Buzzing/Rattling/Vibrating Speakers on WD-62531 LCD Projection Television

[SurrealMustard]

I recently acquired this well-kept Mitsubishi LCD projection television (one of the only LCD-based rear projectors Mits ever made among all of the DLPs and CRTs) but am not pleased by the sound. I know that TV speakers usually suck and that there's not much that can be expected out of small speakers, but these just seem unseasonably bad. When certain frequencies play, usually voices, (especially President Trump) there is a rattly vibration that is audible. I turned the bass down to the midpoint, which reduced the problem, but didn't eliminate it (and also cost the speakers what little bass that they could produce).

Given how tricky sound can be sometimes, it's hard for me to isolate where the distortion is coming from exactly. It might even be a case of blown speakers. Does anybody have any tips for finding out what is causing the rattling? A visual inspection of the speakers themselves reveals no obvious issues.

[RJARRRPCGP]

Re: Buzzing/Rattling/Vibrating Speakers on WD-62531 LCD Projection Television

I recently acquired this well-kept Mitsubishi LCD projection television (one of the only LCD-based rear projectors Mits ever made among all of the DLPs and CRTs) but am not pleased by the sound. I know that TV speakers usually suck and that there's not much that can be expected out of small speakers, but these just seem unseasonably bad. When certain frequencies play, usually voices, (especially President Trump) there is a rattly vibration that is audible. I turned the bass down to the midpoint, which reduced the problem, but didn't eliminate it (and also cost the speakers what little bass that they could produce).

Given how tricky sound can be sometimes, it's hard for me to isolate where the distortion is coming from exactly. It might even be a case of blown speakers. Does anybody have any tips for finding out what is causing the rattling? A visual inspection of the speakers themselves reveals no obvious issues.

I would look for loose things around the speakers. The speakers are visually OK... If they're actually blown, then they wouldn't work.

[R_J]

Re: Buzzing/Rattling/Vibrating Speakers on WD-62531 LCD Projection Television

I would use my audio generator to find the frequency that causes the problem, then try to isolate it, it could be part of the cabinet vibrating at a certain frequency. there are programs you can run on a computer that will output varying frequencies that might make finding the problem easier. That "rattly vibration " from Trump's voice might be normal

[Andrew F. Ali]

Re: Buzzing/Rattling/Vibrating Speakers on WD-62531 LCD Projection Television

If you have a pair of spare speakers, disconnect the original speakers and connect the 'test' speakers and try-it. If the rattle persists then you have a Audio amp issue. If it stops get new speakers

[SurrealMustard]

frequency test results

I would use my audio generator to find the frequency that causes the problem, then try to isolate it, it could be part of the cabinet vibrating at a certain frequency. there are programs you can run on a computer that will output varying frequencies that might make finding the problem easier.

Using the szynalski tone generator website, it would appear as though the problem kicks in abruptly at around 190Hz and stops equally abruptly at around 259Hz. That's with the equalizer set with the bass on full.

There's also a slight buzz at between 193 & 205Hz, 333Hz & 341Hz and 360Hz & 380Hz no matter what. With the neutral setting, the higher-frequency buzzes remain, but the annoying distortion seems to go away. With the bass set lower, the issue that remains seems to be some kind of rattling inside of the casing based on the fact that I can feel and manipulate it by pressing on the little round access panels on the sides of the television (especially the right-most one). Hopefully the alternative speaker test will help shed some light on the nature of these issues.

If you have a pair of spare speakers, disconnect the original speakers and connect the 'test' speakers and try-it. If the rattle persists then you have a Audio amp issue. If it stops get new speakers

Can I safely use 8Ohm speakers in place of the 4Ohm speakers in order to test adequately?

[R_J]

Re: Buzzing/Rattling/Vibrating Speakers on WD-62531 LCD Projection Television

Yes you can use 8 ohm to test, take the access panels of and see if that cures it, the way these things are built the plastic can vibrate, a lot of them place a fabric tape between the back cover and the cabinet to stop this but it could be vibrating somewhere else
It looks like it has audio out jacks so you could use them to connect to an external amp

[SurrealMustard]

As suspected...

Interesting. The problem persists with alternative speakers installed, so there are indeed issues with both rattling inside of the casing and an irritatingly-broken equalizer/amplifier hardware/software. Between that, the misconvergence of the green panel, and the fact that the dynamic contrast iris cannot be disabled on this model, I think I'm just going to sell it as-is after installing a proper name-brand lamp. It's still good to have some closure, and the machine will at least be functioning as well as it possibly can for its next owner.

As always, thanks for the tips!