Originally Posted by Since 2/96
ok...gonna revive this thread after almost 5 months and see if I can't get any help...my 55" began losing picture and audio periodically a few weeks ago. I'd turn the set off and back on and it would work ok for sometimes hours and eventually those hours turned to nothing and now, with the current bulb that I replaced a little over 3 years ago and the original bulb that I had kept and re-installed after this latest issue, I get nothing. Could I simply need a new bulb that works and hope that I get a picture again or do I have a ballast or optical block problem? I almost don't want to invest the $100 or whatever on ebay to get another bulb if it's one of the other problems. How do I tell if it's something else other than just the bulb at this point? Any help/theories will be appreciated. I've had this set one month shy of 7 years.
Yes you may just need a new lamp. Three years is a good expectation for lamp life.
It can be difficult to distinguish between a lamp failure and something else related to the lamp. When it shuts down do you get a lamp failure or other failure indications on the front panel LEDs?
A hot lamp is more difficult for the ballast to operate than a cold lamp. As the lamp ages, it also becomes more difficult to operate because the arc gap grows.
These models are also notorious for plugged-up lamp cooling fans which will shorten lamp life or cause thermal shutdowns. If you can take off the back and take a look at the lamp's main fan, you might see that.
If you replace the lamp, get a genuine Sony, a Philips or an Osram. If you get a cheap knockoff lamp from ebay your troubleshooting process can get messed up because the knockoff lamps have a high failure rate out-of-the-box and if they work they don't last longer than a few months. Count on spending $75-90.