Anyway, the tv is working great now! Thanks for the help guys! This one had us fooled.....
x_orange90_x
Badcaps Veteran
Last Activity: 07-30-2026, 04:36 AM
Joined: 05-22-2015
Location: Macomb, MI
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I finally got around to replacing the backlights. There was ONE bad LED in the whole set.. Not sure how there's 3 positive wires yet they're all still wired in 1 series.
Anyway, the tv is working great now! Thanks for the help guys! This one had us fooled..... -
I ordered backlights this morning. They should be here Saturday and I will probably put them in that night. I'll report back my findings.Leave a comment:
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🤣 I see it even says Hisense in the box in the lower right of your screenshot. Shop Jimmy lists this as a Toshiba board and so I just went with that
Hmm, then I still find it hard to believe that it took 1 failed LEDs on 3 different strings to trip the protection. Guess I will find out when I pull the panel off and test them strip by strip...Leave a comment:
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You're right about that, I don't doubt they would keep watching it. A local dentist office I was just on recently has a Vizio on the wall in the waiting room with a quarter of the screen dark.
Despite being manufactured by Hisense, this tv has a Toshiba power supply. A Hisense turns off the backlight circuit for just a single burned out led. Toshiba might not work the same....Leave a comment:
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At this point I'm thinking it's the backlights that are the problem. One thing I don't understand though is how all 3 strings fail to light up with my tester. I understand that they share a common ground, but they are still 3 separate strings. It just seems unlikely that there is a bad led on each string. Usually just one is enough to shut down the circuit, and if it would still work with 2 out, then why not with 3? Idk, it just doesn't make sense.
Maybe, just maybe, the ground itself has a bad connection somewhere. This makes more sense, but also seems pretty unlikely as well.Leave a comment:
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I checked the filter caps tonight with my other meter and power off and they read about 380v.. Also, I put both probes into the led connector and powered on and it went up to about 4v and then instantly dropped....Leave a comment:
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I always check capacitors between their leads when possible. In this case I indeed did check between their + and - leads....Leave a comment:
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Your right, I forgot to recheck those with my other meter. I will do that tonight. Any ideas what would cause low voltage on these?...Leave a comment:
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I know exactly what you mean. Rather than pre-trained advice though, I think it scrapes the internet to find relevant information. I was surprised though when I uploaded a picture of the bottom of the board and it was able to determine how the LED connector is wired.
Anyway, I do want to get this figured out. I am willing to test anything I'm advised to if you all can point me in the right direction. I did take voltage readings on the connector while pressing the power on button and nothing changed. Something odd though is how this connector is diagramed. It's LED, NC, LED, NC, LED,...Leave a comment:
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This is basically what Gemini told me. It's designed to instantly go into protection. So, do I just roll the dice and order new LEDs? It's sounding like that's likely the issue....Leave a comment:
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I checked again yesterday with a different multimeter and it confirmed I am not getting voltage at the led connector. Even at power on its not coming up....Leave a comment:
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For what it's worth, I presented all of my findings to Google Gemini including the photos of the top and bottom of the board. It told me that these particular Hisense power supplies will immediately shut down the led driver circuit if the plug is not connected, which it was NOT connected when I checked the voltages. Likewise I checked them WITH the plug inserted and the results were the same. Gemini insists the backlights are the issue and the power supply is fine.
I've never personally seen a power supply NOT supply the voltage to the connector simply as a fail safe. I still am...Leave a comment:
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I will check again later with another meter. It was set at the only DCV setting it has, and the leads are non-removable. If the readings are correct, perhaps 40v is enough to satisfy the main board and tcon 🤷🏼
I 100% do have an image on screen and I can navigate the Fire OS with the remote....Leave a comment:
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Toshiba 75C350KU no voltage to LEDs
I got this tv a couple of days ago and i can see an image on screen with a flashlight but the backlights are not working.
First:
I put my backlight tester on the leads to the LEDs and I am not getting anything, but I'm not ruling them as failed because I've had other tvs before where this happens. I think it's because of how they are wired that causes the tester to think they are bad.
BUT:
I then got out my multimeter and started checking the board.
-I am getting no voltage/low mV readings on the LED connector.
-I checked the cluster of... -
If you replaced EC210 I highly suggest you go back and check it's solders. I've replaced this cap on 2 of these same boards now and both times the pad for the negative leg peeled right off the PCB and broke connection with the trace. To make it worse, the trace itself peels up from the board. I cut a short piece of copper wire and soldered it between the negative leg of EC210 and the negative leg of the nearby resistor....Leave a comment:
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Update:
I did not find out what was causing the low voltage, but I did get the tv working. Yesterday morning I very conveniently picked up a E4AA70R with a cracked screen and was able to retrofit it's PSU into the 65" (they were different sizes and had slightly different LED plugs). And, while the donor board WAS functioning, the usual suspect capacitor was horribly bloated and squealing. I replaced it before installing it into the 65". Working perfectly.
Oh, the power connector was also different. The original board used an internally connected power cord while...Last edited by x_orange90_x; 04-23-2026, 07:29 AM.Leave a comment:
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I'm working on a somewhat similar board from an Element tv. My board is a TV6505-ZC02-01. Same symptoms as everyone else, no backlights. I replaced the capacitor next to the LED connectors and no change. Also have no/low voltage on the LED connectors. I'd be willing to bet we all have the same failure. I've seen failed diodes cause this in a few different TCL tvs so I'm thinking maybe it's one of those....Leave a comment:
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I still haven't determined the cause of the low voltage
Any one have any ideas?Leave a comment:
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Just replaced it with a brand new one. Still no backlights. Even I check the voltage on the cap it reads 0v, just as the original did. Also, I'm only getting about 3v on the backlight connectors. BUT, like previously stated, my tester lights them up with 97v each string. So it looks like something else is bad....Leave a comment:
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Element E4AA65R no Backlights, testing good though?
This tv was given to me today with a power on-no Backlights condition. I removed the back cover and visually the capacitors look, decent.. More on this in a moment.
I checked both strips with my tester and they each show about 97v and I can see them fully lighting up through the holes on the back. Next to the backlight connectors it says 180v-300v, so 97v each is more than 180v. I would consider this to mean the backlights are good.
Back to capacitors now. A couple years ago I had an E4AA70R and it likewise had no backlights, and it was simply 1 bad capacitor (EC210)....
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