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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.

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  • #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.

  • #284
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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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    Went around all of the drawings for IC105 and picked every voltage pin I could see.
    I ended up with a list of 39 points as close as I could get to the chip to check for 1.2v, 1.5v, 3.3v, 3.5v and 12v. All ok except for a couple I couldn't find.
    Also checked IC2400, IC2403 and IC2405 for 1.2v, 1.5v and 3.3v. All ok.

    Now I've got an aching back from leaning over it with a loupe for so long. lol

    I've got a panel from a 42" LG of similar era, I wonder what would happen if I plugged its ribbons into this t-con.
    Last edited by loopyloo; 23-08-17 at 06:32 PM.

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    The 47" one is 3D? Not sure the LCD ribbons are going to be identical but you never know - maybe do a bit of research first

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    Quote Originally Posted by Skepticist View Post
    The 47" one is 3D? Not sure the LCD ribbons are going to be identical but you never know - maybe do a bit of research first
    Yes it's got 3D capability. I think the 42" was too but I can't remember which model it was in.

    PS Can forget that idea...The ribbons on both are exactly 60mm apart but the ribbon widths are different. 31mm vs 1".
    Last edited by loopyloo; 23-08-17 at 08:48 PM.

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    Any chance the inputs to the TCON boards are the same? maybe that (keeping panel and TCON together) would avert any chance of damage due to panel ribbon variations between the 2. (just guessing here of course

    Did you bake the board yet?
    Last edited by Skepticist; 23-08-17 at 08:51 PM. Reason: typo

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    Silly question. Has the faulty TV got a video out that you can connect to another TV ?

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    The only direct outputs from the engine chip appear to be headphones, USB, optical audio, LAN and serial interfaces

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    Quote Originally Posted by Skepticist View Post
    Any chance the inputs to the TCON boards are the same? maybe that (keeping panel and TCON together) would avert any chance of damage due to panel ribbon variations between the 2. (just guessing here of course

    Did you bake the board yet?
    Yep, baked all bga's.
    As far as the T-con goes, The panel is only the actual panel (glass bit), I kept after removing the backlights for spares and chucking the rest, and I stupidly didn't think to keep the matching T-con board.

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    Regardless of the Engine Chip.
    Just a Video Out to see if it is screen or earlier.

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    Quote Originally Posted by Reschs View Post
    Silly question. Has the faulty TV got a video out that you can connect to another TV ?
    I wish it did, would make this exercise a little easier.

    4 HDMI in, 1 marked as ARC and 1 marked as PC.
    3 USB marked as USB apps, USB hub and HDD IN.
    1 VGA in.
    1 Component in (red grn blu).
    1 A/v in.
    1 standard audio in.
    1 Optical audio out.
    Last edited by loopyloo; 23-08-17 at 11:41 PM.

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    I'm going to order another engine for this.
    I think all the symptoms point to it being the fault.
    Could be fun removing the old and lining up the new before heating but I'm fairly confident I can do it.

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    I did look around for complete mainboards and found them way overpriced. Fingers crossed for a successful transplant
    It's a lot of extreme heat cycles for the rest of the board but maybe it will stand it.

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  • #299
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    Quote Originally Posted by Skepticist View Post
    I did look around for complete mainboards and found them way overpriced. Fingers crossed for a successful transplant
    It's a lot of extreme heat cycles for the rest of the board but maybe it will stand it.
    I'll keep the heat mostly local by placing a general purpose heat gun at a distance underneath and use my rework station heatgun directly on top of the chip.
    The oven will be the last resort.
    Last edited by loopyloo; 30-08-17 at 11:35 PM.

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    Looks like a Weekend project
    definitely do-able

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