Hi W Bloom,
First of all, thank you for contacting Fixya.com regarding your TV problem.
My first advice is to do system reset by pressing the "Power" button key at the front panel and hold it for 10 secs.
Please check also if you can access the "Error Code Log" by pressing the "Menu" "3" "5" "6" "4" in sequence before the unit gone to shutdown.
You've mentioned that the bulb has been replaced just last Sept and now it won't come on. The lamp can't be test using the multimeter but you can make a visual inspection to determine its condition. Most of the faulty lamp has an obvious burnt mark. There's a possibility that the symptoms is caused by busted lamp but in your case, if it is a genuine lamp replacement, then high chance that the fault is not the bulb.
You need to check the ballast board but not the high voltage output of it feeding the lamp. No voltage coming out from the power supply board to the ballast board can produced the same symptoms. You have to check the this voltage at connector CJ1, you must get 325V to 340V. Check also the lamp enable at connector CJ3(pin 4) you must get a low voltage upon turning on the set to confirmed that the mainboard giving a signal.
If there's no voltage at CJ1, then the fault is on the power supply board.
If the readings are normal, and still the ballast won't ignite (you can hear a slight snap sound when the ballast board trying to ignite), then you have to replaced it.
Click the link below to order online.
http://bigtvsale.blogge.rs/2011/05/31/discount-replacement-mitsubishi-oem-pwb-ballast-938p178010/http://www.shopjimmy.com/mitsubishi-938p178010-lamp-ballast.htmPlease let me know if you need further assistance.
Good luck and take care!
Kind Regards,
Mjsazon
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