samsung 51d490 sound but no picture issue - AVS Forum
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post #1 of 16 Old 09-16-2013, 07:09 PM - Thread Starter
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Hi guys, wandering if someone can help me fix my Samsung 51d490 plasma set. It was working fine then one day I turned it on and get no picture. The sound works fine but no display at all. Any idea of what the issue can be? I've seen replacement boards pretty cheap on eBay but I'm not sure what I would need. Thanks
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post #2 of 16 Old 09-17-2013, 04:54 PM
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This model is very prone at blowing the X-main board.

To test you will need a digital voltmeter unless you just want to swap boards.

When replacing the X-main it is very much advisable to replace the Y-main simultaneously (i.e. before power reapplied), due to the risk of a damaged X-main killing the Y-main. Which would lead to an infinite loop of replacing single boards.

To see if a fault with X- or Y-main has occurred, look at the control board. Centre green board below power supply. If functioning normally, LED will blink approx once a second. If there's a fault, it'll blink approx one every 5 seconds.

Make sure to match the REV number on your PCB for the replacement.

Also apply the firmware update on Samsung.com for your model to prevent repeat failure. These models typically kill the X-main within 6 to 18 months due to a software fault on the control board. The firmware update fixes this fault improving the X-main reliability.
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post #3 of 16 Old 09-17-2013, 05:47 PM - Thread Starter
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Thank you so much for the reply. Sounds easy enough. Thanks again
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post #4 of 16 Old 10-17-2013, 11:48 AM - Thread Starter
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Thanks for the fast reply Tom. Well I had the TV in the shop, forgot I had an extended warranty threw visa. The shop said the issue is with the y main board got quoted 375.04 to fix.So visa is going to cut me a check for the cost of repair and I figure I'll just fix it myself. Going to replace both x and y main boards. Question should I replace the buffer boards also?? Thanks
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post #5 of 16 Old 10-17-2013, 02:02 PM
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I wouldn't worry about replacing the buffers on these models. Never found a bad buffer to be an issue, they're pretty reliable. It will cost about $60 to repair if you buy the parts individually, I have no idea how a service centre can charge nearly $400 when a new 50" 720p plasma would only be a little more!
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post #6 of 16 Old 10-17-2013, 02:57 PM - Thread Starter
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That's why I'm having visa cut me a check. Used parts from ebay are going to cost me about $40 total. Thanks for the input, I appreciate it..
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post #7 of 16 Old 10-17-2013, 05:02 PM
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Quote:
Originally Posted by gymguy View Post

That's why I'm having visa cut me a check. Used parts from ebay are going to cost me about $40 total. Thanks for the input, I appreciate it..

IMO I would buy the parts from ShopJimmy or another good supplier if you're not budget constrained, as they test all of their parts. Other suppliers on eBay usually do not and the percentage of bad boards from eBay is around 10 to 20%, enough to be irritating in the least!

One thing to make sure when you swap the boards is to match both the REV number and the LJ44 number on the board.
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post #8 of 16 Old 10-17-2013, 05:12 PM - Thread Starter
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Again thanks for the fast reply, I'll definitely check out shopjimmy and make sure to match the numbers. In your opinion should I still change both boards (x and y) even tho the repair shop said it was the y board? Also is it as straight forward as it looks just unscrew the back panel and the main boards then unplug the ribbon cables? I've never opened a flat screen before.
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post #9 of 16 Old 10-17-2013, 05:32 PM
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I would swap both as a precaution. Bad Y-main can possibly kill X-main and vice versa.

To repair: Just unscrew boards, unclip connectors, remove boards, install new boards, clip connectors, screw in boards, power up set (This may be done without the cover installed as long as you do not touch any internal part of the set in operation. A loud buzzing sound from the panel may be evident on bright scenes until back cover fully installed, this does not indicate a fault.)

After you see it works, go to the Samsung.com website and download all firmware updates for your TV to prevent repeat failure. This is a known issue with 2011 Samsung plasmas.
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post #10 of 16 Old 10-17-2013, 07:34 PM - Thread Starter
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Thanks Tom, I'm going to start working on it this weekend. I appreciate all the info you shared, thanks again
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post #11 of 16 Old 10-19-2013, 11:04 AM - Thread Starter
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Looking at shopjimmy and they don't show rev numbers. How important is this. I have the PCB numbers Y = lj41-09423a, rev # r1.4
X = lj41-09422a, rev # r1.2
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post #12 of 16 Old 10-19-2013, 11:22 AM
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For the 51" there should be no problem with newer rev. Only 43" there is a potential concern.
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post #13 of 16 Old 10-19-2013, 11:44 AM - Thread Starter
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Thanks again Tom, I just wanted to make sure the rev numbers didnt matter. BTW looks really easy can't believe they wanted to charge so much at the repair shop for unhooking a few cables and screws.
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post #14 of 16 Old 10-19-2013, 12:36 PM
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The first screw costs you $350 (for the experience), every screw thereafter $0.50.
They charge high prices because so few people get their TV repaired because of the high prices.
(There's a bit of a chicken-and-egg problem here...)
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post #15 of 16 Old 10-25-2013, 06:19 PM - Thread Starter
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Thanks again Tom, parts installed and works perfectly. Looked on Samsung's website and no fw updates for the american 51d490 hope its not an ongoing issue. In any case thanks again
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post #16 of 16 Old 10-26-2013, 05:16 AM
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Enjoy your TV!
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