CurtPalme.com Home Theater Forum

Harcoreta · Joined: 04 Apr 2020 Posts: 3

Im new in this amazing forum Smile

I have a JVC RS46 (same model as X35), and I'm planning if it's possible a modification for bypass the ballast security control, and I could use an external light source. There are now high power leds (50W or 100W) and with the right optics I hope it could work, I would like to fill a 145"-150" screen Smile

I'm using now an EPSON TW9000 with a LPE filter with good results, but I would like to use the JVC in the same room.

Is there someone with experience in modifications on JVC projectors? Any suggestions will be greatly appreciated Smile

regards!

**AnalogRocks** · Posted: Sun Apr 12, 2020 6:07 pm Post subject:

There was a guy on here that started his own forum after a falling out some years ago. He would be the right man for the job. His handle is Mac.

Anyone remember the www for Mac's forum?

**kal** · Posted: Mon Apr 13, 2020 12:13 am Post subject:

<link removed>

Kal

**AnalogRocks** · Posted: Mon Apr 13, 2020 2:19 am Post subject:

Harcoreta · Joined: 04 Apr 2020 Posts: 3

Thank you guys!!!

I could see an interesting thread about repairing a JVC ballast.

I'll post an update if the modification project starts.

**AnalogRocks** · Posted: Wed Apr 15, 2020 7:31 pm Post subject:

Harcoreta · Joined: 04 Apr 2020 Posts: 3

Ballast bypass done! Smile

Few days ago I could take the projector, it was in my parents home. And past weekend I disassembled the projector and connect a logic analyzer to the ballast. I was looking for a communication protocol over serial ttl that is now present on new projectors, but in this model is using discrete signals only. I did a short circuit on the optocoupler that carry the lamp status signal and It worked, the projector works perfect without a lamp, power connector on ballast was also removed. Tested with a 3W led, the luminance is too low, but enough to check that it works Smile

I've attached the possible short circuits you can do for do the bypass, on the control board or on the ballast, I did the short circuit on the optocoupler because it's easier to solder, the connectors and pins are very small.

I also have planned to do dynamic lighting, like a dynamic iris but controlling the led power. The code is also done Smile

. I bought a cheap programmable power supply (DPM8608), and with the ffms2.dll plugin that works with avisynth you can log to an archive the average luminance in the scene. I did a simple script in powershell to take that information and send the desired voltaje command to the power supply. I suppose the code can be improved, I'm not a programmer, but it works very well Smile

, I used only a computer with a usb serial ttl. Possible It will be the first cheap JVC projector (not dla-Z1) with ∞:1 contrast xD

Now I'm anxious waiting for the high power leds. I bought 100W and 150W and hope to be enough, next step build the new led housing Smile

Regards

pureaudio · Joined: 29 Mar 2015 Posts: 37

**kal** · Posted: Mon Nov 16, 2020 3:59 pm Post subject:

As a general rule I don't have any issues with people posting links to elsewhere as long as they're not spamming sales-type posts. (i.e. "Click here to buy bitcoins!" type stuff).

You'd probably have to ask Curt. It may be because the person who runs that other site left here on bad terms.

Kal

pureaudio · Joined: 29 Mar 2015 Posts: 37

**Curt Palme** · Posted: Mon Nov 16, 2020 6:49 pm Post subject:

**kal** · Posted: Mon Nov 16, 2020 7:22 pm Post subject:

pureaudio · Joined: 29 Mar 2015 Posts: 37

**Curt Palme** · Posted: Mon Nov 16, 2020 9:30 pm Post subject:

No.

pureaudio · Joined: 29 Mar 2015 Posts: 37

Argumentative OT post against the website owner and mods removed. Please stay [at least reasonably] on topic and be nice to others. See the forum rules. Thank you. - Mods

pureaudio · Joined: 29 Mar 2015 Posts: 37

Second argumentative OT post removed

**kal** · Posted: Tue Nov 17, 2020 2:44 pm Post subject:

PureAudio: You're not posting a link to where you previously explained to us who you are as promised. Clearly there is no previous post you can link to as you mentioned as there is none (you only have 21 posts so it's simple to check). You are simply bitching and complaining and posting thoughts from others you may have read on other forums. We don't need that here. It serves no purpose.

So never mind, as you don't have a post to link to. Please drop it and stay on topic, and be nice to others.

Kal

pureaudio · Joined: 29 Mar 2015 Posts: 37

**kal** · Posted: Tue Nov 17, 2020 4:23 pm Post subject:

You don't need to post anything.
Curt has indicated he doesn't want you linking to that other forum so it shouldn't be done by anyone.
I've now gone through this thread and removed all mentions of that forum to avoid confusion.

Kal

pureaudio · Joined: 29 Mar 2015 Posts: 37