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kca
Badcaps Veteran
Last Activity: 10-22-2023, 05:32 AM
Joined: 02-05-2016
Location: Morgan Hill, CA
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Thanks, nomore ~

    That’s very interesting. Never saw that video before. I’m going to gather up some 9v batteries and give that a try. I’ve got the 100 Ohm resistor but may need to purchase the finer point probes.

    But this seems like the easiest, most seamless way to test these various LED strips without the risk of damaging other boards or components.

    Much thanks !!

    I’m grateful you persevered. . I will too.

    ~ kca
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Yes, that’s the Catch-22.

    But if I knew how to attempt a jump of the backlights on then at least that stands a chance of them coming on and eliminating them from the problematic picture.

    It’s always frustrating when the fault design allows for the 5 red blinks to be EITHER the PS supply OR the backlights. That, at least, appears to be the case with the fault codes.

    Would be so much easier if the backlights not working would produce their own, singular fault...
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Here are the voltages in detail on the primary connector:

    First, the odds

    1 (LD) = 3.6 (note, this pin does not have a wire leading to the main board: it is empty)
    3 (GND)= 0.0
    5 (B13v) = 14.7
    7 (B13v) = 14.7
    9 (SDA) = 1.0 (note, it only read 0.5 the 2nd time I measured it just now)
    11 (SCL) = 3.7
    13 (GND) = 0.0
    15 (B13v) = 14.7
    17 (B13v) = 14.7
    19 (VAMP) = 14.7
    21 (VAMP) = 14.7
    23 (GND) = 0.0
    25. (B5v) = 6.1...
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    Last edited by kca; 10-21-2023, 11:59 AM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Okay. I’ll check them all again and list them in the next post.

    In my original post, I didn’t make it perfectly clear but I had tested all of these pins (1 through 28) and the only one I found suspect was that SDA line I was discussing earlier in the thread. I’ll post exact voltages for all 28 pins to help clarify all of that.
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Yes, it appears this model’s PS is designed to supply voltage directly to these dual LED cables via the two connectors. As I mentioned in an earlier post, the readings on both the middle left LED connector and the bottom left LED connector are 0.0 on all of those pins.

    In other words, it appears that the PS is failing to supply these LED connectors and cables with the necessary voltages. But, could it also be that the failure of the backlights themselves might cause the voltages to be denied...
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Here are the pertinent images of the PS board we're discussing:

    Photo #1 = Entire PS
    #2 = top left (primary) connector voltage chart
    #3 = middle left connector chart (heads out directly to one of two LED cables)
    #4 = bottom left connector chart (heads out directly to the other LED cable)
    #5 = image of the two “twin” LED cables themselves...
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    Last edited by kca; 10-21-2023, 10:27 AM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Yes, that is what I established a few days ago. No backlights appear. So now I’m trying to determine if the backlights are indeed functional before I either replace components on the PS board or just buy a new PS.

    I can get a power supply board for only $42, but I want to prove that the backlights are operational before considering the PS purchase. I’ve read several posts that explain that the backlights can often be jumped on but I don’t know exactly which pins / resistors / boards...
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Given the pictures I posted earlier, does anyone know how I can safely force the backlights on re: this particular model Samsung tv?

    I would like to prove or disprove that the backlights are still functional. What would be the exact steps that it would take to jump them on?

    ~ kca
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    Last edited by kca; 10-21-2023, 06:34 AM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Wondering if anyone can provide an answer to that last question as it pertains to this particular model of television (Samsung UN60F8000BFXZA).

    I’m trying to determine if the LED panel itself has stopped working as opposed to the Power Supply board being the culprit.

    ~ kca
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Quick question:

    I'm getting 5.7v on the PS connector that leads over to the main board. So that is fine. But when I pulled the two other connectors on the PS that both lead directly to the panel itself I get 0.0v on every pin.

    Does that mean that the PS is not providing voltage to these connectors or could it mean that the tv senses the connectors have been pulled and it then automatically denies voltage at the PS level so that it never reaches the connectors in a purposeful way...
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    Last edited by kca; 10-16-2023, 12:20 PM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Yes, I figure the processor is damaged on that original main board. Reflowing it had no effect. I tried it twice, actually, about 5 days apart from one another. Baked the board in the oven at 385 degrees for 10 minutes each time. That method has worked about 75% of the time over the years whenever the HDMI ports are the only thing defective on a set.

