These 1993 Fender American Standard pickups sounded tinny, and I didn't know why. It had the TBX tone control on the left, and a regular 250K tone pot for both tone and volume. I noticed the the neck tone pot didn't do anything, and the TBX tone control had some large tonal bumps throughout, so I decided to simplify and replace all of the pots with new 250K pots. It worked! Good learning experience for me.
Project guitar - replacing pots (Before shot)
Project guitar - replacing pots (After shot)