.

Also is it edge lit the one you have ?

[martino]

Re: Toshiba 50L4353D With 5 Bad Leds !

yes,edge lit. I would cry if I break the panel.Almost need 3 pairs of hands

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

Yeah I have long arms and big hands lol and im quite careful as well so I manage fine. But I would say get someone else to very carefully help you

Edge lit are also ALOT harder to take apart and replace the Leds but not impossible, you will need a good day or two to get it fixed I would say.

[flocko]

Re: Toshiba 50L4353D With 5 Bad Leds !

Use a large sheet of thick brown rapping paper and slide it in under the LCD starting from the opposite end from the tabs. then get someone to help lift using papper like a stretcher to support LCD. have done up to70" LCDs this way

[martino]

Re: Toshiba 50L4353D With 5 Bad Leds !

Thats a very good idea!

[flocko]

Re: Toshiba 50L4353D With 5 Bad Leds !

Yes They do say that ! also wear white cotton type gloves when working on set to stop putting print marks on everything

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

What about a 180" Led Tv Lcd screen ?

[dick_barton]

Re: Toshiba 50L4353D With 5 Bad Leds !

Hello flocko,
That's what I like with this forum. Some really good ideas.

[flocko]

Re: Toshiba 50L4353D With 5 Bad Leds !

Would not get that in the back of my explorer? and Reecey I dont think it would fit on your Mums bed or through the street door

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

Haha

[vinceroger69]

Re: Toshiba 50L4353D With 5 Bad Leds !

Nice fix reece, its a pity that the bush edge light ive fixed (bad eeprom) has no option at all to alter backlights level ive just tried in advanced too and no setting to alter it.

[flocko]

Re: Toshiba 50L4353D With 5 Bad Leds !

What power board does it use? If its the s 17IPS20 change the resistor on the LED string driver IC

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

What power board does it use? If its the s 17IPS20 change the resistor on the LED string driver IC

Its not a Vestel but UMC and you cant adjust the Bl on them but I dont thk they push them as hard tbh

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

Nice fix reece, its a pity that the bush edge light ive fixed (bad eeprom) has no option at all to alter backlights level ive just tried in advanced too and no setting to alter it.

Cheers bud Also you might be able to find a way of playing about with the driver to turn down the Bl I would be willing to help if you do. Also they use some cheap Leds in them screens they seem to last longer than Ves or Lg etc strangely.

[flocko]

Re: Toshiba 50L4353D With 5 Bad Leds !

Most String drivers ICs use current-setting resistor just look up data. most run max 200Ma Vestel 17IPS19 + 17IPS20 use the MP3394S four string drivers IC that are also a common problem with them

[ReeceyBurger123]

Re: Toshiba 50L4353D With 5 Bad Leds !

Maybe give it a shot Vince as a project ?

[vinceroger69]

Re: Toshiba 50L4353D With 5 Bad Leds !

Just checked my old thread its a megmeet MP4618 psu these use so not sure what can be done too it this is my thread budm posted a shopjimmy image of both sides of the board in post 9 thanks guys
https://www.badcaps.net/forum/search...archid=6030681