mitchell0715
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Sep 15, 2015, 11:48 PM
Post #1 of 4
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Samsung PN51E450A1FXZA No standby, good PS
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I'm pretty new to the world of circuit troubleshooting, but I've got enough knowledge to get me through the basics with a little help.
TV was struck by lightning, took it to a local repair place and got a free estimate - $280 and a bad power supply. Bought a new power supply from SJ and put it in tonight, still no standby. Tested the voltage at the fuse and got 124ACV referencing the ground on the bottom left of the board.
Then checked what I believed to be the power pin for the main board(with the RCAs, hdmi, etc?) and got ~44v referencing the PS board ground. Checked the board on the far right of the TV on what I thought was the power pin and got about 4-5v ACV (not sure which pins are AC and which are DC to be honest).
Checked the voltage out of the main board (again, i think its the main board), and got nothing when referencing the screw ground on that board or the PS ground.
There's a visible dark mark on the largest board on the left side, has large heatsinks and multiple caps but they don't look swollen.
Logic board doesn't light up at all, nor the standby.
Does this sound like I should try to replace the main board next?
Just saw there's other people who have had this same exact problem and it was fixed by replacing the main board, so I'm going to take a chance and order the board from SJ in hopes that it fixes it. Probably end up returning the other PS if it tests out working.
here's the part. Samsung BN94-06039B
looks to be out of stock on SJ, is there another reliable source that provides free returns in case it doesn't fix it?
I do have an oscilloscope to use if necessary, although its bandwidth is a bit limited and won't read accurately above 50khz or so.
(This post was edited by mitchell0715 on Sep 16, 2015, 12:35 AM)
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