Re: Post The Led Backlights Your Fixing Here.
I'm replacing my edge LEDS now. Samsung UN55D6050TFXZA. The part # on the LED strips is 2011SVS55-FHD 5k6k, left and right.
I noticed there was some double stick tape on the rail in front of the LED strips, but did not appear to adhere to the LED strips. Is that double stick tape there to better secure the flat panels?
I bought a roll of double stick tape from ShopJimmy.com.
I think I can replace everything properly once my LEDs are reinstalled and connected. I bought some new screws to secure...
Vista20
Member
Last Activity: 06-09-2019, 10:35 PM
Joined: 10-26-2017
Location: Bay Area
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Samsung Service Manual, is it possible to obtain one?
I'm trying to repair a Samsung UN55D6050TFXZA that apparently has some bad LEDs. I purchased an LED testing tool and found the problem. Now, I need to disassemble the unit to get to the LED strips. I thought a Youtube video might help and found a few, but would like to rely on a Service Manual instead for disassembly. I looked for a Service Manual on-line and found a company offering them for $12.00 ($20.11 shipped), [url]www.samsungparts.com[/url]. ShopJimmy did not have them, has no stock on the LEDs for my TV.
I ordered from [url]www.samsungparts.com[/url] expecting to get a... -
Re: How to troubleshoot a BN44-00424A
budm,
Thanks, it looks like I've got some more work to do disassembling the TV. Then I'll grapple with repairing or replacing the LED strips. I've read that sourcing these particular LED strips is a problem.
I really appreciate your help.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
budm,
I tested the LEDs with the GJ2C by unplugging the backlight connection and with the red probe into #1 VF+ and the black probe into #3 (-), and the LEDs were visible through the chassis holes. Then I moved the red probe to #5 (+), and no lights.
Later today, when I get back home, I'll remove the PSU from the chassis, leaving all connections in place, and flip it over. I'll hook a jumper, with alligator clips, to the chassis and the board where one of the screws would be. This should ground the board, right?
...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Okay, I think I'm going to disassemble the TV in the next few days. Based on other posts regarding this model, replacement LEDs are hard to find.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
To check the voltage on the EVEN pins I'll have to unscrew the PSU and turn the board over. This will be hard to do with the LEDs plugged in.
So, if the LED is one large series string, wouldn't one burned LED prevent the rest from lighting? Also, I have a LED TV Backlight Tester GJ2C. I was able to see the backlight through the chassis holes when using this tester. I unplugged the LEDs and, using the tester, the LEDs can be seen lighting through the holes in the chassis.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Okay, looking inside the pin socket on the PSU I see the EVEN row of pins. I checked these with the main board unplugged. Not sure the status of the TV, whether ON or OFF.
Pin 2 N.C 0v
Pin 4 EPWM 3.1v cycling, not constant
Pin 6 N.C 0v
Pin 8 BLU ON 3v cycling, not constant
Pin10 GND 0v
Pin 12 GND 0v
Pin 14 A5V 5.3v STEADY
Pin 16 PS-ON 1.48v cycling, not constant
Pin 1 N.C 0v
Pin 3 B13V 11.89v cycling, not constant
Pin 5 B13V 0v
Pin 7 V amp 0v
Pin 9 V...Last edited by Vista20; 11-12-2017, 09:33 PM.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Okay, thank you, I'll give that a try tonight.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Also, I'm unable to determine if the TV is on or off. All I have to go by is the Power On lights that blinks when the AC cord is plugged in. I've tried to use the remote and the touch capacitance controls on the TV, but nothing changes with the Power On light, it just blinks away.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Budm,
I was taking those numbers from the photo I posted much earlier. So, I must be misunderstanding what they printed on the board, or what they printed on the board is in error. Please take another look at the photo of the PCB I posted earlier and let me know if I'm misunderstanding what is printed there.
Looking at the photo of the pin header, I only see pins by the ODD numbers, the pins where the EVEN would be are missing.Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Budm,
Thanks for sticking with me on this.
