Re: Vizio e550i-B2 - one active zone too dim?
Oh ok, my apologies I misunderstood..
I guess I was hoping it was some kind of software/firmware problem telling the set to try to dim that zone incorrectly
jaxmc1023
Member
Last Activity: 11-05-2014, 04:19 PM
Joined: 07-28-2014
Location: Lafayette, LA
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Re: Vizio e550i-B2 - one active zone too dim?
According to Vizio, this unit is supposed to have full-array backlighting.. that's why it seems so strange that one corner in a perfectly defined "zone" would have issuesLeave a comment:
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Re: Vizio e550i-B2 - one active zone too dim?
Yes it's only a few months old.
Was just wondering if this is common in these "active zone" LEDsLeave a comment:
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Vizio e550i-B2 - one active zone too dim?
In August, I bought a 55" Vizio e550i-B2 LED to replace a Samsung LCD that failed.. It worked great until yesterday, when I noticed that in the bottom left corner, there is a rectangle that is darker than the rest of the screen.
I will post a picture of the screen itself when I get home today..
This model has the "Active LED Zones" feature.. I did not have this feature turned on, and turning it on or off causes no change to the dark area. Changing sources does not change it either. Running through the color test patterns, the dim rectangle is still... -
Re: Help identify boards in Samsung plasma
Tom -- you think those dark spots in the screen flicker might indicate the panel itself has failed?Leave a comment:
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Re: Help identify boards in Samsung plasma
Jumpered VS_On with 5.3V. All voltages (Vs, Va, Vsc, and Ve) come up and stay up. Va still only reaches 50-52v, and Vs keeps climbing past 240v. No picture -- only flashes white noise once as shown in the photo above.
I've changed pretty much every board in this unit except for the main board. It's probably worth noting that if I put the old X/Y Main and Y-Buffer back in, I do not get the picture flicker at startup.Leave a comment:
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Re: Help identify boards in Samsung plasma
Replaced power supply -- all voltages exactly the same. Va still showing 50v when panel is calling for 58v.
I've checked all over the X/Y Main and Y-Buffer, and can't find a short anywhere.
The only other thing that I'm noticing that seems strange, is the voltages for the IR sensor/switch are a little off -- at least according to the fasttrack. Standby voltage is correct at 3.3v, but the guide says all other voltages should be 3.3v also. None of the other voltages - key 1 or key 2 -- is higher than 2.0v....Leave a comment:
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Re: Help identify boards in Samsung plasma
I've got another power supply coming in.. Was supposed to be delivered today. Looks like it's going to be late, of course.
I'm out of ideas otherwise. I can't find any shorts on X/Y Main, Y-Buffer, or anywhere else. All voltages do exactly what they're supposed to do, except Va is short by 10volts. Then they all just drop outLeave a comment:
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Re: Help identify boards in Samsung plasma
I turned the Va adjustment Pot as far as it would go, which was only about a half turn. The Va barely reached 51v.
I found the Ve test point, and it reads 102v -- sticker says it should be 91v
Tried adjusting Pots for Ve and Va, but can't turn either of them enough to move them more than 1-2 volts..Leave a comment:
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Re: Help identify boards in Samsung plasma
You think it's risky to turn that pot enough to go up 8 volts? IF that were the root cause, that would pretty much point to a faulty power supply, wouldn't it?...Leave a comment:
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Re: Help identify boards in Samsung plasma
OK. I won't be able to mess with it until I get back home.
Assuming the VE does the same as the Vsc (rises to normal level before falling off to 0), is there any danger in trying to increase the Va up to its expected level of 58v?
I turned the pot at Va last night about 1/8 of a turn, and that increased it maybe 1v. Was afraid to go much further than that
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Re: Help identify boards in Samsung plasma
Do you think it matters which of those two wires at "VE JP" i test across?Leave a comment:
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Re: Help identify boards in Samsung plasma
There is a VE voltage listed on the panel sticker, but I can't seem to figure out which Test Point I should test at
The only one that looks similar to the VSC test point is marked "VE JP"...Last edited by jaxmc1023; 08-07-2014, 08:08 AM.Leave a comment:
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Re: Help identify boards in Samsung plasma
Vs on power supply is 209v (right on the money)
Va is only 50v - supposed to be 58v
Vsc on X/Y Main is -184v which is perfect, and it actually holds for a few seconds before shutting down
According to the fast track, the VA travels through the x-buffer, then through the logic buffer on the bottom of the panel, before reaching the logic board
I don't think the y-main is at fault because it generates the correct Vsc before shutting down.
Can a Va that's too low signal the logic board...Last edited by jaxmc1023; 08-07-2014, 05:09 AM.Leave a comment:
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Re: Help identify boards in Samsung plasma
I put the old X/Y Main board back in with the replacement Y-Buffer. Unit turns on, startup jingle, NO PICTURE CHANGE, and voltage drops out
Took the old back out.. put in the replacement X/Y Main. Unit turns on, startup jingle, brief split-second flash of white noise, and then voltage drops out
Is this useful info?
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Re: Help identify boards in Samsung plasma
What would be your next move? I can't find any shorts on the Y-Buffer (the old one or the new one).. Stand-by and PS_On voltages are correct. VS and VA voltages are correct for a brief moment, but drop out as soon as screen flickers white noise for a split second.
If I put the old Y-Sustain board back in, would there be any reason that it would damage the new Y-Buffer? or is it always the other way around -- Bad buffer blows Y-Sustain.Leave a comment:
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Re: Help identify boards in Samsung plasma
I'm pretty confused now.. Everything I'm reading is telling me that Part# BN96-22107A is referred to as a "X/Y Main Board" or "X/Y Sustain"..
The power connection to the Sustain board has 13 pins -- Pins 5 thru 10 are all marked "X-Out"Leave a comment:
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Re: Help identify boards in Samsung plasma
"control board" meaning Logic board or the main board with inputs?Leave a comment:
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Re: Help identify boards in Samsung plasma
Wow, well that's interesting news..
So, looking at the picture in the original post, there is no way to isolate the X-Main from the Y-Main/Y-Buffer is there? The boards on the left side cannot receive power without power first being provided to the X-Main, correct?Leave a comment:
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Re: Help identify boards in Samsung plasma
So the X-Main is NOT combined with the Y-Sustain/Main board? It is actually part of the long skinny board on the right side of the panel?Leave a comment:
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