820-00281-A Only 5v and 0.26amp not turning on

[MeTech Turkey]

R6908 beeps continuesly and value is 0.2 ohm
R6913 and R6910 has no beeps and no values shows OL on multimeter.
R6912 beeps continuesly and value is 10 ohm which is ok also.
C66907 will be replaced but waiting for the boardview of imac logic board.

 

[2informaticos]

Sorry, no schematic available for 820-01237.

 

[MeTech Turkey]

Ok then I have to find another logic board to buy or these components then I will get back to you

 

[2informaticos]

R6913 is 0 ohm resistor; you can bypass it with a wire, or solder blob.

 

[MeTech Turkey]

Did you mean R6908 because as you can see from attached photo on schematics pdf R6913 is 1.47K resistor.

 

[2informaticos]

Sorry, I was looking wrong schematic.
This happens sometime, when I have more threads opened; being tired also.
Discard my previous post, do not touch R6908; 0.2 ohm is correct value.

 

[MeTech Turkey]

Thats not a problem. Because there is no schematic for 820-02137 I need to find another logic board to buy for these R6913 and R6910 because when I removed them and tried to measure there was no continues beep and both shows OL and of course I need to find C6907 also. Then I will get back to you.

 

[MeTech Turkey]

I have a question can I find these resistors and capacitor from 820-01237 board without schematic. Is there a easy and quick way for this? Because nearest board is around 1 hour away from me and the options with shipping costing too much to be honest.

 

[2informaticos]

I told you to desolder one pin only; just to avoid losing them!
Usually means to move the resistor a bit, keeping one pin soldered.

If you deal with laptops repair (Apple or not), consider to buy some book resistor kits.

https://es.aliexpress.com/item/1005002762720838.html?gatewayAdapt=glo2esp

The resistors from this case are 0201, but should have in stock until 0805 (at least).

Don't waste money with capacitor kits; you will not use them almost.
Get scrap boards for capacitors replacement.

 

[MeTech Turkey]

I have done that desolder one pin only and measured but R6913 and R6910 gave OL on multimeter so I took them off. I dont do too much repairs only sometimes so there is no need for me to buy that book resistor kits. I am looking for a scrap board now for the resistors and capacitors.