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LG 55LF 5800 no video,no sound or backlight

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  • waybel
    replied
    Originally posted by Davi.p View Post
    You mean main board?
    Yes

    Leave a comment:


  • Davi.p
    replied
    You mean main board?

    Leave a comment:


  • nomoresonys
    replied
    Thanks for the update.

    Leave a comment:


  • waybel
    replied
    Originally posted by nomoresonys View Post
    This one may take a while, with a week in between tests.
    You are correct.With the risk of doing more damage than good after installing new LED lights i bought a $40 board and installed it and the tv works fine.Thanks to all

    Leave a comment:


  • nomoresonys
    replied
    This one may take a while, with a week in between tests.

    Leave a comment:


  • Diah
    replied
    PIN 4 follow the rail it will goes to the top of the boards and there will be R this R lift one side of it.. 3.3V you have on MB the first DC to DC circuit close to socket which it connect to PSU

    Leave a comment:


  • waybel
    replied
    Originally posted by waybel View Post
    ok
    Where would be a good spot to disconnect pin 4 on the pictures i sent and then where do i get 3.5 volt feed?

    Leave a comment:


  • Diah
    replied
    Originally posted by waybel View Post

    Are we still going to try this?
    ob to you... but you need to read all posts from my '#54 to #57.. MICOM DIY an easy matter as its intended circuit in -- out regards it firmware.. disconnection rail from Chip we can fed it alternative.

    Leave a comment:


  • waybel
    replied
    Originally posted by Diah View Post

    yes, but if you follow the pin 4 rail you will finnd easy point to separated the pin. post clear photo on the area of the PIN 4 rail.. we dont want you harm the MICOM chip
    Are we still going to try this?

    Leave a comment:


  • nomoresonys
    replied
    Originally posted by Storyteller12 View Post
    A reflow on this chip will not work. These boards need the processor replaced.
    I believe Nicks TV has done a yt video on these models and the processor problems.
    Well that's a new one on me but if Nick said so then I don't doubt it at all.

    Leave a comment:


  • lotas
    replied
    Most likely a new modification (improvement, modification, with new software...), since the old ones are no longer produced, the difference is one, this is also yours...
    https://www.shopjimmy.com/lg-ebt6383...fdGG9wttWjRHAU

    Leave a comment:


  • waybel
    replied
    Originally posted by lotas View Post


    EAXxxxxxx is the PCB number, different models are assembled on it, look for a paper tag with the number EBTxxxxxx, this will be for your model.
    Ok well then i guess LG changed the number from the old board or someone changed this board.This board is a EBT63838801 and the LG site says the correct board is a EBT63838802.Is it possible that more than 1 board will work?

    Leave a comment:


  • lotas
    replied
    Originally posted by waybel View Post
    Could someone tell me what main board will fit this tv.The one that is in it reads EAX65610207 EBT63774501 .The LG site says it should be EBT63838802 .Another site said EAX65610206 Some of these boards are dirt cheap but i don't want to buy one then it doesn't work.Why do i have to keep putting the image verification every time i ask a question on here?

    EAXxxxxxx is the PCB number, different models are assembled on it, look for a paper tag with the number EBTxxxxxx, this will be for your model.

    Leave a comment:


  • waybel
    replied
    Could someone tell me what main board will fit this tv.The one that is in it reads EAX65610207 EBT63774501 .The LG site says it should be EBT63838802 .Another site said EAX65610206 Some of these boards are dirt cheap but i don't want to buy one then it doesn't work.Why do i have to keep putting the image verification every time i ask a question on here?

    Leave a comment:


  • waybel
    replied
    Originally posted by nomoresonys View Post
    Heating the bga with hairdryer doesn't always get test results so it's not greatly reliable. A diy reflow done PROPERLY shouldn't hurt at all, It's a different process and is not done with a hairdryer: A diy reflow, involves getting the solder under the chip melted so it can reattach to the chip. Pretty straight forward, there's some good how to videos on youtube. Must be careful not to overheat or it will kill the chip, not enough heat and nothing bad will happen, it just won't work is all. They recommend gradual heating then gradually take heat away so as not to thermal shock the chip. Using a temperature gauge would be advised. Need to be extra careful not to blow away or lose any of those little components nearby such as those pesky little mlc caps. Here's a rough idea of the procedure using minimal tools. If one must use a heatgun be very careful with the temps, a lot of them were not meant for the lower temps needed for this kind of work, hot air stations are a much better tool for the job.
    I used a hot air station but no luck

    Leave a comment:


  • Storyteller12
    replied
    A reflow on this chip will not work. These boards need the processor replaced.
    I believe Nicks TV has done a yt video on these models and the processor problems.

    Leave a comment:


  • nomoresonys
    replied
    Basically a diy reflow done correctly does no harm, so I do it after doing all the usual
    mainboard tests for shorts and voltage etc. and if find no other obvious problems with the board.

    Leave a comment:


  • nomoresonys
    replied
    Example here on a graphics chip, same principal: https://www.youtube.com/watch?v=FU84qGSdE-s

    Leave a comment:


  • nomoresonys
    replied
    Heating the bga with hairdryer doesn't always get test results so it's not greatly reliable. A diy reflow done PROPERLY shouldn't hurt at all, It's a different process and is not done with a hairdryer: A diy reflow, involves getting the solder under the chip melted so it can reattach to the chip. Pretty straight forward, there's some good how to videos on youtube. Must be careful not to overheat or it will kill the chip, not enough heat and nothing bad will happen, it just won't work is all. They recommend gradual heating then gradually take heat away so as not to thermal shock the chip. Using a temperature gauge would be advised. Need to be extra careful not to blow away or lose any of those little components nearby such as those pesky little mlc caps. Here's a rough idea of the procedure using minimal tools. If one must use a heatgun be very careful with the temps, a lot of them were not meant for the lower temps needed for this kind of work, hot air stations are a much better tool for the job.

    Leave a comment:


  • waybel
    replied
    ok

    Leave a comment:

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