No composite video output on A1200

Jonathan Drain · 05 October 2011, 13:22

My brother bought a second-hand A1200 recently, and hooked it up to a TV that works on my other A1200. Using composite + audio (yellow/white/red) to SCART, there's no video coming through, only audio.

I opened it up and noticed someone has done some soldering on the composite and RF modulator, on the bottom of the motherboard. The yellow composite connector has been replaced with a white one that looks the same as the white audio connector. The composite connector also had a slightly iffy solder joint, though I don't know whether or not that's the issue.

Any idea why composite connector wouldn't give any signal, and how to fix it?

Fingerlickin_B · 06 October 2011, 02:22

Maybe re-solder the iffy solder joint?

PZ.

orange · 06 October 2011, 08:10

does RF work?
its probably that connector. make sure the central 'point' is connected.

DDNI · 06 October 2011, 09:44

I think that is my A1200.
I tested it with composite on my Philips monitor. All seemed perfect so not sure what has gone wrong since I brought it round to Jonathan's brother.

Have you got an Amiga to RGB SCART lead to try? If not I can bring one around to test.

Loedown · 07 October 2011, 03:39

Quote:

Originally Posted by DDNI

I think that is my A1200.
I tested it with composite on my Philips monitor. All seemed perfect so not sure what has gone wrong since I brought it round to Jonathan's brother.

Have you got an Amiga to RGB SCART lead to try? If not I can bring one around to test.

Without looking at my A1200, whenever you have single or few RCA connectors coming straight off a mainboard it's often easy to crack the solder joints and / or tracks, my old 1084S had to have an entire retrofit done for the 9 pin connector as I destroyed the tracks over the years.

Jonathan Drain · 08 October 2011, 10:08

Quote:

Originally Posted by orange

does RF work?

RF doesn't work either. The weird thing is, the channel it's tuned into gives a black screen and no sound, rather than just static. My brother says RF sort-of works on his TV, but gets a very bad picture.

FOL · 08 October 2011, 12:21

Quote:

Originally Posted by Jonathan Drain

RF doesn't work either. The weird thing is, the channel it's tuned into gives a black screen and no sound, rather than just static. My brother says RF sort-of works on his TV, but gets a very bad picture.

Check the shematics, maybe BT101 or DAC problem.

Jonathan Drain · 16 October 2011, 04:34

Good news! We made an Amiga RGB to SCART cable and it works fine. Thanks to everyone for your help and advice.

05 October 2011, 13:22	#1
Jonathan Drain Registered User Join Date: Sep 2009 Location: Sector K240 Posts: 338	No composite video output on A1200 My brother bought a second-hand A1200 recently, and hooked it up to a TV that works on my other A1200. Using composite + audio (yellow/white/red) to SCART, there's no video coming through, only audio. I opened it up and noticed someone has done some soldering on the composite and RF modulator, on the bottom of the motherboard. The yellow composite connector has been replaced with a white one that looks the same as the white audio connector. The composite connector also had a slightly iffy solder joint, though I don't know whether or not that's the issue. Any idea why composite connector wouldn't give any signal, and how to fix it?

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06 October 2011, 02:22	#2
Fingerlickin_B Amiga Nut Join Date: Oct 2006 Location: Belco, Australia Posts: 2,242	Maybe re-solder the iffy solder joint? PZ.

06 October 2011, 08:10	#3
orange Registered User Join Date: Apr 2007 Location: Belgrade Posts: 567	does RF work? its probably that connector. make sure the central 'point' is connected.

06 October 2011, 09:44	#4
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,433	I think that is my A1200. I tested it with composite on my Philips monitor. All seemed perfect so not sure what has gone wrong since I brought it round to Jonathan's brother. Have you got an Amiga to RGB SCART lead to try? If not I can bring one around to test.

16 October 2011, 04:34	#8
Jonathan Drain Registered User Join Date: Sep 2009 Location: Sector K240 Posts: 338	Good news! We made an Amiga RGB to SCART cable and it works fine. Thanks to everyone for your help and advice.

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