C64/C128 S-Video Bypass/RF Replacement – diagonal interference lines

NewHome Forums C64 & ZX Spectrum Video Enhancement C64/C128 S-Video Bypass/RF Replacement – diagonal interference lines

Viewing 10 posts - 1 through 10 (of 10 total)
  • Author
    Posts
  • #49230
    Andreas34346
    Participant

    I received my “C64/C128 S-Video Bypass/RF Replacement – DIY Kit” and installed it in my C64 longboard (ASSY 250425) correctly. According to manual I closed JPLUM1 and also soldered the ground cable as shown in manual.
    I have connected my C64 as usual with RetroTINK 2X (Model 3.2 Rev. B) with my monitor.
    The picture now is even worse then before!
    I get diagonal interference lines all over the screen (direction from top left to bottom right) and they are moving over the screen.
    I checked again with an unmodified C64 with RF-modulator, no interference lines at all.
    Also the voltage regulator on the RF replacment board gets really hot after a short time.

    I made some videos and pictures with my mobile phone, but the video and pictures do not really show clearly the problem. I took two still pics from the video and got one picture, where the problem could shown almost.
    I made a seond version of the three pics with Photoshop, where I marked the diagonal interference lines in red.

    Since pictures are so big, I will send them by wetransfer.com (see following link to download).

    https://we.tl/t-QoDOyjKTfK

    Anyone here who can help me please?

    Kind regards,
    Andreas34346

    #49239
    BuckoA51
    Keymaster

    It does look a lot like some kind of powerline interference, can you try a different aftermarket PSU? I know some people say that the Electroware one can do this.

    Can we also get some pictures of your installation?

    Use PNG and JPEG format to make them easier to upload to image sharing sites etc. BMP files tend to be huge.

    #49240
    TheCorfiot
    Participant

    Hi Andreas, its difficult to see the interference from the pictures but one thing for sure is that the regulator should not be getting hot like that.

    It sounds like there is an over current situation going on somewhere.
    Could you please upload some pictures of your installation on both sides of the board.

    #49250
    Andreas34346
    Participant

    Hi @buckoa51 and @thecorfiot.

    I uploaded the images on my server now, so wetransfer.com is not necessary anymore.

    Videostill 1:
    http://www.badgetracker.de/c64/rf-replacement/001.bmp

    Videostill 1 with Photoshop red lines:
    http://www.badgetracker.de/c64/rf-replacement/001-marked.bmp

    Videostill 2:
    http://www.badgetracker.de/c64/rf-replacement/002.bmp

    Videostill 2 with Photoshop red lines:
    http://www.badgetracker.de/c64/rf-replacement/002-marked.bmp

    Picture from Smartphone:
    http://www.badgetracker.de/c64/rf-replacement/003.jpg

    Picture from Smartphone with Photoshop red lines:
    http://www.badgetracker.de/c64/rf-replacement/003-marked.jpg

    I will test the next days the RF replacement on ASSY 250407, the pictures above are from ASSY 250425.

    Pictures of the installation will follow in a few days.

    Kind regards,
    Andreas

    #49251
    Andreas34346
    Participant

    Hi @buckoa51 and @thecorfiot.

    About the temperature of the voltage regulator on RF replacement:

    I checked the +9V UNREG voltage (which is supplied on PIN 1 at the RF-Modulator on longboards):

    On ASSY 250407 and ASSY 250425 the same results.

    The voltage is about 12.5 V. See the following picture:
    http://www.badgetracker.de/c64/rf-replacement/assy250407-9v-unregulated.png

    After checking the LM1117 datasheet, the maximum input voltage is 20V, the recommended voltage is 15V, so this should be ok. Maybe this is normal, that the voltage regulator gets hot.

    I use an Electroware PSU C64 B/EU (maybe this is an older version with 2.0A on 5 V DC)

    I never had a problem until now with this.

    Thanks for your replies until now.

    Kind regards,
    Andreas

    #49356
    BuckoA51
    Keymaster

    Can we please see pictures of the installation?

    #49374
    Andreas34346
    Participant

    These are the pictures of my ASSY250425 board with RF-replacement installed.

    http://www.badgetracker.de/c64/rf-replacement/ASSY250425-001.jpg

    http://www.badgetracker.de/c64/rf-replacement/ASSY250425-002.jpg

    http://www.badgetracker.de/c64/rf-replacement/ASSY250425-003.jpg

    All Commodore chips are original, only all electrolytic capacitors are replaced and voltage regulators are replaced.

    Kind regards,
    Andreas

    #49501
    BuckoA51
    Keymaster

    Installation seems good, can you email in with your order number please? I want to sort out a replacement bypass for you.

    #49544
    Andreas34346
    Participant

    Order #48948

    #49695
    BuckoA51
    Keymaster

    Ok please e-mail in so I can sort that out for you.

Viewing 10 posts - 1 through 10 (of 10 total)
  • You must be logged in to reply to this topic.