Originally Posted by ChuckF.
Our UHP lamps are arc-lamps, so good or bad they will always test out as 'open circuit'. That's why lamp/ballast troubleshooting has an element of trial and error.
Define shortly after. If this is a minute or two it may be time for the lamp area to heat up and if the lamp fan is not moving enough air the overheat switch could be triggering. That switch could also be triggering too easily. A lamp fan can get so clogged with dust that it can't possibly move air, yet still turn freely and therefore not go into alarm.
Re quick flash of light, sounds like the lamp is lighting promptly on the first try, that's good.
Is it the ballast? Possibly. They don't go often on Sonys as on some other makes, but they can go bad. I'd also check the wiring between the ballast and the lamp from the back of the tv. The connector on the tv side gets hot and the plastics can crumble with age and all that heat.
Are the other wires in the back of the set still dressed more or less as Sony intended?
This time are you getting any flashing LEDs in front in a pattern that correspond to a service message?
Between using the old lamp and the new lamp, make sure have unplugged the tv for a few minutes.
My SM only shows the -12 number. Ballasts are pretty cheap, $40-50. Ebay, partstore.com, shopjimmy.com, sometimes amazon; some of the lamp sellers even sell ballasts too. Do a google search on "1-468-936-12 order online".
Shortly after == about 5 seconds.
I turn the TV on, fans start, lamp fires for 5 seconds, turns off, 15-20 seconds later lamp lights for 5 seconds, off, 15-20 seconds, lamp fires a third time, stays on for 5 seconds, system turns off. Lamp LED on front steadily blinking, meaning - it does not blink 3 times, pause, blink 3 times. It just continues to blink.
See lamp fire up, then turn off - it does this series you are about to see 3 times, then gives up:
This is looking into the bulb "tunnel" with the cover removed and me tricking the door sensor that it is closed.
Wiring that I can see looks good - no heat damage or crumbling. All other wires are untouched since new. This thing is in great condition.
The old lamp never even fired up, so this new lamp (for the 5 seconds it is on) is at least a step in the right direction....isn't it?
Should I replace the ballast next, then? Or is it time to junk this and put the debug money on a new set? Anyone need a brand new Philips?