Samsung DP50747 Powers on then off

[ad1982]

Re: Samsung DP50747 Powers on then off

Can anyone point me in the right direction as to what the logic board led lights mean? When powering up, all 4 light up, d3 through d5 go out really quick, then d2 goes out along with the 2nd relay click about 2 seconds after the others go out. Right before d2 goes out, I get a brief flash from the screen...it pops on then off right away.

[Shane711]

Re: Samsung DP50747 Powers on then off

I got this problem, turn it on and then 3 seconds it turns off. SO I been doing a lot of reading and there is a power failure circuit shutting it off. Checking the voltages on the PS I am getting readings just under the stated voltages. So how do I fix this? Is it a bad cap or something else? So I checked the biggest caps and they are a little lower than the rated value. 680uf was 635uf. 820uf was 810uf. 2 270uf caps, 1 read 270 and the other 265. The ESR values are .25 ohms or less so I guess the ESR values are good. I am going to keep checking caps but I have no shorts on the board.