Question about Televison & Video
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Posted on Jan 02, 2017
THE PROBLEM IS A MAIN SIGNAL PCB PART A94-00139A , YOU MIGHT AS WELL BUY A NEW TV, THE TV YOU PURCHASED WAS A CHEAP TV AND THOSE DONT LAST AND PARTS ARE HARD TO FIND
Posted on Nov 14, 2007
Your problem here has to do with the amount of aging that happens to the three colour tubes - red, green and blue.
Blue actually ages slower than red and green. What actually happens is the green tube deteriorates and due to green being the predominant colour for brightness causes the blue tube`s flyback lines to appear - especially when switching between inputs or when the video is blanked.
No replacing the blue tube will not solve your problem as the tube is actually the best one of the three.
As someone mentioned there is a way to adjust this by removing the speaker grill assembly in front of the set. Doing the service mode adjustment with the remote is not the right way to solve the problem - you would be adjusting the colour gain and off-set values and would seriously be compromising the white balance of the set.
On the left hand side behind the speaker cover you will see a black square block with six adjustment points. Look for the one marked SCR BLUE, Switch the set to a unused input so the blue lines become visible. Now adjust the BLUE point counter clockwise until the lines disappear. A small adjustment should do it, Switch back to a picture and make sure the whites are still white.
This should sort your problem. I would however suggest asking a Sony service centre to do this for you. This is a dangerous thing to do as you will be working close to the 35Kv supply the the anodes of the three tubes.
I hope this answers your question.
Posted on Mar 08, 2008
SOURCE: PT5299HD screen
I had the same problem trying to find a new screen. What I did was found a local plastics shop and had a piece of 1/8" plexy glass that has one side anti-glare. It was only $50, and its alot more durable.I had a few problems changing it though. First you have to pull the rear bottom panel lose, then the rear top. Once the screen is exposed (TAKE THIS ADVICE), put a small piece of tape on one of the top corners and mark its position. This has a two part screen and the inner one is a image magnifier and goes only one way. It took me 4 trys to reposition it right for a correct picture. Once you do this carefully unbolt the two side and top screen brackets. Make sure you dont mess with the four centering sensers. Only loosen the screws on the bottom screen bracket. Take the screen out and seperate the two screens by removing the tape around the edges. You will now discover that only the outer antiglare screen is craked. Clean the three inner sides with windex and a paper towel, then use a cotton rag or tee shirt to eliminate any particles left behind. Once you get the screen in place dont over tighten the screws they strip very easy. Since you have the tv apart you should go ahead and blow all the componits off with a keyboard cleaner, and clean the bulbs with a super soft cotton teeshirt with a small spray of the windex on it, dont spray the bulbs directly, and do the same with the mirror. Remeber that all streaks will show up on the image screen. Clean the out side of the screen after you put it back together. Oh yeah, make sure its unpluged first.
Posted on May 24, 2009
SOURCE: television shuts itself off
i had the same problem with my set shutting off and was told it may be the ballast so i changed that but it still would start up and shut down after a few mins, then i was asked if the bulb had been changed and i had not, so i did change the bulb and have not had it shut down yet. :) (so try a new bulb)
Posted on Jul 17, 2009
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