Re: Old Compaq Armada internal PSU repair
Leave the primary capacitor alone. Measure voltage on startup capacitor that you replaced. If (whatever voltage) but consistent, you have a dead PWM controller on the primary. Since that PS is so old it is likely a jellybean part, see what the numbers are on it. Replace it.
If (whatever voltage) but pulsing, it could be either the controller or the resistor feeding the startup cap. More commonly the resistor in this situation. See the numbers or color bands on the resistor, take 1 leg out of resistor (make sure to discharge that big capacitor again before you do that!), measure resistor - if higher value replace resistor. If correct replace PWM controller. Should run then.
Leave the primary capacitor alone. Measure voltage on startup capacitor that you replaced. If (whatever voltage) but consistent, you have a dead PWM controller on the primary. Since that PS is so old it is likely a jellybean part, see what the numbers are on it. Replace it.
If (whatever voltage) but pulsing, it could be either the controller or the resistor feeding the startup cap. More commonly the resistor in this situation. See the numbers or color bands on the resistor, take 1 leg out of resistor (make sure to discharge that big capacitor again before you do that!), measure resistor - if higher value replace resistor. If correct replace PWM controller. Should run then.
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