Re: Sourcing replacement backlight SMD LEDs or Strips (LG panel)
I had naively thought that the LEDs might be generic or easy to find. This is definitely not the case. My advice for anyone else looking for backlight LEDs chips is to contact 'lelos2' on the most popular auction site. He has been exceptionally helpful and is building a database of LED part compatibility.
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Re: Sourcing replacement backlight SMD LEDs or Strips (LG panel)
So I found the LEDs are coded with a 4 digit number which represents the x,y dimensions in tenths of mm. For instance there is 3528 which is 3.5mm x 2.8mm.
Mine are 3.0mm square so I'm looking for 3030 SMD. This doesn't seem very common and none of these parts have the domed lenses that the original strip has.
I guess the LEDs for the LG panel would have been manufactured by "LG Innotek" so I will see if there is a parts division I can email.
These are the most similar I found so far.
Any ideas anyone? I'd also be interested to know how much it is likely to matter to get the exact same brightness and colour.
HP's spec for the monitor says "Default color temperature 6500 K". Could I assume this is the correct colour for the LEDs?
thanks!Leave a comment:
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Sourcing replacement backlight SMD LEDs or Strips (LG panel)
Hi. I would like to gather advice about sourcing replacement SMD LEDs and/or LED backlight strip PCBs. As this is a general issue I thought we can have have a new thread.
As you will see here, I have an HP ZR2740W 27" IPS monitor for which I need to repair or replace one of the backlight strips. The panel is made by LG. I cannot work out how to find replacements.
I know the electrical characteristics, physical dimensions and details of the panel. I need to identify the correct replacements and find a supplier who will sell in a low qty (say 10) and ship to UK.
The specs for the LEDs I need to find:
Panel:
Mfr: LG
Panel Model: LM270WQ1-SDDA
Backlight:
Configuration: 2 strip PCBs each with 3 electrical strips of 12 LEDs. 35.5V each.
Part number on PCB "SUNG WEI 20V0", "LM270WQ1 *RIGHT* WR (100223 MB27083U rev B)"
LED chips:
Fwd Current: 310-330mA
Voltage: 3V
Power: Approx 1W
Size: 3mm square
Lens: hemispherical domed yellow lens
Package: 4 pin SMD, only 2 pins used.
Obviously they also need to be the same colour and luminosity but I can't see specs for these. Is there at least a standard colour temp used?
I have attached pics showing the LEDs next to a ruler. The one I have damaged (during disassembly) shows the electrical pinout.
thanks in advance!Attached Files -
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Failure Symptom
No picture, just red vertical stripes. Google search shows quite common problem for these recent Vizio M series although red vertical stripe pattern may differ. Some call it "Netflix" boot screen haha.
Where is the short?
Panel has 4x buffer boards. Quickly found the 1/4 panel buffer board with the problem by selectively disconnecting buffer board flex cables.
Having recently fixed another Vizio with similar symptoms that was a shorted ESD diode array ( link ) Probed the ESD diode array but... -
So... I have the patchy back light issue with my Visio M70, meaning some light up, others do not. I finally got around to testing the LED driver board and found that was not the issue (swapped another one in and the same issue persisted) and I am considering if i dare dive deeper into this TV and go after the LED strips.
Right away i see that they don't seem to stock them anywhere out there (E700DLB0016-002) is a part number that i see a you tube / seller guy list out. He has a nice video of how to get into my exact TV out there: https://www.youtube.com/watch?v=0AcUPiN83Tg
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Thanks for offering your assistance with this. I'm an electronics enthusiast with moderate level of competence (have a decent lab with two power supplies, microscope, DSO, hot air, good iron, can competently work at a component level on SMDs, design and solder own PCBs etc). I really enjoying fixing things and learning new stuff so took up a free 58" LED TV and have been googling and watching Youtube videos to see if I can fix this! I am happy to go down to individual component replacement/strip replacement etc - it's all in the name of learning.
The issues are as follows: the... -
I have 2: 75UK6190 units. One has a broken panel - it lights up and shows a bit of graphics. The other LG tv lights up but has no video. Turns on/off ok, and I swapped all the boards to check them all. I exposed the strips on the bottom of both panels. I tested the caps along the LED strips on the bottom of the panel. About 12 smd cap chips on the tv with no video, test shorted. I talked to LG tech support but they do not repair to this level, they just replace the panel. Now, there is a Philips mainboard that a smd capacitor chip shorts and causes a squeal from the power supply, and the fix is... -
Hi I am having an issue with the LED backlight of this TV. I can see the picture with a flash light, so I determined it was a backlight issue.
Initially, after opening it I found 2 shorted and 1 open LED on 2 strips (total of 4). I removed the LEDs and shorted the pads together to verify if the backlight would work.
Testing it, I found the backlight turned on and I measured 54V when TV was in standby (off), and 100v when TV was turned on. The 4 strips each contain 9 LEDs, so 36 in all minus 3.
Instead of putting it back together I decided to replace...
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