Proxima 6500x Lamp Fooling (In focus LP650) - diyAudio
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Old 1st April 2012, 03:50 AM   #1
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Default Proxima 6500x Lamp Fooling (In focus LP650)

Im trying to fool a Proxima 6500x aka infocus LP650 into thinking that the bulb is there. its burnt out and i want to replace with an led. the mother board has a 16 pin cable connecting the Main PSU for the unit and the ballast for the light to it. the Ballast and ballast control circuit has been removed aswell as original lamp. There are 6 ballast control wires;

Red--+5v into sender opto cathode plus others
Green--signal back to MB from opto
Blue--Signal to Ballast
White-- no noticable connections
Black--0v annode on 2 recieving optos on ballast

What wires do i connect to trick it into thinking theres a lamp working?

Ive tried;

Green--Red connection.
Green--Black connection.
Red--Black connection.

...none made a change in anything. it tries 5 times to spark lamp with no luck then flashes one red light for the correct error code.

about to connect the blue--green later tonight.

Any ideas. am I in the right area?
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Old 1st April 2012, 06:30 PM   #2
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connecting the blue and green wires caused it to not turn on at all.... still stuck at the 5 lamp strike failures error.
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Old 1st April 2012, 07:14 PM   #3
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tried connecting the green--red--black and the blue--white. no change... now trying green--black and red--blue--white connections.. im kinda just trying whatever at his point..
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Old 1st April 2012, 07:20 PM   #4
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no difference.... ima keep trying help would be awsome!
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Old 1st April 2012, 08:20 PM   #5
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so i treid putting the Ballast back in connected all the wires back and then grounded the signal back to the MB to a ground on the main PSU... still no luck.
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Old 2nd April 2012, 09:15 PM   #6
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been measuring the lines on the 18 pin main cable to the motherboard and found that pins 12 and 13 are 3.3v when trying to start the bulb and drop to 3.25v when resting in between trying. a try for me is when the color wheel starts spinning again, does it 5 times before giving "lamp strike 5 times failure" error.
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Old 2nd April 2012, 09:50 PM   #7
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Grounded both 12 and 13 separately with no luck. the projector wouldnt even turn on making a quiet clicking sound ive heard before when grounding certain ones of the colored wires from above. I think this thread should be renamed "What NOT To Do When Bypassing A Proxima 6500x (Infocus LP650) Ballast". lol.
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Old 2nd April 2012, 10:30 PM   #8
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i tired connecting the green and blue to the 5v for the ballast control, nothing, wouldnt start same quiet clicking noise. i tried the green to the white and blue to GND. Nothing, but it starts and gives me the lamp failure error again. maybe i need a resistor...
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Old 2nd April 2012, 10:59 PM   #9
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found a 10ohm resistor sitting around tried placing it between the 5v(red) and Green wires. no change.
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Old 2nd April 2012, 11:05 PM   #10
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no luck with the resistor between the blue and green wires either.
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