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, for 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. 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.
I have a 3d printer and I can design a new lamp housing for the led and optics that can fit perfect in the projector.
If the project can be done, the next step is to try to make a dynamic lighting using a programmable power Supply and an arduino, like a dynamic iris but controlling the led power. I have a friend that could help me with this. But it's secondary, only with the led mod I would be happy
The projector were not disassembled yet, according to the JVC service manual the ballast P/N is PC023411199 and looking in google alternative P/N are QAL1459-001 or MPL3120E.
Is there someone with experience in modifications on JVC projectors? Any suggestions will be greatly appreciated
Post by mastertech on Apr 19, 2020 12:24:31 GMT -5
Ok, I have that already. I thought maybe you had found something better. Without a schematic or a more specific wiring diagram there is no way to help with your question. Unless one of the 2 boards(ballast or connecting board) connectors are marked as to what they are.
Few days ago I could take the projector. 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 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 done the code for do the dynamic lighting , 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 , finally no arduino was needed, only the 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
lfcfan: Hi Todd, have been reading endlessly about the topic, and I really don't think that I'll be capable to 1. do the job myself as I don't have enough of the right equipment, and it looks like only the people who have access to TI exclusive distribution networ
Apr 9, 2020 17:17:06 GMT -5
skydronelink: Thank you I advance
Jan 29, 2020 4:01:41 GMT -5
skydronelink: Hi Repairaj, I have the same issue, but I am not able to get the cap value, I can tell it is the same board but deffirent rev cause of the side CAP is not the same value ! any idea how I can get the right burnt cap value?
Jan 29, 2020 4:01:31 GMT -5
skydronelink: Hello Jerme, thank you for the those images, is there is any chance to get the C2 (Cap) value or an image for it ? Thank you in advance.
Jan 27, 2020 23:15:06 GMT -5
skydronelink: Hello Sergio, I have the same issue, but I am not able to get the cap value, did find out what is the cap value?
Jan 26, 2020 18:01:17 GMT -5
jbmeyer13: Wolfy's Marquee isn't working? Did you spill a pint on it and short the MB?
Apr 25, 2019 8:32:28 GMT -5
wolfman: Always the same sarkasm Kurt that's why I never checked in until now. I knew you wouldn't give me a cheerful answer so let you hang for a while. Removed the last part you probably are a decent guy Eye to Eye.
Apr 19, 2019 18:55:30 GMT -5