Thought you guys might be able to help me with a Thermaltake TT-500NL2NK-2 PC power supply. It has a lowish voltage on the 12v+ rail. I have checked all the capcitors and silicon components on the LV side and they all seem ok. All the other voltages are good except the 12+ which is about 11.4v. Is this just a fact of life with this supply? Just down on spec, or is it something out of tolerance? I cant find a schematic for it (if anyone has one that would be great) so I am at the moment tracing everything back on the 12+ rail to see if I can find whats out of spec. The attached picture shows the controller IC SD6109. I have marked up all the voltages on all the pins with respect to ground. Anything with a tick is wihin spec for the data sheet, but I dont have the understanding as to what is regulating the 12+ from this chip, or if a FB voltage needs to be lifted to get say 12v+. Any thoughts would be helpful.
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This site includes details for a number of ATX PS, including several that use a SG6105, which appears nearly identical to your control chip. I would guess that these designs are going to follow the reference design quite closely, so you may be able to get some additional debugging assistance from those schematics, and with luck one of them might be a clone.
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Thanks, will check it out
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