Samsung PS42C450B1W

[viduka]

Hi.
Looking for some help please.
Got a Samsung PS42C450B1W that will not come out of standby.
If I disconnect the Logic Board from the PSU the TV powers on but obviously with not picture. The TV is showing nothing on the VS (should be 210) and only 0.6 from the VA (should be 54). The connection for the Logic board on the PSU should have Pin 1 and 2 at 5.3v but both showing 10.8v.
I've tried a replacement power Board and Logic board but have the same issue. I've attached pic of the boards. Any help would be much appreciated

[tw2005]

Re: Samsung PS42C450B1W

The Tv is in protect, xmain commonly short.

Replacement of xmain,ymain & buffer all at once (with good boards)should
get it going. If you know how to test these you may work it out better. xmain would be the primary culprit + do firmware upgrade when you get it going. X can kill the ymain so if you can prove buffer is good doing x & y together is a good idea or you may end up going in circles as each can kill the other

there should be plenty of threads on this model and any related model around the world. try a model search or search the xmain and ymain board numbers. equivalent US models start with PN.

I have a known good buffer if you want to compare readings

[Alastair E]

Re: Samsung PS42C450B1W

Control-board Detecting fault/issue with either X or Y, and shutting down in Protect Mode.

Replace All Three (X,Y,and Buffer) At The SAME TIME with KNOWN good boards--Or you'll go round and round in circles killing good boards with dodgy ones....
--Any from sellers or fleagay should be checked for issues and shorts before fitting, as All those vendors Dont Properly Test 'em before sale...