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Thread: LG TV wipeout

  1. #281
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    Quote Originally Posted by Skepticist View Post
    But the CPU was showing signs of life when a USB drive was plugged in?
    Having all the functions in a single package makes it almost impossible to faultfind in there. It does have a JTAG interface but probably needs 'secret' software to make use of it.

    You could probe the I2C tracks to the external devices like the tuner with a CRO for activity to get an idea of what's going on but it's a jungle in there.
    Yes the USB did something. It acted as if an update went through but of course I had no screen to prove that.
    I would seem the LGE chip is at least partially working, whether it's loss of connection or loss of a voltage line is questionable. I've already checked the voltages at some points and they do go all over the board but a more detailed look is required.
    Think I might try it in the oven since if the temperature is right, it shouldn't hurt it, and if that doesn't fix it I'll put it aside till the new hand held oscilloscope turns up.
    I've got another couple of TVs I want to get going too so I might look at them while I'm waiting.

    PS I think where a lot of people have failures with the oven or heatgun treatment is they neglect to use flux, no point resoldering a dry joint to make a dry joint.
    PSS If I could prove the GLE is faulty, I can get one for $25 balled up ready to solder.
    Last edited by loopyloo; 21-08-17 at 03:29 PM.



  • #282
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    The main danger with the oven approach is to the plastic in the connectors on the board so it's a balancing act between the points where the solder melts and the plastic melts. I was actually surprised that the plastic endured the 200C temp. The other way would be using a hot air gun but I can imagine a bunch of smd resistors and caps get blown out of place that way so it's oven or targeted IR lamp heating.

  • #283
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    The plastic seems to handle it easily as long you don't go over temp.
    The worse problem I found is a component underneath could fall off. lol
    Last edited by loopyloo; 21-08-17 at 04:33 PM.

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    I notice when the TV has been running for 10 or 15 minutes, the eMMC chip stays cold.
    Not too sure what it does but it's a multi media controller positioned near the USB slots so prob for that.
    I suppose it might stay cold if no USB is plugged in yet I wonder if it could influence IC105 to not operate properly if it's faulty.

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    eMMC is the 4GB flash memory chip - It would contain the firmware for the CPU, I presume an Android OS?

    IC8100 SDIN5D2-4G-974L1 Sandisk chip according to the pdf at least
    Last edited by Skepticist; 22-08-17 at 11:39 PM.

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    Quote Originally Posted by Skepticist View Post
    eMMC is the 4GB flash memory chip - It would contain the firmware for the CPU, I presume an Android OS?
    I believe it's called WebOs.
    So if it has the cpu firmware does that mean it's pre-programmed ?

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    Yes pre-programmed but re-writable as well for firmware updates which could come from USB drives or via the serial ports on the Engine chip
    It's directly connected to IC105
    Last edited by Skepticist; 22-08-17 at 11:45 PM.

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