Samsung PN42C430 Plasma no picture please HELP

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

ok, one sec. I have the LJ41-08592 Y-main in front of me.

Ok

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Hmm, I'm noticing anything out of the ordinary. 2, 3, and 6: You can further test by holding black on pin 3 while quickly touching red to pin 1 then moving red to pin 2. Should get something like 0.5V.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Hmm, I'm noticing anything out of the ordinary. 2, 3, and 6: You can further test by holding black on pin 3 while quickly touching red to pin 1 then moving red to pin 2. Should get something like 0.5V.

You are noticing something wrong, or your not noticing anything?

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

You are noticing something wrong, or your not noticing anything?

Sorry, NOT noticing anything strange.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Sorry, NOT noticing anything strange.

Oh ok, I did the test on 2 3 and 6 and they are perfect as well.

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

I wonder if the VS and VA voltages stay up without the Y-buffer connected. I'd be careful if you try that. I've found that the Y-main holds a charge, so you could possibly damage the Y-buffer if you don't wait for the charge to dissipate before reconnecting them. I had to wait at least 15 mins, and I checked voltages at the Y-main-to-Y-buffer connectors to be sure. You can force the discharge by using a resistor on the Y-main's capacitors (one resistor lead on pos and the other lead on neg) - can't remember the resistor value needed to do this.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

I wonder if the VS and VA voltages stay up without the Y-buffer connected. I'd be careful if you try that. I've found that the Y-main holds a charge, so you could possibly damage the Y-buffer if you don't wait for the charge to dissipate before reconnecting them. I had to wait at least 15 mins, and I checked voltages at the Y-main-to-Y-buffer connectors to be sure. You can force the discharge by using a resistor on the Y-main's capacitors (one resistor lead on pos and the other lead on neg) - can't remember the resistor value needed to do this.

Just tried that since the board been out of the TV all this time while I was doing the testing on it and the values still don't hold up without the Y-Buffer connected

[1997eclipsegst]

Re: Samsung PN42C430 Plasma no picture please HELP

The tv I worked on was a RCA 42PA30RQ with these Samsung internals. The power supply would not stay at panel voltage with the X-main disconnected.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

The tv I worked on was a RCA 42PA30RQ with these Samsung internals. The power supply would not stay at panel voltage with the X-main disconnected.

Well that explains that then, thanks for your input.

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Well, I'm out of ideas at this point. Maybe Tom has other thoughts.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Well, I'm out of ideas at this point. Maybe Tom has other thoughts.

Ok thanks for all your help and I hope Tom can chime in with any ideas.

[tom66]

Re: Samsung PN42C430 Plasma no picture please HELP

These newer Samsung will shut down if X-main or Y-main are not detected as functioning or if they are not connected.

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Since they're so cheap, I might give another X-main a shot. However, I'd test the components on the board before installing it in the TV. If that doesn't work and the X-main blows, I'd probably replace them all at once. I still think there's a fault somewhere on the Y-main or buffer. I generally hate throwing parts at TVs, though.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Since they're so cheap, I might give another X-main a shot. However, I'd test the components on the board before installing it in the TV. If that doesn't work and the X-main blows, I'd probably replace them all at once. I still think there's a fault somewhere on the Y-main or buffer. I generally hate throwing parts at TVs, though.

Ok boys im going to start fresh, shop jimmy is sending me 2 other Y-Main and Y-Bufffer boards and I was able to source an X-Main here in my city from an authorized Samsung repair shop the board is brand new for $55. Ill wait till I have every board then test each one with the meter then install all at same time and fire it up and see what happens. Ill keep you all posted.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Ok boys im going to start fresh, shop jimmy is sending me 2 other Y-Main and Y-Bufffer boards and I was able to source an X-Main here in my city from an authorized Samsung repair shop the board is brand new for $55. Ill wait till I have every board then test each one with the meter then install all at same time and fire it up and see what happens. Ill keep you all posted.

Good news guys, I got all 3 boards tested them all with the multimeter, they all tested good, put them all in and TV is up and working again. Thanks for all your help.

[capkid]

Re: Samsung PN42C430 Plasma no picture please HELP

Good news guys, I got all 3 boards tested them all with the multimeter, they all tested good, put them all in and TV is up and working again. Thanks for all your help.

Nice. Even though we couldn't pinpoint the issue on the Y-Sus, I figured it was likely you'd have to replace all three boards.

[tom66]

Re: Samsung PN42C430 Plasma no picture please HELP

Remember!! If you don't want your TV to fail in short order you MUST apply the firmware update!

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

Remember!! If you don't want your TV to fail in short order you MUST apply the firmware update!

Even if I have updated it before with the newest firmware? I updated it just before it failed. changing the x-mail, y-mail and y-buffer doesn't destroy the new firmware I put onto it does it?

[tom66]

Re: Samsung PN42C430 Plasma no picture please HELP

That's fine then, firmware is stored on control board and main board.

[sergio2013]

Re: Samsung PN42C430 Plasma no picture please HELP

That's fine then, firmware is stored on control board and main board.

Ok, good that's what I thought. Thanks for your help.