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Bertron
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Last Activity: 07-01-2017, 09:48 PM
Joined: 06-18-2017
Location: ontario california
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    so I replaced C102 on the new board, and it worked! I had almost given up on this thing!

    thanks everyone for your help!

    in case anyone googles this in the future, I replaced the SMD C102 with a 47uF tantalum capacitor. I am not sure why even after replacing C102 on the old main board it still wouldn't fire up. Perhaps the EEPROM was bad on the old board, but good on the new one. If a klutz like me can do this with a 52 inch, anyone can ...
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    Last edited by Bertron; 07-01-2017, 07:06 PM.

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    and just for the sake of completeness this is what I see when I plug it in. Its a crapshoot between a normal image, a solid aquamarine, and a nasty glitched out screen before it shuts off and turns back on again. Its a big improvement over not turning on at all before. I already changed all of the power board caps and double checked that the new ones arent bulging.

    I really want to avoid removing and replacing anything on the brand new board, but it looks like thats the only option I have left....
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    Last edited by Bertron; 07-01-2017, 05:07 PM.

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    So here's an update.

    I received the new main board in the mail, swapped it out, double checked all connections and now I get a loud squealing out of the speakers and the occasional samsung startup noise before it shuts down. It does this repeatedly with no image. Going to poke around a bit, but at least I am getting something apart from just clicking on this set.

    Ideas? Does the squealing and startup 'jingle' provide any clue as to what it might be?
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    Yes, unfortunately the clicking is still there

    I [I]did[/I] check for an image when the backlights came on and there wasn't any, simply the glow from the light. Those moments when the backlights werent on, I also shined a flashlight into the screen to see if there was an image in there somewhere and that also didn't produce any results.

    I think I'm just going to wait for that main board to arrive. This is way too much time to invest on this project at this point.Re: Samsung LN52A550P3FX2A,
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    Last edited by Bertron; 06-25-2017, 07:07 PM.

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    if you are referring to the tiny connections between the upper half and the bottom half then its labels are

    GND
    FB
    VCC(+12V)
    PROT
    LOOP2
    LOOP1
    PROT1_1

    thanks for clearing up the inverter/balancer nomenclature. One step closer to knowing what the heck is wrong with this thing and how I can get a shiny new 52 inch to watch tv on....
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.



    regarding this post, should I hold one lead in the first arrow then use the second lead to test the other arrows sequentially? The first pair of errors gave me an OL signal as much as I tried to wiggle them and make good contact. The second pair of arrows gave me 2 ohms.

    I tested the cables joining the two halves and the continuity is there for both left and right sides...
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    [B]PROT1_1[/B] reads [B]0.027V[/B], but quickly jumps to [B]11.26V[/B] when it clicks and the backlights come on, only to quickly fall back down to 0.027V[B]

    VCC(+12V)[/B] reads [B]12.08V[/B]

    EDIT:will check the transformers being connected in series after some dinner. This troubleshooting is exhausting Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    [B]PROT1_1[/B] reads [B]0.027V[/B], but quickly jumps to [B]11.26V[/B] when it clicks and the backlights
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    Last edited by Bertron; 06-25-2017, 05:31 PM.

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    The ribbon cable runs to what looks like another inverter on the opposite side of the tv set as seen in picture 1. It runs along the bottom of the tv.

    The model of the power board is [B]BN61-03012A #6 DH06[/B] as written.

    I attached other pictures. It looks like the inverter model numbers are [B]SSB520H24V01 REV0.3[/B] I had to disconnect two cables to see the model number but I reconnected them afterward.

    The transformers seem to have the number [B]388R B0829[/B]...
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    So in the previous 2 posts I put the resistors in individually while keeping the other cable plugged in. This time I put the resistors in both cables at the same time. I got a backlight after the initial click that lasted roughly 3 seconds then it clicked off and did not return. When I unplug and wait 10 seconds to plug it back in again, the same thing happens.

    Can a backlight be bad, even if it comes on for a few seconds?

