Sceptre 48" TV backlight LED`s

[angelos]

When battling to repair a LED strip like you obviously are i would suggest using those loose led boards. The Chinese on Aliexpress like calling it "3V LED Beads"
We use a 1mm thick thermal adhesive strip and glue those boards on the backplate directly. To do this you remove the old back lights, reinstall the reflector sheet back in place so that with a thin marker you can draw the holes in the reflective paper onto the back plate so that you can mark the exact position where those led boards must be mounted. Then with thin wire you can recreate the circuit. I have had good success doing so. Unfortunately because of the limited thermal dissipation because those boards are narrow i also look for a way to reduce the LED current. Sometimes i do it on the board by removing a resistor and other times i make changes in service mode to reduce the led current. Reducing the LED current means the led board will run cooler thus your tv will last. I don't trust Chinese manufactured items. These guys cut corners. I know for a fact that they use and sell third rate components. The good stuff is sold to the TV manufacturers and the excrement is sold on Aliexpress.

[vinceroger69]

Ahh okay, I see now, odd model number.

At this point I see why your changing them that way, you should of just bought replacement single LEDs instead of trying to remove them.

I don't know what type you need or voltage but this kit probably has it. If you measure the LED you'll know, and what voltage you need

I believe they are measured as, 3030 is 3mm x 3mm and 2830 would be 2.8mm by 3.0mm

might help

https://a.aliexpress.com/_mqrMiRi

Thanks for that link i have ordered that kit as handy too have in stock.

[spirittoo]

Wellsir ... seeing how I have $51 invested in the strips that I can't return and $10 in the heat plate, I will try using them, I guess I should replace all the leds in the strips with the bad ones. I will see how that goes.

[spirittoo]

Wellsir ... I'm making progress. I got an electric cord from an vacuum that no longer works and hooked up the heat plate to it. I was a bit worried about powering it up so I took it outside to test it. It gets plenty hot went up to 450 degrees according to my heat gun. I screwed up with the first two leds ... I damage them, but I was able to figure out how to use it and I removed 18 leds. I tested them and they are all good. I was able to tell which is the positive side of the led and which is the negative. Tomorrow I plan to solder the working leds into the strips. With two strips hook together with each led at 3v each with a total of 12 that would make it 36V. I want to test the complete strips so I figure to use 4 9V battery, but can you tell me the correct way to hook them up. Should all the negatives be together and all the positive. Like a wire going to each negative terminal and a wire attached to each positive? Also any recommendations for soldering the leds in place?🤔

[nomoresonys]

Testing leds: https://www.youtube.com/watch?v=rNqRZ2qaDJY

[spirittoo]

Thanks for that link ... I got the leds replace, soldering was no easy task with my shaky hand. So I just replaced the bad ones. I'll be ready to reassemble it after the test.

[spirittoo]

Wellsir ... I failed completely ... I just could not get those little led soldered in properly. I have a piece of crap soldering iron. The solder just would not stick and I was burning up the led. To make matters worst the dang iron quit on me.🤬 Unfortunately I have to put this project on the back burner until after the holidays ... I have guest coming and I need to move the tv out of the guest room where I am working. Can any of you suggest a good soldering iron?🤔

[spirittoo]

Wellsir ... I decided to get this one

https://www.amazon.com/Weller-Digita..._hp_atf_m&th=1

[nomoresonys]

That price seems crazy high for a basic iron.

[vinceroger69]

Wellsir ... I failed completely ... I just could not get those little led soldered in properly. I have a piece of crap soldering iron. The solder just would not stick and I was burning up the led. To make matters worst the dang iron quit on me.🤬 Unfortunately I have to put this project on the back burner until after the holidays ... I have guest coming and I need to move the tv out of the guest room where I am working. Can any of you suggest a good soldering iron?🤔

Did you use the hot plate to remove the leds? i also use my hot plate to replace them just drop the new led on the pads and let strip cool down

[spirittoo]

That price seems crazy high for a basic iron.

That with a station was the cheapest I could find. The others with a station were $115.00 to $170.00🤑😱

[spirittoo]

Did you use the hot plate to remove the leds? i also use my hot plate to replace them just drop the new led on the pads and let strip cool down

That hot plate gets really hot. I'm afraid it will damage the led, and I would have to remove the strips from the TV. I feel more comfortable using a good soldering iron.😐

[nomoresonys]

That with a station was the cheapest I could find. The others with a station were $115.00 to $170.00🤑😱

Yep, your right, that's about right for that model weller.