Main > Monitor/Video Forum
How to use SCART for our hobby
LeedsFan:
--- Quote from: Zebidee on April 26, 2010, 11:04:40 am ---I've seen this before - Looks like your TV is not properly into RGB mode.
TV is likely looking for composite video and getting some picture signal (e.g. sync) from pin 20 but not proper RGB. You need to add the signal to pin 16 to get the TV to look for signals on pins 7,11,15 (B,G,R)
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OK I got some 75 ohm resistors today. But before doing anything I checked my connections with a multimeter. I was already getting 4.3 volts at pin 16 with the jump wire from pin 20. However I decided to solder in the resistor and use a separate 5V supply from the PC molex. It hasn't made any difference. :banghead:
In fact... when I test the voltage at pin 16 with the resistor in line I still get a reading of 5V. Isn't the resistor supposed to lower this voltage? Can this be affecting the picture? Too high a voltage at pin 16? :dunno
EDIT: Seem I misread your first post on page 1 Zebidee. I read that you thought 75 ohm resistor gave better results... but on rereading your post you were talking about special cases where resistors were used on the RGB cables.... NOT the switching wire at pin 16. DOH!!! :banghead:
That's why I got the 75 ohm resistor and not 100 ohm. :dizzy: I will get 100 ohm tomorrow and get that voltage stepped down. Having scoured the net it seems that 3V is the maximum that pin 16 should take for RGB switching. Hope I can't damage anything by what I've done so far.
Zebidee:
--- Quote from: LeedsFan on April 26, 2010, 02:14:01 pm ---In fact... when I test the voltage at pin 16 with the resistor in line I still get a reading of 5V. Isn't the resistor supposed to lower this voltage? Can this be affecting the picture? Too high a voltage at pin 16? :dunno
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You must have done something wrong if the voltage is still 5v past the resistor :dunno
... oh, make sure that you have the cable attached to the TV and on when you test it with your multimeter, because otherwise you won't be properly completing the circuit.
LeedsFan:
--- Quote from: Zebidee on April 27, 2010, 05:26:06 am ---
--- Quote from: LeedsFan on April 26, 2010, 02:14:01 pm ---In fact... when I test the voltage at pin 16 with the resistor in line I still get a reading of 5V. Isn't the resistor supposed to lower this voltage? Can this be affecting the picture? Too high a voltage at pin 16? :dunno
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You must have done something wrong if the voltage is still 5v past the resistor :dunno
... oh, make sure that you have the cable attached to the TV and on when you test it with your multimeter, because otherwise you won't be properly completing the circuit.
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I'm at a loss here. I put the jumper wire back on over pins 20-16 and then retested the voltage with the plug in and TV switched on. I'm getting a reading of 2.5V at pin 16. The picture is still the same. If I have nothing attached to pin 16 it's still the same. Nothing I do with pin 16 seems to help. Is 2.5V still too high? I have all the ground wires from the Ultimarc breakout cable attached to pin 13. The only other ground is at pin 18 (ground for 12V at pin 8 )
EDIT: Hold on... I've been a right mong here... I just noticed all my RGB and Ground wires are on the wrong pins. What a ---missioncontrol---. :banghead: BRB... recitifying buffoonery....
Zebidee:
--- Quote from: LeedsFan on April 27, 2010, 12:02:32 pm ---EDIT: Hold on... I've been a right mong here... I just noticed all my RGB and Ground wires are on the wrong pins. What a ---missioncontrol---. :banghead: BRB... recitifying buffoonery....
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Ahhh - Good luck with that! Let us know how it goes.
LeedsFan:
--- Quote from: Zebidee on April 27, 2010, 12:51:48 pm ---
--- Quote from: LeedsFan on April 27, 2010, 12:02:32 pm ---EDIT: Hold on... I've been a right mong here... I just noticed all my RGB and Ground wires are on the wrong pins. What a ---missioncontrol---. :banghead: BRB... recitifying buffoonery....
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Ahhh - Good luck with that! Let us know how it goes.
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Still no luck. Now I just get a black screen on AV channel.
I didn't have the RGB wires on pin 15, 11 and 7 before. They were on 13, 9 and 5 with grounds at 11. I was misreading the pin numbers the wrong "side". Really thought I'd solved the problem when I saw I'd done that. :dunno