Help, Help, Help! Mitsubishi 73" red convergence fiasco
I have an older (?) Mitsubishi WS-73907 series and cannot correct its red convergence. I have located the manual convergence feature in the menus, and can alter blue convergence fully, and can alter red convergence in the up/down direction, but NOT in the left/right direction. Every so often, for a very short period of time, the convergence will "magically" be correct, but then quickly goes back to out of whack in a complicated sinusoidal (?) pattern, with the error being zero in one location (right of center) and then progressively worse toward the sides and corners.
How can I fix this? I've been watching this giant doorstop out of focus for many weeks now, but can't stand it any more!
Double images and colors are blurry and fuzzy images .Blue,red and yellow wave coming up from the bottom of the screen on the lower left and cannot be adjusted this is the symptom for busted convergence IC,you must replaced this IC in order that will works better again.STK 392-xxx ICs and it's associated resistor,this resistor automatically change value,can caused truoble even though you change the ICs.If you bring this to a service center they cost you $600 to $700,but if you buy the repair kit you can save more,don't wory it is very easy because there is intallation guide including in the repair kit. Feel free to ask whatever the result... click the link for sample picture guide step by step installation;
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If it goes out after a few minutes, it could be bad solder connections on the convergence IC's or elsewhere. If it shuts down right away, it could be a short in one of the picture tubes which would not be worth replacing. It could also be a shorted high voltage transformer which would also make it beyond economical repair. Unless the set had an exceptionally good picture, I would be inclined to replace it. If you have noticed any color "smearing" across parts of the picture -- trash it.
projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.
Common Problem #1) Convergence has gone out
Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.
This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.
Common Symptoms include....
Screen looks 3D
Colors don't line up
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed or warped.
TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.
Common 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.
You have bad grounds on the convergence ICs. Smacking your TV with a shoe will only work so long. You will definitely need to resolder the signal board convergence IC pins, and save your shoe for other important things. You will need help with this, as this TV is too complicated to repair for the novice. Thanks for asking and show a few hands of support.
Convergence IC's inside of your TV have to be replaced. Also some low value resistors around IC's could be burned as well. Then convergence have to be realigned. This job require above-average soldering skills and cost around $300 if you hire TV repairman to do that. Regards. Russ.
You have a convergence problem,all this sets show this problem sooner or later,you have 2 or 3 amps for the red,green blue colors and this amps go bad and need to be replaced then you have to do a convergence aligment from the service mode and not form the customer controls,a qualified tech should be able to correct the problem since is a common one.
I suspect you may have a short in the horizontal deflection circuits or High Voltage transformer. If the set had a "great" picture, it may be worth fixing providing you aren't planning to upgrade to a HDTV anytime soon, otherwise I would use this excuse to start looking for a new set. Worst case I can envision with this set would be one of the picture tubes having a Short, keeping the set from turning on. That would make it unreparable.
It s a Power supply problem.If you are not familiar with electronic repairs take it to an authorized repair shop.
To get a service manual see link
Download Mitsubishi WS-55807, WS-65807, WT-46807, WS-55857, WS-65857, WS-55907, WS-65907, WS-73907 Service Manual Login or Register to get access all drivers database. Please be sure to enable cookies.