Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

[Sevenqi]

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 !

[tom66]

Re: Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

The problem with this is you've reduced the power handling capability of the X-main and the ER circuit is mismatched. The D450 X-main will likely fail soon, or it will kill the Y-main.

[ehboy]

Re: Samsung 3D plasma PN51d550C1F fixed with non 3D X-Main Board

Glad I found this. Having a devil of a time sourcing a 3D y main. Lots from the d450 2D models out there, but few for what I need.

I notice mine are large lettered DFG as opposed to this 3D one which seems to be just DF.

So tom, I would assume I should take this info under advisement and source the proper one?

My revision number is 764D, which seems rare, but 764A would work perhaps?

Thanks.