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you need a new power supply unit these after some time get old and start over heating causing the tv to heat up intermediately if you take it to a repair shop and have that replaced it will be like new again
In the 65" TVS there are 4 or more fans One of these is not functioning Probably the one over the power supply itself This will cause it to heat very quickly and shut down in a matter of about 20 seconds.
only way to find out which fan is not working isw to remove the back.
They had some stupid problems with these sets---If you know how to remove the lamp---it is customer replaceable--take it out and examine it. Shut set off first and wait a few minutes for the lamp fan to turn off. Unplug set and locate and remove lamp. Some of these sets had a lamp (it is in a cartridge like a box) that they covered openings on the housing with a screen like material (like window screen). One side of the lamp has a fairly small narrow strip of this and it blocks up with dust from the fan which is trying to keep it cool---if the screen is blocked up you will see it; Do not touch the face of the lamp when you handle it--if you find yours has a screen like material--clean it off with a brush and put it back--the later replacement version of this lamp has a screen that is coarse and does not block up with dust---on a couple of these I removed the blocked up screen material until I could get the newer lamp so the customer could continue to use it--if cleaning the dirt off works you may have to do it from time to time--depends on environment--the fan tends to pull dust and such out of the air and right into the lamp---
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"air flow blocked" means its getting too hot. or it thinks it is. it is quit common on these set that the thermal sensor has malfunction replaceing this sensor is your solution. since this is service bulliteen item at service centers of mitsubidshi products this may be an item covered under warrenty. so i would first check with you local service shop too see before
most rear projectors will turn themselves off whenever the lamp is dead. what we call protective mode. in this case the yellow light may be for the lamp. otherwise check if all the fan are working properly. But MAKE SURE you let sufficient time for the tv to cool off before unplugging the main.
If you have a WD-52525 Model TV and the the screen displays "air flow problem" change the sensor. There's not a positive way to check device, just replace it, trust me. IF your TV is a different Model MIT'S has a recall on those certain Models. REPLACE.
There is a software patch that increases the cut off temperature you may get this at Loewe Website. Quick fix is reverse one of the fans on the back of the set this gives a through flow of air rather than all fans blowing into the set.
you must have a wd series mitsubishi..the lamp tempurature sensor has a manufacturing problem..mitsubishi has an updated one to take care of the problem..the sensor itself is not bad it is the way the wires are crimped in the plug,,the new one is soldered..the part number is 299P313010A,