Optoma EP721 Ballast Bypass

ep721guy · 26th April 2009, 12:48 AM

ok so i read up on some of the other threads in regards to this topic. So i tried it, here is the outcome

Removed ballast and found 5 small wires going to board from ballast. I disconnected this set of wires and ground each pin to see which would leave pj on and by pass the ballast.

Pin 1 = No Lamp error code
Pin 2= PJ stays on, color wheel spins, looks like its working but no picture and then gives Replace Lamp error code.
Pin3= Same as pin #1
Pin4= Nothing. Power light comes on but does nothing else, when i remove the ground PJ starts up and then No Lamp error code again.
Pin5= Same as Pin #1

When i do ground Pin 4 after PJ powers up i see a very slight spark and then the PJ stops everything but stays powered on......

Anyone have any similar outcomes. Any better ideas? Now this is all grounded, do you think i have to jump Pins 2 and 4 together instead?
Please help!!!!!

tjh · 26th April 2009, 02:06 AM

One other thing to note is that some projectors use electronic sensors to detect whether or not there is light. I've only seen it on a few, but maybe that could be an issue?

ep721guy · 26th April 2009, 05:07 AM

Yeah I already tried that too. I used an external power supply and installed the original lamp housing and new alt source lamp figuring it had to sence a light to go but to no avail.

xwave · 2nd February 2012, 01:18 AM

i face the same problem.

it happened when i change the new OEM bulb. The bulb is tested to other projector (different brand and model) and work well.

26th April 2009, 02:06 AM	#2
tjh diyAudio Member Join Date: Dec 2004 Location: RI, USA	One other thing to note is that some projectors use electronic sensors to detect whether or not there is light. I've only seen it on a few, but maybe that could be an issue? __________________ 6/12/06: Redesigning everything, finally putting in the Ushio S400DD.

2nd February 2012, 01:18 AM	#4
xwave diyAudio Member Join Date: Oct 2011	bypass optoma ep721 ballast i face the same problem. it happened when i change the new OEM bulb. The bulb is tested to other projector (different brand and model) and work well.

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26th April 2009, 12:48 AM	#1
ep721guy diyAudio Member Join Date: Apr 2009	Optoma EP721 Ballast Bypass ok so i read up on some of the other threads in regards to this topic. So i tried it, here is the outcome Removed ballast and found 5 small wires going to board from ballast. I disconnected this set of wires and ground each pin to see which would leave pj on and by pass the ballast. Pin 1 = No Lamp error code Pin 2= PJ stays on, color wheel spins, looks like its working but no picture and then gives Replace Lamp error code. Pin3= Same as pin #1 Pin4= Nothing. Power light comes on but does nothing else, when i remove the ground PJ starts up and then No Lamp error code again. Pin5= Same as Pin #1 When i do ground Pin 4 after PJ powers up i see a very slight spark and then the PJ stops everything but stays powered on...... Anyone have any similar outcomes. Any better ideas? Now this is all grounded, do you think i have to jump Pins 2 and 4 together instead? Please help!!!!!

26th April 2009, 05:07 AM	#3
ep721guy diyAudio Member Join Date: Apr 2009	Yeah I already tried that too. I used an external power supply and installed the original lamp housing and new alt source lamp figuring it had to sence a light to go but to no avail.

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