u/Gameater

After my post yesterday I have successfully installed an S-Video mod into the Sharp 14G-SF1 (a CRT with a Super Famicom built in), whilst keeping all features of the TV functional. Normally this TV only has a RF and Composite input, with S-Video solely being reserved for the internal SFC.

The way it works is by tapping into the internal S-Video input of the Super Famicom, and uses 2 switches to toggle between the SFC and external S-video input. Audio is provided by tapping into the existing Phono audio port used for the composite input.

The TV will only display S-Video when a 12v circuit is completed whilst the SFC power button is in the on position. Therefore this mod is wired to maintain the 12v circuit, but disconnects the power to the SFC when in external S-video mode. As a result the main SFC power switch turns more into a S-Video mode switch.

I have made a very crudely drawn diagram (which took me way to long to make) if anyone decides to complete this mod themselves.

Due to the lack of documentation on this very niche set up (apart from 1 post on the UltraPIF GitHub from 2020 asking if it would work), I just wanted to let anyone who was wondering know that installing an UltraPif in a PAL N64 will not make it work with the 64DD.

Edit:

Although just normal 64DD games don't work, I can confirm the F-Zero X Expansion disc does in fact work fine. I believe this is due to it booting the game off the cartridge rather than disc.

I'm fixing up a Sharp 14G-SF1 (14-inch CRT with SNES built in) and completely stumped on how to fix this EXT LATCH fail error. Looking at some repair videos, I have seen that this should be possible to fix.

So far, I have swapped the CPU, PPU's, S-WRAM, Video RAM and recapped the console. (I've included a photo with the chips I have replaced circled and they were working on the donor SNES) There is continuity between the PPU 2, CPU and line leading to the controller ports.

The components are the same as the traditional SNES, with a different layout, so even if you have experience fixing this issue on traditional SNES, I'll still be keen to hear how you did it

After finding out these existed at a gaming museum in Korea, I managed to pick this up relatively cheaply with the caveat that the inbuilt SNES was not working and a slight purple hue at the top of the screen.

After replacing the RAM and PPU’s of the SNES and conducting a full recap of the SNES and TV, the picture seems to look as it should (although I still need to recalibrate the projection), the sound is louder and clearer and the SNES is now up and running, with the Super Gameboy test working flawlessly.

Only issue I’m facing is that when performing a Burn-In test I get an EXT LATCH FAIL error, however some research shows that the EXT LATCH is wired slightly differently on this TV compared to a standard SNES console. I know it isn’t the PPU as I tested it before swapping the chips and it all cleared.

Has anyone else with this TV tried this test before? I'm trying to figure out I’m attempting to fix an error which is just normal for this TV.

In an ideal world, I would have installed a SuperCIC mod to the SNES, as I am based in the UK, but from testing with the AV connection, it seems like the TV does not accept PAL video signals (black and white, scrolling picture). As the internal SNES uses S-Video, rather than RGB, I’m guessing I will get the same video issue if I was to install the SuperCIC mod.

From research, I cannot find any information about the Sharp IX1764CE jungle chip, so I’m guessing RGB modding isn’t possible (or well above my skillset if it is).

Albeit it is a neat little TV, making me want to pick up the 21-inch version, but I unfortunately cannot justify spending more on shipping than the TV itself.

Anyone else play around with this TV?