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3425 posts

Uber Geek

  #2050965 7-Jul-2018 09:35
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You would expect the TV to draw more amps while in standby and running a Pixel Refresher than it does while in standby when not running a Pixel Refresher. So I plugged the TV into a power meter and did some testing. Got some interesting results.




1. If I turn the TV off after less than 4 hours cumulative viewing, the draw drops to 0.13 after about 4 seconds of turning the TV off, so I used this as my baseline.


2. If I turn the TV off after greater than 4 hours cumulative viewing, the draw drops to around 0.31 for about 6 min 20 sec, it then drops to 0.13 (baseline). I'd read that the automatic Pixel Refresher takes approx 7-10 minutes, so I think this is close enough to assume that it is working.


3. Here's where it gets interesting. The manual Pixel Refresher is meant to take approx 1 hour. When I trigger one of these, the draw drops to 0.31 for a bit over 5 minutes it then drops to 0.13 (baseline). This is not what I would expect. But here is the kicker. This time the bloody TV did turn on again automatically! Unfortunately I didn't time this as I wasn't expecting it to happen, but I would guess maybe 45 minutes. It did still have a message saying the Pixel Refresher had been interrupted on the screen when it came back on.




2 tells me that the automatic Pixel Refresher is most likely running as it should. This is reassuring, as that was my biggest concern.


3 tells me that the manual Pixel Refresher tries to do something, but doesn't complete the full process. But at least I can be somewhat reassured that the few times I have tried to run it and left it for hours that it looks like it hasn't been going crazy trying to refresh the pixels over and over for hours.


Pure Speculation:


I personally see 4 possibilities (and again, complete speculation on my part):


A. The manual Pixel Refresher starts, but for some reason the TV goes into full standby mode and powers down before it finishes.


B. The manual Pixel Refresher starts, but for some reason fails after 5 minutes.


C. It is a two stage process where it runs a mini cycle followed by a full cycle. The mini cycle completes, but the full cycle fails to start.


D. It is a two stage process where it runs a mini cycle, which then determines whether it needs to run the full cycle. If it doesn't need it, then it doesn't run. This is actually pretty close to what LG support initially told me, but contradicts anecdotal reports I have read. If this is the case though, they should fix the software so it doesn't give you the error message when you turn the TV back on (and update the description to say it only runs if required).


3425 posts

Uber Geek

  #2051069 7-Jul-2018 12:57
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Another update:


I wanted to reproduce result 3, but time how long it took before the TV came back on automatically. This time the amp draw dropped to 0.31 for the same approx 6 min 20 sec as it does during the automatic cycle, then dropped to 0.13 (baseline). But this time it was about another 2 hrs 45 min before the TV turned itself back on. I periodically checked the amp draw and it was at was at 0.13 every time I checked, so it looks like the TV was doing nothing at all in that time.


I think it's a firmware bug, possibly specific to only the Australasian C8PTA models.


If I were a betting man, I'd go with theory D from my speculations in my last post. I'd guess all the processes and functions are running correctly, but a firmware bug is causing it to turn back on after a seemingly random time (or not at all), and to  display the message about it the process being interrupted. Possibly something as simple as it not setting a "completed" flag if it determines the full process wasn't needed (another guess on my part). The idea of the TV being smart enough to only run the full 1 hour Pixel Refresher cycle would also explain why LG doesn't give the same warning as Sony does about running it too frequently.


Obviously take all of this with a HUGE grain of salt, as it is just a theory that seems to fit what I am seeing.


But I have lots of info now, so it will be interesting to see what LG comes back with.


P.S. I'm not crazy, I just like to get to the bottom of potential issues or peculiarities I discover - especially when it involves a rather significant dollar investment.





3425 posts

Uber Geek

  #2051408 8-Jul-2018 12:41
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Well, just as well I'm not a betting man.


Went back to reseller today to collect my new receiver and spoke to the sales rep at the same time about the Pixel Refresher.


We triggered a Pixel refresher on their floor model and the amp draw dropped to about what I saw on mine during a regular cycle for 6 or 7 minutes, then dropped right down to regular standby level. However; after an hour it displayed a Pixel Refresher In Progress message and ran a horizontal white line down the screen for a few seconds, then switched back on and said the Pixel refresher had completed.


Exact same model and firmware as my one, so a firmware bug seems unlikely. The only difference is the number of hours on the panel, mine is approaching 300 where their floor model was over 800.


I've also read on a forum that they talk about mA draw of the panel, and not the amp draw of the power supply which is all I am able to measure. So I may have been working on some false assumptions, and now I don't know if my measurements actually give any meaningful indication of whether it is running a process or not.


3425 posts

Uber Geek

  #2055305 12-Jul-2018 19:54
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Had my LG C8 exchanged, and the replacement successfully completed a manual Pixel Refresher cycle. 

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