I live in humid Louisiana. I got my Turbografx from a seller on eBay in 2014. Can't remember which state it shipped from as the ebay link and USPS tracking are long gone, probably somewhere out west if I had to guess. I took a gamble actually. Seller said the RF was poor; this turned out not to be the case. My unit came with an original AC adapter and a very rusty Commodore 64 manual switch. I cleaned the RF out with mineral spirits and plugged in a gold plated RCA-RF plug, and direct-connected the TV coax to my telli set. Picture is honestly among the best of my RF out consoles, comparable to my SNES. There's a very slight amount of bleed on the right-hand edge of bright red objects, less than a pixel in width. In 2015 I bought a very slick looking 3D-printed AV booster alternative for $35 from a dealer on Etsy and I use the composite + stero output from that. Sadly this person no longer sells them. I wish they still did so I could recommend it to folks...
I also keep thinking I want to do the LED mod to the logo. Did you use an LED strip or just single LEDs?
As for the LED mod itself, I bought out my local Radio Shack of white four-pin 3mm LED packages. Wanted 8 but they only had seven so I had to make do with what I got. I later realised I got robbed pretty bad buying all seven square mount LEDs they had, paying $5 each for parts I could have ordered online for 25 cents.
I installed the LEDs on a perfboard PCB and supplied each one with a 100 ohm resistor because I don't trust them to stay in tolerance when parallel connected. The perfboard was cut to size, roughly 1x3.5 inches, and the whole assembly was covered in several layers of black electric tape. The PCB is held onto the case with velcro so it can be repositioned if need be. I used leftover pieces from the perfboard I originally cut to build up a platform for it to rest on so the LEDs didn't poke the backside of the decal. Because the LED board is too thick, I had to cut a rectangular hole in the top side shielding to allow the assembly to fit. I ran the black and red wires and soldered directly to the 7805 regulator. After I installed everything, I looked up a video tutorial on Youtube from Game-Tech
and realized I had way over-engineered my backlight mod. I took photos of it but haven't uploaded them online yet. I'll eventually upload them to a Flickr album and make a thread about it later.