2008 Samsung HL61A750 LED DLP owners thread and FAQ - Page 505

Originally Posted by KewlK 


Sure, this is one of the better prices I can find on them:

http://www.shopjimmy.com/samsung-mit...7-dlp-chip.htm


-Do not touch- the clear window while handling.

Originally Posted by Elrowyn 

I had the same problem, dimming line down the left side. I didn't notice it until after the power came back on after 2 days from that bad storm. Luckily I also have a warranty on it so I'm gonna call tomorrow. On a side note, is there a local "for sale" forum here? If I get this fixed I might want to upgrade to a mitsu 83.

Originally Posted by Elrowyn 

Yeah I know, if it IS the led light engine then it might fall under "bulbs" and they generally try to exclude those. I have mine through geek squad and it was a 4 year so it's still good til next summer. The tech on the phone said if it was the light source the picture would appear yellow or purple because only one color would be out. Makes sense and he seemed to know what he was talking about, but that doesn't mean he is correct either. Anyway they are sending someone out tommorow.

Originally Posted by Elrowyn 

I had the same problem, dimming line down the left side. I didn't notice it until after the power came back on after 2 days from that bad storm. Luckily I also have a warranty on it so I'm gonna call tomorrow. On a side note, is there a local "for sale" forum here? If I get this fixed I might want to upgrade to a mitsu 83.

Originally Posted by HD_Sports_Fan 

This appears to be the light tunnel shadow problem. It is exactly how mine looked when it happened to me. Good news is it's not hard or expensive to fix yourself. Just follow the instructions in this thread.

Originally Posted by Augerhandle 

Is this similar to your problem?: http://www.avsforum.com/t/758625/shadow-on-left-of-samsung-dlp-screen/2580#post_21830966

Originally Posted by aaronwt 

That would only put you around 6570 hours after 3 years at 6 hours a day. Nowhere near the 60K hours.

Originally Posted by Elrowyn 

wow, guess 60k is quite a long time, lol. Still curious about the degradation. Will it be a sudden loss or a gradual dimming of the picture? Really curious about this.

Originally Posted by mingus 

Which post was the vacuum thing?


Mine still works well, was thinking about one of these fans for cooling:

http://www.amazon.com/gp/product/B002OJN250/



Only USB I see says Wiselink, use this? The one pic posted looks like the fan was on the opposite side from the USB port?

Originally Posted by Low Tech 

...PS, before I get Mits fan boyz after me for saying Sammys and Mits use the same technology... Terminology has been raped by commercialism, by stretching the limits of standards. There is no way a real laser would be used in a RPTV. The weakest true laser is far too bright than what our LEDs are capable of. Along with that, the cost of having 3 lasers would make the Mits DLP a bit steep that what it was originally sold for.

Originally Posted by cyberized 

Have had my HL 61A750 for years now and it has been trouble free............BUT.............has given me my 1st "heads up!" because last night while starting to watch the news, I lost both audio and video, I have DirecTV so I tried other channels

---

ALL blank. I tried the DTV Receiver self check and that was not it..........so I had ability to use Menu/Program Schedule etc. on the DTV Receiver but still NO audio or video signal. I started tracing my HDMI connections from DTV Receiver to myy Pioneer A/V Receiver etc...............I have been using one of those 3D Adapters in the mix in order to get 3D fm DTV - so the HDMI Cable from DTV Receiver 1st goes to it and then from there to the A/V Receiver. I figured that must be my "weak link"......
I also have a HTPC conncted up in the Entertainment equipement which I hadn't turned on in ages.......BUT.........figured if I turned it on then I could test to see IF my HDTV was incapable of displaying audio and video now..........GLAD I was able to do that, because I found that the TV did still display audio and video. I went to bed figuring that due to the above experiences that this AM I would just disconnect the special 3D adapter and take it out of the equation and go direct with the HDMI cable fm SAT Receiver to A/V Receiver and thus do w/o 3D [have not been watching 3D anyway].
BUT.....this AM I 1st turned on my SAT/A/V Receiver, and HDTV normally and WALA it was all working as NORMAL?????
Just guessing here - but could that possibly mean that a Power Supply unit w/in the 61A750 is dieing and that I can probably look forward to after it being on a certain amount of time I will probably lose audio and video again and again until finally the PS will die totally and then of course NO a/v at all???
PLEASE advise...................I have NO Insurance on my HDTV...........THANKS, michael

