47 inch lg model 47lx6500 blacks out

[Diah]

Re: 47 inch lg model 47lx6500 blacks out

you can do it with your self too, took any Double IR Remote control and headphone jack and use those file, IN STOP are Hard reset, you need only this, after you play the wave in after 3 second put the code with LG remote yours are 04103 or 0000 after you put it and successful TV goes to Stand by, leave it 5 second then turn it on again,, this will make hard reset to software abd boot loop too.

you can see how with this video https://www.youtube.com/watch?v=9qtQLrjpO4c

sorry code are 0413 or 0000

[budm]

Re: 47 inch lg model 47lx6500 blacks out

YES- They are wired together and they all jump to around 135 vdc and jumps little higher and lower and then settles down to 115 vdc and holds steady. Its the same with backlights plugged in or out. There is a power diode that goes from 115 steady voltage to backlight ckt' and it is steady at all times. A couple of filter cap are there but they are good. There is a ckt. that goes from pos. side and think it might be shut down ckt. Don't know for sure. A schematic would be a big help. Any thoughts?

Are you talking about the V+?
1A/B/C (same for 2, 3, and 4) are the Cathode for the current return lines through the PWM control MOSFETs.
What do you get on all of those 12 pins?

[vinceroger69]

Re: 47 inch lg model 47lx6500 blacks out

Hi guys im working on this exact set, customer states watching tv backlight switched off.
so far i have stripped it down and removed lcd no visible burnt led (edge lit set 4 lots of leds) i have tested from v+ to each return wire on switch on all strips are the same about 131 volts. Whats odd the backlight has now turned on and stay on. I tried re booting the tv a few times what i have noticed though on boot up about 1/3 of screen leds top and bottom light up bright the other 2 thirds are lit but not as bright? then all of a sudden they go full brightness like the rest, could this be a power supply fault? drive on i presume is back light on which is 5 volts on every switch on (even if back lights fail it still is 5v) any help appreciated.

budm posted in post 12 this, so leds lighting like they do could this be normal on switch on?
This LG has this feature called LED Plus Technology:
From LG: LED Plus Technology
Tired of dark scenes or dull colors? LG's LED Plus technology provides even greater control of brightness through local dimming to deliver amazing clarity and color detail, as well as a more energy efficient TV compared to conventional TVs.
It has more than TWO LED strings, as you can see on the sub board, there are many PWM Controlled power MOSFETs for a bunch of LED strings to achieve local dimmimg.
budm also mentioned it has twelve strips it has (4 each strip has 3 sections)
link to psu used https://www.shopjimmy.com/lg-eay6080...ply-led-board/

[dskall]

Re: 47 inch lg model 47lx6500 blacks out

Poor connections between strips?

[vinceroger69]

Re: 47 inch lg model 47lx6500 blacks out

its a odd strip it probably has 30 leds on each strip (4 in set each on own heatsink) on the end of led strip is a connector with 4 wires on which then goes straight to the psu i will try and get a picture .
https://www.ebay.co.uk/itm/274739443...5c50%7Ciid%3A1

[vinceroger69]

Re: 47 inch lg model 47lx6500 blacks out

Just been looking at this tv again each led strip has 66 leds broken into 3 sections hence 4 wires per strip I have tested all the sections using a led tester all draw, same voltage and amps.I have found a cheap psu/led driver board on ebay so going too try a board swap if that solves the issue I will use new board to fault find the original I will update the thread when it's fitted
.

[vinceroger69]

Re: 47 inch lg model 47lx6500 blacks out

Just been looking at this tv again each led strip has 66 leds broken into 3 sections hence 4 wires per strip I have tested all the sections using a led tester all draw, same voltage and amps.I have found a cheap psu/led driver board on ebay so going too try a board swap if that solves the issue I will use new board to fault find the original I will update the thread when it's fitted
.

Just fitted the replacement power supply/led driver board the set seems to work ok now i have factory reset and retuned etc only thing i cant seem to get too work is anyrthing netcast based none of the apps work has netcast service ended now this set is a LG 47LX6900 2010