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Hi people, new to these forums :)

But to the point

i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. Today i finally got around to trying to replace the 7805 Voltage regulator, since it had blown up, but that still didn't fix te problem. so now im kinda out of ideas.. so, anyone have any ideas?

Thanks!

Kevin huiskamp wrote

Hi people, new to these forums :)

But to the point

i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. Today i finally got around to trying to replace the 7805 Voltage regulator, since it had blown up, but that still didn't fix te problem. so now im kinda out of ideas.. so, anyone have any ideas?

Thanks!

As you don't specify the Model. I will post about some of them.
Some models have a fuse between VCC and video encoder CXA 1145P, check if your model has this fuse.
If you have a Tec Toy MS2, then this model has a second regulator circuit using a transistor BD135 (T50), a zener diode(DZ1) of 13V and a resistor (R51) Of 330R.
Sometimes just replacing the coupling capacitor on composite video line connected to pin 20 of CXA1145P after a 75R resistor solve this.

Neto wrote

Kevin huiskamp wrote

Hi people, new to these forums :)

But to the point

i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. Today i finally got around to trying to replace the 7805 Voltage regulator, since it had blown up, but that still didn't fix te problem. so now im kinda out of ideas.. so, anyone have any ideas?

Thanks!

As you don't specify the Model. I will post about some of them.
Some models have a fuse between VCC and video encoder CXA 1145P, check if your model has this fuse.
If you have a Tec Toy MS2, then this model has a second regulator circuit using a transistor BD135 (T50), a zener diode(DZ1) of 13V and a resistor (R51) Of 330R.
Sometimes just replacing the coupling capacitor on composite video line connected to pin 20 of CXA1145P after a 75R resistor solve this.

Thanks for responding so fast! the model number is 3006-09 it's the PAL version. i really don't know where to find the chips you said since the numbers of the chips don't match up with the ones you mentiond..

bord.PNG (1.81 MB)

Kevin huiskamp wrote

Neto wrote

Kevin huiskamp wrote

Hi people, new to these forums :)

But to the point

i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. ....

Thanks!

As you don't specify the Model. I will post about some of them.
Some models have a fuse between VCC and video encoder CXA ....

Thanks for responding so fast! the model number is 3006-09 it's the PAL version. i really don't know where to find the chips you said since the numbers of the chips don't match up with the ones you mentiond..

This model does not have composite video output. Using regular AV cable will result in audio only.

This model is RGB only.
Are you connecting this Master System to a RGB monitor or some Type of RGB converter?

Neto wrote

Kevin huiskamp wrote

Neto wrote

Kevin huiskamp wrote

Hi people, new to these forums :)

But to the point

i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. ....

Thanks!

As you don't specify the Model. I will post about some of them.
Some models have a fuse between VCC and video encoder CXA ....

Thanks for responding so fast! the model number is 3006-09 it's the PAL version. i really don't know where to find the chips you said since the numbers of the chips don't match up with the ones you mentiond..

This model does not have composite video output. Using regular AV cable will result in audio only.

This model is RGB only.
Are you connecting this Master System to a RGB monitor or some Type of RGB converter?

Oh well crap, i didn't know it was RGB only I was using a Composite lead from a commodore 64 i guess i'll get a SCART lead and try again, Do the sega genesis model 1 scart cables work on the master system 2?

Kevin huiskamp wrote

Oh well crap, i didn't know it was RGB only I was using a Composite lead from a commodore 64 i guess i'll get a SCART lead and try again, Do the sega genesis model 1 scart cables work on the master system 2?

No, this model requires a specific cable adapter:
"Adapteur R.V.B.", Model 3085 -> http://www.smspower.org/Development/AdapteurRVB

Neto wrote

Kevin huiskamp wrote

Oh well crap, i didn't know it was RGB only I was using a Composite lead from a commodore 64 i guess i'll get a SCART lead and try again, Do the sega genesis model 1 scart cables work on the master system 2?

No, this model requires a specific cable adapter:
"Adapteur R.V.B.", Model 3085 -> http://www.smspower.org/Development/AdapteurRVB

Is that the only way to get any picture out of this thing?
i dont see that whole adapter thing coming with it in the box... right?
can't i do like a direct mod to the motherboard to get any sort of video straight from there?

Kevin huiskamp wrote

Is that the only way to get any picture out of this thing?
i dont see that whole adapter thing coming with it in the box... right?
can't i do like a direct mod to the motherboard to get any sort of video straight from there?

Connecting a Genesis RGB cable direct will result in a Dark Picture because the signal coming from VDP cannot drive a 75 Ohm load.

If you want to use a Genesis RGB cable you can make the RGB buffer inside the Master System. I have added in attachment a schematic which you can build inside the console. You will need three of them one for each RGB component.

Original page with instructions in Portuguese:
http://neto-games.com.br/hardware/sms_tt_rgb.php

sms_tt_rgb_esquema_amplificador[1].png (11.36 KB)

Master System RGB Buffer

Author	Message
Kevin huiskamp Joined: 12 Feb 2017 Posts: 4 Location: Netherlands	No video on Master system II Posted: Sun Feb 12, 2017 3:21 pm
	Hi people, new to these forums :) But to the point i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. Today i finally got around to trying to replace the 7805 Voltage regulator, since it had blown up, but that still didn't fix te problem. so now im kinda out of ideas.. so, anyone have any ideas? Thanks!

