DS412+ does not power up :(

[Vitaliy]

Looks like I fried the board as CPU start heating up badly

 

[grobius]

@Vitaliy, Sad to hear that you think your board is fried. Did you conclude anything from your attempts?

I'm having the same symptoms as you had

 

[DSfuchs]

@Vitaliy, Sad to hear that you think your board is fried. Did you conclude anything from your attempts?

I'm having the same symptoms as you had

Hi, mainboard defects are rare; in 95% of cases, the issue lies with Synology's internal flash storage.

 

[eln_70]

I have the same issue too with mine. Looks like the 5V rail is not OK. I've tried with a known good power brick and measuring on the +5V USB in the front, I see around 1300mV. Does anybody here know where to start?

 

[Jan Janowski]

If power supply is known good.... And Power plug removed, Look for discolored/swollen caps on motherboard and do a "Smell Test" You're Nose might help in finding it... Do a low resistance reading across 5V line and ground, at multiple locations.... Obviously you don't have schematic, so go across each of the caps, (Red or + to Positive, Black or - to ground or neg of cap.)....and If your meter does real low resistances, it might point you at a shorted cap.... You Might get lucky ???
If someone has schematic, post where the 5V regulator is... and if there is a series current limiting resistor on 5V line, measure resistance on either side of that resistor to ground... That will also confirm a short on 5V line, or regulator

 

[BangFR]

Hi,

I suggest you to check the voltage at the coils (big square labelled R56, 4R7, ...).
You should find the 5v rail,
1.5 ou 1.35 near the RAM,
more than 1v to the one next to the processeur (the voltage there depends on the processor)
and check if you have a solid 3.3v on the bios CHIP.

Of course this is only a quick check without charging the PSU

If you have a thermal camera, check around the hotest spot if you see any burnt.

You can also drop a high quality photo of your board