    At that point the screen still lit up and I watched tv via the coax cable for a couple days until the picture quality drove me crazy. That’s why...
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    Last edited by kca; 10-14-2023, 07:17 PM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Alright.

    Good idea with the hair dryer heat. I’ll try that next. Hopefully that triggers something and narrows down the bad cap search.

    There are no backlights. Those have been out for about a week now. When the original main board was in place (and the only problem was that the 4 HDMI ports were not functioning) then yes ~~~ I was able to disconnect the cable to that main board and get the backlights to illuminate the entire screen. I’m not sure why the backlights ceased...
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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    A few more images:

    ~ kca

    Looks like the photos got uploaded in upside-down fashion again. I don't know why that happens sometimes. But you get the general idea of the layout....
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    Last edited by kca; 10-14-2023, 07:01 AM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    In the process of a few more voltage tests, but I have a couple cap related questions:

    1. I’m counting 11 electrolytic caps, 3 ceramic caps and 2 square box type caps on the cold side of the board. Are you recommending that I have to replace them all because there’s no definitive way to assess them?

    2. Are we saying that the faulty cap or caps are preventing the LED lights of the panel to initiate and that’s why there is no picture on the screen and no discernible backlights...
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    Last edited by kca; 10-14-2023, 06:36 AM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Thanks for the help so far. Nomoresonys ~ Here’s an update that will likely reorient us:

    Put the original main board back in. Whereas this read 0.6v on SDA at the main board’s connector a few days ago, it now is reading a full 3.5v on both the main board connector side as well as the power supply board connector side. It all appears to be correct. Did not see that coming. Note: a few days ago, when I measured, I only did so at the main board connector.

    I also plugged and...
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    Last edited by kca; 10-13-2023, 10:05 AM.

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  • kca
    replied to Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources
    Re: Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    UPDATE:

    Checked all the caps on the power supply board. All OK. At that point, I measured the voltages at the exit connector of the power supply board with the end of the cable at the main board fully disconnected.

    Now, the 2,6v reading on the SDA line is reading 3.6. So, with no main board in play, the power supply board seems to be fully functioning. All 13 voltages read at or slightly above the levels indicated on the printed circuit board itself. Note: The primary voltages are supposed...
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  • kca
    started a topic Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks
    in Troubleshooting TVs and Video Sources

    Samsung UN60F8000BFXZA ~ No Picture or Sound - 5 Res Light Blinks

    Hello all ~

    I’m working on this Samsung 60” LED and purchased a new main board a couple of days ago that did not fix the 5 blink issue. The original main board’s HDMI ports (all 4 of them) failed to work and no amount of reflow remedied that.

    This 5 red light blink code on the front panel LED is followed (about 15-20 seconds afterward) by an automatic reboot, and results in 5 more red light blinks. Then the entire cycle repeats itself indefinitely.

    No picture. No sound.

    I tested all the voltages coming out of the power supply...
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    Last edited by kca; 10-12-2023, 05:29 PM.
  • kca
    replied to Vizio M50-C1 ~ Fix (Explained)
    in Troubleshooting TVs and Video Sources
    Re: Vizio M50-C1 ~ Fix (Explained)

    That's true. This is best done in a dedicated toaster oven or the like that serves no other purpose.
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  • kca
    started a topic Vizio M50-C1 ~ Fix (Explained)
    in Troubleshooting TVs and Video Sources

    Vizio M50-C1 ~ Fix (Explained)

    Hello all ~

    Just had success in fixing up a Vizio M50-C1 that was showing the following signs / behaviors:

    1) No backlights
    2) 16 blink code followed by five consecutive rounds of 13 blinks each with about a minute and a half in between each
    3) Power supply had appropriate voltages, even if they were momentary before they quickly began to drop off
    4) Pulling out the connector leading from Main Board to T-Con changed nothing
    5) Pulling out the two ribbon cables (left and then right) leading from the T-Con to the panel itself changed nothing....
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  • kca
    replied to LG 47LS5700 ~ Image is faint, mostly white
    in Troubleshooting TVs and Video Sources
    Re: LG 47LS5700 ~ Image is faint, mostly white

    Hello ~

    Thanks for that tip. I will test those but just want to make sure that I have interpreted your note correctly. When you say the driver board between the T-con and the panel do you mean the Y-Sustain board? (The one that immediately precedes the upper and lower buffer boards).
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