Well lets make sure on that resistor, is it visible on here, if not what are the colors on it?
Announcement
Collapse
No announcement yet.
Samsung UN50KU6300F constant reboot, bad backlights?
Collapse
X
-
SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
-
Originally posted by nomoresonys View PostWell lets make sure on that resistor, is it visible on here, if not what are the colors on it?Last edited by x_orange90_x; 02-20-2024, 10:11 AM.
Comment
-
Grab the data sheets of both and compare them.SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Originally posted by x_orange90_x View PostI tested the SK34 diode on the bottom and it appears to be bad. It checks .298 both directions with one meter and 4.8 both directions with my other meter.
I have a spare board with a similar size but it's an SK510C. Could I safely use this in place of the SK34?SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Here's one resistor chart, pretty easy to use, check some other resistors to see if you get a correct reading, wondering if your meter battery is ok: https://kiloohm.info/smd4-resistor/1004SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Shit, my bad, that one is for surface mount, let me grab the thru hole one, here: https://www.digikey.com/en/resources...tor-color-codeLast edited by nomoresonys; 02-20-2024, 06:45 PM.SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Is it black-blue-silver-gold, I get .06 ohms, if those colors are correct, then even 1.2 ohms is way out of specs, then as usual when a reading seems off in circuit lift a leg and check ooc.Last edited by nomoresonys; 02-20-2024, 06:57 PM.SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Originally posted by nomoresonys View PostIs it black-blue-silver-gold, I get .06 ohms, if those colors are correct, then even 1.2 ohms is way out of specs, then as usual when a reading seems off in circuit lift a leg and check ooc.
I checked other resistors on the board and got similar oddball readings. I think the resistor ok. That one diode on the bottom has been mentioned on these forums several times as causing these symptoms. It's surface mount, so if I take it off to test I'd be replacing it as well.
Comment
-
Absolutely, I do believe that diode is bad.SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Originally posted by nomoresonys View PostAbsolutely, I do believe that diode is bad.
Ir is blank on the datasheet for the SK310C.
Comment
-
SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
I replaced the diode on the bottom and I STILL have the same symptoms!
Edit: I removed a leg of that resistor and checked it. It reads 0.00 ohm 😑Last edited by x_orange90_x; 02-21-2024, 10:32 PM.
Comment
-
Originally posted by x_orange90_x View Post
black, blue, silver, gold is correct. When I looked it up I got 600 M ohms. Maybe I did something wrong
I checked other resistors on the board and got similar oddball readings. I think the resistor ok. That one diode on the bottom has been mentioned on these forums several times as causing these symptoms. It's surface mount, so if I take it off to test I'd be replacing it as well.
Comment
-
Originally posted by diif View Post
Double check the resistor value using one of the many available websites.
Also, my reading of 0.00 ohms means my resistor is bad, right?
Edit: it has to be silver because that's .06 Ohms. Grey would be 600 MegaOhms. I can't however find a .06 Ohms resistor online.Last edited by x_orange90_x; 02-22-2024, 05:35 AM.
Comment
-
It looks like it can't be either of those. 600 M ohms would be a huge resistor, and from what I'm finding .06 ohm doesn't even exist.
I can't find a schematic for this board either
Edit: wow this is frustrating. I can't find a schematic, therefore I can't see on paper what the value is supposed to be. Likewise, searching for the board number and "R9022" turns up absolutely nothing. And to top it off I'm finding this exact same model board with a completely different 5 band resistor instead of the 4 band I have.Last edited by x_orange90_x; 02-22-2024, 06:20 AM.
Comment
-
I gave up on diagnosing the original board and just ordered one from eBay. I put it in last night and the tv is working great.
My advice to anyone else with this model power supply is to just get a replacement. There's too many things that fail on it and getting it working may only buy a little bit of time before another component fails.
Comment
-
Glad to hear it, Indeed when you figure all the time that can be spent trying to troubleshoot, if a board is available for a fair price, it sure can be the best way to go, it may also preserve a little sanity, lol.SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
My guess is the backlight driver IC on the non-working powerboard may be bad, seems like you checked everything else.SIGNATURE
Basic powerboard testing, most troubleshooting starts there: https://www.youtube.com/watch?v=4v8DcqCNG4A
Don't forget to inspect solder joints on underside of powerboard and check for obvious damage, often overlooked but simple procedure. Just be sure the high voltage capacitors are discharged, youtube has many videos on the subject, 400 volts can KILL, using a screwdriver to discharge capacitors is something I would NOT advise: https://www.youtube.com/watch?v=aEupCE9btEU
Comment
-
Originally posted by nomoresonys View PostGlad to hear it, Indeed when you figure all the time that can be spent trying to troubleshoot, if a board is available for a fair price, it sure can be the best way to go, it may also preserve a little sanity, lol.
Comment
Comment