Actually, I read those voltages several times to make sure I was on the proper pin and double checked the reading on my meter. The photo I posted earlier shows a legend on the pcb, with the rated voltages per pin. I transferred that legend into post, exactly the way it appears on my psu pcb. So, maybe I'm not fully understanding the data printed on the board.
The GND pin 10 /9 has "Vamp" in the 4th column to the right on the pcb. I thought the legend printed on the...Last edited by Vista20; 11-12-2017, 06:57 PM.Leave a comment:
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Tested LED back lights w/o disassembly. Results?
As mentioned earlier, I used a LED TV Backlight Tester, GJ2C, without disassembling my TV. I see the lights through the many holes in the chassis.
1. Does this mean they're all functioning?
2. Could some of them be out while the others are not, allowing some light to show through the chassis?
3. Are the individual LEDS wired in parallel on each strip? Or, are they wired in series? I assume if they are wired in series, I would see no light at all.
4. Is this a reliable...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
I bought an LED TV Backlight Tester GJ2C and, with the TV assembled and the LEDs unplugged from the PSU, I checked the backlight. The LEDs lit up and could be seen through the holes in the chassis.
So, does this rule out a problem with the LED backlighting? Is there any reason to disassemble the TV and check LED strips individually?
Or, is the focus back onto the PSU for my problem. Andrew mentioned that the problem might be the PFC. With the parts in the BN44-00424A repair kit, which I purchased from ShopJimmy.com,...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Andrew, I disconnected the main board from the PSU but do not see any back lights through the holes in the chassis. I read the voltages again and found the B5V shows 5.35VDC is still present but not constant. All the other voltages 12V and 18V pins were still present but were now reduced by 1-2 volts and were not constant either. They are still cycling on and off.
The PFC, which I researched, stands for Power Factor Correction, is that right? And, if so, what part of the board and what component should I be looking at? Once I...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Andrew, thanks for replying. I've tried everything that you mentioned several times and wind up with the same results.
This is a Samsung UN55D6050TFXZA Ver. H301, PSU BN44-00424A.
1. All boards are connected.
2. My Fluke 117 auto senses the DC and auto adjusts.
3. Black probe is connected to chassis GND.
4. After unplugging the AC for several hours I plugged in the AC and measured CNM 803 pin 14/13, 5.35VDC is present but not constant. It's present for 2 seconds then drops to 0, then back up...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
I see that the kit I purchased from ShopJimmy contains MOSFETS, some fuses, a resistor, a film capacitor, and a few other IC components. There doesn't seem to be an on circuit test for the MOSFETS, and from what I've seen on Youtube, these will not show any exterior signs of a problem. It looks like I'll need to take them off the board to test them, and I'll replace them with new ones. The kit has two identical N-channel MOSFETs, however, when I test them one give a much different value than the other. Are value readings critical with these?...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Here is the pin out from the power supply board....Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Well, I tried it 3 times, unplugged the power cord, waited, restored power and read voltages. No changes from the voltages recorded after I actuated the remote and the I/O control. It's as if it's locked in one mode and I can't change it.
All the voltages recorded are not steady. The rated output voltage appears, then drops, then reappears at the rated voltage. Recycling....Leave a comment:
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Re: How to troubleshoot a BN44-00424A
budm, thanks for replying. I'm having trouble determining when the TV is in standby and when the power switch is on because the only thing that happens when I use the remote or press the I/O button on the TV is the Standby LED blinks rapidly for a second. This TV has controls on the bezel, but they're merely labels not actual buttons. I assume that they work via touch capacitance or slight pressure on the label.
I'll make a legend of the pins with their respective voltages. However, it will only be a guess whether the voltages are...Leave a comment:
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Re: How to troubleshoot a BN44-00424A
Update:
I rechecked my power supply pin out header with the main board connected. I was not reading the voltages correctly but now I think I have it.
On Pin 3 and Pin 5, I'm getting 12.70 Volts for a second and then it reduces to 0-1 volts, as if it's cycling on / off.
On Pin 13 and Pin 15, I'm getting 5.32 Volts for a second and then it reduces to 0-1 volts, also appears to be cycling on / off.
When I disconnect the main board from the power supply, the voltages seem to reduce to 0-1 and doesn't...Leave a comment:
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