Component board and A/V port still working?

[jdryyz]

I installed my component mod board today. I opted to put it into my 250466 SixtyClone to avoid any fitting issues. I did find it necessary to remove my TOLB clock replacement as it was interfering with the VIC-II board. An original 8701 chip was installed and the VIC-II board fit just fine.I also had a bit of a challenge with placement of the main PCB so that it lines up with the case openings but I ended up using some square female pin header sockets that I cut down. Not very attractive but it works fine.

The board works just fine pumped through my OSSC’s component input, although there is a slight border on the bottom of the screen. Since my monitor’s HDMI input does not allow for position adjustments, I will have to adjust the OSSC’s settings instead. I know that won’t be as easy as it sounds.

So what I am confused by is that it was my understanding that the A/V port on the C64 would still be functional. The output quality is said to resemble what you would achieve if you had an R/F mod bypass installed. I am very familiar with that since I have two similar boards installed in other C64s. With component board installed, my A/V monitor is now showing “no signal”. To be more precise, my S-Video to VGA adapter is not detecting a signal. This converter works fine on the C64’s unmodified A/V out.

I tried moving the default slider switch position to 240p/288p thinking it might have something to do with it but it did not help.

Did I miss something with the install or is the chroma/luma signal coming out of this component-modded C64 different in some other way?

Since the only other thing I touched in the C64 was the clock chip, I wonder if I may have killed it. It is a MOS chip after all :). Does the component board still depend on this clock signal or does it generate its own? If the chroma/luma still needs it, this could explain the lack of signal if I in fact killed it.

[BuckoA51]

The component board would still need the clock chip yeah.

Did you test the outputs on a multimeter see if you’re getting anything at all?

[jdryyz]

Thanks on the clock chip info.

When you say test the outputs using a multimeter, did you mean while the C64 is on?

I do plan to test all eight A/V connections on the C64 PCB for continuity but I was going to wait until my new pin header sockets arrive. The new ones are the break-away type so should be a cleaner installation.

I can still test for continuity from the top of the component PCB over to the A/V port pins. I will do that and report back.

[jdryyz]

I’ve got continuity from the top of the PCB to the A/V port pins for all of the important signals (Luma, Chroma, Comp and Ground). I was a little confused by the numbered pin outs from a diagram I found but that may be the info or just me not interpreting it correctly.

So if all of the lines are good, could be a component on the PCB not working correctly?? All looks good visually. If there is an area on the PCB I should be focusing on for the chroma/luma output, I can test.

[jdryyz]

I installed my new pin header sockets. I basically followed Jan Beta’s lead in his Component Mod install video. I found a local source for the same sockets he used since they provide the correct height needed to line up the board with the case openings.

Unfortunately, the new sockets and pin headers did not help. Component output still works but Chroma/Luma does not.

Any other ideas? I do not have an oscilloscope or logic probe but if there are measurements I can take with my multimeter, please advise.

Thank you.

[jdryyz]

I wanted to be sure my problem had nothing to do with my 250466 board so I installed the component mod into a 250407 Rev C (SixtyClone) board.

Component works still but I now see the artifacting/video glitches that have been reported. I know the fix involves updating the firmware (if not already) and then applying some hardware fixes. Since I do not plan to use the component mod in the 407 board, I am not too concerned about this.

Still no A/V output when in the 250407!

Can anyone suggest a next course of action to troubleshoot what might be wrong? Otherwise I suppose I will need to look into what the RMA process is for this product.

Thank you.

[BuckoA51]

Maybe an obvious question but have you tried a different S-Video cable?

[jdryyz]

Yes, more than one cable was tried.

In addition, the cable I normally use works fine with other C64s.

[Author]

Posts