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blkrx7
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Last Activity: 12-02-2020, 02:19 PM
Joined: 10-13-2019
Location: Toronto
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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    I really appreciate the help, thanks for all your time.

    The odds are very good I'll ruin this board if I try and use my hot-air station on it, I'm not very good with it. I'll wait until I have totally exhausted my patience

    If I do find an answer, I'll reply to the thread. I have a feeling it's something between HDMI 1/2 and the main processor (or have outright damaged the main processor via the surge).

    HDMI 3/4 seem to have a daughter processor handling them, which is probably why I can connect with my laptop...
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Laptop plugged back in, still nothing on the display, no voltage at usb.

    Laptop still reports back it's plugged into an LG display.
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Unplugged
    I removed pin 24 completely from p202, so it would not connect to power supply.
    Jumped 24/17 on the power supply
    Plugged in
    Turned on

    I have 24v at the tcon now
    No optic LED or anything on the display
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    See attached...
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Yep, I can bridge the P201 pins 24 (drv_on) & 17 (stby) and confirmed the power supply outputs 24v (tcon/mb unplugged from power supply).

    That signal is not getting sent from the mainboard.

    Would you like me to bridge it while it's connected to the mainboard/tcon?
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    1v

    202 unplugged
    Power supply output pin 0v
    Tcon power input pin 1v

    202 plugged
    Power supply output pin 1v
    Tcon power input pin 1v

    The 1v is coming from the tcon. May not be relevant but surprises me to see any voltage on that pin at all while it's unplugged.

    It's actually 1.336v, very strong, very consistent.
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Strange, usually I get 1v on the 24v rail (measured on power supply).

    When 202 is unplugged, I get 0v

    The fuse on the tcon (measured good) reads 1v on either side. I presumed it was the power supply sending that 1v, but it seems like it's being backfed somewhere on the tcon.
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Unplugged from wall
    Removed P202 from Power supply
    Plugged into wall
    Turned on
    Waited 1m

    No Optic LED light
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    IC4301
    IC4400
    1 -> 5v
    2 -> 0v
    3 -> 0v
    4 -> 3.3v
    5 -> 0v
    6 -> 0v


    IC2305
    15,16,17 -> 12v
    18 -> 0v

    These aren't easy to measure, if something looks way out, yell.
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    P2500
    24.56 on Pins 3, 4, 5, 6

    New IC's attached...
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Turned on
    0v on USB 1, 2, 3
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Sorry,

    TV was left on
    Removed plug
    Pressed and held 3000
    Plugged in
    Left 3000 down for 5 seconds
    Released

    Remains in standby, no other changes
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    No change.

    I've left the laptop plugged in HDMI 3, mirroring my desktop
    Unplugged the set, waited until the standby light went out
    Clicked power to ensure it was fully discharged
    Held down 3000, plugged in the plug, waited 10 seconds and let 3000 off
    Turned on the set, no picture, and the big side of the Power Supply still isn't active

    When I click the 3000 while the tv is in standby, the led on the front reacts slightly (flickers for a moment). The TV won't react to the RC for 2-3 seconds after...
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Interesting,

    HDMI 2 - ARC nothing happens. I've tried a Nintendo Switch, and Nvidia shield, neither detect anything plugged into them (tv on, or off) and the tv doesn't respond while in standby to turning on the devices.

    I plugged a laptop into 1/2, doesn't recognize anything plugged in.

    I plugged a laptop into 3/4, and it recognizes an "LG RVU Display" (TV still doesn't respond, no picture/sound), the laptop attempts to mirror the desktop at 1080p (old laptop, may be as high as it goes)
    ...
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound



    I can only easily measure the top of P1000, working at getting access to the bottom.

    Currently, I show 12v on:

    7, 9, 11, 13, 17, 19 (17-19 should be 3.5 no?)

    23 has 3.2v


    And HDMI 1/2, same pattern except higher voltages on 15/16, at 4.9v...
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    HDMI 4 and 3 have the same pattern in voltages:

    1 0
    2 0
    3 0
    4 0
    5 0
    6 0
    7 0
    8 0
    9 0
    10 0
    11 0
    12 0
    13 ~3.5
    14 0
    15 4.5
    16 4.5
    17 0
    18 0
    19 0

    Pins 2, 5,8,11,17 are grounded, both jacks
    See more | Go to post

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound



    Absolutely happy to.

    Two angles of the HDMI 3/4 area attached. A couple angles of 1/2 as well.

    Original files are stored in the link if you need higher resolution.

    Working on getting voltages off of the HDMI sockets now, will be in touch shortly....
    See more | Go to post
    Last edited by blkrx7; 09-25-2020, 11:39 AM.

    Leave a comment:

  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound



    Thanks so much, please see link:

    [url]https://1drv.ms/u/s!AkYvRKy_t0NMiYgYm_AlpSaZVdOwRQ?e=ReW7Un[/url]

    Board: EBT64292507
    Chassis: LJ6 or E#64B (Written in two places)

    Some service manuals included with photos in the link. Let me know if you'd like closeups of any one area.

    I have a multimeter, small oscilloscope, precision iron, hot-air-rework station on hand.

    I neglected to mention the surge came via the HDMI port, but don't recall which one. When...
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Thanks, I've tried every combination of usb drive and air mouse I have on hand in each port, no luck. The ports themselves are dead, no power so i'm not sure anything plugged into them will help. I did confirm both the mouse and drive are read correctly by another LG OLED I have here, so they work.

    There is an sw300 switch on the back of the main board, when clicked the tv goes into standby. sw100 nearby has no effect.

    I can't seem to find any mainboards for this locally at a price worth trying out, I may have to pack it...
    See more | Go to post

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  • blkrx7
    replied to LG 55B6P OLED No image/sound
    in Troubleshooting TVs and Video Sources
    Re: LG 55B6P OLED No image/sound

    Good afternoon,

    I re-confirmed that the wav file (power_only) does play correctly over the IR LED's and turns the set on (just testing the method), but I don't have any way to confirm the (in_stop) is successfully received, as there is no display or reaction from the set. I'm presuming I have the correct set of wav files, they were downloaded as a set.

    The optical audio port has no led lit in it (and I wondered about this) when it's turned on or off. There is also no power on the USB ports. But the main processor on the...
    See more | Go to post
    Last edited by blkrx7; 09-23-2020, 01:19 PM.

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