Re: Lg 50pv450
Still the same result. No white fuzz even when not connected to a video source. The screen is not completely lit, then half lit, then off.
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Re: Lg 50pv450
Sorry for the delayed response. Finally got a good meter home. World of difference that makes!
So, with the ysus unplugged from the panel and Zsus, I dialed in the voltages spot on. Waiting for the caps to dissipate before reconnecting. Just excited to use a good meter.
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Re: Lg 50pv450
I will. I have a better tool at my office I will procure for an evening.
Am I measuring the correct points?
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Re: Lg 50pv450
And, thank you for all your help with this. I really appreciate it.
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Re: Lg 50pv450
I disconnected the Ysus side connections from the two adjacent (left) boards, which I believe are the buffer boards, correct? I also disconnected the power from the Ysus to the Zsus board. I left all the ribbon connections intact.
I then powered up and attempted the measurements again. They did not drop off, but they also where much higher than I have previously read. They fluctuated still, bouncing between 500 and 400. I adjusted the pots with no real change in measurement. Now I am questioning my measurements. If I simply probed the board I read a...Last edited by TennesseePaul; 10-14-2013, 05:51 PM.
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Re: Lg 50pv450
Interesting. So if the board is OK, then it is normal to drop voltage over time for the two points?
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Re: Lg 50pv450
Tom,
Well, that is nice to know. So, as far as we know, the panel is still good and there's a high probability of the Y-SUS being bad, correct?
Is there anything on the board, like an LED, which would denote a fault has occurred? I ask because, I haven't paid the logic board much attention, but I did notice when I had the lights out viewing the screen yesterday that there is an LED on the logic board which was blinking. It was the first I'd noticed it so I do not know if that is new or not.
Tennessee Paul
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Re: Lg 50pv450
Hi Tom,
Unfortunately I do not. So you think both buffers need to be replaced? Could it be a bad panel?
Also, is it normal for the volts to drop as I am seeing?
Tennessee Paul
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Re: Lg 50pv450
Hi Tom,
I have attempted adjusting the volt. I believe I am close but it is difficult to tell as the voltage drops over time. Still no improvement in image.
Tennessee Paul
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Re: Lg 50pv450
I'm able to measure the change in resistance on the pots. Turning counter clockwise reduces the resistance on the +VY pot.
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Re: Lg 50pv450
Hi Tom,
Attached is the image.
Tennessee Paul...
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Re: Lg 50pv450
Hi Tom,
Do you know which direction goes up/down? The voltage doesn't ever hold making it difficult to tell if I'm changing any thing. I see 4 pots on the ysus. I believe I have the correct 2, they are the only two with these labels near them. But when I adjust them there isn't a noticeable change.
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Re: Lg 50pv450
Hi Tom,
Will do. Is it normal for these V's to drop off?
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Re: Lg 50pv450
Hi Tom
I tested the Vs and Va on the power supply. Each were a volt low. I adjusted each then tried the TV again. It had the same result. On for a moment then to black.
Tennessee Paul
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Re: Lg 50pv450
Vsc starts off high. Around 178 but falls off to 0.
Vy starts off high, over 200, but falls off quickly and ends at 0.
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Re: Lg 50pv450
Yes. It was different. In a few I will post the results of the meter.
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Re: Lg 50pv450
Interesting. Could I have jumped poorly? I did not solder. I just put a wire end in each.
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