Restoring a Commodore 1702 monitor using a main board from 2023

11:53 is the red markup correct? By this diagram it seems like both sides of the lower replacement capacitor are directly shorted to ground.

A perfectly acceptable mod for a worn out 1702, otherwise the chances of finding a good replacement tube were slim to none! Now the monitor is usable again and looks cosmetically original.

This video is golden for me, I'm stuck in a PAL/NTSC world being originally from the UK and brought all my PAL machines across the pond. I'm ordering one of these boards.... and a spare! Thanks Adrian!

In USSR we also faced problems with croma/luma interference an there was no such thing as s-video at all. So we used to play a trick building high-reciceon rejection filtets that cut only luma frequency not whole upper band. That helped with sharpnes but requred different filters for SECAM and PAL (there were no use for NTSC in USSR)

A seriously comprehensive service menu for set manufacturers not like the limited ones you normally see on commercial TVS. Perfect for this type of DIY project

This is a game changer for the North American Commodore community! Having PAL monitor working like that is awesome! 👍

You didn't ruin a thing. You made a worn out display useful and even more capable while leaving the original look and feel intact from the outside. Great mod!

I admit I was skeptical at first about how well this would work. The results shocked me a bit. I really didn't expect it to work that well. Nicely done.

About the color delay line filter for PAL. In NTSC, such a delay line filter is also called a COMB Filter. Different degrees of quality COMB filters exist from cheap 2 line delay to 4 and 5 line adaptive filtering. When properly executed, such a filter is used to eliminated dot-crawl and color fringing, allowing fine vertical white line to appear as if you were using S-Video in the first place. Using the Y/C or S-Video input supposed to completely bypass this filter. BONUS for NTSC: If you have a Sony HI-8 deck, or S-VHS, the have an advanced adaptive digital 4 line comb filter built in meaning if you send composite to their composite video line-in and use the VCR's S-Video output to drive your monitor, even with your test-pattern generator's vertical bars feeding the VCR, the VCR's S-Video output will look as good and have all the fine vertical res line test patterns at the top right as if you were using S-Video directly from your color bar test pattern generator, without the NTSC dot crawl as well. If you have Sony's PAL versions of their top tier HI-8/S-VHS decs, their PAL S-Video output will have corrected the vertical color bleed so long as your TV's PAL Y/C input doesn't have any additional processing.

I have no qualms about people modifying “vintage” electronics, including the 1702. It’s your equipment; the fact that you’re working on it means it still has life and has been saved from the landfill. Someone cares enough to work on this old equipment and keep it going for awhile longer. Keep up the great work!

At 38:42 the remote was working even with the flap up! Always amazes me to this day how remote signals seem to work even if pointed in completely the wrong direction!

It is awesome to have a PAL set in North America like so many others mentioned and I agree that the Commodore monitor looks much nicer and fits the retrofit better than the TV did. If you have non-working monitor board that resists revival this absolutely makes sense as a way to restore it to being useful again.

In Germany the HF mode was always channel 36 PAL BG. There were no television stations on channel 36 because there was another radio service. But the channel was used for video recorders and computers. England also had PAL. The C64's video and S-video output wasn't quite up to standard.

Tip for supporting PCB with out screwholes - use a bolt and nnut in chassis and two plastic rectangles with a hole for bolt on top/bottom - it supports PCB while maintaing electrical isolation

Really enjoyed this one! I tend to err on the side of "restoring to stock" but like how you addressed that later in the video, and there was surprisingly little hacking up the plastics. Awesome stock look in the end! I'm no Commodore expert, but do have 13 (!) of these 1702s awaiting restoration, and can tell you there's a HUGE variance in the phosphor colour between them all. And.. your new dark phosphor looks great!

What a journey, man! Thank you so much. I doubt I might ever do something like this - but it is lovely to know it can be done - and how it's done.

I didn't love CRTs back in the day and I still don't (they're large, awkwardly bulky, heavy, and relatively fragile), but Adrian's love for CRTs is contagious

This was really satisfying. You ended up with so many benefits that normal monitors don't usually have. Saved presets, RF, multi system, and it can still function as a TV, if required. Even the compromises aren't bad. A lower res CRT gives a smoother image - almost like antialiasing for older systems. And you already have other high res monitors when you need them. This monitor is now really special and unique.

The chroma level in C64 (at least early models) is 1Vpp (same as luma), which differs from the modern S-Video standard, which expects 300mVpp. Of course, the chroma probably has an ACG circuit, which would compensate for slightly off levels.

The original CRT in the 1701/1702 had a 0.64 mm dot pitch! That was typical of color monitors designed for 40-column text. They just used an ordinary color TV picture tube. Monitors designed for 80-column text had a dot pitch of 0.52 mm or less.