Computer HP Slimline s5000 System NY511AA#A2L
Motherboard MS7525 Ver. 1.0
I received this computer totally dead. Nothing turns on.
When opened it was full of dust/dirt and I cleaned it up.
-First I removed the disc drive, hard disc and all other periferals except my monitor, one at a time, trying to turn on each time. Nothing happened.
-Next I removed the power supply and checked voltages with PSon grounded to com. All voltages OK. Reconnected and noted the power supply does not turn on when ON switch pressed.
-Checked continuity of ON/OFF switch OK.
-Jumpered PSon to com on plugged in main connector. Connect AC and no result.
- Power supply works with 4pin 12V connector plugged in alone but not the 24 pin alone or both together.
- replaced motherboard with new unused one. Same problem. Hope I did not damage it.
- Ram in&out same problem.
-Close inspection of capacitors on both boards. All look OK.
Now I am looking for what else could prevent the PSU from turning on with a verified OK switch, power cord checked etc.
- Tried anther CPU but not sure of its condition. No result.
- measured resistance on each of the 24 pins to com. on the motherboard to look for abnormalities. No shorts. Detect capacitor charging on each active pin. Nothing unusual.
- now I am just scratching my head.
Would appreciate any input.
Motherboard MS7525 Ver. 1.0
I received this computer totally dead. Nothing turns on.
When opened it was full of dust/dirt and I cleaned it up.
-First I removed the disc drive, hard disc and all other periferals except my monitor, one at a time, trying to turn on each time. Nothing happened.
-Next I removed the power supply and checked voltages with PSon grounded to com. All voltages OK. Reconnected and noted the power supply does not turn on when ON switch pressed.
-Checked continuity of ON/OFF switch OK.
-Jumpered PSon to com on plugged in main connector. Connect AC and no result.
- Power supply works with 4pin 12V connector plugged in alone but not the 24 pin alone or both together.
- replaced motherboard with new unused one. Same problem. Hope I did not damage it.
- Ram in&out same problem.
-Close inspection of capacitors on both boards. All look OK.
Now I am looking for what else could prevent the PSU from turning on with a verified OK switch, power cord checked etc.
- Tried anther CPU but not sure of its condition. No result.
- measured resistance on each of the 24 pins to com. on the motherboard to look for abnormalities. No shorts. Detect capacitor charging on each active pin. Nothing unusual.
- now I am just scratching my head.
Would appreciate any input.
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