My Sega MegaDrive displays Yellow Video. There is no Blue in the video.

[iVirtualZero]

More pics are in this Imgur post: https://imgur.com/gallery/j7OisBw

 

I have a Triple Bypass modded MegaDrive VA4 Model 1. Everything works except the colour blue is missing, i did not have this problem before the recap/reflow. It has a yellow tint. I initially suspected that the RGB pins aren’t soldered on properly on the VDP Chip (315 5313A). I did break the RGB pins afterall. But still managed to solder the wire onto it by further exposing the broken legs with my craft knife. I used plenty of solder, and flux, there is no bridging and it’s not loose at all. I test the system with each pin soldered on individually. Red works (Reminds me of the Virtual Boy), Green works but not Blue. Instead i get a black screen with Blue when i test separately, even though it’s soldered on solid.
 

Other mods include the Region Free chips, DFO accurate 60hz mod both work. The clicky reset button works, replaced the 7805 voltage regulators, i get sound. I’ve also recapped it prior to this problem using the Console5 kit. Could it be the caps? All are installed correctly. Many in the right place. Ps I did make a mistake at first by accidentally soldering in a 7812 which ended up shutting off the system and the VDP chip did get hot. I then quickly shut off the system and desoldered that 7812 that was misplaced in the 7805 packet and soldered in a 7805 and it powered on again.

 

Voltages measured using my Astro Ai Multimeter from the VDP to GND.  I put Sonic 3 in and took the game out at the white Sega Logo before measuring it. Here are the results. 
Red= 3.135v
Green=3.255v
Blue=3.438v

 

I followed this guide for the Triple Bypass mod, more pics from the guide are below: https://www.retrorgb.com/genesis1rgbbypass.html

https://console5.com/techwiki/images/f/fb/CXA1145PM.pdf

There is also this guide, did not follow this since i have the Triple Bypass: https://videogameperfection.com/2018/08/28/megadrive-bypass-installation/

 

Is the console/VDP at fault or is it the mod such as the Triple Bypass board? And can this be fixed?

Edited September 26, 2021 by iVirtualZero
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[iVirtualZero]

Fault has been found, the Triple Bypass mod is screwed. Will be switching it out. I soldered Blue to Green and i’m getting video. 

On 9/26/2021 at 7:36 AM, iVirtualZero said:

More pics are in this Imgur post: https://imgur.com/gallery/j7OisBw

 

I have a Triple Bypass modded MegaDrive VA4 Model 1. Everything works except the colour blue is missing, i did not have this problem before the recap/reflow. It has a yellow tint. I initially suspected that the RGB pins aren’t soldered on properly on the VDP Chip (315 5313A). I did break the RGB pins afterall. But still managed to solder the wire onto it by further exposing the broken legs with my craft knife. I used plenty of solder, and flux, there is no bridging and it’s not loose at all. I test the system with each pin soldered on individually. Red works (Reminds me of the Virtual Boy), Green works but not Blue. Instead i get a black screen with Blue when i test separately, even though it’s soldered on solid.
 

Other mods include the Region Free chips, DFO accurate 60hz mod both work. The clicky reset button works, replaced the 7805 voltage regulators, i get sound. I’ve also recapped it prior to this problem using the Console5 kit. Could it be the caps? All are installed correctly. Many in the right place. Ps I did make a mistake at first by accidentally soldering in a 7812 which ended up shutting off the system and the VDP chip did get hot. I then quickly shut off the system and desoldered that 7812 that was misplaced in the 7805 packet and soldered in a 7805 and it powered on again.

 

Voltages measured using my Astro Ai Multimeter from the VDP to GND.  I put Sonic 3 in and took the game out at the white Sega Logo before measuring it. Here are the results. 
Red= 3.135v
Green=3.255v
Blue=3.438v

 

I followed this guide for the Triple Bypass mod, more pics from the guide are below: https://www.retrorgb.com/genesis1rgbbypass.html

https://console5.com/techwiki/images/f/fb/CXA1145PM.pdf

There is also this guide, did not follow this since i have the Triple Bypass: https://videogameperfection.com/2018/08/28/megadrive-bypass-installation/

 

Is the console/VDP at fault or is it the mod such as the Triple Bypass board? And can this be fixed?