Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Flocko, I think the problem was that I had to cut quite a bit off the LED strips because they're so close together on this TV. When I soldered wires back on, I obviously wasn't making a decent connection with the solder. I also wasn't checking the connection through the remaining LEDs and my repairs, if that makes sense.
Hopefully I'll be able to upload a pic here to show you. I also covered the solder joints in wire glue, just to be sure....
Ianhw77k
Member
Last Activity: 11-23-2016, 01:53 AM
Joined: 11-04-2016
Location: Sussex
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Sorted (I think). My dodgy soldering again!
Managed to rig up the LEDs to test on the bench and carried on testing after each stage of putting it back together.
Just about to take it upstairs and plug everything back in to it.
Thanks everyone for your great help, you've saved me a lot of money as well as furthering my education.Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Turns out that LED was fine, my soldering must have been at fault. I soldered it back in, put it back together and still getting the same problem. Just in the process of stripping it again to test the LEDs.Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
OK, I've stripped it again and one of the replacement LEDs is out. It was fine when I got it as I tested them all. I'll try removing it and testing it again, see if my connections have gone wrong.
Looks like the kids won't be getting their film night tonight.Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Absolutely, checked, double checked and checked again.
Will the backlight flash if there's any connected wrong or any more that have blown? I never got a flash off it before, which leads me to think I'm heading in the right direction.Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
I fitted the LEDs, tested them and their connections and all seemed fine. I've partially put the TV back together, plugged it in and it still doesn't work.
One thing is different, when it first turns on, the backlight comes on for a split second but doesn't stay on. The LCD display is still working with the flashlight test.
Any ideas where I go from here?Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Just ordered them, thanks for the quick reply.
I also ordered some of that silicone heat glue stuff, I've got some old bathroom sealant lying around in the workshop but thought I'd better do this semi properly.
Fingers crossed I can get this all back together without breaking anything and it'll work. I'll let you all know either way. Thanks for the help.
Ian.Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Great, I'll see if I have the message function yet and get on with that.
Thanks a lot....Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Hoping the images are here.[ATTACH]144349[/ATTACH]
[ATTACH]144350[/ATTACH]Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Hoping the images are here.[ATTACH]144349[/ATTACH]
[ATTACH]144350[/ATTACH]...Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Yes, I've watched that video twice now, so I'm on the right track.
I've removed 3 LEDs, I just need to find suitable replacements but I'm finding the numbers a bit confusing. If I can figure out how to upload pics from mobile, I'll put some up.(I'll read through the relevant stickys now)Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
I've found a couple of suspect LEDs on two of the strips. I will hopefully try the bridging method of repairing them (if I can find suitable replacements on ebay) and I guess we'll see where I go from there.Leave a comment:
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Re: Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
Upon closer inspection I've just counted 45 LEDs so maybe 116.6v isn't right?Leave a comment:
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Toshiba LCD TV model 40L3455DB backlight issue. (Vestel 17IPS20 power board)
This TV was fine until the other day, we went to turn it on and nothing happened. I eventually found out we had sound but no picture, then did the flashlight test and diagnosed a backlight issue.
I've tested the main power board voltages to the LEDs, the black wire is giving 11.3v and the red wire is giving 116.6v after first starting at around 190v and settling down to the 116.6v.
Is it time for me to start dismantling the set further and test individual LEDs or should I be doing further testing?
Go easy on the terminology please, I'm a mechanical engineer... -
Re: New Members - please post your introductions here
Hello, I'm Ian and I'm from the south east of the UK.
I'm a complete novice when it comes to electronics, I'm far more at home with mechanical devices. I just like to be able to fix my own stuff and my TV is broke. I've managed to get to a certain point but now I need some help. After a whole day searching the Internet, I decided that this looks like the best place to be.Leave a comment:
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