Question about Compaq Presario SR2020NX Power Supply Replacement
Computer not coming on
Indicates bad Power Supply,
The Power Supply in your Compaq is an SMPS.
Switched-Mode Power Supply,
The cooling components are Heatsink's used inside, and a small internal fan.
The Heatsink's used in the above unit, are located in-between the letters A/B and C, plus C and D.
Aluminum block shaped finned areas, that are spaced apart, then connected to each other by a piece of metal.
The Heatsink's absorb heat from whatever they are placed against, and their thin fins then radiate the heat away.
Air flow from the small internal fan, helps carry heat away from the thin fins.
As the computer get's dirty inside, so does the Power Supply. It draws air Through the computer, and exhausts it out the back.
As the 'Gunk' covers the Heatsinks, and internal fan; the Power Supply overheats.
[Gunk = Dirt, dust, hair, carpet deodorizer, lint,....you name it ]
Heat = Wasted Energy
The Power Supply strains to keep up with the call for power, but eventually cannot, and fails.
Components inside fail.
The Power Supply converts 100 to 240 Volts AC, from your home, or business; into three low DC Voltages;
In comparison two D cell flashlight batteries store 3 Volts DC.
In your 24-pin ATX main power cable, there are Orange wires, Red wires, Yellow wires; and Black wires.
Orange wires are 3.3 Volts
Red wires are 5 Volts
Yellow wires are 12 Volts
Black wires are Ground wires (Negative. Same/same. This is a DC circuit)
[Note* For this connector, color of connector does NOT matter ]
DO NOT attempt repairing the Power Supply.
The Radial Aluminum Electrolytic Capacitors, that are in the Input Stage, and marked by the letter B; are HIGH voltage.
An Electrolytic Capacitor can keep it's charge for weeks, months, sometimes over a year.
Your fingers touch the terminals on the bottom; the charge could be released to YOU!
Your fingers complete a circuit, that one or more capacitors are in; the charge can be released to YOU!
Shock is BAD to FATAL!
Replace the Power Supply.
A) IF all of the LED's were on at once, they would use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts of power.
C) A typical Processor can use 51 to 125 Watts of power.
Just depends on what Processor it is.
Specifications on HP Support, state it comes with an AMD Athlon 64 3500+ processor.
Reviews state it came out in 2006,
Believe it to be part number;
ADA3500IAA4CW (May 23,2006)
Uses up to 62 Watts
So you can see a Power Supply with a weak voltage rail, can light LED's, and maybe spin fans; but not have enough power to turn the Processor on, or keep it on.
Just thought you might like to know some of the stuff above.
Thought it would be better than, "Replace your power supply".
FOLLOW Anti-Static Precautions, BEFORE reaching inside your unplugged from power computer.
To make sure the Power Supply is your problem, before spending your hard earned money, you can test the voltages; or borrow a KNOWN to be good, compatible Power Supply, and use it for a temporary test unit.
Need guidance in replacing, or buying; post back in a Comment.
Posted on Jan 19, 2013
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Posted on Jan 02, 2017
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