In interest of not filling the entire front page of the sub-forum with stickied topics, here's my stab at grouping common topics:
Repair Guides: Capacitor Repairs and Replacement Charts
REPAIR GUIDE - Laseractive NEC PAC-N1 / N10: Total capacitor replacement chart
REPAIR GUIDE - PC Engine LT: Total capacitor replacement chart
REPAIR GUIDE - Super CDROM2: Total capacitor replacement chart
REPAIR GUIDE - TG-CD: Total capacitor replacement chart + useful info
REPAIR GUIDE - TurboDuo: Sound Fix
REPAIR GUIDE - TurboDuo/PC Engine Duo: Total capacitor replacement chart
REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
REPAIR GUIDE - TurboExpress: Sound Fix
REPAIR GUIDE - TurboExpress: Total capacitor replacement chart
Repair Guides: Laser Swaps and Adjustments
REPAIR GUIDE - TG16 CD/PCE CD laser swap guide (pictorial)
REPAIR GUIDE - TurboDuo/PC Engine Duo/R/RX: Laser Swap & Adjustment Guide
Modification Guides: Video Upgrades
MOD GUIDE - Universal RGB-to-YPbPr/Component Circuit & Mod [8/24/2014]
PAL turbografx NTSC mod
Modification Guides: Save RAM Upgrades
BRAM upgrade hack
FRAM Duo Mod
The remaining three are all unrelated and will be left separate until there's a need to bundle 'em together:
REPAIR GUIDE - TurboExpress: A/C Adapter Fix
REPAIR GUIDE - TurboExpress: Battery Tray/Connectors
MOD GUIDE - Homemade converters
Any suggestions or better ideas?