Re: Electrohome 42E900 TV - Bad picture (was No video)
I've added the full image of the Y-Main removed from the TV:
The swollen electrolytic capacitor is the one in the upper right of the photo, nearest the big blue component.
One new experience now that I got a second new main logic board. (The last one caused a safety shutdown, as mentioned prior.) This one allows the TV to power on and stay on, but it actually won't shut off and doesn't seem to be responding to commands. The green light on it that would normally be flashing slowly...
Deviant69
New Member
Last Activity: 03-27-2020, 09:26 AM
Joined: 03-24-2016
Location: Toronto, Ontario
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Re: Electrohome 42E900 TV - No video
Here is the image I have that was part of the gallery link I posted:
[URL="http://i1262.photobucket.com/albums/ii607/SpawnedFromTheEther/Electrohome%2042E900%20Plasma%20TV/Y-Main.jpg"]Samsung LJ92-01200A Y-Main (Y-sustain)[/URL] (direct link)
(Upper Y-buffer board was removed at time of photo.)
I've pulled the board out of the TV just now in preparation for replacing the one swollen capacitor (the only obvious visible fault I could find in the entire TV). There actually seems to be...Leave a comment:
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Re: Electrohome 42E900 TV - No video
In today's news, I managed to get a full refund from eBay for the Y-buffer boards. (They didn't even require me to send them back!) I saw a YouTube video today of a guy showing a simple way of testing for shorted buffer lines. It's a basic continuity check with a multimeter between the output pins for the screen ribbon cables and the high-voltage input to the Y-buffer boards. Every pin on my original boards and on the lower board from eBay showed a consistent resistance. Compare this with the pins around the fried chip on the bad upper board...Leave a comment:
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Re: Electrohome 42E900 TV - No video
Well, I now know what a bad buffer IC looks like. I purchased a pair of Y-buffer boards from eBay which the seller said were "removed from a working environment". Contrary to that statement, one of the boards was horribly burned all around and under one of the individual buffer chips that had catastrophically failed. (While one of my original Y-buffer boards seems to be defective, it doesn't have any evidence of burning.)
Further to my bad luck I also purchased a supposedly working Main Logic board from another seller...Leave a comment:
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Re: Electrohome 42E900 TV - No video
One other question - What is the push-button on the main logic board used for? (It is near the left side. You can see it in the photo I posted of that board.) I'm not sure if I should try pressing it. The service manual only mentions the test-mode jumper, but nothing about the button.
Also, too late to edit my last post, but the capacitor noted above, 50V 100μF, should be 10x18mm size. Somehow I wrote down the wrong one.Last edited by Deviant69; 03-25-2016, 08:14 PM.Leave a comment:
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Re: Electrohome 42E900 TV - No video
(OSD of volume control with only lower Y-buffer connected.)
I've taken photos of all the major components and put them online in the following gallery:
[URL="http://s1262.photobucket.com/user/SpawnedFromTheEther/library/Electrohome%2042E900%20Plasma%20TV"]http://s1262.photobucket.com/user/SpawnedFromTheEther/library/Electrohome%2042E900%20Plasma%20TV[/URL]
Photos of the screen sparklies and vertical bars have been included, and there are part numbers, descriptions and notes on every photo....Leave a comment:
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Re: Electrohome 42E900 TV - No video
After some additional investigation this evening, volume control is now working for no apparent reason. Perhaps it was something in the numerous cable connectors on the Scaler board because I had since detached and re-attached all of them while looking for the board part number.
I did the Y-Buffer disconnect test. The upper Y-Buffer appears to be bad because when the lower buffer runs alone there actually is something displayed on the bottom half of the screen - not anything much recognizable though. Black areas show scattered...Leave a comment:
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Electrohome 42E900 TV - No video
I just posted this over at the AVS Forum also, but perhaps you guys will have more information:
I just came into possession of a plasma TV that is not fully working and I'm trying to determine if it's worth the cost to fix it. (It was free, which is the only reason I'm considering it.) This model uses mostly Samsung components. The condition is as follows:
- No video, but the panel is clearly getting a slight hue when powered on.
- Sound is working, but volume control is not.
- Front panel buttons don't appear to be responding, except for the power button.... -
Re: New Members - please post your introductions here
Greetings!
I've found a lot of great information here by lurking before, but the time has now come for me to join the conversation. I just got hold of a plasma display that needs some TLC, so I'll have some questions for you shortly!
See ya around!Leave a comment:
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