T-Con Board RUNTK5261 Test - How to Find Faulty Component Showing Bad TV Panel

How to Find a Faulty Component on this t-con board

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E600i-B3
E601i-A3
E601i-A3E
E700i-B3
E701i-A3
E701i-A3E
KDL-60EX645
KDL-60EX645
KDL-60R520A
KDL-70R520A
LC-60LE452U

The following TV model numbers have a high rate of failure with the TV panel. There are some symptoms that a TV can show that can lead people to believe the problem could be with the t-con board. If your panel is bad, and you replace the t-con board, your TV panel will damage the t-con board.
In this video we will show how to test a component on your existing t-con board to help determine if there is a problem with the TV panel.
Here is where the component is located on the t-con board.
As we take a closer look, we will identify a few of the test points.
Here we have the drain.
Here we have the gate.
And here we have the source.
There are a few different ways to test the component with our multimeter. We can check the DC voltage, check the continuity, and run a diode check.
Here are the DC voltage measurements that we should see on a working t-con board with video. I will start by powering on the TV and put my negative lead onto a ground area. Then I will test the drain by putting the positive lead of my multimeter to the drain pin. This should read about fifteen and a half volts (15.5).
Next, I will test the source pin, which should be zero.
Then I will test the gate which should be at three and a half volts, (3.5).
If you test all of these points on this component and they all show as zero or next to zero, then the board is bad and has most likely been damaged by the TV panel.
We have found that about 75% of these bad boards have been damaged by the panel.
To run the diode test, be sure your TV is unplugged, switch your multimeter to the diode setting and then place your negative lead onto the drain and then positive lead onto the source. If you get a zero or next to zero reading, then the component is damaged and the board is bad, thus meaning that the panel is most likely the cause of the problem.
We will now show the same test on a board that is good. The meter shows a reading of .42, if we removed this good board from the TV and tested it, it would show closer to .52.
These readings show that the board is good.
We will now test the board in continuity mode on the multimeter. I will switch my multimeter to the correct setting, and then put my probes on the drain and source. My meter is showing6, and sometimes it might show 4 or 5, but basically, if there is any number displayed, that means the board is bad.
When we run the same test on a good board, the meter says OL, which means the board is good.
It is possible that if you have a bad T-con board, that replacing the board will fix the problem. However, if this specific component that we just showed how to test, shows as bad, then there is about a 75% chance that your TV panel is bad. This component always goes bad when the panel goes bad.

TV Repair Made Easy™

[kl]

Is this lesson specifically for this model? Or can it be universally applied? I'm looking at my T-Con board and I see 5 components. We can just test any one of them?

[TampaTec]

great video, really helpful, thanks greg!

[Reseiver]

This will be my weekend project. Thank you for the detailed video.

[pervaizalam]

HI, I have Vizio E70-E3 model, first few of the LED strips went bad and I had picture and sound with dark areas on the screen when watching the TV. I replaced all the LED strips but now I am not getting any picture nor the sound. I need some help to determine whether it's a T-Con or main driver board and I have no idea how to do that.

[richiej]

Hi.. Ive just been given a 50inch jvc fire tv with lines horizontal and vertical, with the picture coming back and then flickering to lines and so on.

Ive disconnected one ribbon and one half of the screen doesn't flicker, then when I plug the other side in the flickering returns.

Ive swapped the ribbons across to rule out the ribbon and I get the same flickering result.

My question is regarding the said failed chips that you tested, do they fail without a deeper seated issue? Like poorly made for example? Assuming these parts cost peanuts to produce in China...

Im tempted to just throw another Tcon in and take a chance.

Cheers

[walkerable]

Hi Shop Jimmy thanks for this help however the Tcon board on the JVC model I am restoring does not have

[JonathanCintronTV]

Hi, let’s see if you can help me. My TCL Roku TV started showing a black cloud on one side of the tv then it started showing color lines. I changed the tcon board for a new one. The lines stoped showing but now I only see a white screen. No image.

[ccc]

Would replacing the part fix the board or would it require more than replacing the bad part?

[taomibaobao]

Sony, 50w700b, no picture, got sound, got back light, remote control can change channel, possible tcon board issue?

[joeripelgrims]

So if the T-con board is bad, there's no use in replacing it? Seeing as apparently in 75% of cases, the panel caused it and will cause it again.

[thepiecesfit]

If the diode test (drain and source) measures .43, but the drain measurement while the tv powers on very low does that still mean the panel is bad? Dealing with an OLED where its power drops before it turns on. I’ve replaced the t-con, mainboard and power supply and nothing seems to help.

[ldonaldson]

excellent video thanks I wish I could have seen this video before I replaced my T-CON board in my Sony KDL- 52v LCD TV it would have saved me a lot of time and money I will reference to this video the next time I work on this particular brand of Sony TV thanks P.S. do you sell a replacement EEPROM for a (Auria EQ 2288f LCD TV) mainboard location=U16

[clintonbeasy]

Shop jimmy I unplug right side of tcon board and no image on left side what does that mean are my did gate the issue?

[bigmaw]

Are you guys every going to get the Vizio E470i-A0 Main Board & 12 Strip LED's and Board back in stock? I've set the in stock alert, but you guy's have been out of stock for three months. Just curious when they might be back in. But anyway, love your videos very helpful keep up the good work. Thanks!

[gassprint]

Curious to why you don't have an lcd screen panel tester.

[dougjacobson]

Samson 60 in smart tv power up blk screen, 15 20 sec half screen slowly comes on very grainy then 2nd side all vertical lines slowly gets better 1st side gets dark after 2 3 mins turn off power turn back on then excellent seems like 1 or both sides have to warm up. but wont get good until power off then on.

[MrJammor]

Is that MOSFET component he is testing? Or is it a diode?

[marksreef]

Lots of great questions. Too bad they have no answers.

[fathergratwick]

I have repaired about a dozen sharp paneled vizios with this bad panel issue by cutting the buffering chips off of the bad side of the panel with a razor knife after replacing the tcon. one of these sets gets used a lot in my bar and has been working fine for over 2 years since this repair. one out of the dozen has come back as failed afterwards.

[thijstlam]

Hi, i have a problem with a Philips 42PFL7685H/12: after putting on the TV you can see the Philips logo and after about 10 minutes the TV works fine with no problems. When its hot in the area the time is a lot shorter. I have already replaced the T-con board (6807-0309c) after that, the TV give only black and grey vertical stripes, for ever..