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chrissydamage
Silver Member
United Kingdom
180 Posts |
 Posted - 11/18/2009 : 01:21:32
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Ok we all know the story, a typical case of DD-3-itis
(lights are on but no-ones home)
Thanks to Laurie I replaced the output opamp and success!! now we have delay-
But its all garbled, and I reckon the DRAM is dead too (it did look pretty burned on the board but I thought I'd try the opamp first just in case)-
The DRAM is soldered on an additional board with double solder joints-
Can anyone offer any tips or advice for removing these double soldered joints before I get stuck in? Or is it just a case of lots of patience and flux? |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/18/2009 : 01:32:19
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quote:
Originally posted by chrissydamage
But its all garbled, and I reckon the DRAM is dead too (it did look pretty burned on the board
The DRAM is soldered on an additional board with double solder joints
Errr... that's not standard. The RAM is usually just soldered directly in like all the other chips.
Can you post pics of yours?
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chrissydamage
Silver Member
United Kingdom
180 Posts |
Posted - 11/18/2009 : 02:01:34
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Maybe I'm calling it the wrong thing- its IC-6 in the extreme bottom left corner (see the additional board)
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/18/2009 : 02:28:11
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Oh... it's a V2. Righto then/
Desolder the daughter board from the main board by desoldering the daughter board pins on the main board (the main board is single-sided so is easier to unsolder. Once that's done, you can desolder the RAM chip from the daughter board with a bit (lot) of care.
If I was CERTAIN the RAM chip is fried and I had a spare................ I'd cut the chip off its pins and heat and remove each pin individually, then clean up the hole with some solder wick. (at yer own risk, pardner)
Good luck! let us know how it goes...
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Edited by - Laurie on 11/18/2009 02:30:27 |
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chrissydamage
Silver Member
United Kingdom
180 Posts |
Posted - 11/18/2009 : 03:43:24
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quote:
Originally posted by Laurie
Oh... it's a V2. Righto then/
Desolder the daughter board from the main board by desoldering the daughter board pins on the main board (the main board is single-sided so is easier to unsolder. Once that's done, you can desolder the RAM chip from the daughter board with a bit (lot) of care.
If I was CERTAIN the RAM chip is fried and I had a spare................ I'd cut the chip off its pins and heat and remove each pin individually, then clean up the hole with some solder wick. (at yer own risk, pardner)
Good luck! let us know how it goes...
Excellent, that sounds pretty straightforward - cheers dude.......
I was hoping the RAM will arrive as the whole daughter board assembly, but thats probably wishful thinking ;) |
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DD-3 DRAM replacement
