Replaceable fuse inside the 170w power supply?

W530/W540 series specific matters only
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Replaceable fuse inside the 170w power supply?

#1 Post by my03 » Thu Apr 13, 2017 8:51 am


got my W530 home today. It was in mint condition and came with the 2.7ghz quad core cpu, 8gb of 1600mhz ram, 500gb drive and..... not working power supply (which was cosmetically great also).

I have contacted the seller already regarding this, but i'm still curious: do the power bricks contain any fuse inside? I measured the tip of the cable going into the back of the W530 and there was no voltage whatsoever coming out of the power supply.
W530 w.3740qm, 8gb, 240+120gb ssd, 1980x1080
T410 w. I7-640m, 8GB, 240+128gb ssd hd, 1440x900
X61 w. T7500, 8GB, 240gb ssd, 1024x768 (middleton bios)
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Re: Replaceable fuse inside the 170w power supply?

#2 Post by axur-delmeria » Thu Apr 13, 2017 10:57 am

There's a fuse inside most laptop chargers/AC adapters, usually rated for 240v maybe 2 or so amps (can't remember exactly :? ), but it's soldered to the circuit board rather than in a fuse holder.

Also, use the multimeter's continuity test mode on the detachable power cord. Sometimes the problem lies there.
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Re: Replaceable fuse inside the 170w power supply?

#3 Post by Snowflake » Tue May 02, 2017 9:43 pm

There is a relative easy way to convert an ordinary power charger, as small as 65 W, to work with the W540. I saw that on Lenovo forums, or maybe here. Basically you order an adaptor for a few bucks from the charger round plug to the square power connector format. Open up the square plug in the adaptor and take out the resistor and replace it with a 1,800 ohm resistor. It is recommended to use a 90W or 130W charger.

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Re: Replaceable fuse inside the 170w power supply?

#4 Post by rkawakami » Wed May 03, 2017 6:37 pm

While substituting the resistor inside the connector is a means to fool the laptop into thinking it is connected to a different (usually, higher power) AC adapter, I would NOT recommend doing this. The adapter may not be able to supply enough current to charge the battery and operate the computer at the same time. You could be operating the adapter past its design limits. That may lead to an overheating condition and possibly a fire.
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