I have a 4 1/2 yr old rear proj. TV that suddenly developed a "bowing" effect in the middle of the screen from both sides. It resembles a "bell curve" and doubles the text and images present. Unable to find any info on the web but suspect it's a board or circut gone bad. I hesistate to spend the $$$ on repairs but will if not too expensive. Amy assistance/advice is really appreciated.
On my panasonic projection, the picture seems like it zooms in closer and zooms back out. It does it pretty often. A "bowing" effect maybe? I dont know where to start looking to fix the problem. Please help.On my panasonic projection, the picture seems like it zooms in closer and zooms back out. It does it pretty often. A "bowing" effect maybe? I dont know where to start looking to fix the problem. Please help.
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You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together convergence repair kits for most models.
The kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, etc. Everything you will need to do the repair yourself.
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3,130 Answers
Re:
This bowing you say happens in the middle of the screen??? on the sides of the set are the lines all white on the test pattern or differant colors. If all differant colors then you have a convergence problem and unless your good with a scope it would be best to leave to a pro. Now you could simply replace the convergence Board but then you will have to adjust all the controls in the set. Now if they just separate a little and still white at the edges its a pincussion problem. good luck Dont forget to write back if you need more assistance or you get it fixed
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Hi, thank you for visit fix ya.
Resolder all connections around fly back ( check for open pico fuse).
if still problem, replace convergence board.
Thank you
Your Projo is a complicated piece of equipment, involving 3 picture tubes (like 3 tv's), convergence failures are extremely common, I dont think $550 is totally unreasonable, but I dont think it is a power supply issue if it is just effecting 1 color, usually it would cost around $100 parts $300 labor to repair, might be a little high, I suppose they are also charging you for pickup and delivery, I hate taking sets into office as that sometimes jars stuff loose or cracks boards.
If you have an ESR meter check C509 on the D board or simply unsolder it and replace it - remember it is polorized so make sure you put the new one in the same direction that the old one comes out.. Then let me know...
If you're not comfortable with that, this is a common problem that causes dark screen and you can probably have a tech come to the home with his trusty ESR meter and check a few caps in that circuit..
Bill
you have bad convergence IC's and possable 1 bad resistor
let me know and i will help you find them in the set if your are a good solderer - or call a tech
thanks
scott
Solution #1
On my panasonic projection, the picture seems like it zooms in closer and zooms back out. It does it pretty often. A "bowing" effect maybe? I dont know where to start looking to fix the problem. Please help.
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