Last chance Bravia. blank or white screen KDL-60EX645

[PlayDoh]

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.

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

It's always worth buying a another tcon just for shit's and gigs and connect one side at a time the 1st side use your judgment

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

Before you do that you could at least rip off the side tab gate drivers and see if it straightens it out one side at a time.

[PlayDoh]

Re: Last chance Bravia. blank or white screen KDL-60EX645

https://youtu.be/yTnkOfwBGGE

Panel is shot, to the pit it goes.

[PlayDoh]

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?

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

Im about to snap on my XBR75X850C.. I have dreams of taking a mallot to the screen.... No TCON voltage , but has 12v coming in, been through 5. Everything points to TCON though... Even with panel disconnected...

On yours on some of those inductor coils, you shopuld be reading voltages around 28v or so. If not, tcon cant fire up the panel correctly if HVDD missing.

[PlayDoh]

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 either way.
Bottom right to top is 1060 or 360.
Since I can swap out every part but the panel, I can’t see how it’s anything but the panel at this time. I had to take the panel out twice, and while I was very careful, there not made to be removed obviously.
I can’t give up on it until I can confirm it’s the panel, or just snap and throw it through a wall. Not sure which is more likely.

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

OK so YD is the fuse. That's open. 1r0 is a 1 ohm .also open. You got tcon problems man. And I would be expecting a problem with the panel replace that fuse in that resistor power of the tcon with no panel connected. Check for voltages around coils you should have higher voltages some around 28v in some areas for HVDD

103 is a 10kohm. 242 is 2.4kohm.

If I'm understanding you YD is open right?

[PlayDoh]

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?

[PlayDoh]

Re: Last chance Bravia. blank or white screen KDL-60EX645

not sure I understand your "Also no continuity across them" statement... but if it is correct (meaning your technique for determining this), then that means those fuses are blown.

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.

[budwich]

Re: Last chance Bravia. blank or white screen KDL-60EX645

not sure I understand your "Also no continuity across them" statement... but if it is correct (meaning your technique for determining this), then that means those fuses are blown.

[PlayDoh]

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.

[PlayDoh]

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.

[PlayDoh]

Re: Last chance Bravia. blank or white screen KDL-60EX645

From the sounds of it you are missing VGH voltage. This will cause the white screen effect. There might be a slight possibility that there are some pico fuses located on the panels source driver boards. You might be able to get in there in check all capacitors and resistors on the panel boards for shorts or opens especially around VGH

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.

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

Unless the panel shorts and takes the tcon out before y ou know it.

Read up on the E701-A3 tcons. Same beast same problems.

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

Check this transistor for shorts in diode check mode.

[PlayDoh]

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.

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

From the sounds of it you are missing VGH voltage. This will cause the white screen effect. There might be a slight possibility that there are some pico fuses located on the panels source driver boards. You might be able to get in there in check all capacitors and resistors on the panel boards for shorts or opens especially around VGH

[PlayDoh]

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?

[freakaftr8]

Re: Last chance Bravia. blank or white screen KDL-60EX645

Also I should mention the clicking sound and now the white screen probably tells me that you're tcon took a shit. Do you have the part number of the T con?