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Discussion Starter · #1 ·

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The keyboard works on a matrix principle. There are rows and columns and it would appear one vertical column is malfunctioning. There is a slight possibility that you can try to reseat the keyboard cable inside the laptop. I'm sure you can Google disassembly instructions for your model. Often the cable is folded up underneath the keyboard. Sometimes there is a pressure lever to release the cable, other times it just plugs into a connector. You could try to unplug it and plug it back in once or twice, then see if the keys work. If not, sonexpc is right and you will need to replace it. At least at this point you will know how to do so.
 

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You can find replacement keyboards on eBay at reasonable prices. Just stick with a top-rated vendor. These days, that's where I get most of my laptop parts and many printer parts.. HP most likely has a downloadable service manual for your computer. It isn't particularly hard to service a laptop, you just have to be a little careful with the connectors. Other than a set of jeweler's screwdrivers, you don't need special tools.
 

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A couple, but both involve the main board. It could be the connector itself, either poor electrical connections in the connector or a cold or loose solder joint where it's mounted to the board. Or, it's possible it's the keyboard controller. Not really a user replaceable component ...
 

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I unplugged/plugged the keyboard cable to the motherboard and made sure that is connected properly. and still the 3 keys are not working, seems like its diagonal keys (i,k and , ) I also checked the num key and confirmed that's set properly.

you think i should dissemble the motherboard and try again
 

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Unless you know about soldering surface mount connectors, I'm not sure there's a lot you can do. And it still might be the keyboard controller (probably integrated into a chip with several other functions).
 

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The keyboard controller is the part of the motherboard that interfaces with the keyboard, processes the signals. It is likely built into an integrated circuit (IC) along with other I/O functions. It's not a user-replaceable component.
It's looking like you need a main board, but that is a major undertaking. You can probably find used or refurbished boards for about $100, give or take.
 
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