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@oldturkey03 could you please help me with the same problem. I would like to fix it but could not find the backlite cable
Here are the photos
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Hi @cece08
It may not be the backlights themselves that are the problem
Here's the service manual for the TV.
Go to p.40 and view the 6 times blinking (Backlight Error) troubleshooting flowchart and see how far you get when following the checks.
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Hello @jayeff thank you so much for the manual as I didnt have that anymore. It is way complicated that I thought. I am pretty handy but no experience with electronics. I need a tester to check the cables
@jayeff @oldturkey03 Hello. So I took the back off and (from a ytube video) I found the backlight cable and remove that and grounded. Now I have sound, no backlight error as I disable that but I dont have any image. Sony image comes and goes at the first. Need your help
You won't have any images as there's no backlights.
Try shining a torch at an angle close to the screen and check for images when you have sound. They will be very faint if you see any.
Also I don't know how you saw the Sony image without any backlights as you said you disconnected the cable.
Which cable exactly did you disconnect, LD board or B board?
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From this board- I took off the 4th cable out and grounded. By shining, I can see the welcome sign and set up very faint. @jayeff
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It's either the power board (the board you took the cable out from) or the backlights.
Easiest way to test the backlights is to get a "backlight tester" (search online for backlight tester to find suppliers) and then connect it between the LED +ve and LED -ve wires for each strip in the LED cable plug (not the board connector socket).
It is the tester that supplies the power to turn on the LEDs not the power board, so you don't need power on the TV.
If the LEDs don't turn on you know that they're the problem. If they all do then it's the power board.
There won't be images on the screen because the TV is turned off, but the screen will "lighten up" if all the backlights do turn on i.e. TV screen goes from black to a lighter black or dark grey colour.
@jayeff ordered the backlight tester, once I get it, I will update you shortly. Thank you
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a video while I was plugging unplugging the black LED- @jayeff
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Hi @cece08,
Which cable did you unplug?
Looking at the image a few days ago I though that you meant the cable from the power board (cable under the red arrow on the brown board shown in image) which appears to go into the back of the screen but maybe not as it is hard to see, as you said unplugging this stopped the error blink
Whereas the cable in the image above is from a green board (mainboard?)
What is printed on the brown board next to the connector under the red arrow? Des it say LED at all?
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@jayeff i think i found the LED - and +
i got some led lights when I did that and it shows 140 on the tester
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Hi @cece08,
Did you try all 4 pairs of LED wires.
usually there are more than one horizontal strip of LEDs. It could be 8 strips i.e. 2 strips connected to a pair of +ve and -ve wires
So you need to make sure that all rows are working with every LED showing i.e. no gaps in the row indicating a bad LED. If there are gaps you have to replace the strip. If you replace a strip you may as well do all of them because if some LEDs have already failed the rest can't be far behind and also there may be a difference in the brightness between the original LEDs (now aging) and the newer replacement ones
Hi @jayeff
I came back to check them one by one- left to right all of the three light up-tester showed 140 and only last one did not light up and stayed at 300.
That set of strips has a problem which is stopping the TV from turning on as there is an open circuit somewhere in the strip(s) (failed LED perhaps) There seems to be 4 strips per power feed as there are 16 strips in your TV.
If your model is a KDL-65W850C then search online for "(insert TV model number) backlights" to find suppliers of the strips.
Here's a video that shows what to do. This is the only one I could find that shows your model series there may be better other ones idk.
Please accept my original answer or mark my original answer a helpful, to let other know who read this thread, that the information in it helped to fix your TV. Thank you.
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@ceylanerkut make and model of your TV? What have you tried?
oldturkey03 さんによる
Hello. It is Sony KDL-75W850C.
I tried resetting, troubleshooting-followed Sony’s instructions. It didnt help. Nothing worked. I watched couple videos with similar problems, unscrewed all the screws looked for the backlight cable but i couldn’t decide/find which is which.
Ceylin さんによる
@oldturkey03
Ceylin さんによる
@cece08 my colleague @jayeff got you covered. Et the least expensive multimeter and all you need to do is to check the basics, You can do it! If in doubt, just post images of the boards etc. with your question. We can always point out where and what to test. As long as you know how to use some basic hand tools, it's not as complicated as it may read. :-) iFixitでの質問に画像を追加する方法
oldturkey03 さんによる
Here are the photos[image|3220045][image|3220044][video|5663]
Ceylin さんによる
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