7811- busted power supply.

hi need some help. I'm in Asia on a project for some months. i was watching a DVD on the 7811, end of which i saw there was no light on the adapter and no power. so i took it to a local computer shop. the guy came up with an original gateway adapter. specs, weight, size were exact same with a few minor differences.
first it said gateway lite-on. there were 2 pins coming into the adapter instead of 3. the guy said that's because its a pro model and mine was for home users. efficiency was 3 compared to 4. 110-240v, 19v, 6.32a were exact same. but no where on the original or the new one did i find the 130 w rating, where is that??
the guy was more interested in the 6.32a and didn't seem to know about the 130w or about the targus adapter. it worked on my computer but i did notice the new adapter get a little warm within 2 mins of boot up.
so i didn't get it cause i don't think it can handle a gaming session. the old one is at the shop to see if it can be repaired. options please.

 

You should've listened to him - the 6.32a value is the input amperage, which is the key figure you need to worry about when matching adapters after the voltage parameters. Matching voltage is easy, but it's the input amperage that makes each adapter unique to their various systems. The 130w is just the maximum Watts capability of the adapter (full load capability). As long as you can match the voltage and input amps, you're good to go. I'd trust that rather than a "fixed" adapter as you really need the right tools to fix modern electronics. It's unlikely that he didn't know about the wattage value, he just knew it didn't matter as long as it matched or exceeds your original adapter capability.

 

Actually 6.32 amps is probably output voltage (W=VxA) or 19x6.32=120. The original for my 7805u which i believe is the same unit as the 7811 is also 19x6.32 or something reallly REALLY close and is also 120w adaptor. Lite on is a major ODM of laptop power supplies and I would think the replacement you got is fine. If it lists the input voltage and amperage range you can also determine the efficiency, it will take more than 120W AC in to get 120W DC out, how much more tells you how efficient it is.

 

thnks. i was just concerned about the total output during heavy load and if the new adapter can handle it. since he said its a pro model, i thought its built for a business machine and may not be able to handle the 9800 gts under load. i know i saw the 130w somewhere, just don't know where now.