Neto Joined: 04 Dec 2016 Posts: 44 Location: Guarulhos - SP - Brasil	Posted: Sun Feb 12, 2017 3:43 pm
	Kevin huiskamp wrote Hi people, new to these forums :) But to the point i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. Today i finally got around to trying to replace the 7805 Voltage regulator, since it had blown up, but that still didn't fix te problem. so now im kinda out of ideas.. so, anyone have any ideas? Thanks! As you don't specify the Model. I will post about some of them. Some models have a fuse between VCC and video encoder CXA 1145P, check if your model has this fuse. If you have a Tec Toy MS2, then this model has a second regulator circuit using a transistor BD135 (T50), a zener diode(DZ1) of 13V and a resistor (R51) Of 330R. Sometimes just replacing the coupling capacitor on composite video line connected to pin 20 of CXA1145P after a 75R resistor solve this.

Kevin huiskamp Joined: 12 Feb 2017 Posts: 4 Location: Netherlands	2 Posted: Sun Feb 12, 2017 7:25 pm
	Neto wrote Kevin huiskamp wrote Hi people, new to these forums :) But to the point i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. Today i finally got around to trying to replace the 7805 Voltage regulator, since it had blown up, but that still didn't fix te problem. so now im kinda out of ideas.. so, anyone have any ideas? Thanks! As you don't specify the Model. I will post about some of them. Some models have a fuse between VCC and video encoder CXA 1145P, check if your model has this fuse. If you have a Tec Toy MS2, then this model has a second regulator circuit using a transistor BD135 (T50), a zener diode(DZ1) of 13V and a resistor (R51) Of 330R. Sometimes just replacing the coupling capacitor on composite video line connected to pin 20 of CXA1145P after a 75R resistor solve this. Thanks for responding so fast! the model number is 3006-09 it's the PAL version. i really don't know where to find the chips you said since the numbers of the chips don't match up with the ones you mentiond.. bord.PNG (1.81 MB)

Neto Joined: 04 Dec 2016 Posts: 44 Location: Guarulhos - SP - Brasil	Posted: Sun Feb 12, 2017 7:47 pm
	Kevin huiskamp wrote Neto wrote Kevin huiskamp wrote Hi people, new to these forums :) But to the point i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. .... Thanks! As you don't specify the Model. I will post about some of them. Some models have a fuse between VCC and video encoder CXA .... Thanks for responding so fast! the model number is 3006-09 it's the PAL version. i really don't know where to find the chips you said since the numbers of the chips don't match up with the ones you mentiond.. This model does not have composite video output. Using regular AV cable will result in audio only. This model is RGB only. Are you connecting this Master System to a RGB monitor or some Type of RGB converter?

Kevin huiskamp Joined: 12 Feb 2017 Posts: 4 Location: Netherlands	Posted: Sun Feb 12, 2017 8:05 pm
	Neto wrote Kevin huiskamp wrote Neto wrote Kevin huiskamp wrote Hi people, new to these forums :) But to the point i bought a MS2 a little while back and it never worked, it doesn't display video (completely black screen) but the audio is fine. .... Thanks! As you don't specify the Model. I will post about some of them. Some models have a fuse between VCC and video encoder CXA .... Thanks for responding so fast! the model number is 3006-09 it's the PAL version. i really don't know where to find the chips you said since the numbers of the chips don't match up with the ones you mentiond.. This model does not have composite video output. Using regular AV cable will result in audio only. This model is RGB only. Are you connecting this Master System to a RGB monitor or some Type of RGB converter? Oh well crap, i didn't know it was RGB only I was using a Composite lead from a commodore 64 i guess i'll get a SCART lead and try again, Do the sega genesis model 1 scart cables work on the master system 2?

Neto Joined: 04 Dec 2016 Posts: 44 Location: Guarulhos - SP - Brasil	Posted: Sun Feb 12, 2017 8:15 pm
	Kevin huiskamp wrote Oh well crap, i didn't know it was RGB only I was using a Composite lead from a commodore 64 i guess i'll get a SCART lead and try again, Do the sega genesis model 1 scart cables work on the master system 2? No, this model requires a specific cable adapter: "Adapteur R.V.B.", Model 3085 -> http://www.smspower.org/Development/AdapteurRVB

Kevin huiskamp Joined: 12 Feb 2017 Posts: 4 Location: Netherlands	Posted: Sun Feb 12, 2017 8:28 pm
	Neto wrote Kevin huiskamp wrote Oh well crap, i didn't know it was RGB only I was using a Composite lead from a commodore 64 i guess i'll get a SCART lead and try again, Do the sega genesis model 1 scart cables work on the master system 2? No, this model requires a specific cable adapter: "Adapteur R.V.B.", Model 3085 -> http://www.smspower.org/Development/AdapteurRVB Is that the only way to get any picture out of this thing? i dont see that whole adapter thing coming with it in the box... right? can't i do like a direct mod to the motherboard to get any sort of video straight from there?

Neto Joined: 04 Dec 2016 Posts: 44 Location: Guarulhos - SP - Brasil	Posted: Sun Feb 12, 2017 9:07 pm
	Kevin huiskamp wrote Is that the only way to get any picture out of this thing? i dont see that whole adapter thing coming with it in the box... right? can't i do like a direct mod to the motherboard to get any sort of video straight from there? Connecting a Genesis RGB cable direct will result in a Dark Picture because the signal coming from VDP cannot drive a 75 Ohm load. If you want to use a Genesis RGB cable you can make the RGB buffer inside the Master System. I have added in attachment a schematic which you can build inside the console. You will need three of them one for each RGB component. Original page with instructions in Portuguese: http://neto-games.com.br/hardware/sms_tt_rgb.php sms_tt_rgb_esquema_amplificador[1].png (11.36 KB) Master System RGB Buffer

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