Question about HP Compaq Presario SR1303WM (PP150AAR) PC Desktop
First, check the processor fan to make sure it is running, and make sure the heat sink is not clogged with dust. An overheating processor can do some weird things.
Second, look at the electrolytic capacitors next to the processor (these are small aluminum cans with a plastic wrap around the sides, mounted vertically on the circuit board). If the tops are bulging or have split and leaked material, they have gone bad and need to be replaced.
Third, check the power supply voltages (an oscilloscope is best for this, but few people besides electronic technicians have them) to make sure they are at their nominal values and do not have excess ripple.
Voltages are as follows:
Black wires - ground, measure voltage from here or the metal case to other wires.
Orange: 3.3 V +/- 0.1
Red: 5.0 V +/- 0.25
Purple: 5.0 V +/- 0.25, even when the computer is off (standby power, runs the turn-on circuits).
Yellow: 12 V +/- 1.0
White: -12 V +/- 1.0 (this is generally used only for audio circuits and may not be present)
Start by checking the red and yellow wires on a drive connector; not only is this easiest, but power supply problems generally show up here. The 5 volt supply in particular should be stable; the 12 volt supply may vary within its permissible range. Also check with the AC range on your voltmeter - the AC component should be less than 0.1 volts.
Posted on Apr 08, 2011
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Posted on Jan 02, 2017
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