Help!!! PA4X after shutdown, it no longer turns on

Pedro555 · Post by **Pedro555** » Fri Oct 01, 2021 6:25 am

musiccankill wrote:
Pedro555 wrote:
unfortunately, there are no specialized service centers in the country, the power supply was checked, everything is in order with it, and if it is a motherboard, then I don't even know what to do
and the device is practically new
The power supply should be checked after prolonged usage (when the keyboard fails to boot , while it is connected to the entire system ) with an oscilloscope to check for correct and stable voltage (no ripple in the DC rail).
If that is how it has been checked then most probably the cpu board and/or main board are at fault.

that's exactly what they did, but everything is fine with the power supply, if it's a hardware problem, then somewhere else

Pedro555 · Post by **Pedro555** » Fri Oct 01, 2021 6:31 am

new information...
yesterday the mp3 player worked all day, turned off and turned on normally, turned it on today, decided to reset the factory settings, after that I didn't want to turn on. after 10 minutes I was able to turn it on, I decided to copy the information from the flash drive to the hard drive, copied it, turned it off and again could not turn it on

Pedro555 · Post by **Pedro555** » Fri Oct 01, 2021 6:32 am

no one knows if the RAM card is removable or built into the motherboard?

AntonySharmman · Post by **AntonySharmman** » Fri Oct 01, 2021 9:17 am

Flash memory is mounted on motherboard but is not your issue , you have another "deeper" motherboard issue that is quite hard to be investigated ,
I'm afraid that you have to swap the whole motherboard !

A technician should also check "enable" of PSU input that is controlled by a mosfet in CPU board when you turn Pa4X on , it could be defective and do
not function properly that's why sometimes it delays to supply main circuits.