Thanks for reading , so i got me one of those spongebob 13 inch crt tv, that i would like to do the rgb mod mostly as i want to put 2 crt monitors together to create a mini punchout cabinet. Ive allready tried to mod one of those winnie the poo tv and failed, so ill be more carefull on this one.
The bad news is that this is not the same model as the original rgb mod done here
https://tinkerplunk.wordpress.com/spongebob-tv-rgb-mod/as it has some diferences, but it comes pretty close to the other model.
Main diferences are as shown in this picture are:
Also i dont have the osd source chip , rather i have one small one at the bottom
M37150M8
and the other chip,jungle chip , its the same one
140398-DI2
So acording to his instructions,
Quote:
From these I was able to trace the RGB and blanking lines, where I removed the inline resistors.
So i think i need to remove the resistors at 262,263 and 264 and 265 right? he didnt have them so he just removed the jumpers i guess?
then he said
Code:
I then used a schematic provided by Syntax on the shmups forum to replace the resistors with values that would allow me to mix in the RGB from the RCA jacks with the OSD signal without losing the OSD or requiring the use of a switch.
He still talks about the same resistors right? and acording to his schematich he added 2.7k for the rgb and 180 for the blank right?
If so, for me would be just replacing the existing resistors.
then he said:
Quote:
I replaced the existing blanking resistors with the values from the schematic, and then just put a wire from a 5V signal on the board to the non-ground leg of the grounding resistor.
Thats were the 180 resistor will go.
Plus adding the 5v line
Then:
Quote:
I replaced the in-line OSD resistors. I then put one leg of 75 ohm resistors 2 ground and pointed them up out of the board, then put the inline resitors of the external signal into the other side of where the original grounding resistors were, mixing with the OSD, and then going through the existing 0.1μF caps into the jungle chip.
So this one as he states, i just should add 75ohm resistors terminated to ground
but since i dont have resistors there on my chassis, what kind or resistors should i add? non? or should i add the ones i removed from ther other place? or perhaps the same value ones as he did 360ohm according to his schematic
Thanks for reading and hope someone will point me in the right direction, thanks.