Main > Monitor/Video Forum
How to use SCART for our hobby
Paradroid:
Another field report...
I went for a trip down the road tonight and tried out a Bang & Olufsen Beovision MX6000 that I saw on eBay. Amazing looking unit! Very "space age" and a real work of art. However, although it worked very nicely with MAME using SCART (good colours, no dot crawl), the actual image wasn't anything above the Loewes and Grundigs I've now tried. Plus, there was a bit of a defect in the very top part of the image: straight vertical lines showed something of a horizontal indent in the image. Considering the TV cost about $5,000 new, I found that surprising.
Overall, if I saw one of these cheap, I reckon I'd grab it. However, the owner was after top dollar so I decided it wasn't worth the asking price.
Definitely a viable option for MAME/SCART but not worth paying a premium for if (as I was) you're expecting the picture quality to equate directly to the original retail price.
Jollywest:
--- Quote from: Zebidee on October 13, 2011, 05:56:31 am ---Try testing the voltage available to pin 16 while on and in circuit. It should be in the range 1-3 volts. Then try doing that for R-G-B. It should vary between around 0-1 volts.
--- End quote ---
Only just had chance this morning to have a crack at this, Still no luck with getting a picture on the TV though.
I checked the voltages, the +5v (with 100 Ohms resistor) measures at 2.5v and the R-G-B measures at 0v. However when measuring the R-G-B there isn't any fluctuation at all on the meter it just stays on 0v, is this normal?
I did receive the cab untested so I don't even know whether the game PCB does work, Red lights come on the PCB but the monitor was shot so I couldn't tell if it did work. Could it be that there is no RGB signal coming from the PCB?
I've attached a pic of how I've connected it up, excuse the crude wiring its just for testing at the minute.
Zebidee:
--- Quote from: Jollywest on October 15, 2011, 09:41:47 am ---
--- Quote from: Zebidee on October 13, 2011, 05:56:31 am ---Try testing the voltage available to pin 16 while on and in circuit. It should be in the range 1-3 volts. Then try doing that for R-G-B. It should vary between around 0-1 volts.
--- End quote ---
Only just had chance this morning to have a crack at this, Still no luck with getting a picture on the TV though.
I checked the voltages, the +5v (with 100 Ohms resistor) measures at 2.5v and the R-G-B measures at 0v. However when measuring the R-G-B there isn't any fluctuation at all on the meter it just stays on 0v, is this normal?
--- End quote ---
Switching signal voltage seems OK. The R-G-B voltage levels will vary depending upon what colours the PCB is trying to display. So, if the PCB is on black screen then there would be zero R-G-B voltage.
--- Quote ---I did receive the cab untested so I don't even know whether the game PCB does work, Red lights come on the PCB but the monitor was shot so I couldn't tell if it did work. Could it be that there is no RGB signal coming from the PCB?
--- End quote ---
Very possibly. You have too many unknowns. You need to test the PCB separately as its status is unknown. If you had another SCART cable and a MAME PC setup then you could at least test the TV separately.
Jollywest:
--- Quote from: Zebidee on October 15, 2011, 11:30:55 am ---You need to test the PCB separately as its status is unknown. If you had another SCART cable and a MAME PC setup then you could at least test the TV separately.
--- End quote ---
I've tested the TV on a MAME PC I have and it does show a picture (see pic attached), So the cable is fine. I've also tested the PSU and that's ok as well, So it looks like it is an issue with the Video coming from the PCB. I guess the next step is to test the PCB, Not sure where to begin really, any pointers? Thanks for the help so far by the way.
Zebidee:
--- Quote from: Jollywest on October 15, 2011, 01:40:58 pm ---So it looks like it is an issue with the Video coming from the PCB.
--- End quote ---
Try another PCB? Maybe try a cheap multi game one from ebay. Or run your mame PC through a JPAC?