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

[Andreas34346]

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

[BuckoA51]

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.

[TheCorfiot]

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.

[Andreas34346]

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

[Andreas34346]

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

[BuckoA51]

Can we please see pictures of the installation?

[Andreas34346]

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

[BuckoA51]

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

[Andreas34346]

Order #48948

[BuckoA51]

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

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