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TV powers on, LG logo and clock logo come on briefly, then no picture

TV powers on, LG logo and clock logo come on briefly, then no picture

LG 55LX6500 3D Model TV UB Build on the Main Board Images Below

Asked by: Guest | Views: 274
Total answers/comments: 5
bert [Entry]

"Hi,

As you are getting the logo I suggest that you try and see if you can reload the firmware into the TV. If you can't, you've only expended a bit more time, not money, on it at this stage.

Here is a link to the support page for your model. Scroll down to find the firmware install guide and firmware download links.

http://www.lg.com/us/support-product/lg-..."
bert [Entry]

"Reid Smith, at this point do not consider any baking, cooking or other culinary adventures. The first thing you want to do is post some good pictures of your boards, ""many small lights on the back that come on during power up when the screen has the LG logo, but go off after a second or two"". You want to turn your TV on in a darkened room and produce an image on the screen (either a known working station or a video/DVD ) then shine a flashlight at an angle against the display. See if you can make out any silhouettes. That would indicate that your backlight is not working. Of course you can also use a multimeter and measure the voltages coming from your power board. Again, if you post some good images, we might find more information for you. The symptoms you are describing suit a failed backlight/inverter circuit.

Update (01/03/2017)

Let's see if we can get your backlight to come on. Try to force the power board ON.

SMPS TEST 1: To Force Power Supply On.

Disconnect P8000 on Main board.

(A) Jump pins 9, 10, 11 or 12 (3.5V) to pin 1.

Test Voltage Outputs 12V, 24V to Main and 24V to the Inverter.

Remove AC power. Leave the jumper in place.

SMPS TEST 2: (B) Jump pins 9, 10, 11 or 12(3.5V) to pin 18 (INV-ON). Apply AC power, the Backlights should turn on. Let me know what you have when you do this."
bert [Entry]

"I have a LG 47 LX6500 had the exact same symptom. The TV worked & shut off properly but then this problem start at the next morning. I watched a few youtube videos pointed to one of LED light burned out and shorted so the LED power driver board detected voltage variation & shut off automatically. The burned LED must be replaced but there is too much work!

https://www.youtube.com/watch?v=hh3z_dkk...

https://www.youtube.com/watch?v=Bf5T2wwt..."
bert [Entry]

My TV had the same issue. I would turn it on and the logo would flash and then the tv would go black. If you wait about two minutes the tv goes dark and then lights up again. After it lights back up you can click input on your remote and it will start working again. Or at least that is what worked for me.
bert [Entry]

"I had the same issue for LG TV 60LB7100-UT

In my case, i replaced the power supply board (bought in eBay) and it is working fine now"