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Dark pictures after a lamp change normally indicate that the lamp isn't aligned properly, or that it has been touched with bare fingers and caused a black mark, or it's an inferior (budget) lamp.
No, you do not have a bad circuit board, the problem is still from the lamp you fixed on it. Have it checked once again to see to it that there was no slight difference in the way you have been fixing it.
If you have a bad circuit board, there would be a complete alteration in the functioning of the television.
Since the problem has to do with the lighting and picture of the television, it has to do with either the lamp or t-com board, so check them both.
This model is notorious for needing a new lamp about every 2 years. The lamp is accessed through the front by removing the long plastic cover under the screen (it just pulls off). Under that, to the left of center, is a square cover with one grey plastic screw. Loosen the screw and pull the lamp assembly out. It should just slide right out. Turn it around and look at the lamp. If the lamp face or reflector looks "cloudy" or "misty". Replace the lamp with Philips part number TY-LA1000. Just Google the number and you will find them available for around $100
If it is dark because of an adjustment the "picture" adjustment would make a difference.
The most likely cause of a dark picture on this type of set would be the lamp getting near the end of it's life. This set should use part number, A-1606-034-B and is something you can probably change yourself, check your owners manual, it shows how. Follow the instructions and remember to have the power chord unplugged while you are changing lamp and to put the lamp door back on the set before you connect the power chord again.
We changed the lamp too.Picture is very good now. There isn't a way to test lamp because it is filled with gas.when changing lamp make sure you put everything back on covers etc. before checking to see if it works.
there are 2 clocks 1 for lamp and 1 for total, the total you cant change. dark picture, make sure your got same wattage lamp for replacement, I find original Philips lamps the best. if it continues follow manufacture instructions on cleaning mirror and lens.
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