HP Pavillion 23 AIO won't power up, Motherboared PWR LED fl

September 17, 2017 at 16:23:10
Specs: Windows 7
I'm hoping someone else has had this problem or has seen/heard of it before.
I have an HP Pavilion 23-H TouchSmart All-In-One computer that won't power up. Initially I believe it took a power surge and cooked the mother board and power supply.
I have replaced, Motherboard, CPU, and Ram, CMOS battery and the power supply(with a genuine HP OEM unit).
Whereas before when I first looked at this unit there was nothing happening, no lights, fans, boot up, NOTHING.
VOM confirmed power supply was dead.
I installed all of the above new replacement components and the ONLY sign of life is the onboard motherboard PWR LED briefly flashes. I'm assuming as in other motherboards this light needs to STAY lit. IT DOES NOT.
This type of AIO computer was very problematic and was discontinued after 2yrs. One of the many problems was a faulty power on switch mounted on the upper left outside frame. But again VOM says micro switch is functioning correctly on this unit, but without motherboard power (as indicated by PWR LED) how can it boot up?

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#1
September 17, 2017 at 16:26:01
To all who maybe able to help, the one thing that defeats the "bad/defective POWER On/Off switch" (as the cause) is that with that scenario, the PWR LED next to the power in jack is LIT.

For some reason with all NEW components in this HP23 Touchsmart, that same PWR LED only flashes momentarily and then goes out.

Is it safe/correct to assume that if the PWR LED is NOT lit, there is no power to the motherboard? So even if the bad/defective POWER on/off switch was functioning OK, it wouldn't have an energized motherboard to turn on?

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#2
September 17, 2017 at 19:08:08
I think you were better off just buying a new PC than replacing that many components.

Have you checked the coin-battery is in the right position?
Did you apply the termal paste on the CPU correctly?
use one RAM stick and remove all other peripherals, HDD, DVD, etc..

Some video's suggest the power switch problem:
https://www.youtube.com/watch?v=p37...


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#3
September 17, 2017 at 21:26:30
Thanks sluc for the reply, and yes I've tried/performed all of your suggestions. As I stated in the second post the power switch is NOT an option because (according to the PWR LED) there is no energized motherboard to turn on!!

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#4
September 17, 2017 at 21:59:08
Have you confirmed that the power cord is getting power to the unit?
Have you confirmed that the power is getting from the power supply to the motherboard?
That the connectors are all fully inserted?
Have you inspected all connectors for signs of being burnt or wear?
That all reused wires are good (using volt and or ohm meter)?
Have you traced the wires to the momentary contact power button back to the motherboard and tried a wire jumper (or screw driver) to momentarily jump these contacts to confirm that the switch is actually closing the circuit?

You have to be a little bit crazy to keep you from going insane.


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