Imac 21,5 Inch 2015 late, Not turning on.

[Tjaboy]

Hello my name is Dylan

I got this problem my imac is not turning on.

what have i tried?

The 10 seconds joke with cable put it out and after 10 seconds back in, still nothing

New power supply, nothing happends

also the motherboard should give a light but no lights

i discovered that the motherboard has tapping shock waves,

i have search the problem trough my motherboard with a multi-meter, but every little part from top to bottom, it has shock waves,

so i tought maybe its a bad power supply but it is brand new? And you should et 2 beeps and atleast a light, but nothing,

i have tried to remove the hard drive completly but nothing.

What to do? I cant figure out wat it is And it is hurting my brain so much.

 

[Cory Cooper]

Hello and welcome.

It sounds like a logic board issue, since you have replaced the power supply. Yes, it could be a bad replacement power supply as well. But, without being able to see the iMac in person, it can be very difficult to diagnose.

C

 

[Tjaboy]

Hello and welcome.

It sounds like a logic board issue, since you have replaced the power supply. Yes, it could be a bad replacement power supply as well. But, without being able to see the iMac in person, it can be very difficult to diagnose.

C

Uhm, i have 2 things discovered,

i changed the 3V battery in the back,
And motherboard has power trough it but its not that much,

any tips to find out if the motherboard is something wrong?

i realy hope i can fix this because it costed me allot this imac so,

any tips ? I can check on? Of look for?

if need any pictures feel free to ask i will respond with the pictures,

 

[Cory Cooper]

Hi,

Since Apple doesn't publish schematics and component-level testing information, the only way to determine if the logic board is bad is to replace it.

Sorry, I don't have any additional information that may be helpful.

C