RePCB 2-ASIC (Game Gear)

the repcb is a brand new motherboard i made for the game gear it supports the cleanscreen as the screen (not originals sorry) and any power/audio boards install guide simply transplant your asics, mpu and ext port from the existing console then use either a gameslot or transplant your original cartridge slot over install guide here we recommend purchasing a gameslot to go with this so you don't have to transplant your cartridge port comes with game gear repcb motherboard populated with everything except asics, mpu, cartridge slot and ext port brand new power and audio ribbons cleanscreen ribbons solder paste, stencil and spreader to apply solder paste if you want to hot air asics on features self powered no need for power or audio boards for testing simply plug a usb cable and headphones into the ports on board to fully power up and test the console reset button to reset game, useful for bench testing when powering from onboard usb c japan / english toggle switch, accessible from battery compartment when closed up comes with cleanscreen ribbons for solder free cleanscreen install test points and solder pads for all important signals improved audio with tones never heard before thanks to rerouted traces and a new amp and audio filter circuit change out of reset led so we know if asics out of reset power good led for 5v rail supports original crystal and brand new smd crystal new pcb layout for less noise and cleaner power rails, more accurate data transmissions brand new high quality smd components and an improved pcb design fixing any faults found with the original identifying floating pins some common symptoms we see if certain chips or pins are not soldered well will be listed below address pins on cpu caused by a0 and 5v floating on cpu (and possibly d3/d4 pins too) random colors https //archbee doc uploads s3 amazonaws com/j28kvka0c jxcfzcoqq29 tst7ako0daf9ra5jbmeer 20250711 093119 mp4 identifying faulty chips as these are brand new boards with all new components pre installed the only problems you could have with your system if it doesn't work using the onboard usb port and headphone jack are defect in the new repcb board itself (not had any yet, so most unlikely) bad gameslot connection (highly unlikely) or original cartridge port bad game to test with (clean the pins or use known working game) bad z80 / cpu or vdp or soldering of them (most likely) as you can see, short of rare exceptions such as bad cartridge slots or games, you are most likely dealing with a bad soldering of the z80/cpu/vdp or the chips themselves are dead as we do more and more of these i am going to start making a table of known failed chips and their symptoms and make a graph of the typical chips that fail and their visual output the number after the faulty chip is the number of times i've personally seen it and can confirm that chip there may be many other reports from other users to back this up too, but that number will only reflect the ones i've directly fixed and tested myself true false 122,76,113,80,200false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type false unhandled content type out of reset the out of reset light below the cpu comes on border cleanscreen is showing the black border (meaning it has pclk/hsync and vsync all valid) but screen remains black screen test turning on screen test switch on cleanscreen shows this color (white = all good, red = missing pclk etc see here ) audio game audio can be heard from headphone port bad vdp examples as i come across any visual issues worth noting i will provide examples below here is a failed vdp that gave off vram like errors (noticable blocks of corruption, not single pixel corruption) bad z80 examples when the z80 fails you typically see one of the following solid color screen (black, pink, dull green, cyan etc ) "sega" intro sound (and sometimes nothing on screen, sometimes the game), then the game sometimes loading, sometimes not basically intermittent boot and behaviour