Just witnessed what I've read here... my L75-A91 startup screen started out bright then dulled, all inputs are now also dull and have a color shift every 10-20 seconds, random power downs without any messages.
I have no diagnostic codes, other than the "12" which is from when I have unplugged it and have moved it around.
Tried all the reset options... a/v resets, initialize reset, hard reset (8sec power button hold down, which oddly allows the laservue startup screen to remain bright but then dull when any input content is loaded)
My service menu now also has a red hue to everything.
I have 2520 hours on the set, though the most time on any laser was red at 67,686 minutes, which is just south of 1,133 hours.
I've read that people here and elsewhere blame the red laser as the problem associated with this issue, but I guess I don't see how that is possible, the startup screen starts out bright then dulls, if the laser was worn out it would always lack the ability to produce a bright picture.... a laser is supposed to be "solid state" not "jelly"
The only thing I noticed that I hadn't before is that my temps always report 00.00 degrees C in the status menu and Peltier DAC % at 100.00... I bought a service manual PDF download and found where the TEMP1 board is located but since the manual doesn't have any operating readings that should be between pins, nor the replacement p/n for the board it's more of a dead end. The only thing I see is bad soldering on the connector on the HDMI board that the temp1 board leads go to.
If someone has a working laservue and would post what their readings are for temp and peltier dac %'s are it would be appreciated (status menu: menu+2+4+7+0)
Is it possible the light engines have a "limp mode" if the temp board has an open, or no reading period, in order to keep the engine from overheating? Because it's obvious that it's capable of brightness, something is limiting the output from the light engine.
My fans still function and the heatsink fins are clean...
Mitsubishi should feed us a engineer to help us create a flowchart on diagnosis and repair of these sets, and they should also open up their suppliers to us so we can create some DIY fixes for the light engine. The DLP chip replacement is easy, the lense cleaning is easy. Soldering a new laser diode would also be easy...
I have a 82" dlp, and two 4k screens in house, but the laservue was the "go-to" panel for blu-rays.
I don't want to give it up, I want it fixed.
My WD-82738 of the same year (2010) has over 20k hours on it in my living room and other than a slight whine when it starts up (possibly the fan, most likely the color wheel) functions fine.
If they're done with the laservue line, they might as well give us component level replacement info.
But as I asked earlier, if someone has a working set they can post temp #'s
and if they're daring enough to give me readings off their temp board pins, it would be appreciated.
I worked for a manufacture of MRI PCB/Wiring for almost 10 years, I'm not worried about replacing parts at a component level. If it is the temp sensor board, if they would open up the supplier info, I could get the data sheet on the sensor and find a replaceable part and use some thermal conductive epoxy to reattach to the board...