Originally Posted by cyberized 

Have had my HL 61A750 for years now and it has been trouble free............BUT.............has given me my 1st "heads up!" because last night while starting to watch the news, I lost both audio and video, I have DirecTV so I tried other channels

---

ALL blank. I tried the DTV Receiver self check and that was not it..........so I had ability to use Menu/Program Schedule etc. on the DTV Receiver but still NO audio or video signal. I started tracing my HDMI connections from DTV Receiver to myy Pioneer A/V Receiver etc...............I have been using one of those 3D Adapters in the mix in order to get 3D fm DTV - so the HDMI Cable from DTV Receiver 1st goes to it and then from there to the A/V Receiver. I figured that must be my "weak link"......
I also have a HTPC conncted up in the Entertainment equipement which I hadn't turned on in ages.......BUT.........figured if I turned it on then I could test to see IF my HDTV was incapable of displaying audio and video now..........GLAD I was able to do that, because I found that the TV did still display audio and video. I went to bed figuring that due to the above experiences that this AM I would just disconnect the special 3D adapter and take it out of the equation and go direct with the HDMI cable fm SAT Receiver to A/V Receiver and thus do w/o 3D [have not been watching 3D anyway].
BUT.....this AM I 1st turned on my SAT/A/V Receiver, and HDTV normally and WALA it was all working as NORMAL?????
Just guessing here - but could that possibly mean that a Power Supply unit w/in the 61A750 is dieing and that I can probably look forward to after it being on a certain amount of time I will probably lose audio and video again and again until finally the PS will die totally and then of course NO a/v at all???
PLEASE advise...................I have NO Insurance on my HDTV...........THANKS, michael

Originally Posted by Low Tech 

snip...
PS, before I get Mits fan boyz after me for saying Sammys and Mits use the same technology... Terminology has been raped by commercialism, by stretching the limits of standards. There is no way a real laser would be used in a RPTV. The weakest true laser is far too bright than what our LEDs are capable of.
snip...

Originally Posted by cosmicvoid 

Solid state lasers are available from a few milliwatts up to dozens or hundreds of watts. The ones at the low end of the power scale are certainly less bright than the LEDs in the Samsung sets. I think you don't know of what you speak.

Originally Posted by Low Tech 

My statement was in general about mits tvs having lasers, just because the warning label states class 4 laser. Class 4 laser warning is a statement in general terms. Caution should be taken as there is a highly focused intense beam...

Since you took the clip from another reply, the whole judgement is out of context. I do not take warning labels as a technical data sheet. Again the word Laser is a general term in commercial electronics.

Modified LED technology used as has been used in laser tech since the late 70's. The first commercial laser diode was in Video Disc technology.

Laser LED is basically a generalist term, the true technology behind the device is not given, unless you have the data sheet. Engineers will be more specific about details, since no engineer has come forward as of yet, I will stand by my generalist term (Laser LED or Laser Diode) for just about any commercial laser in electronics devices.

As for real laser vs laser like properties, Laser has become a general term now these days. Anything is considered laser as long as the focal point allows maximum intensity within a small focused area.

Killing ants with a magnifying glass is a basic laser.

I generally give information, and it seems one can take my information and twist to there needs. Because of my generalist views, I do not care what people think of me. The internet is huge, if they want to know more they can find it them selves.

Originally Posted by Augerhandle 


LASER = Light Amplification by the Stimulation and Emission of Radiation. It is a coherent beam of limited wavelength. A sunbeam through a magnifying glass can by no means be considered a laser, nor can any device which does not lase.

Class 4 laser is not a general statement! It is a government required safety classification applying only to laser devices. http://www.fda.gov/Radiation-EmittingProducts/RadiationEmittingProductsandProcedures/HomeBusinessandEntertainment/LaserProductsandInstruments/default.htm
There are 4 classes of laser, with 4 being the highest and most dangerous rating. The low power lasers cosmicvoid referred to are Class 1 lasers. The lasers in Mitsubishi's LaserVue TV are Class 4 lasers enclosed in a protective housing. The complete assembly is rated Class 1 because of the housing.

