Turbo Grafx-16 and Jrok, why can't they get along?

[Lios]

I am having a problem that I am hoping someone on these forums can help me solve. You see, I have a Jrok v4.1 RGB to component encoder that I would like to use to convert the RGB from my TG-16 into component for use on a LCD TV. I have tapped the red, green, blue, ground, audio left, audio right, and composite video lines from the expansion port. I used a LM1881n to strip the sync out of the composite signal and have connected it properly (with the two caps and resistor), the rest of the signals are going straight to  a 8-pin din. I then connect this din to my encoder which works flawlessly with my genesis, master system, supergun, and snes, and nothing, just the audio. My guess is that it is not syncing. I have tried building the amp on the gamesx site, using the 2sc1815 by itself, and putting 1 microfarad caps on each of the RGB lines, none of which did anything. Anyone here who has gotten the TG-16's rgb to work via a JROK encoder mind giving me a schematic of exactly what should be connected to what and what parts you used? I can't figure out why it won't work...

[NFG]

Jrok's encoders don't work with the NEC equipment.  I've talked to him about it but didn't have the spare gear to send him back when he offered to check into it for me.  For fun, here's a picture of my work on the identical project you're attempting:

[Lios]

Hmm.. I did read that a user by the name D-Lite on the pcenginefx.com forums was able to get it to work on a Jrok encoder by using the composite sync and a Lm1881n:

http://www.pcenginefx.com/forums/index.php?topic=3486.0

However, he wasn't very specific on how he did it or what exactly he did other than using a lm1881n and unfortunately he is very busy as of late. Someone else must have gotten it to work. If not, then that really sucks, I really wanted component on my TG-16 without buying another encoder

[phreak97]

i think this is what youre after:)
http://www.gamesx.com/misctech/lm1881.htm
(ignore pins 3, 5, and 7, theyre for other uses)

lm1881's are available as free samples from national.com.. order a few just in case:P shipping was free last i checked too. (lm1881n is the mdip package, which is easy to solder, order those)

[RGB32E]

I am having a problem that I am hoping someone on these forums can help me solve. You see, I have a Jrok v4.1 RGB to component encoder that I would like to use to convert the RGB from my TG-16 into component for use on a LCD TV.

These units play nice with NEC systems:
http://search.ebay.com/search/search.dll?from=R40&_trksid=m37&satitle=SCART+COMPONENT+converter&category0=

They also work well with the SNES and PSX (the only 3 systems I've tried so far).  The euro connector can easily be desoldered and the inner PCB can be removed easily as well.

I just need to build myself a suitable RGB amp for the turbo systems.  I have one of the Atlona re-branded converters and it works with the TG16 no strippers needed... the picture is much darker than I'd like...   

[Lios]

No offense phreak97, but did you even my first post? I know I need a lm1881, in fact I stated in my post above that I used a lm1881n in my circuit and that I hooked it up a per the page you linked to. That is why I am perplexed as why it doesn't work. Any ideas? Anyone?

@ RGB32E
Thanks for the info, but unfortunately I have already invested $75 into the jrok and sync cleaner. I am hoping to be able to get it to work without spending too much more or buying another encoder.

[duo_r]

Did you ever get it to work? I have read that the component only version works just fine for the Duo.

[Blaine]

One note about doing this, you need to get the sync signal off of the composite video output, not from the #44 pin on the processor.  And you need to strip the signal, in my case with the LM1881.

You said you took it from the expansion port though? I'd say "I don't think it makes much difference" but... probably worth the 3 minutes it'll take to try it out.

[duo_r]

So you tried without an amp? Were you able to test the RGB image on a monitor prior to trying out the JROK? I have read several posts about getting it to work. I also emailed someone from the pcenginefx forums that I know got his to work to see if he can reply to this thread.

UPDATE: Wait, I think I found your problem. You tapped from expansion port right? See this response I got from the pcengineforums:

It's more of a combo of not knowing the chip it originates from and my laziness of tracing it. I am sure that if i tap it from the source it will be perfectly loud. I had similar problems with tapping the rgb and sync lines from the expansion bus, very weak signals. But from the source, no amps necessary.

ORIGINAL MESSAGE:

I am having a problem that I am hoping someone on these forums can help me solve. You see, I have a Jrok v4.1 RGB to component encoder that I would like to use to convert the RGB from my TG-16 into component for use on a LCD TV. I have tapped the red, green, blue, ground, audio left, audio right, and composite video lines from the expansion port. I used a LM1881n to strip the sync out of the composite signal and have connected it properly (with the two caps and resistor), the rest of the signals are going straight to  a 8-pin din. I then connect this din to my encoder which works flawlessly with my genesis, master system, supergun, and snes, and nothing, just the audio. My guess is that it is not syncing. I have tried building the amp on the gamesx site, using the 2sc1815 by itself, and putting 1 microfarad caps on each of the RGB lines, none of which did anything. Anyone here who has gotten the TG-16's rgb to work via a JROK encoder mind giving me a schematic of exactly what should be connected to what and what parts you used? I can't figure out why it won't work...

[Lios]

Wow I had completely forgot to update this post. I got it working many months ago by tapping the signals directly from the huc6260. No need for any amps, perfectly bright sharp image.

I post more often at pcenginefx.com under the moniker Zeon. In fact that response from pcenginefx.com was from me  . Kinda funny how that happened.

Thanks for the help anyways duo_r.

So you tried without an amp? Were you able to test the RGB image on a monitor prior to trying out the JROK? I have read several posts about getting it to work. I also emailed someone from the pcenginefx forums that I know got his to work to see if he can reply to this thread.

UPDATE: Wait, I think I found your problem. You tapped from expansion port right? See this response I got from the pcengineforums:

It's more of a combo of not knowing the chip it originates from and my laziness of tracing it. I am sure that if i tap it from the source it will be perfectly loud. I had similar problems with tapping the rgb and sync lines from the expansion bus, very weak signals. But from the source, no amps necessary.

ORIGINAL MESSAGE:

I am having a problem that I am hoping someone on these forums can help me solve. You see, I have a Jrok v4.1 RGB to component encoder that I would like to use to convert the RGB from my TG-16 into component for use on a LCD TV. I have tapped the red, green, blue, ground, audio left, audio right, and composite video lines from the expansion port. I used a LM1881n to strip the sync out of the composite signal and have connected it properly (with the two caps and resistor), the rest of the signals are going straight to  a 8-pin din. I then connect this din to my encoder which works flawlessly with my genesis, master system, supergun, and snes, and nothing, just the audio. My guess is that it is not syncing. I have tried building the amp on the gamesx site, using the 2sc1815 by itself, and putting 1 microfarad caps on each of the RGB lines, none of which did anything. Anyone here who has gotten the TG-16's rgb to work via a JROK encoder mind giving me a schematic of exactly what should be connected to what and what parts you used? I can't figure out why it won't work...