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John, my thoughts is something in the main power supply. I don't know what an opto chip is but I've heard of Optocupler IC's. May be a good idea to give a call to some local TV Repair Shops especially ones that work on Philip's and see if you can speak with a tech to see what their thoughts are on what the problem is and what a repair cost may be. The issue is one of hauling it to the TV shop or having them come out to you. Blessings, A/V Media Guy
This sounds like the coolant fluid needs to be changed - the coolant turns milky after awhile and you'll get a dull image.
Google TV repair world . com and look for philips/magnavox coolant replacement:
PHILLIPS CRT Coolant Replacement Kit
This is the complete coolant kit for Phillips CRT rear projection televisions. Kit contains 48oz of top quality High purity optical grade coolant with complete detailed instructions produced in clear easy to understand terms with detailed photos and illustrations that takes you through the process step by step safely dischargeing the CRTs and eliminating the need for complete realigning proceedures.Restores the vibrant colors and focus issues commonly associated with coolant that needs replacement
You will need to replace the CRT coolant and your color, and clarity will be restored to like it was when it was new this is a common problem for Phillips and magnavox rear projection TVs. You can get the complete kit at the following link which contains the 48 ounces of CRT optical coolant and a CD with the instructions on how to do the proceedure with pictures. They alos have free on line instant messageing tech support just in case you need additional help. And the entire kit cost less than just one tech comming out to look at it. Heres the link its listed under their repair kits catagory. http://servicemanuals.vstore.ca/
If decide to do yourself, ya only have to do the green and blue ones, the red light spectrum won't allow fungal growth. Pull whole CRT assembly out to prevent spilled/leaking glycol from onto lower main boards
This denotes a problem called blooming the horizontal lines you see are called retrace lines this is caused by the increase in anode voltage which could be caused by an increase in HV section current which trips the overcurrent protection dircuit and turns the TV off.If you do not have electronics experience I would suggest taking the set to a TV repair shop.