Getting line 3x to 5x working on LG plasma TV

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  • February 14, 2020 at 5:37 PM #35442
    larwilliams
    Participant

    Hello,
    I have a LG 50PB4560B-UA plasma TV that I recently started using with my OSSC. It works fine with straight input and line 2x, but 3x to 5x give no video regardless of the system being used. I’ve tried the ideas at https://videogameperfection.com/forums/topic/tips-tweaks-lx3-lx4-lx5-modes/ to no avail.

    It claims to support the following:

    HDMI (PC) supported mode
    Resolution Horizontal
    Frequency (kHz)
    Vertical
    Frequency (Hz)
    720 x 400 31.469 70.08
    640 x 350 31.468 70.09
    640 x 480 31.469 59.94
    800 x 600 37.879 60.31
    1024 x 768 48.363 60.00
    1360 x 768 47.712 60.015
    1280 x 1024 63.981 60.02
    1920 x 1080 67.5 60.00

    HDMI (DTV) supported mode
    Resolution Horizontal
    Frequency (kHz)
    Vertical
    Frequency (Hz)
    720 x 480p
    31.47 59.94
    31.47 60.00
    1280 x 720p 44.96
    45.00
    59.94
    60.00
    1920 x 1080i 33.72
    33.75
    59.94
    60.00
    1920 x 1080p
    26.97
    27.00
    33.71
    33.75
    67.432
    67.50
    23.94
    24.00
    29.97
    30.00
    59.939
    60.00

    I’m assuming that I need to adjust the settings as per that thread to get it working, but I cannot seem to find the correct values despite the instructions there. Anyone else ever used this TV and found the values that work?

    February 20, 2020 at 4:51 AM #35601
    larwilliams
    Participant

    So I dig into this and 2 things were determined.
    1) My AV receiver was not doing a true pass through even when all scaling/conversion options were disabled
    2) When connected directly to the TV, 3x and 4x work but the resulting image is fairly dark regardless of the connected system. 5x doesn’t work, but I think the TV itself is the cause of that, as it doesn’t seem to support the needed input to handle what the OSSC is sending.

    For #2, running it through the HDMI input on the old generic $20 SCART to HDMI scaler that the OSSC was intended to replace seems to have resolved the brightness issue with 3x and 4x and brings no noticeable lag.

    Case closed: AV receiver and TV suck 🙂

    February 20, 2020 at 8:53 AM #35603
    Harrumph
    Participant

    Could be due to limited/full-range RGB mismatch. Make sure your TV is in PC mode.
    And just to note, if your TV is in limited range mode, the image will be brighter, but blown out and crushing blacks. So in that case the darkened picture is actually the correct one even if it appears duller to you. You should check correct colour/brightness with 240p test suite or equivalent.

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