OSSC 480p and Panasonic TC-P50S60

[blitter]

Got my DIY OSSC up and running at the office and it spits out a gorgeous 480p signal to the Insignia NS-32D311NA15 TV on my desk. At home though, where I intend to have it permanently set up, I have a Panasonic TC-P50S60 and it does not recognize any signal from the OSSC at all– no test pattern, no picture from any of the inputs. I’ve tested it with a NESRGB, RGB N64, and SCART PS2, using firmwares 0.69, 0.70, 0.73, and the latest 0.74a, all with the same results at home. Looks like member deltronik has the same TV as me and got theirs working (https://videogameperfection.com/forums/reply/8069/) so I’d like to believe there’s some setting I can fiddle with on my unit to at least get the test pattern to show up. Any ideas? My wall-wart PSU is kicking out 5.37V under load so I doubt the PSU could be the cause, but honestly I’m at a loss– it could be anything.

[BuckoA51]

No test pattern is extremely rare, have you checked your cabling?

[blitter]

Yep– tried three different HDMI cables all known to work with other 1080p sources. No dice. 🙁

[marqs]

It sounds like you might have DDC5V signal disconnected from HDMI output, as some displays won’t display anything without that 5V status signal. I suggest checking that fuse F2 is okay and that HDMI pin18 is connected to other end of the fuse.

[blitter]

Hi marqs, I checked my unit with no display connected– F2 is fine (no measurable resistance across it), pin 18 is carrying a solid 5V, and pin 15 is high.

[blitter]

Just tested it against my SC512N1-L capture card, and I get the same results as on my Panny– no signal. Don’t know if that’s useful info but figured I’d relay it anyway.

[blitter]

Just wanted to report that I finally got my OSSC working on my Panasonic. Curiously, if I connect the OSSC directly to one of the HDMI inputs on my TV as described above, I get no picture. But if I run the OSSC first through a cheap passive HDMI selector switch, it works perfectly. Strange– maybe the switch “cleans up” the signal coming from the OSSC in some way? I can’t explain, but I can’t complain. 🙂

[BuckoA51]

Definitely sounds like DDC5V and/or cabling problem.

[lepo76]

What kind of hdmi switch are you using, I may give that a go since I’m having exactly the same issue on my Panasonic Viera.
Tried 5 different hdmi cables and all hdmi ports… test pattern never shows up

(Ossc works fine on an hp pc monitor)

Thanks

[marqs]

Test pattern not showing on a monitor or capture card is an indication of damaged hardware. If you have a multimeter with a diode tester function on hand, try measuring (while OSSC is off and disconnected) forward voltage from ground (e.g. DVI chassis) to TMDS link1 and clock pins (8 total). You should measure 500-600mV in each pin if HDMI transmitter IC is undamaged.

[lepo76]

A friend of mine has a multi meter so hopefully we’ll manage to get some answers

I’ll report back once we are done. Thank you

[lepo76]

Haven’t checked with the multimeter yet but using a passive hdmi switcher, as reported by blitter, does something to the signal and the initial test pattern shows up, as expected. This makes two of us

Tested on two TV sets and got the same result

[lepo76]

Results from the multimeter test:

Pin 1 = 0.59mV and beeping while testing
Pin 2 = 154mV
Pin 9 = 519mV
Pin 10 = 519mV
Pin 17 = 520mV
Pin 18 = 200mV
Pin 23 = 519mV
Pin 24 = 519mV

[Author]

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