bluebird
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Top 10 lines of picture warping on CRT

05 Jul 2020, 01:16

PCEngine model: PC Engine Core II and TurboGrafx 16

Power Supply: OEM NEC supply and third party, no difference in behavior

Video cable: RetroGamingCables Mega Drive 2 CSYNC, both a brand new "packapunch" cable and an older one.

SD card brand: Lexar

Region modded?: No

SSDS3 revision 1, 2 or B?: B (purchased at the end of May 2020)

Any other details specific to your setup: CRT, Sony PVM-14L5, two different units that show the same behavior

Problem or Issue: The top 10 or so lines of the picture are warping on my CRT. Not just at the edges, but along the entire horizontal axis.

  • The behavior is the same on the PC Engine Core II and TG16.
  • Also tried Mega Drive composite through the SSDS3 and the picture is warping in the same way.
  • Tried a second PVM-14L5. Same problem.
  • Picture looks fine via Composite without the SSDS3 connected.
  • Took my SSDS3 apart and noticed discoloration on the board near the solder joints for the expansion port and AV port.

Photos: https://imgur.com/a/2TrXkgm

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Todd
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Re: Top 10 lines of picture warping on CRT

05 Jul 2020, 04:53

That’s interesting. Purchase from us or SAG?
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bluebird
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Re: Top 10 lines of picture warping on CRT

05 Jul 2020, 04:56

From you.

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Todd
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Re: Top 10 lines of picture warping on CRT

05 Jul 2020, 05:11

I know you mentioned trying this on a pair of 14L5s. Do you have any other displays or video scalers to try?
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bluebird
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Re: Top 10 lines of picture warping on CRT

05 Jul 2020, 06:44

The picture isn't warped through the OSSC. The next time I'll have access to another CRT is early next week.

It's also worth noting that I use a wide variety of other systems and addons over SCART with the 14L5 and none of them exhibit this issue.

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Todd
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Re: Top 10 lines of picture warping on CRT

05 Jul 2020, 07:11

Hmmmmm. If the issue isn't happening through the OSSC, that would leave me to believe this could be some odd compatibility issue with the 14L5. There must be something in the signal it doesn't like.

Would be interesting to see how it behaves with other CRT displays.
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bluebird
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Re: Top 10 lines of picture warping on CRT

08 Jul 2020, 21:22

I tried it on two Toshiba CRTs at my workplace, both with pretty terrible geometry, and couldn't really tell if the same issue was happening with them. It didn't look as bad as the 14L5, if it was happening.

Not sure what to do from here. All signs point to the SSDS3 being the problem but it seems to be specific to those little L5s... which is super unfortunate. The image on them is stunning otherwise.

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Mobiusstriptech
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Re: Top 10 lines of picture warping on CRT

09 Jul 2020, 06:53

The only thing you can do is try using a sync stripper. Which is an awful way to "fix" an issue but the PC Engine sync signal is know for being a bit off compared to other systems. I've seen this issue on certain Ikegami monitors too.

bluebird
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Re: Top 10 lines of picture warping on CRT

09 Jul 2020, 19:15

I'll take a look at a sync stripper - thank you for the suggestion!

bluebird
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Joined: 05 Jul 2020, 00:59

Re: Top 10 lines of picture warping on CRT

16 Jul 2020, 01:51

I hate to say it, but I ordered a SCART to BNC cable with an inline sync stripper... and that had no effect on the warped lines.

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