Searching for a Genesis RGB Bypass Board. 9-25-17

[zeruel85]

Tonight I was very sick and could not sleep, so I thought about your configuration.
I think that, since you have not followed my schematics, you have to add a 2.2k Ohms pull-up resistor to the SI line.

You now have two alternative methods:

1) remove the SI wire and resolder the csync pin on the VDP, then solder the wire to the right spot, like you see in my schematics. In this way you use the onboard (motherboard) pull-up.

2) Keep your configuration, but yiu have to add a 2.2k Ohms resistor between SI and 5V.

I am not sure this will resolve all your problems, but I am sure that 2.2k is needed somewhere in the SI line.

Let us know.

[infidelity]

You say I need to add a 2.2kohms between SI and 5v. So are you saying I need to add 2 "2.2kohm's"? for both the SI & 5v?

I didn't realize I would need all these additional items.

But I've never gotten a response to the 7 resistors you told me to remove from the bottom of my motherboard. Do I need to bridge those 7 spots??

[zeruel85]

You say I need to add a 2.2kohms between SI and 5v. So are you saying I need to add 2 "2.2kohm's"? for both the SI & 5v?

I didn't realize I would need all these additional items.

But I've never gotten a response to the 7 resistors you told me to remove from the bottom of my motherboard. Do I need to bridge those 7 spots??

You decided to not follow my schematics (I have never said to lift up the pins of the VDP), that's why you have problems now.

You need ONE (1) resistor BETWEEN SI and 5V (one extreme connected to SI, the other one to 5V). The resistor value is 2.2k Ohm. You can follow one of the two alternative I gave you in the previous reply.

Forget the 7 resistors for now, they are not causing any issues, since, again, you have lifted up the VDP pins.

[infidelity]

OK I was able to restore the vdp si pin. I've soldered the si wire to the spot in your diagram. I've also restored the cut pin 11 on my cxa, and cut pin 10 on my cxa in your diagram. I'll restore the rgb vdp pins, and redo the wiring as in your diagram, and I'll report back.

[infidelity]

Still no video output.

Here are my pics of the fixes.

https://imgur.com/a/BMGzl

I've tested all my fixes with my multimeter, they are all receiving power.

The c sync vdp pin, the rgb vdp pins, are all resoldered to the motherboard, and they have power when I touch the resoldered pins with the positive end of the multimeter.

The newly soldered wires have power going through them, when I test them with the multimeter.

I tested the video output using my model 1 scart cable with the bridged csync wire, and I tested with my 32x, nothing.

I have this setup like zeruel85's diagram now.

Edit: hmmmm, I decided to bridge those 7 sections where I removed the resistors, and I used a multimeter on my rgb spots on the board, and there is significantly more power, originally I was getting 0.01 for my rgb, now it's somewhere in the 2.00 to 3.00 range. I can't test right now cause people are using my hdtv, so I'll try this out asap and report back.

Edit 2: according to my framemeister input led, I'm getting no video input still.

My multimeter readings are...

R1 = 4.89 (also from vdp)
G1 = 4.89 (also from vdp)
B1 = 4.89 (also from vdp)
S1 = 0.09 (also from vdp) (note, 0.09 is when scart is connected, but when scart is not connected it registers as 0.19)

R0 = 2.15 (also from av port)
GO = 2.15 (also from av port)
B0 = 2.15 (also from av port)
5v = 4.95
S0 = 0.09 (note, 0.09 is when scart is connected, but when scart is not connected it registers as 0.19)

The only vdp I have lifted still, (and my system still worked before this mod with it lifted ) is pin 50.

Any ideas why I still have no video? :-/

[infidelity]

Sorry for the bump, really want to get this figured out.

[zeruel85]

Did you cut csync line?
32X does not work with csync buffered, I told you before the purchase. If you want to use it, you have to use the native TTL csync.

[infidelity]

Sorry this is all confusing. What csync line am I cutting? The bridged wire in my model 1 euroscart cable? Forget the 32x for now, I just want to focus on my model 1 euroscart cable.

The only thing I have right now going on with my model 1 euroscart cable, is the bridged wire you had me solder from your diagram. Do I just remove that bridged wire?

And do my voltage readings I posted look ok?

[infidelity]

Wait, are you saying to cut the csync line, as in the trace leading to the csync av port? So that only the csync is coming from pin 42 of the vdp, to your rgb board, to the av csync solder point?

[zeruel85]

I mean pic no. 6 of my diagrams.

[infidelity]

My trace layout is different on my VA2, from your VA1 regarding the cut you show. Do you know what that trace leads to on the CXA?

Can you show me on mine?

https://imgur.com/a/M77sj

Also, ignore pins 10 and 11 in that photo. I now have pin 10 (csync in) cut, and pin 11 (csync out) restored, just like your diagram.

[zeruel85]

Added a pic for you on 'VA2 Model 1 USA' folder.

[infidelity]

I'll cut that trace, and will report back tonight. Thank you!

[zeruel85]

We are here to know if there will be an happy ending.

Hope so dude!