    I attached a pic of the light I saw shining through the...
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    I ordered a main board. I just don't have the time or patience or remove and install a new component that might or might not work. If the main board doesnt work, this thing is going into a landfill. I will update the thread once I receive and install the new main board so people googling in the future can get a sense of what I did.

    Thanks for taking the time to help me out, everyone
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    I used a tantalum capacitor like the one pictured here:

    I made sure I put it in the right way

    I went to three separate electronics stores and just couldn't find the tiny SMD caps. Why is it so hard to find those outside of the internet?

    Did I screw up by using a tantalum cap? ...
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    Last edited by Bertron; 06-25-2017, 08:44 AM. Reason: wrote down wrong type of cap that I used

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    steady 4.98V throughout on INV ON/OFF, except for when it clicks on and it makes a brief jump to 5.00V
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.


    AHA. After connecting the 1.5kohm resistor to INVERTER ON/OFF and DET_5V the backlight came on for 5 seconds then a *click* and the backlight went off for approximately 15 seconds.... then it came back on for 5 seconds... then off, and on and off and on.

    It doesn't stay on solidly, but it's good to know that the backlight at least works.

    I hope this sheds some light on what direction I can take on the repair. Thanks!...
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    ok I put back the 1.5kohm resistor and here are the results I got from each connection with the 1.5kohm resistor in place and the TV plugged in:

    [B]CN801[/B]
    PSON...............3.75V
    SYNC...............0
    STB.................5.17V
    13.0Vs.............13.31V
    5.1V.................5.1V
    13.0Vm.............13.21V

    [B]CN1805[/B]
    INV ON/OFF.......0.001V
    PWM DM...........0V
    DET_5V.............5.17V

    [B]CN1806[/B]
    FB...................0V...
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    Last edited by Bertron; 06-24-2017, 11:01 PM.

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    I'm a dolt. The resistor in that picture is actually 1.5kohm, not 15.

    anyway, I tried a 15 ohm resistor in the same configuration and I still didn't get a backlight.
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.



    So I tried what you suggested with a 15kohm resistor and the backlight still didnt come on. I did notice a [B]very[/B] faint squeaking coming from the 'HOT' side of the power board that I normally don't get. I made sure the resistor made good contact with the connector and even tried to unplug and replug the power back in. No success. What does this tell me about what steps I should take next?

    Thanks again, without help I would be totally lost.Re: Samsung LN52A550P3FX2A, blinking red...
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    dragon, I have tried disconnecting the main from the power supply and the backlights do not come on. How would I use the 1k resistors, exactly?
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    so I replaced C102 on the main logic board and the television still does the same red blinking and clicking on the power board. When I try to power it on with the remote, the red blight strobes/blinks rapidly as if it knows im pushing the buttons, but I still have a complete lack of backlight. Could use some more suggestions.
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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    so I tested a connection called CN1805 that goes from the power board to the main board with readings as follows:

    INVERTER ON/OFF...................0.038V
    NC.......................................0V
    PWM DIM..............................0.425V
    GND.....................................--
    DET_5V.................................5.13V


    is that voltage way too small for the INVERTER ON/OFF signal? I have no idea what it [I]should[/I] be. Thanks again to...
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    Last edited by Bertron; 06-24-2017, 09:51 AM.

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  • Bertron
    replied to Samsung LN52A550P3FX2A, blinking red light in front. No backlight.
    in Troubleshooting TVs and Video Sources
    Re: Samsung LN52A550P3FX2A, blinking red light in front. No backlight.

    [url]http://imgur.com/a/ZAuQX[/url]

    uploaded the pictures to IMGUR as part of an album for this repair

    I took the voltage readings for that whole connector. The readings are as follows:

    DESIGNATION.................READING
    13.0Vm.........................13.15V
    13.0Vm.........................13.15V
    13.0Vs..........................13.57V
    STB5.1V........................5.16V
    Sync.............................3.192V
    PSON............................14.09V...
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    Last edited by Bertron; 06-24-2017, 09:09 AM.

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