LG 86UK6570PUB 3 Red Blinks

[ChattFix]

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 silent

Here are the cables under my scope.

[Diah]

Here are the cables under my scope.

clean them.. the black spots . but be careful as they are dry now... this set have many issue resulted with LVDS cable... but you need to repair the LED BL... and check the 4 ribbon cable too from both side to clean them..

PFC from Main SoC stoped working because of error on LED BL.. so no signal go to T-CON. only VCC 12V will be on T-CON... this condition are the same when we testing the T-CON & Panel as standalone... EGB pattern will show.

MB cant captured .. because this action only need JTK Module from LG.
on MB you have eePROM and eMMC, the eePROM sending the start so you have Power ON ... and tthe rail of 13V will be provided to Panel T-CON via IC1100 ... so every things sound good..

this why i wrote don't Touch the MB unless you repair the LED BL

[ChattFix]

clean them.. the black spots . but be careful as they are dry now... this set have many issue resulted with LVDS cable... but you need to repair the LED BL... and check the 4 ribbon cable too from both side to clean them..

PFC from Main SoC stoped working because of error on LED BL.. so no signal go to T-CON. only VCC 12V will be on T-CON... this condition are the same when we testing the T-CON & Panel as standalone... EGB pattern will show.

MB cant captured .. because this action only need JTK Module from LG.
on MB you have eePROM and eMMC, the eePROM sending the start so you have Power ON ... and tthe rail of 13V will be provided to Panel T-CON via IC1100 ... so every things sound good..

this why i wrote don't Touch the MB unless you repair the LED BL

Okay so clean the copper pins, then replace the all of LED backlights correct?

[Diah]

Okay so clean the copper pins, then replace the all of LED backlights correct?

YES

[ChattFix]

YES

Should I pay the extra on ShopJimmy for quality or does it matter?

[EazyBone]

Just buy em on eBay. Shopjimmy takes them out of new tvs, so essentially all are used anyway. On eBay at least they are new and significantly cheaper. I've had better luck on eBay then shopjimmy TBH.

[Davi.p]

Oh my god... that's incredible..
1) i see what the user shows me, i saw 2 boards on picture, i thought it had only 2 boards also because of the 2 Twins lvds ribbons output, i cannot know every hundreds tv models in the world! User Diah must calm with its words, i have never hamed a tv.
2) It's fool to dismantle Cyclope's tv for the doubt of bad backlight, and i do not see any sign of that, much more safe and easy to do the test i have already said, 2 minutes test!
3) I have never seen in long hobbist career a tv set that enables tcon power but not tcon input data due to bad BL and no BL, that is nonsense words, some people lives only to be present on a forum and shots their s*itting everywhere..
4) Tcon auto test not called is a common fault and can depend, for me, by many reasons including bad tcon (most common), but in this case with no BL it belongs more to a bad main board case, so post a decent (much light) picture of tcon, i guess a Monster tv have power source directly from power board, this could explain why tcon is fed by power but without data, MB can turn on power but software doesn't provide data, 3 blinks spy led can tell standby software is working but not full software..
5) Power board has no clear feedback pin to MB for BL working state, so i guess software can't stop due to BL issues, there is a mistery pin MS that is more common back light activation (always present in every tv)

[Diah]

Oh my god... that's incredible..
2) It's fool to dismantle Cyclope's tv for the doubt of bad backlight, and i do not see any sign of that, much more safe and easy to do the test i have already said, 2 minutes test!)

the fool here who read and write with out understanding LG TVs Plat Forum,.. & the different between Analogue & Digital Circuit.
more doesn't worth to write..