I have 2 plasma tvs that I am working on. they are both the same model. One of them is flickering. The other has some static on certain parts of the screen. I have tried switching the power supplys on them and the problem stays the same. So I think that can rule out the power supply. The model of the tv is LG 50PC5D. I am good with electronics but just starting to get into tvs. Any help would be great. I will post some pics soon. On the flickering one you can only see it when Something is plugged in. When it has no input th only thing that flashes is the no input thing.
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Re: Help with Plasma tv.
Anybody have any ideas? -
Re: Help with Plasma tv.
Ok well I have made some progress with the one that is flickering. Yesterday I unhooked the buffer boards, Then when I plugged them in it was working perfect. Left it on for about 10 minutes, then it started flickering. So I took the buffer board out to check it out and when I put it back in the whole screen was messed up. Now if I unhook the buffer board and turn it on it makes no difference. But if I unhook the Y or Z Sus boards it make the screen black. Any help guys please. How can I find out what the problem is? Also what do you recommend for the other tv? The noise or flashing pixels are only acrross the bottom and top left mostly. What would cause this?Last edited by burner6999; 07-07-2012, 06:08 PM.Comment
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Re: Help with Plasma tv.
The second set has the dreaded sparklies problem all too common with LG plasmas. It is fixable, but it requires the firmware of the logic board to be flashed with a newer version. Unsure of the first one, maybe post a picture so we can see it better, hard to imagine a description.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Help with Plasma tv.
Is there anyway I can flash the firmware using the USB service port on the back and the service menu?Comment
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Re: Help with Plasma tv.
As far as the sparkle problem. you can remove one buffer at a time and, see if the symptoms change. if they do obviously, you will need one or both buffers. you can also test the buffers by testing across the gold pads for shorts and, you can also check the individual ics on the buffers for shorts to ground
These sets also have problems with the YSUS IPM Module. Remove the YSUS and XSUS boards and looking at the bottom you will see the bottom of the IPM Module (the big IC with 30 or so pins, under the aluminum heat sink) check between ground and ysus out, etc. if any of these are shorted then you need a YSUS or XSUS depending on which reads shorted.
Check these and let me know
Electronic Surplus
Yes, you can flash the firmware. go to the manufacturer site and search downloads. ONLY some models have firmware updates available and, some manufacturers do not post them
Electronic SurplusThis Forum absolutely the best and, the most helpful forum I have ever found anywhere. thanks to all the fantastic members here
Help keep these from the landfillsComment
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Re: Help with Plasma tv.
Thanks man. I may not be able to post results until tomorrow.Comment
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Re: Help with Plasma tv.
Unfortunately you -CAN'T- flash the firmware from the USB or SD card slot. You can flash the main processor firmware but not the control board. There's a user on these forums flashing control boards for a small fee.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Help with Plasma tv.
Thanks to all the people that helped me out. I found out that the tv with the flickering was due to the Ysus and Zsus. The one with the sparkles was a problem with the screen itself. So I took the ysus and zsus from it and put it in the other and now I have one perfect working 50" for $100.Comment
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Re: Help with Plasma tv.
I have the same tv. If the tv is powered up, the y sus heat shield warms up and the z sus stays cool. As for the y sus, the heat shield on the far left gets warm, the others are cool. My symptoms is not picture but little fuze, heavier on the bottom and top R/H side of the screen.Comment
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Re: Help with Plasma tv.
The more tricky way to do the firmware is to remove the flash i.c. off the CTRL and apply the firmware manually. This takes quite a bit of skill in removal, you could buy a blank i.c and flash that then fit that in place to see what happens. I use a cheapo "willem" type programmer with a TSOP48 adaptor. I've modified it somewhat to allow flashing of some other ic's. For an occasional job it's more cost effective than forking out on the LG kit, and can be used for all kinds of jobs.Comment
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Hi all,
I'm interested in understanding how a buffer board chip is working. I know there's about 90 outputs per chip to the plasma panel, but I'm more interested to know about the input pins. I guess that some of them are address pins, but I want to know more.
So far I've found nothing at all. I haven't found any datasheet about the various buffer chips, and I haven't found any schematic for the buffer board using them (Y Buffer Board in Samsung's terminology).
Any information will make me happy. It can be from any buffer chip or plasma TV manufacturer.... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Hello,
The monitor started off showing flickering thin (1 pixel) lines horizontally every say 3mm..
They are black on the right and gradually fade to nothing on the far left.
They start either after 5 mins or up to 2 hours after so annoying for testing.
They flicker continuously very fast! With a slight pause milli-second every second.
Initially I cleaned the LVDS cable and connected to the T-Con and then it worked fine for 3 weeks but not sure if this was just co-incidence.
I tested each half by removing the first the left flex from... -
Background:
I have a LG 50PA550 Plasma TV which stopped displaying a picture. The sound works just fine. The outputs of the power supply board were within 2% of the expected values. After removing the Y top buffer the bottom half of the TV started working.
Question:
Do I have to order both a Y-Buffer and Y-Sustain board to fix this?
Could I somehow check the Y-Sustain board to see if there was any damage done to it? -
Hello everybody! It's been nine years and I'm back again with the same monitor that several people here helped me fix back then. The first time, I replaced two caps as was recommended here and the original problem was solved. Then it started acting up a few years later and I came back for a parts list and replaced a few more caps (I didn't make a post about that and don't remember which ones), and again the problem was solved. This time, however, I'm not sure if it's caps.
The monitor stays on but certain colors will flicker. Generally it's darker colors like dark greys or dark blues,...
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