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mrtek
Senior Member
Last Activity: 10-14-2025, 05:42 PM
Joined: 10-28-2010
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this is what is missing.
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I just noticed that there is no connection between T-CON and TV panel.
I can see the connection from Main board to T-CON but no other connection from T-CON. Is it possible that main board shuts off if that connection is not detected?...Leave a comment:
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it looks like the main board is driving the LEDs. Could you get a closeup picture of the second connector on the main board on top of the one coming from the power supply?Leave a comment:
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After trying to troubleshooting this PCB, I have purchased another one. TV is up and running.
MassimoLeave a comment:
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I did have already a hot air reflow station and I purchased a large nozzle . I have read , on some post what temperature was used to reflow the same kind of CPU after the heat sink was removed. Used some liquid flux on the 4 side of each CPU and set the temp at 350F. For a couple of minutes I kept the nozzle at about 2 inches. After 2 minutes I brought the nozzle closer to about 1 in for 3-4 minutes. After that I brought it back up to 2 inches for a total of 8-9 minutes. That seemed to do the trick. I understand it maybe not be a final / permanent solution, but for now I proved that no other...
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Hi all again.
I was able to generate the 12V for the T-Con on the main board. I was able to find a datasheet for the mysterious IC listed above 5358A.The actual part is G5358A ( High Efficiency 4A Synchronous Buck Converter )
made by some company in Asia. See attached datasheet​.( ) It appears that on the main board there is the same regulator producing 5V.(input is 19V from PS) According to the datasheet, there is EN pin (#5). This pin is connected to the CPU by one resistor (16.5K) on the other side of the board. I placed the same resistor on location R7018 This connection...Leave a comment:
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This is a better image of the component in question ...
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Hi All
I was able to revive the main board by removing the huge heat sink and reflow the 2 CPUs. Now the On/OFF signal to power supply is at 3.3V when the power button is pressed. The backlights are turning on but no image on the screen. I figured out the there is no 12V on either side of the FUSE on the T-Con board. This voltage comes from the main board. No shorts on the main board for 12 V but it looks like the voltage is generated by this IC U713 on the back side (Q503 5383A are the markings on the IC). The output of this IC, is exactly where the Ref. Des. U703 is located in the image...Leave a comment:
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Received a replacement board today. I could not wait to plug it in and see my TV turn on. Unfortunately the same behaviour remained. StandBy LED turns on and fades away and the OFF/ON signal at power supply board never goes HI/ 3.5 Volts. Am I missing something?Leave a comment:
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as of today ...TV is still running...It is a big mystery....Leave a comment:
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pin 17, 18, 19, counting from the left side, as shown in the image...Leave a comment:
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What happens if you disconnect the cable from the main board to the buffer boards / panel?
Some pictures would be nice....Leave a comment:
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These are the pins I have masked but in your case it may be different.
...Leave a comment:
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My issue is completely different..I think..it never turns on,, the ON /OFF signal is very low. Only .147 V from main board....Leave a comment:
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...and still working...Leave a comment:
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Samsung UN43NU6950FXZA No power
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... -
Thank you for the info....Leave a comment:
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TV has been working every single day. Every day turn it on and at night I shut it off....Leave a comment:
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I would apply the tape method on the right side and see what happens. I did the same thing on my 50 inch Samsung.
https://www.badcaps.net/filedata/fet...3&d=1752628126...Leave a comment:
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After further inspection I have noticed that maybe some components are missing from this device on the bottom side of the board close to the connector that carries signal to the power supply.
can anybody help me confirm if those locations are filled? what about the value ?
Thank you
Massimo...Leave a comment:
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