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Louie
Louie, Technician
Category: TV
Satisfied Customers: 2557
Experience:  25+ yrs. experience in the field and 5+ yrs. online, down to component level.
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Read this post on the Samsung PN51D530A3F, VA is 45v and VS

Customer Question

Read this post on the Samsung PN51D530A3F, VA is 45v and VS is 140v, guess that means power supply is bad?
Submitted: 1 year ago.
Category: TV
Expert:  TV Tech1 replied 1 year ago.

Does it rise up if you disconnect the board to the Left of the power supply? That's the Ymain board, and it's the main load the power supply feeds.

Customer: replied 1 year ago.
No, that was reading with Ymain disconnected, It will stay on if either board is disconnected, but connect both and it blinks read 5 times or so and then turns off
Expert:  TV Tech1 replied 1 year ago.

but connect both and it blinks read 5 times or so and then turns off

That's enough time for the TV to turn on those boards..certainly the power supply is bad, but let's not damage the new power supply too. Did you do an Ohm or Continuity test from Vs / Va to ground on the boards ? Does the logic board's green led light blink once a second OR does it light up once, and shut down when the rest of the TV shuts down? It's nice to know that before commiting resources to the TV.

Customer: replied 1 year ago.
I misspoke, the tv turns off immediately with all boards connected, the green light flashes once and then goes out with the rest of the tv...either board disconnected it blinks red 5 times and stops but the green light will still be on in the back, blinking
Expert:  TV Tech1 replied 1 year ago.

Ok, knowing that..the Ysus and xmain board are both suspect in damaging the power supply board and causing that voltage drop on it.

You should use your meter's beeper/continuity test on the power supply board's connection to the Ysus/Ymain plug, measuring the VS to ground/GND. If it's low/shorted, unplug the Xmain and see if the resistance shoots up. That means the Xsus is shorted. If it stays low, then the Ysus/Ymain is shorted.

Use the pictures below to help you with that low resistance/shorted test --