Originally Posted by Jeepinmaxx
He let me know that since I've previously had the DMD board replaced and now the capacitor fix - my set should be around for a while...
That is good news!
There are some things that you can do to avoid the most common future problems which are heat related.
1) Improve the cooling of DLP chip and LED radiators will definitely avoid Red LED failure and may prevent the white/black dot problem. When I opened my set to replace the DLP chip I found the blades on both the DLP and LED radiator fans had a heavy layer of dust. Cleaning both these fans improved airflow.
2) The three LEDs in the set run hot and each has a radiator for cooling. The Red LED radiator receives air that has passed over the first two radiators and because of this the Red LED is the first to fail. Removing the accumulated dust from the LED radiators will extend LED life.
3) From an earlier post of mine:
Some owners have added an exhaust fan over the Sub Power Board access panel that greatly improves air flow thru the set. I followed their example and used a Thermaltake Mobile Fan 12 External USB Cooling Fan 120mm AF0007 from Amazon. It got its power from a USB plug that I inserted into the USB port of my 5689s. When operating the fan was quiet and you could feel the warm air that it pulled from the set. The picture shows the fan mounted with screws http://www.avsforum.com/t/827799/lightbox/post/22167617/id/35113
. I mounted mine a little higher and was able to use three twist ties thru the fan screw holes and adjacent aligned vent holes in the access panel.
1) Leaving off the access panel is not a safe alternative to adding an exhaust fan. Also, that would not increase the air flow as much as the exhaust fan.
2) If you have small fingers in your home, replace the fan grill with a fan mesh.
There is a YouTube video that shows steps in replacing the DLP chip. A companion YouTube video shows cleaning the LED radiators.
I have two problems with these videos:
1) Generally, children should not be around while these procedures are done. The boy in the video seems mature and is well supervised.
2) The amount of silver paste used is way beyond manufacturer’s recommendation. Follow application rules from the manufacturer.
See my post here for more info http://www.avsforum.com/t/827799/2007-samsung-led-owners-thread-hlt-xx87-89s/14300_100#post_23217093
An additional benefit of cleaning the LED Radiators is that you can at the same time clean the large lens which will improve picture quality. There is an angled mirror that can also be cleaned while the DLP chip is removed. But, the chip should not be removed just to clean the mirror.
While the back is removed, you can also check the tops of all capacitors on the Power and Sub-Power board. If not flat then they should be replaced.Be careful removing the back panel and handling the optics in the TV. There is a potential shock hazard even from an unplugged set that has has been unplugged for a while.
On the right back side of the TV there is an access panel held on by a single screw. Do not reach into or insert metal objects into the access with the set plugged in and there is a potential shock hazard even from an unplugged set that has has been unplugged for a while.
With the access panel removed you can:
1) Check the Red LED Radiator for dust accumulation. However, you can not see the DLP fan, LED Radiator fan, Green and Blue LED Radiators mentioned above. Cleaning the Red LED Radiator from the access panel is something that I do not recommend, though others may.
2) Check the tops of the capacitors on the Sub-Panel board. If the top of a capacitor is not flat then it is failing and should be replaced. Capacitors with flat tops can still be failing but showing no physical or TV symptoms. If your TV model is covered by the Samsung Capacitor Settlement Agreement then it was built with bad capacitors. See image below. If your TV is in the US then you should file a claim under the Agreement before the claim period expires September 2, 2013. Under the agreement Samsung pays for all parts and labor to replace the capacitors. No TV adjustments are required after the capacitors are replaced. When filing a claim it is best to do it by phone. Write down all the information on the service tag which is on the edge of the TV on the side with the inputs and outputs. They also want when and where purchased.No symptom is required under the terms of the settlement.
A visible bulging cap top seems to be accepted without question while other symptoms may be questioned. Samsung's policy may now be to try replacing the capacitors on the Power and Sub-Power boards because no replacement boards are and never will be available. It is unclear if TVs with severe power on problems (see previous posts for details) are recognized as not be helped by capacitor replacement and if $300 offer under settlement terms is rejected as not sufficient, still referred to another department which offers out of warranty exchange with fee.
What happens after you file a claim has changed over the last few months. Check previous and newer posts for what you can expect. And of course, post your own experience. You won't miss anything if you start reading this thread at my post http://www.avsforum.com/t/827799/2007-samsung-led-owners-thread-hlt-xx87-89s/14300_100#post_23159257
Separation of the back cover and the chassis:
DLP fan (above left red circle) and covered LED radiators (above right red circle):
LED radiators and fan with cover removed:
Sub-Power Board and Red LED Radiator which can be checked from back right side access panel without removing back of TV:
Samsung Capacitor Settlement notice:Edited by JRWalker - 6/24/13 at 4:04am