820-3299 3 beeps and 2 LEDs

[protocold]

tested with good known ram and connected with only fan, power and left speaker with everything else disconnected..

I also disconnected RAM sticks and it gives me 1 beep in this case. Put it back, 3 beeps.

Unknown history.... where to start?

 

[2informaticos]

Do you have RAM test card?

 

[protocold]

This?

 

[2informaticos]

Yes, check if all lines have good continuity.

 

[protocold]

Trying to figure out how to use this, without power plugin and this card in one of the slot, I saw only 4 bright leds… am I doing this correctly? What does this tell?

 

[2informaticos]

Of course, no power connected to MLB.
Also normal to get 4 brighter LEDs.
Any of the rest stays off?

 

[protocold]

half of the leds are off (i am guessing because those are for the other side/edge?)
half of the leds are on and weak and 4 are brighter than others

Do i need to test all 4 slots? I will need to remove the button battery and extend with wire as it block the space....

 

[2informaticos]

Test all slots, of course.
Compare lights behavior with working board.
Can be another model, but same kind of RAM modules.

 

[protocold]

seems like i am getting intermittent result... i also tried to test this on a macbook logic board and the result are different..

all leds supposed to be on (weak) with a few brighter i guess?

 

[2informaticos]

Yes, always should get the same brighter LEDs.
Any other LED going brighter means short to ground on that line.
No LED means open trace on that line; possibly broken solder ball under CPU also.