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19 September 2009, 18:47
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#1 |
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Targ Explorer
Join Date: Mar 2006
Location: Northern Ireland
Posts: 5,433
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Unstable A1200 Composite
Hi all,
I have some issues with my A1200 composite. The display wobbles and jumps. It is showing colour correctly. I have tried three different leads and four different TVs. I thought that the motherboard connector was giving a poor contact, so I replaced it. The issues remain. RF is OK. Is the big electrolytic cap r234D (behind composite connector) involved in the Composite display? It looks ok, but I am suspecting a Cap problem. |
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19 September 2009, 19:01
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#2 |
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70X7
Join Date: Apr 2008
Location: Ἑλλάς
Posts: 1,078
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similar problem before months for me.. unstable video also darker screen
check here > http://eab.abime.net/showthread.php?t=43207 hope to help.. |
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19 September 2009, 19:11
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#3 |
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Targ Explorer
Join Date: Mar 2006
Location: Northern Ireland
Posts: 5,433
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Ta Anemos. So you added both an LED and a Cap to D233A?
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19 September 2009, 19:14
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#4 |
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70X7
Join Date: Apr 2008
Location: Ἑλλάς
Posts: 1,078
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yes both
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19 September 2009, 20:20
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#5 |
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I hate potatos and shirts
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 58
Posts: 3,482
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If the part is listed as "R"234D it is a resistor...
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20 September 2009, 13:29
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#6 |
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Targ Explorer
Join Date: Mar 2006
Location: Northern Ireland
Posts: 5,433
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I don't have a 1uF cap in my box of bits. I have a 2.2uF 5v. Will this do?
It seems to be the correct uF rating for this similar fix on Aminet. Has anyone tried the Aminet fix? I have an Light diode which I can add into the 2.2uF Cap if needs be. Last edited by DDNI; 20 September 2009 at 13:35. |
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21 September 2009, 19:03
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#7 |
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I hate potatos and shirts
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 58
Posts: 3,482
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Will do.
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21 September 2009, 19:10
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#8 |
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Targ Explorer
Join Date: Mar 2006
Location: Northern Ireland
Posts: 5,433
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Okay thanks.
So I spent yesterday dismantling my A1200 tower and adding a cap to the A1200 mobo (rev. 1D1). It seemed to work, but after about 10 minutes the display from Composite and RF failed completely. RGB still works fine. Am I right that RF and Composite use the same signal? So if one fails then the other is likely to aswell? Is it worth fixing this? What do you feel is likely to be the fault? |
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22 September 2009, 01:29
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#9 | ||
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I hate potatos and shirts
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 58
Posts: 3,482
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Quote:
Quote:
As to if worth fixing... Depends if you have or not a real monitor or use your Amiga in other places (like friend's house for some gaming). Best thing to do with the RF box is sack it out and use its place for another useful hack. |
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