Powering LEDs from a broken LED/LCD TV.

[jamesgang]

Hope this link works. I occasionally part out newer TVs that have had the screen broken. I decided I'd try to get a set of LED's to light up. Got 8 of these strips out of a 46" Samsung. I ramped up the voltage till I got pretty good illumination. Ended up with 48v and about 1/3 amp to do one st rip. In the picture I have a 10ohm resistor but it works without a current limiting resistor. I just had this one in the circuit so I could calculat e current. The mounting board seems to get warm so I suspect the current l imiting is built into the strip. I'm thinking about using these for some o utdoor lighting projects.

1975206785_n.jpg

[gregz]

Don't know about the limiting, but I like the variac. Used to use one that also had meters.

Greg

[hrhofmann]

screen broken. I decided I'd try to get a set of LED's to light up. Got 8 of these strips out of a 46" Samsung. I ramped up the voltage till I got pr etty good illumination. Ended up with 48v and about 1/3 amp to do one strip . In the picture I have a 10ohm resistor but it works without a current lim iting resistor. I just had this one in the circuit so I could calculate cur rent. The mounting board seems to get warm so I suspect the current limitin g is built into the strip. I'm thinking about using these for some outdoor lighting projects.

That sure looks like a Harbor Freight multimeter sitting there!!!!

[willshak]

Why? It's not a cen-tech multimeter which is HF's brand.

[Stormin Mormon]

Cen Tech typically have the leads on the lower right, front.

[Jon Danniken]

The case is similar, but the label says it's a "Windward Multimeter WP2000". I looked it up but I can't find a reference to anything by that name, or even by that company. Hmmm....

Jon

[krw]

You will probably want some current limiting in there for your project. You can't count on the line voltage being constant and the current will vary wildly depending on the voltage. You're unlikely to get an integral number of strips to work out to the right voltage, either.

[John Fields]

[jamesgang]

he screen broken. I decided I'd try to get a set of LED's to light up. Go t 8 of these strips out of a 46" Samsung. I ramped up the voltage till I g ot pretty good illumination. Ended up with 48v and about 1/3 amp to do one strip. In the picture I have a 10ohm resistor but it works without a curr ent limiting resistor. I just had this one in the circuit so I could calcu late current. The mounting board seems to get warm so I suspect the curren t limiting is built into the strip. I'm thinking about using these for som e outdoor lighting projects.

95_1975206785_n.jpg

I'm thinking I'll go with a 48v switching power supply. They are pretty ch eap on flea-bay. The tv power supply says the led voltage was 122 vdc. I guess two strips in series. The strips all connected to a distribution str ip running down the side, I should have checked that out closer but I threw it away with the tv plastic and wires. The led strip is actually 2 strips that connect about 2/3 of the way down. They are in series because it doe sn't light if you disconnect the second segment. I'm thinking they use dif ferent length 2nd sections for different size tv's. I got 8 sets of these out of this 46" tv.

[jamesgang]

he screen broken. I decided I'd try to get a set of LED's to light up. Go t 8 of these strips out of a 46" Samsung. I ramped up the voltage till I g ot pretty good illumination. Ended up with 48v and about 1/3 amp to do one strip. In the picture I have a 10ohm resistor but it works without a curr ent limiting resistor. I just had this one in the circuit so I could calcu late current. The mounting board seems to get warm so I suspect the curren t limiting is built into the strip. I'm thinking about using these for som e outdoor lighting projects.

95_1975206785_n.jpg

I can't really figure out why else the board would get warm. It's got pain t over it so I can't really trace anything on it. There are a few surface mount parts on it besides the leds but they are small so I can't see them b eing much of a current limit at a 1/3 of an amp. I cranked the voltage up into the 50s but it didn't get much brighter so I figure 48v is safe. I've run it at 48v for about 30 hours now.

[jamesgang]

the screen broken. I decided I'd try to get a set of LED's to light up. Got 8 of these strips out of a 46" Samsung. I ramped up the voltage till I got pretty good illumination. Ended up with 48v and about 1/3 amp to do o ne strip. In the picture I have a 10ohm resistor but it works without a cu rrent limiting resistor. I just had this one in the circuit so I could cal culate current. The mounting board seems to get warm so I suspect the curr ent limiting is built into the strip. I'm thinking about using these for s ome outdoor lighting projects.

8595_1975206785_n.jpg

int over it so I can't really trace anything on it. There are a few surfac e mount parts on it besides the leds but they are small so I can't see them being much of a current limit at a 1/3 of an amp. I cranked the voltage u p into the 50s but it didn't get much brighter so I figure 48v is safe. I' ve run it at 48v for about 30 hours now.

My $8, 10amp, 48vdc power supply showed up. Tried a strip on it with no re sistor. Seems to work fine.

[tuan.duy.ho]

e screen broken. I decided I'd try to get a set of LED's to light up. Got 8 of these strips out of a 46" Samsung. I ramped up the voltage till I go t pretty good illumination. Ended up with 48v and about 1/3 amp to do one strip. In the picture I have a 10ohm resistor but it works without a curre nt limiting resistor. I just had this one in the circuit so I could calcul ate current. The mounting board seems to get warm so I suspect the current limiting is built into the strip. I'm thinking about using these for some outdoor lighting projects.

5_1975206785_n.jpg

Hi there,

the link apparently no longer works and i was wondering if you can help me out, my son is trying to get the LED's from an old 46" samsung t.v. to ligh t up, but for some reason they are not. is it possible to light up just on e section or both must be put together? Also what kind of power supply do we need? 24 volts or 48 volts?

[Jerry.Tan]

can help me out, my son is trying to get the LED's from an old 46" samsung t.v. to light up, but for some reason they are not. is it possible to light up just one section or both must be put together? Also what kind of power supply do we need? 24 volts or 48 volts?

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You'll probably get more help on the newsgroup sci.electronics.basics or any of the other "sci.electronics.______ newsgroups. Those NGs are fairly active and there are some knowledgable people there. I like to tinker with electronics myself, but I cant answer your question. However, if you could find a schematic for that TV, it would likely show you the needed voltage.