1502 820-4924 Pulsing at L7560

dukefawks

Administrator
CPU Vcore also pulsing? Check if the rest of the rails are pulsing too. I doubt this "just" happened, ask the owner what happened.
 

Tony Tone

Member
He claims he was using it and seen a wisp of smoke and it stopped working. I see zero evidence of water.

Other3V3, S4_X239, S4_tpad, PP3v3_S5 all pulse. PP3V3_S4 pulses very very low. I think the VCORE was zero.

I see nothing burnt out. Tried new DCIN, and new battery as well.
 

Tony Tone

Member
I get pulsing off of C1845-1 and PPBUS_G3H is stable 12.85-12.87.
On and off pulsing at C8060-1
 
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dukefawks

Administrator
12.8 is too high which is strange. Is your multimeter battery low? Check accuracy of the meter, PPBUS should never be higher than 12.58V.
If meter is OK then check sense resistor circuit for ISL6259.
 

dukefawks

Administrator
See if the board does anything in SMC bypass mode. Hold power button and connect AC, hold for 5 sec. more and release and press again. PPBUS should come up at 12.23V now.
 
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