BIG YELLOW CIRCLE WITH A BLUE OUTER CIRLCLE HOW TO SOLVE THIS IN MY HITACHI ULTRAVISION MODEL 50VS69A

SOURCE: problem in Hitachi 53UWX10BA

The convergence ic's, and related components that could'be affected need to be replaced cost to repair 250.00 2hrs job max with alignment this depending on the tech. If you need more help let me know

SOURCE: hitachi ultravision LCD

I recently had the same problem. You need to contact Hitachi (1-800-448-2244) and advise them of the issue. Hitachi will give you a local service contact who will look at your TV and advise you that the light engine needs replacement. Afterwards, you need to call Hitachi back and speak with a customer service Rep. They replaced the part (I was quoted $530) but I had to pay labor and service (($370). If your TV is 12-18 months you should be able to get them to cover both. Based on the service rep that fixed mine, he indicated he has replaced about 40 of these since late 2007. Mine was replaced last week and now I have a different issue, a bright blue pixel light. Now it's round 2 with the service department. I have not been impressed with Hitachi's customer service considering I spent $3200 on this TV 3 years ago. Hope this helps. Good Luck!

SOURCE: PROJECTION TV HITACHI ULTRAVISION COLOR CONVERGENCE PROBLEM

it sounds like your blue convergence ic is getting weak you need to replace the ic's STK392-110 and you should replace both because when 1 is bad the other will go real soon. They are inexspensive at the sight I posted and you will also get free tech online support if you purchase them there.
http://servicemanuals.vstore.ca/

SOURCE: blue circle in center of screen hitachi 55vs69a

The Light Engine is causing this.

SOURCE: My hitachi 50VS69A tv shows the picture green.

A green image is usually due to a lack of red or especially blue. the problem is becoming all too common with hitachi lcd projection sets. what happens is that one of the lenses in the optical block (or light engine) starts to burn or discolor due to overheating because of a blocked air filter causing poor air (cooling) circulation. Nothing can be done when the damage is too far gone except to replace the light engine-at acost that makes it not worth repair. if the damage is minimal than to reduce further damage the air filter should be replaced. Light engine needsto be removed in order to replace the air filter.