820-3115 Not Recognizing Ram With 1 Beep Intervals

[supamodz]

Looking for some assistance here,all power rails present unit turns on fan spins with 1 beep every 5 or 6 seconds. Frapple site says no ram installed, i checked every rail 1 by 1 everything read normal no water damage viable. I replaced the u7300 chip i tried different rams different slots all same issue i even ultrasonic cleaned the board. What else could i check to try and solve this issue?

 

[dukefawks]

You replace U7300 but did not measure its output voltage?

 

[supamodz]

i did it supposed to be 3.3 v correct pin 17

 

[supamodz]

sorry pin 17 was in pin 20 pgood is out i get 0.75v

 

[dukefawks]

Who cares about pin 17 and 20 I just want to know if there is voltage on L7330..

 

[jadao]

If you have all rails, I2C bus maybe?

Check if the clock and data serial lines shared with SODIMM-A/B are healthy (compare diode mode readings with good board, check pull up resistor value, trace continuity)

I had one liquid damage 2936 or 3115 board, fucked bklt chip LP8850 pulled down one of the SCL/SDA data line and had the one beep no RAM.

Good luck

 

[larossmann]

If there is voltage on L7330, then this is some drop that won't get fixed. If you don't have voltage on L7330, then probably a dead U7300. What voltage is on L7330?

 

[supamodz]

Hey Louis its about time you got your word in its 1.5v which sounds like its a dead peace of crap because i replaced the u7300 already