Re: Samsung UN40D6400UFXZA Power Cycles
Don't know if I should try spending $90 on a main board for a 40" lcd
Don't know if I should try spending $90 on a main board for a 40" lcd
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Re: Samsung UN40D6400UFXZA Power Cycles
If you had to guess at which board to try would it be the tcon or main board?Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
Figured out the problem in my case. The LEDs. I have started a separate thread.Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
Hi , have you found the problem of Samsung tv ( power cycles ) ? my TV has the same issue .Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
In my case it was burned out LEDs.Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
Thanks Malachi .Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
I have found an LED open circuit on backlight after replaced TV work again . Thank you for your tip . This will help someone have the same problem .Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
Ok so I had a problem with this Power board and t turned to to be cold solder joints.
Using the shop jimmy pic provided earlier in this thread I re-flowed all the joints highlighted and it fixed my clicking problem. I hope this helps someone in a similar situation.
Thanks for all the info.Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
Hi Twilliard, were you able to resolve the issue, what was the solution?Comment
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Re: Samsung UN40D6400UFXZA Power Cycles
Hi! I decided so share my experience with this power cycling issue on a UN40D6400UFXZA Samsung led smart tv.
So i had a cycling issue with this tv, when i turned on the tv only a smart logo was shown for a half a sec and the tv was cycling to the eternity.
In my case was a faulty led. When i disassembled the tv, i found a single led on the strip, which is came off just by touch. So basically just shorted the led pads with a big solder blob and end of story. The tv working fine ever since.
But the most valuable hint when it comes to repair this kind of tvs, especially if u have power cycling issue, is that u need to find in the datasheet (yes datasheeet is crucial if u want to troubleshoot your tv, or at least get a similar one).
So every led tv has one or more led strip driving ics. This tv has 2. Every led driver ic has a FLAG pin which goes to the main board. That flag pin is going high (i believe - did not tested) if there is too much or too less curent was flowing to the led strip.
So just break the flag line ( take out a resistor) and the power cycling should stop (of course if your problem is about the led strips).
After that u can turn on your tv, and check which led strip is not lighting up. Also u can check the voltage on the output capacitors ( if one of your led strip is not lighting up the in the corresponding capacitor u will have much more voltage than on the other ones).
Well i hope i helped a bit!Comment
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Samsung UN55FH6030, perfect size for my office and does OTA well but isn't a smart TV. That's OK because I am a TV station engineer and only need it for OTA monitoring.
About a month ago it started power cycling itself once or twice a day and now it's nearly continuous once it's been on for a few minutes. Changing channels would really start it cycling and it would take several minutes to stabilize but now it's just doing it almost non-stop without changing channels.
Once I disconnected the antenna I found that I could change channels with no issues. My guess is... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hello everybody, I could use some help on this one... It's got me guessing...
I took pictures of all the boards and the pin out of the connector on the power supply that goes to the main board... I measured all the pins in relation to chassis ground, here are the result.
(B13v)1. 12.7 volts cycling (Vamp) 2. 12.7 volts cycling
(B13v)3. 12.7 volts cycling (PWM5) 4. 1.0 volts cycling
(OD_LE)5. 2.8 volts cycling (PWM4) 6. 0.9 volts cycling
(OD_ON)7. 2.8 volts cycling (PWM3) 8. 0.9 volts cycling
9. ground (PWM2) 10. 0.9 volts cycling... -
Hello,
I have re-soldered the loose pins on the RAM slot which is a common fault on these models..
It charges and turns on the power LED but is missing several voltages like RAM and CPU do not come up which I believe is due to MAINON & SUSON being missing to turn these supplies on..
What I am un-sure of is what is the ITC chip waiting for to send out these signals, what are the requirements?
I have checked these lines in diode mode and they seam normal -> 600.
I have checked to see if they come on for even a fraction of a second... -
Hi
Picked up another TV. Samsung UN43NU6950FXZA. No power and no standBy led on. Removed back cover and:
Main fuse = OK
Back light LED = OK. Power them with aux power source
LED output = OK 156V
I do get 12 V DC out of the power supply going to the digital section but no 5V or 3.3V. PS_on voltage is only 1.8V. I have looked everywhere on the PCB , I could not find i reference for 5V output.
Also removed connections to panel, speakers and remote but no luck. One strange thing is that even with the LED power supply working, backlight LED do not turn on...
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