I got a Samsung plasma model PN51d550C1F , this is a 3D TV, couldn't power on, relay clicked a few times and stopped.
Open cover and measured the VA and VS, both zero. But 15v and 5V were fine, the digital board led flashing, this is normal.
Unplug the x-sustain board, plug the power cord, there was VS (207V) and VA(58V), but it dropped gradually to 0V. This may mean the power supply was good, the y-board was good too, problem was the z-main board.
The part number of this x-main is LJ41-09422A, REV 1.3(11/06/20), took it out and checked many MOSFETs were shorted.
I happened have another x-main board, the part number was the same, V1.3 (11/02/11), version was the same but manufactured date was different. this board was pulled from a cracked screen non 3D plasma PN51D450A2D.
I compared the parts, not exact the same, obvious the 3D one had more caps and MOSFETs, see first photo (3D), second (non 3D).
I replaced the bad 3D x-main with this non 3D one, it works perfect! Cheap solution !
Open cover and measured the VA and VS, both zero. But 15v and 5V were fine, the digital board led flashing, this is normal.
Unplug the x-sustain board, plug the power cord, there was VS (207V) and VA(58V), but it dropped gradually to 0V. This may mean the power supply was good, the y-board was good too, problem was the z-main board.
The part number of this x-main is LJ41-09422A, REV 1.3(11/06/20), took it out and checked many MOSFETs were shorted.
I happened have another x-main board, the part number was the same, V1.3 (11/02/11), version was the same but manufactured date was different. this board was pulled from a cracked screen non 3D plasma PN51D450A2D.
I compared the parts, not exact the same, obvious the 3D one had more caps and MOSFETs, see first photo (3D), second (non 3D).
I replaced the bad 3D x-main with this non 3D one, it works perfect! Cheap solution !
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