Re: Last chance Bravia. blank or white screen KDL-60EX645
Plz don’t tempt me, lol. It’s such a shame to toss it. I have the buffer boards and tabs from the other TV and I’ve been wondering if and how I could swap them. Yet I can’t see how there could be a short. Ugh I’m gonna have to smash it so I can let go. I have repair OCD, to the point I fix things just for the sake of fixing them. Well beyond practical.
PlayDoh
Member
Last Activity: 01-31-2018, 10:29 PM
Joined: 09-22-2017
Location: Calgary Alberta
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Re: Last chance Bravia. blank or white screen KDL-60EX645
[URL="https://youtu.be/yTnkOfwBGGE"]https://youtu.be/yTnkOfwBGGE[/URL]
Panel is shot, to the pit it goes.Re: Last chance Bravia. blank or white screen KDL-60EX645
[URL="https://youtu.be/yTnkOfwBGGE"]https://youtu.be/yTnkOfwBGGE[/URL]
Panel is shot, to the pit it goes.Re: Last chance Bravia. blank or white screen KDL-60EX645
[URL="https://youtu.be/yTnkOfwBGGE"]https://youtu.be/yTnkOfwBGGE[/URL]
Panel is shot, to the pitLeave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
Most of the outputs from the main/logic board to the T-Con are from 1.2 to 1.4v. I would expect around 6v each, and very consistent. This is with the T-con cables disconnected. there are 4 or so 12v pins, and power board is giving 12v to T-Con VCC, and 3.2 to T-con on.
And this is the same with 2 identical Logic boards.
Is it possible that a panel short could damage the logic board and cause it to underpower the T-con? Even when the T-con is disconnected?Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
On YD I get 12v on both sides, that tells me it’s not open/blown. Is that incorrect? 1R0 is 0.25v on both sides. YD and 1R0 both reading 0.4 ohms.
I did diode tests on that transistor awhile ago, and just now. I was following a YouTube video on testing the T-con. I think the single post is called gate. With the side with the single post up and using diode function I get 1480 or 280 between top and bottom left. Switching polarity of probes gives different readings.
From bottom left to right is 300...Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
The arrows on the right are just the fuses I checked. I've noted they have letters, and the ones on the left are numbers only. Resistor?...Last edited by PlayDoh; 01-28-2018, 09:14 PM.Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
I used a continuity tester, yet I'm thinking there not fuses. The 2 arrows on the far left, 103 & 242, have resistance of 2300 ohm and 6300 ohm. Which would explain why my 1 AA battery and bulb continuity tester wont show continuity....Last edited by PlayDoh; 01-28-2018, 09:12 PM.Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
Both main boards are on the frame, but one is just sitting there after being switched out. That’s the most confusing part about this, is since I can just swap out every board or cable it should effectively eliminate the part as the culprit.
Essentially the only thing I can’t swap is the panel.Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
Here's some pics. I have the driver tab/boards removed off the second tv, yet I can identify any fuses. There are 2 fuses on the right bottom of the T-con that have less than 1v on one side and 0 on the other. Also no continuity across them....Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
I'll give the panel boards a check. The driver tabs was my first suspect, as when I was flipping the TV over durring reassembly one of the tab ribbons got twisted up on the frame. Didn't look too damaging, but it was the only thing that I did witness.
I swapped the connecting ribbons from the second set, and aside from attempting to swap the tabs, if thats even possible, I'm out of ideas.
Thanks a lot for the help though. I'll check the driver boards now....Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
Thing is with 2 T-cons one could have burst in to flames, and I don't see how the second one, that worked fine last used, could give me the same black screen I started with.Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
I had the sheild off before plugging the TV on and testing. I was pretty carefull with the multimeter, and cant see how I would have shorted anything.
F101 bottom right. I cant even see a slip of the probe being able to touch 2 pads and short something. Yet I wonder if just using the meter could have caused the short?Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
inductor coils all have voltage, 12.3v 3.3v and 1.3v
Fuse resistance is 0.5 ohm
Not the slightest effect from wiggling LVDS cables, or tabs, or any cables at all. The only thing that made anything happen was when I took the sheild off the T-con and checked voltage. There was a clicking that came from the Power board, and the white screen flickering along with the clicking. After that just white screen. After I swapped T-con boards, its back to black with backlights on.Leave a comment:
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Re: Last chance Bravia. blank or white screen KDL-60EX645
I have 2 T-cons though, and both were working before. Highly unlikely both would fail while being stored in a box, no?Leave a comment:
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Last chance Bravia. blank or white screen KDL-60EX645
So I'm at my wits end with this TV. I had 2 of these sets bought at the same time. Both went dark with Backlight 6 blink error. Ordered strips, installed strips, worked for 2 weeks, then same error.
Ordered power board since it has brown area by backlight connector, and has to be the cause of the issue. Instal board, backlights (edgelit) works again, but now no picture. Sound and backlights, but no picture. I can tell by the edgelights its booting up.
So I start checking the cables and such on the Tcon, and after checking the fuse, the screen starts up and goes all white. At first... -
Re: LED edgelit strips thermal adhesive importance
I agree that an LED failure causes the others to be overdriven and Receive more current. Yet I don't follow your math to be honest. If a bank of 17 receive 107v and one fails, then 16 receive the 107v. The resistance of the LED strip being now altered, could effect the supply components, to the point of damage. Yet my guess is the other way around. It's the supply that initiates the failure.
My unique situation is having 2 TVs bought at the same time and used in the same house. For 5.5 years they...Leave a comment:
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Re: LED edgelit strips thermal adhesive importance
I agree with the notion that it's current that kills LEDs most often, and that tape is more practical. In fact that's what I used. Yet I don't see how epoxy would do anything to the position of the strips. CPU's can use compound, epoxy or tape. Compound and epoxy being the thinnest and most convective. The thermal transfer ratings are way higher than tape.
Yet if thermal issues were that important, the LEDs would have been dead years ago. They seen in the ballpark of 20,000 hours....Leave a comment:
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Re: LED edgelit strips thermal adhesive importance
[URL="http://www.arcticsilver.com/msds.htm"]http://www.arcticsilver.com/msds.htm[/URL]
Have a look for yourself. I'm not sure why you would say it's not suitable. It's the Cadillac of thermal adhesives. Maybe it's overkill, but according to LED experts it's the best choice.
[URL="https://www.ledsupply.com/blog/#article/1473"]https://www.ledsupply.com/blog/#article/1473[/URL]Re: LED edgelit strips thermal adhesive importance
[URL="http://www.arcticsilver.com/msds.htm"]http://www.arcticsilver.com/msds.htm[/URL]...Leave a comment:
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Re: LED edgelit strips thermal adhesive importance
Just the Epoxy was dumped...Leave a comment:
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Re: LED edgelit strips thermal adhesive importance
any recommendations as to what to use as an adhesive? I'm guessing I can't go wrong with the Arctic silver, but its not easy to find. I can get it, but since its not manufactured anymore, I'm wondering if theres an alternative?Leave a comment:
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LED edgelit strips thermal adhesive importance
So I've been working on a 60” Sony and found a couple dead LEDs in one of the edge light strips. Ordered new strips, reassembled and tv works great for about 2 weeks, then burns out another LED.
I had 2 of the exact TVs both go out within a month of each other so a random LED in 2 strips of 68, go out in 2 TVs at the same time after 5 years seemed unlikely. I noticed on both the power supply boards, the area of the LED connection was getting hot. You can see it's baked the board slightly.
So I just got a new power board and about to reassemble, yet I have concerns about the adhesive...
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