Member Avatar for slackda

hiya,

hope i can get some advice on this.

ive got a sony vaio pcg-k115b

and nothing is happening when i plug in the charger no lights flashing absolutly zilch.

ive tested the psu and im getting current through it and i have tested various places on the board and i am getting a current running round the board, but still no charing lights........

it just stopped working was fine and then next day nothing.......

i thought it may have been the switch but having already tried another switch with no luck im out of ideas other than a dreaded motherboard failure :twisted:


is it possible the CPU has become unseated and is stopping the boot up/charging?

please any help or ideas would be great

thanks

slackda

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Dani AI

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Good follow-ups to the checks already done by and — next steps should focus on the DC‑in area and the first power rails on the motherboard rather than the CPU.

Start with simple, safe checks: remove the main battery and try AC power only; press and hold the power button for 20–30 seconds with everything disconnected to discharge caps, then plug AC in again. Inspect the DC jack for loose pins or broken solder pads and wiggle it while watching for any LED activity. Look closely (magnifier) for burned components or bulging/leaking capacitors around the jack and power delivery area.

Use a multimeter to verify continuity and shorts on the input rail (with power removed). Check the small SMD fuse(s) near the jack for continuity and measure resistance between the input rail and ground; a very low reading indicates a shorted component downstream. If comfortable with a bench supply, use it with a low current limit and slowly bring voltage up while feeling for a component that warms quickly — that will point to the failed part (common culprits: input fuse, reverse-protection MOSFETs/diodes, charging controller IC, or swollen caps). Replace fuses or the DC jack first if they’re obviously faulty; these are inexpensive and often fix “no lights” faults.

About the CPU: an unseated processor is an unlikely cause on most Vaio models of this era because the power system fails before the CPU has any role in initial power-present behaviour. Only reseat the CPU if the model actually uses a socketed CPU; consult a service manual to confirm. If board-level diagnosis is unfamiliar, a shop with a bench PSU and schematic will usually locate a blown power component faster and more safely than trial-and-error.

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Member Avatar for TT4Titans

Okay first what is the voltage you are getting through your power cord.look on the box on the cord and see what the output is.then take your Multi meter set to DC and test the end that plugs into your laptop and see that it is putting out what the output power is.

testing and getting voltage is one thing but getting proper voltage is another.

Member Avatar for slackda

ok tested and getting 19v through the psu and into the board, but nothing on the board now, i know that there is a current flowing round the board but there is no voltage......even on the lowest setting on the multi meter.....

any thougths on what i shoudl try now?

do i need the processor plugged in to complete the circuit?

thanks''slack

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