Hey Everyone, I have an LG 86UK6570PUB that wont turn on. Power light blinks 3 times. Tested voltage from power supply to main board and it is sending the correct voltage. When testing LEDs I have 1st strip at 210v 20mA, 2nd strip goes from 208v 20mA to 214 40mA. I'm assuming the LED strips is the issue. Anyone seen this before or can point me to something else to check?
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3 red blinks isn't a error code, this happens every time you turn an LG on.
Plug everything back up turn TV on and take a flashlight to the screen to see if there is picture. If yes then likely LEDs (where you are). Based on your test I would say yes the LEDs are bad. Led tester should bring it to a voltage and be steady around .4v on the tester. Since you are fluctuating on one, then likely yes that's the problem. I would change the LEDs. I test with the tester a few times since human error can occur and you may be messing it up when testing..
But make sure you try the flashlight test to make sure picture is totally fine just for assurance purposes.
Change the LEDs likely -
Which is your led tester type? Are you setting the Amp? Power board name? Trick it to turn on the lights without main b.Comment
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It looks as though the screen is going through multiple different colors or screens. No image appears but it seems like the screen is flashing different colors almost. Here are some pictures as well as the voltage change. It seems like they both do the same thing.Attached FilesComment
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Unplug led connector turn on tv, then use led connector on the working led side and try and see actually what's happening. Try and get the led tester fixed so you can move the screen and don't have to hold the probes at the same time. Could be damaged screen.
This is exactly why I said do the flashlight test first in this rare occurrence that's screen is damaged and you don't waste your time. Try and take a picture or video of it unless you already know that it's a damage screenComment
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How can be the same symptom without the main board? How do you trick the PB? I think in this strange power connector MS is the new style of BL_ON, so you can take a zener diode around 3v and put it with cathode to MS and anode to gnd, then a 2k2 resistor from 13v to MS then a wire from MS to PWR-ON, check if the lights comes on.. ensure the zener almost and well solderedComment
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RGB Pattern shown on the Screen, you have one of the LVDS contact pins shorted or damage.. inspect them from both sideComment
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my first suspicion is bad main software..Comment
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Don't hope of a simple fix, it can't be a matter of cables, here the tcon is part of the main board, a bad connection would provoke no video at all mostly..Comment
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No the main ic is a microprocessor, the main software is contained usually in an emmc, but good if you make the backlight trick before, even if i haven't ever read about LG with protection mode for faulty backlight.. bad software issue can easily be mismatched with bga issues, and LG is the king of bga issues, serial port debug can reveal some more..Comment
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Davi.p I have the FT232RL that I use to read error codes through UART, can I use this to connect the RX and TX? If so, what program do I use to grab the codes?Comment
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usually is very easy to locate serial port on a main board, 4 pin connector, usually not populated, one pin clearly on gnd plane, a side 5v output (not used if not needed), central TX,RX, use a random serial terminal sw, hyperteminal, etc..Comment
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basically, if you find a log error, example a file not found, error in file, and partition failed to mount, always same error, then software error and stop, if the errors vaires , then failing BGA...Comment
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Dont Touch the Mainboards... there are wrong info written from one user.. this set. are ONE SoC. there are no T-CON on MB... it had separted T-CON.. LVDS damage make the panel in test pattern.
show me the 2 LVDS contact Pins from both side.. don't trust your glasses..
if some one never had this set under his hand should keep silentComment
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Hello I have TCL 65S4 and it has no backlight, seems common problem on this tv to have bad LED's. I have no tester though I thought I could just test each LED with 2xAA batteries for 3v but it doesnt light up at all?
I saw a vid with LED tester on this TV and it had 130v for 1 good line which is 24 LEDs does that mean it needs around 5.5v per LED? -
I got the TV from a friend. He claims that no image but sound from the TV.
I confirmed that when shine a flashlight on to the screen, I can see the image. And this should be backlight problem.
I open up the TV and found a few leds failed. And now I am ordering a new set of backlight strips for it.
But there is something that I do not understand when checking the leds. I do not have an led tester. I only use a bench power supply. I first set the voltage to 3V and current to 10mA. I could not light up the led until I increase the voltage to 12V. I understand most... -
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I'm having an issue for several weeks with my quite old K70 LUX RGB keyboard. I haven't used it for few months, and once I setup up again my desktop computer, I got several dead LEDs on that keyboard. I tried the Corsair troubleshooting thing (disabling options in iCUE, ...) but nothing changed so I conclude that for some reason some LEDs went in retirement...😅
Decision taken to change these LEDs as I have access to desoldering iron and binocular magnifier, I wrote a ticket to tech support, hopping to obtain the LEDs reference and... They refused to tell me 🙄...10-08-2024, 11:58 AM -
Hi There!
I'm trying to help my friend who owns a restaurant be just bought.
He has a very long LED strip running along all the walls and columns. The strip is attached facing down 2in above the floor, using a wall panel that ends in a metal rail that finishes the panel underneath
It's stuck using, I guess, the 2 sided tape that comes with the strip
The issue is that like 1/2 of the full length, including 1/2 one wall, another entire wall, and one column, flickers after 4 or 5 minutes ON. Particularly it flashes staying OFF most of the time and flashing ON for 1 tenth... -
This set has the known reputation of failed led backlights. The set does not turn on, but when plugged in, the power led stays lit for about 5 seconds followed by two short blinks and then it repeats itself. While shinning a flashlight on the screen, you can make out the Sharp logo, then it goes out and repeats the cycle. I measured some voltages across the led backlight connector. What has me puzzled is that when I place the negative lead of my vom on the led backlight pin connector (in which the black wire going to the leds was), I measure as high as -228volts, and then it falls to -95 volts...
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