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Topic: UHE (E-TORL) bare bulb polarity?
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Joined: Jul 12, 2011
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Epson PowerLite Home Cinema 1080 UB
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Do these bulbs have a polarity? Or, does it matter which lead goes to which post on the connector?

I recently purchased some bare bulb replacements for my Epson HomeCinema 1080UB, which takes the ELPLP39 lamp. I had a previous cartridge with a blown bulb in it, so I got a set of 3 of these bare bulbs to rotate through the two cartridges I have.

Upon closer inspection of the bulbs, I see that the 2 leads coming from the front center of the lamp (where the thin glass bulb is located) and the rear center of the lamp (where the ceramic is located) are not always wired to the same post on the connector. The connector will only fit into the cartridge/housing in one orientation, having the "larger tab" facing outward (toward screen, or "front"). One bulb may have this "large tab" post wired to the front of the bulb, while another bulb will have this post wired to the back of the bulb. So my question remains...

Do these have a polarity? Does it matter if the front or the back of the bulb is wired to the "large tab" post, or vice-versa? Or are these bulbs strictly AC, in which case it shouldn't matter?

I realize that the connector must be positioned correctly within the cartridge in order to be inserted into both the cartridge and the projector itself, but if the leads are reversed on the connector-to-bulb front/back wiring, do I risk damage?

Thanks,
Akro
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Joined: Jan 8, 2021
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Hello everyone,

I know, this question was posted NINE years ago.

But I have the exact same problem.

I wonder if Akro found out if it's okay to reverse polarity on these bulbs?

I'm handy enough to cut, reverse and splice the cables if necessary but I don't want to bust the new bulb either.

Thanks for reading and possibly helping...

Dan.
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Quote (Bluesky99 on Jan 8, 2021 5:37 AM):
Hello everyone,

I know, this question was posted NINE years ago.

But I have the exact same problem.

I wonder if Akro found out if it's okay to reverse polarity on these bulbs?

I'm handy enough to cut, reverse and splice the cables if necessary but I don't want to bust the new bulb either.

Thanks for reading and possibly helping...

Dan.

Dan - Please hit up FixItFrank on YouTube with that question. He actually repairs projectors and makes videos of it. He's VERY DEEP into the real knowledge of how these things work. Include your make/model and any other useful information for him.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
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Thanks AV_integrated,

I'm coming back just to mention I plugged the bulb with the polarity reversed. Tt's been working fine for weeks now.