Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

[high-tech]

Hello and good morning everybody!

I don't have much knowledge or exp w plasma TVs.

I uploaded to youtube a little video showing what this tv does and has no sound but the screen goes on and off with weird picture, just a bunch of stripes and random lines ect


http://youtu.be/8OBIuRy_EXE


Any help would be a blessing, Thanks

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

[youtube]8OBIuRy_EXE[/youtube]

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Check the Vset and Vs voltages on the sub-PSU board, which connects to the main PSU board.

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Thank you, I will do that and post my results

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

VS is 212v to 215v and VA is 72v to 75v these voltages jump around as the screen goes on and off. I can't find a vset to test

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Vset is on the small second power supply (one of them?), there should be a point to test it. Do the Vs and Va match the rated voltage written on the panel sticker? (on the metal chassis)

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Check the Vset and Vs voltages on the sub-PSU board, which connects to the main PSU board.

I got 215v on the VS pins and 75v on VA pins. they both jump around a few volts while the screen cycles on and off

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

coming off the sub power board to each sustain board the voltages are higher, VS going to the ysus board is 265v to 360v and VS going to xsus board is 209v to 215

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

If I'm seeing this right that big of a voltage drop on the YSUS board would lead me to think I got problems on the YSUS board. What you think TOM66?

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Vs should be the same for both boards, not different. Where are you measuring Vs on each?

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

The VS pins on the SUS boards each connector has a black wire and a bunch of white wires and the black wire on both connectors is the VS pin, I'm double checkin now

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

My secondary findings are still the same... the voltages coming off the sub power board to each SUS board on the VS pins is not the same. the main YSUS board is higher than the XSUS board

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Can I see a picture of each sub board?

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Evidently I got a bad meter, strange readings. I pulled out my spare meter and all the voltages are close to the panel sticker.
Panel sticker says VA 70v VSC-190v VS 201v VA 84v VSET 195v
My meter says VA 70v VS 201v VA 87v VSET 199v

I can't find the VSC to test???

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

VSC is on the Y-main/Y-sus board.

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

I had to remove them in order to get a good pic

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Vscan = -Vsc and Vset are testpoints on the topmost board.

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

Alright I put the boards back in and found VSCAN and it is -198. So what's next?

so all the voltages are ok

[tom66]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

No cycling as it flashes?

[high-tech]

Re: Samsung Model HP-R4272V/XXA 42in Plasma screen flickers

all the voltages fluctuate a little a few volts but no I don't have to reset a fault by cycling the power or unplugging ect. The screen will flash as long as I leave it powered on.