Originally Posted by Low Tech 


Laser is a broad technology. You are making it so narrow that it seems your knowledge is mostly quotes from your sources.

IIRC LED devices are not required to have any standards as with Laser Diodes.

You should look up Laser diodes, they are hi-intensity LED devices with integral lens structure to produce a focused beam. Made exclusively for Laser applications.

Now with specialized uses becoming more prevalent, specialized Laser Diodes are too costly or mainstream commercial devices when LED technology has downsized considerably to the point of allowing the manufacturer to design around the focusing of the beam to be part of the complete device, not the diode its self.

This also cuts costs since, manufactures do not need to comply with manufacturing rules and mandates for Laser devices in order to market to the US and foreign countries. Thus no warning label required.

None the less, any technology that can focus light down to a narrow beam is considered a laser. Just Hi-intensity LED by its self cannot be classified as a laser. The this is because the light is not narrowly focused into a beam by its design. Though the Laser Diode and LED have the same light capabilities, in fact they are the same device, just no focal lens on the LED. LED devices are very directional on there own, about 60 degrees of radiant light.

My generalist approach with sunlight is valid, though one lens is not going to be the best implementation.

By using a UV pass filter (only UV light can be transmitted), and lenses, you can make a fairly powerful UV laser from the sun. As goes with IR pass filter, or using the narrowest wavelength (visible light) with UV and IR blocking filters.

From what you have been stating all along the way, shows you have a very narrow understanding even when you show us how broad your information really is.

Yes you can argue all you want that Samsungs doesn't have Mits' 3 Lasers, but none the less the light from the LED devices are focused beams from the light engine which is doing the function of a single laser. While the light being produced at the pannel being no different than your Mits lasers. By doing so, it is more cost effective, along with not requiring a warning label.

Originally Posted by Augerhandle 

Coherent light is not the same as focused light. While LEDs can be focused, they do not emit coherent light, nor does the sun. Only lasers emit coherent light. I'm really sorry that you don't understand the difference, but I am satisfied that most everyone else does. Have a nice day.

Originally Posted by Low Tech 


Really??? LED devices have been producing coherent light commercially since the 70's. IR remotes for example. 900nm is a very narrow wave length compared to visible light. As of recent, LED tech has been producing very narrow wave length visible light spectrum without filtering.

...Again lasers is a broad technology, and you should understand a narrowly focused beam is the basics of a laser, whether it is emitted by charged gas or through solid state devices. The type of light does not mean it is a laser.

Your class 4 warning label is only needed if the component to the device is not safe when operating disassembled. LED components that are not manufactured as laser diodes, are safe to operate disassembled... So no warning label is needed even though the light intensity is the same or even higher than a similar laser component.

Like I said before the Mits lasers are just laser diodes, which are a LED device that have a focusing lens built in.

Originally Posted by Low Tech 

...There is no way a real laser would be used in a RPTV...

http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/leds.html

http://en.wikipedia.org/wiki/Solar-pumped_laser...

the LED structure is placed in a tiny reflective cup so that the light from the active layer will be reflected toward the desired exit direction.

Laser action (with the resultant monochromatic and coherent light output) can be achieved in a p-n junction formed by two doped gallium arsenide layers. The two ends of the structure need to be optically flat and parallel with one end mirrored and one partially reflective. The length of the junction must be precisely related to the wavelength of the light to be emitted. The junction is forward biased and the recombination process produces light as in the LED (incoherent). [The difference being that] Above a certain current threshold the photons moving parallel to the junction can stimulate emission and initiate laser action.

A laser diode is a laser whose active medium is a semiconductor similar to that found in a light-emitting diode.

Spontaneous emission gives the laser diode below lasing threshold similar properties to an LED. Spontaneous emission is necessary to initiate laser oscillation

While a laser diode is a true laser and not just a glorified (and expensive) LED, there are major difference compared to a gas or solid state laser...

...Yes indeed, a diode laser is a true laser.