While playing songs, suddenly, sound on the right side internal speaker is dead but another -left side speaker is working, now only one speaker is producing sound. If I check it using headphone, sounds on both sides (left and right side) are coming. Please let me know what the reason it is.

Both channels in headphones are working and it means the laptop sound card is working correctly.

Most likely your problem is related to the right speaker failure. Apparently, the right speaker went bad and has to be replaced.

In order to replace the faulty speaker it’s necessary to disassemble the laptop, remove the top cover, unplug the faulty speaker from the motherboard and replace it with a new one.

I’m fixing my girlfriends Toshiba Portege A100 and the fan is dead is there anywhere online where I can order a new fan besides Toshiba (i.e. non genuine parts or second hand ). Thank you for your time.

I had to repair Toshiba Portege A100 only 2 times. First time I replaced the hard drive and second time I replaced the fan. That’s a lot of work, because you cannot access the fan from the bottom of the laptop or even if you remove the laptop keyboard. The fan is located on the bottom of the system board and you have to remove the board in oreder to replace the fan. You’ll be surprised, but I have created a guide for replacing the cooling fan on Toshiba Portege A100. The hardest part was finding a new fan. This model is not sold in the USA so I had to find an equivalent. I found that Toshiba Portege 3500 should work fine, and it did. That’s the same fan. Here’s a part number for Toshiba Portege 3500 fan: P000363930. You can search for this part number on eBay or just Google for it.