Re: Samsung UN32F5500 smart TV no backlight

i started with one open LED i fixed it by bypassing with 5 diodes. I week later it blew a whole bunch short circuited. I have a feeling after one goes the whole damn thing goes to shit, but I'm hoping not.

when you find the one blown I would highly recommend putting about 20 diodes in series to limit the voltage strain on the LEDs. I am currently running mine with 12 LEDs burnt out and it's still lots bright (limited the current with resistors).

P.S. it's not that hard getting at the LEDs, just use a few butter...

Re: Samsung UN32F5500 smart TV no backlight

the only pins that power anything are 1+(power), 4-(controlled ground). So the scheme does work it just seems confusing at first.

I say "controlled ground" because it is actually the ground that is switched on and off to control the backlight.

Re: Samsung UN32F5500 smart TV no backlight

okay. i'll try and clear this up. The power supply puts out the full voltage of 160V on 1+, it goes out to string 1, then comes back on 1-, then on the PCB 1- and 2+ are connected together. (Flip over the board and you can see the trace). Then from 2+ to 2- it goes through string 2, 3+ to 3- goes through string 3. Then it gets a little weird. 4+ goes through string 4 then without coming back to the PCB it goes through string 5, then comes back to 4-.

1+ >> string1 >> 1- =[PCB]= 2+ >> string2 >> 2- =[PCB]=...

Re: Samsung UN32F5500 smart TV no backlight

there are 5 strips not 4.

they are all in series, but 4 and 5 are connected in series inside the panel. So when you test +4 -4, you are actually testing 18 LEDs not 9 LEDs like the other ones. You would have to give it 40 volts probably to get them to light up.

Re: Samsung UN32F5500 LED TV Backlight issue

well i can't find the spec for these things anywhere... they don't look like the standard samsung 3535 or the 5630.. so i started doing some testing.

from what i can tell the whole backlight system on this tv (UN32F5500) is poorly designed. From testing I can tell each LED is meant to run at 2.9V.. 3.1V if you really push them, but that is not what is happening. They feed 45 LED's 160V, doing the math that comes out to 3.55V. So it is little wonder why they fail.

I'm only new to this tv repair stuff so maybe...

Re: Samsung UN32F5500 LED TV Backlight issue

did you order a whole strip and if where? does anyone have the part number for the individual LEDs on this model?

Re: Samsung UN32F5500 with bad LEDs

awesome post. after replacing my t-con board for no reason, testing/frying/fixing my inverter board, i found this post. cracked open and sure enough one stupid LED was all that was wrong. Replaced it with 5 series diodes and away she went. Not bad for a $30 tv off kijiji and oh ya 10 hours labor lol

Re: New Members - please post your introductions here

just a guy in this world.. looking to fix my tv.. miss the rom102 days if ya know what i mean