On Thu, 29 Mar 2007 19:27:32 -0500, CBFalconer
<cbfalconer@yahoo.com> wrote:

>Skeleton Man wrote:
>>
>>> The parts in my 350W Ultra/Wintech with numbers starting with "LT"
>>> are dual Schottky diode packs and are mounted on the low voltage
>>> heatsink.
>>
>> That sounds about right for mine... this one is like in the middle
>> of the low voltage side right infront of a transformer.. (there
>> are a few mounted next to each other further back, but those appear
>> to be ok). The diagram on the package looks like this:
>> ---->|---|<---- (two diodies pointing toward each other).
>>
>> My biggest challenge is going to unsoldering the heatsink I think..
>> too many components in the way to unscrew the part from the heatsink
>> and remove seperately..
>
>Consider a propane torch. I kid you not.
>


I agree, have used one myself though it is a small
pencil-sized torch. Main thing about using one is you have
to be a bit practiced at it to get a feel for how far away
and how long to apply the heat to get the solder melted
without burning the board. Thus it would be good to
practice the technique on something worthless.

Another issue is that some of these (cheaper PSU,
especially) may have thin copper that is beefed up by being
flooded with solder. A lot of solder that can be a pain to
manage when heating a larger area.

The Wintech PCBs I've seen had fairly generous (overly
large) holes and are single-sided (copper), they also do
fairly well with a typical solder-sucker to clean around
each pin of the components, then either desoldering wick to
remove, or a probe to push the pin away from, what little
solder remains around it. It still requires what the OP
lacked, a more robust soldering iron. Personally I would
focus on getting such an iron before I'd put money into
repairing a generic PSU, as the iron is far more useful and
long-lived.