Question about Televison & Video
I have a Mitsubishi WD 65638 and just came in and turned it on and the center of the screen is "fuzzy". i notice that on the outsides of the picture its fine. Just the center. Any suggestions on what it can be?
Is the menu coming up the same. as it can tell you a lot if it is not. fuzzy screen in the middle could be the mirror has come away from the back or there is a build up of dust on the projector or projector light. it could also be one of the camber mirrors in side the projector has come loose or discolored. if the menu comes up ok then it is the avi board control chip as the projector is separated from the other boards and it gets its signal from this.
Posted on Oct 22, 2013
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Posted on Jan 02, 2017
A WD62827 is a V30+ chassis and is a DLP format projection screen Tv, not a flat screen, am I missing something?? For the symptoms you're describing with a WD62827 remove and reseat the DVI cable between the chassis and optical engine. If removing and reseating the DVI cable does not resolve the issue you may need to replace the Optical Engine part # 938P019020
BTW the current software version for this unit is 7.04.1F if you have anything less you might think about updating the software also..
Hope this helps!
Posted on Nov 29, 2007
Hello stevenkgray and ADIMEN,
I think what has happened is the your TVs are out of focus which could be due to a voltage problem. First I would warn you that this is a problem in the High voltage section of your TV and caution should be taken, in fact I would suggest that if you do not have a background in electronics that you get the TV checked and fix by a qualified TV repair technician. However if you do have a background the next few lines will make sense and you might be able to effect these repairs yourself.
Items needed for troubleshooting:
High Voltage probe (40Kv)
Universal Video Analyzer (UVA)
1) Unplug the TV and take the back off of it
2) connect the UVA to the tuner F connector and setup the UVA to send a test pattern into the TV
3) Power the TV back up and turn to the channel set on the UVA
4) check the anode voltage on the CRT with the HV probe (connected to the Multimeter set to volts and grounded) and compare it to the voltage on the schematic.
5) If the voltage is not right adjust the focus and screen controls on the Integrated High Voltage Transformer (IHVT) to obtain the proper voltage.
6) Check the pattern to see if it is still fuzzy.
If the pattern is still fuzzy you may have to inspect/replace the IHVT and or its associative circuitry.
If you suspect that the IHVT is bad you can perform a ring test on the transformer using the UVA. (The instructions on how to do this are on the UVA quick steps pull out. or the instructions can be looked up on the web.
I hope this helps
Posted on Jul 04, 2008
Your TV most likely has one or more possible problems.
Problem #1: Convergence Chip Failure ( common problem )
Here are some of the most common symptoms and example photos of a convergence problem
Here is a quick test....
Using your original remote go-to the tv settings then goto the convergence section.
Try to adjust the red and then the blue convergence.
You should be able to move them up, down, left, and right.
If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.
You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.
Problem #2 CRT Fluid is Cloudy
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
Picture of a set that needs the fluid changed.
TV set after fluid change
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.
Posted on Mar 26, 2009
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