The Mitsu 57-732 strikes again....

[yettitheman]

After the bulb change on the Mitsubishi WD 57-732 a little while back... me and my Dad have been noticing "bloom" around brightly lit segments against black or very dark backgrounds (bleeding light).

I was thinking that it could just need calibrating.... but that's more of the old CRT projection TV days. A bit of reading points to... Light Engine!

Wasn't quite expecting that at all.... (sarcastically says: "Well, every time the bulb goes bad, just replace the back of the entire ****ing TV, that way we wont have ANY more problems )

However, me being a pyrotechnic and having an assimilated fascination with a Phillips screwdriver will lead me down a road called "$2000 DLP TV TEARDOWN: Will I win? OR TV DIE????"

Stay tuned... you may soon see the back of a TV completely torn apart.

 

[KASR]

Oh my! Best of luck - bummer to hear that the Mits is giving ya fits.

 

[allargon]

After the bulb change on the Mitsubishi WD 57-732 a little while back... me and my Dad have been noticing "bloom" around brightly lit segments against black or very dark backgrounds (bleeding light).

I was thinking that it could just need calibrating.... but that's more of the old CRT projection TV days. A bit of reading points to... Light Engine!

Wasn't quite expecting that at all.... (sarcastically says: "Well, every time the bulb goes bad, just replace the back of the entire ****ing TV, that way we wont have ANY more problems )

However, me being a pyrotechnic and having an assimilated fascination with a Phillips screwdriver will lead me down a road called "$2000 DLP TV TEARDOWN: Will I win? OR TV DIE????"

Stay tuned... you may soon see the back of a TV completely torn apart.

Yawn... I have the same TV. You don't have to replace the light engine. You just need to clean the lense inside the light engine.

http://www.avsforum.com/avs-vb/showthread.php?t=688802&page=301

Look in that thread for a PDF that also contains step by step instructions. Either use a video camera or take a lot of pictures, so you don't forget which lead goes where. It's not that hard though. It takes about one and a half hours from start to finish. The TV will look better than new when done. Oh--wear gloves and keep about four or so sandwich sized plastic bags to store the various fasteners by groups.

 

[Hi Ho]

I hope you get it working because that is not a cheap repair. I personally cannot recommend rear projection sets at all due to the amazingly high failure rate I have experienced. Downstairs at work today I counted eight Mits DLPs in for service, several are repeat offenders. There are also five Sony SXRD sets. Rear projection sets are by far the most repair prone type of TV.

 

[yettitheman]

Yawn... I have the same TV. You don't have to replace the light engine. You just need to clean the lense inside the light engine.

http://www.avsforum.com/avs-vb/showthread.php?t=688802&page=301

Look in that thread for a PDF that also contains step by step instructions. Either use a video camera or take a lot of pictures, so you don't forget which lead goes where. It's not that hard though. It takes about one and a half hours from start to finish. The TV will look better than new when done. Oh--wear gloves and keep about four or so sandwich sized plastic bags to store the various fasteners by groups.

Bringing this back from the dead!

I actually looked a bit deeper in that thread, as now I have some time to do a more thorough investigation. You are correct though on theory; the path of which my light source got blurry was the lens assy. However, fearing many many small parts (see: Trying to fix a Pentax K1000 = me crying), decided to just leave the set in still working condition.

However, with threats of it being burned, I'm going to try this out. Hopefully the Zeiss crap I have on hand will work good enough, as I ran out of the good stuff (Formula MC-1).

 

[jostenmeat]

However, with threats of it being burned, I'm going to try this out. Hopefully the Zeiss crap I have on hand will work good enough, as I ran out of the good stuff (Formula MC-1).

You obviously have experience with this stuff, and have already formed opinions, but it seems to me the Zeiss stuff is crap. I tried it, off of Amazon, for my PJ, after lsiberian gave it the ok, but meh. I'd wait to get some "good stuff" as you call it. I remember this recent thread about cleaning the PJ model I have, in case anything might interest you. YMMV.

 

[allargon]

Bringing this back from the dead!

I actually looked a bit deeper in that thread, as now I have some time to do a more thorough investigation. You are correct though on theory; the path of which my light source got blurry was the lens assy. However, fearing many many small parts (see: Trying to fix a Pentax K1000 = me crying), decided to just leave the set in still working condition.

However, with threats of it being burned, I'm going to try this out. Hopefully the Zeiss crap I have on hand will work good enough, as I ran out of the good stuff (Formula MC-1).

It's not many small parts just a few screws. For the record, someone was nice enough to make a dedicated thread for the procedure.

http://www.avsforum.com/avs-vb/showthread.php?t=1148792

I'm going to clean mine again in the near future, once I'm done with wedding stuff.

 

[yettitheman]

It's been a few days since I've done the procedure.

Yes. The Zeiss stuff.... not so well for cleaning what appeared to be the start of fungi or some colony. The crap on the lens reminded me of contaminated broth culture starting to take shape, yuck.

The whole thing from start to finish took me 45 minutes. About 5-10 were trying to find a screwdriver and a box of Q-tips. Since the Zeiss wasn't going well, I fell back on old methods of cleaning camera and projection CRT lenses.

Turns out, it did well. However, initial firing left me with a bit of streaking and haze. Left it alone for a few days, and it cleared up.

It's back to (near) brand new condition. In it's state, it's very very usable. I have a feeling though, that I will have to do this procedure again. But, now, at least I know.

Now to get the annoying TV guide to quit popping up every time it fires up.

 

[yettitheman]

Two weeks later, knock on wood.

Now I need to look for a power conditioner so I can get rid of flickering brightness that the power company so graciously provides me (I really need a oscilloscope).