I have here working with Lenovo g570 UMA version LA-675AP rev:1.0 , the problem is laptop turns on then a seconds it goes off, I already tried both flash main and ec bios but still same issue, I noticed the all tantalum 330uf and ceramic around cpu area are both shorted, tried replacing one of them PC711 still shorted, tried replace ISL 95831 PU601 still shorted, also tried removing each component and cpu but all caps are shorted, also PQ601 and PQ602 both drain connected to PC711 are all shorted, anyone can help on this please
-
-
Re: Lenovo G570 shorted vcore
Vcore is often a low voltage power rail. Respectively, it is common to show low resistance on that rail. This does not imply a shorted component is on that rail.
Post the resistance to ground on that rail.
Post the schematic & boardview files for this logic board. -
Re: Lenovo G570 shorted vcore
resistance on PC711 positive side 33.5ohms same with mosfet pq703 drain sideComment
-
Re: Lenovo G570 shorted vcore
1) 33.5 ohms does not sound like a shorted part on this rail.
2) Remove the battery & adapter. What is the resistance to ground on PL301, pin # 2 ? Checking for a low resistance on this rail due to a short.
3) Do the same measurement for other coils on the logic board.Comment
-
Re: Lenovo G570 shorted vcore
PL301 measures starts from 12mohms dropping 200k then rising up, Pr326 has 5.1ohms, the mosfet pq310 and pq313 resistance is fluctuating,Comment
-
Re: Lenovo G570 shorted vcore
Measure resistance on all coils and report back. Is the resistance fluctuating by a lot? Measure continuity in diode mode across PQ310 and PQ313.Comment
Comment