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Samsung UE40D5500RW TV Continuously Turning On and Off: Identifying & Replacing Motherboard

jachu876 149595 66
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How do I repair a Samsung UE40D5500RW that boots for a few seconds and then keeps restarting, and does the replacement mainboard have to be an exact match?

If you replace the whole main board, it should be the exact same board number, but this reboot loop on Samsung D-series TVs is usually caused by the NAND flash on the motherboard rather than the power supply [#15229393] [#16440643] The posts describe this symptom as a damaged Flash/NAND issue, often on the chip marked IC1302 and identified as K9GAG08U0E in these models [#16440713] [#18653653] The recommended repair is to replace the NAND with a new, correctly programmed chip or buy a pre-programmed one, and some users reported success after soldering in a pre-programmed flash [#16440713] [#17488875] [#20470114] Freezing the chip can make the TV start again, but it is only a temporary workaround and later failures are common [#17740879] [#20217083] So the best long-term fix is a programmed NAND replacement; if you buy a full board, match the original part exactly [#15229393] [#18653653]
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  • #1 15229326
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Hello.

    As the topic. Tv starts up for 2-4 seconds and turns off. Over and over again.

    After disconnecting the motherboard, the matrix lighting is on.
    The power system is operational. The voltage at the output to the motherboard is correct.

    I suspect the motherboard, but I am not 100% sure.

    The motherboard is: UE 40 D 5520 974B MAIN 1018.1 SUB 1003 10/28/2011
    SK10BN9405065CD2U4BAQ3175

    I wrote everything down from the sticker on the motherboard.

    I will risk and buy a used motherboard.

    My request.

    What motherboard should I buy?
    Does it have to be identical to mine?

    greetings
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  • #2 15229393
    Piko
    Level 22  
    Posts: 693
    Help: 47
    Rate: 109
    jachu876 wrote:


    Tv starts up for 2-4 seconds and turns off. Over and over again.



    It starts and you can see something on it, some menu, graphics, anything? Or just backlight?
    However, I would bet on the power supply. This is Samsung after all!
    And as for the purchase of the album, yes, only the same. If you are not looking for the hassle?
    Regards, Piko.
  • #3 15229408
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Everything is normal when it turns on. First the logo, then the program. The image displays normally. The remote is working. The menu too, but I can't do anything about the menu, because 2-3 seconds and it restarts.
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  • #4 15229440
    Piko
    Level 22  
    Posts: 693
    Help: 47
    Rate: 109
    So in my opinion, the power supply is not producing the current ... or the inverter takes too much power? You have to investigate it yourself.
    When it snaps, there is no point in restarting it ... from the beginning .. (unless ... a case of one in 1000?).
  • #5 15229452
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    I would also like it to be a power supply. Easier to fix and lower cost. I just have a gauge to test anything
  • #6 15231325
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    The output voltage of the inverter is 197V. However, the description shows 268V
  • #7 15240134
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    As for the power supply, what should I pay attention to and what to measure to make sure that the power supply is operational or not?
  • #8 15246812
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Samsung UE40D5500RW TV Continuously Turning On and Off: Identifying & Replacing Motherboard Samsung UE40D5500RW TV Continuously Turning On and Off: Identifying & Replacing Motherboard Samsung UE40D5500RW TV Continuously Turning On and Off: Identifying & Replacing Motherboard

    Added after 3 [minutes]:

    This is what the power supply looks like. What would I possibly have to measure on this system to exclude whether it is operational or not?
    I also uploaded a photo of the motherboard. If the power supply turns out to be functional, then the fault must be on the motherboard.
    Would I have to find the same motherboard or some similar model will also fit.
    I will try to reward you for your help
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  • #9 16099623
    wivan
    Level 1  
    Posts: 1
    Rate: 13
    Hello,
    I have the same problem with my 37D5500. Were you able to remove the fault?
    greetings
    Wojtek
  • #10 16104823
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Hello. The motherboard was damaged. I don't know what exactly went on the motherboard, because I bought a second one.

    Greetings Tomek
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  • #11 16420810
    tlapka
    Level 10  
    Posts: 5
    Rate: 10
    Hello, I have the same problem with this Szajsung. Is this certain information that the motherboard is the cause of the reset? Tv resets every few seconds, picture and everything works fine, there's nothing you can do.
    Thank you in advance for your help.
  • #12 16420843
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Hello
    Probably the cause will be a damaged motherboard. You can check the power supply to be sure, but such a symptom indicates the motherboard.

    greetings
  • #13 16440643
    Metiusz
    Level 11  
    Posts: 45
    Help: 2
    Rate: 36
    Flash memory damaged

    Added after 1 [minute]:

    You have damaged Flash memory on the motherboard in these Samsung phones.
  • #14 16440704
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    How can this be fixed if it is actually a flash drive? Because I have a damaged disc with such symptoms.
  • #15 16440713
    Metiusz
    Level 11  
    Posts: 45
    Help: 2
    Rate: 36
    Desolder the NAND Flash memory with the one with a white label and program it.

    Added after 2 [hours] 54 [minutes]:

    If the samsung Ue40d5500 tv and his whole family of this model get up and show the Smart logo and reset after that, it is Flash's fault at 99%.

    When it comes to repair, it depends on your skills, you need such a programmer and a new batch. You can also buy a batch on the Wroclaw tv service, depending on your skills, it is best to buy and copy from them and then you can take hay for repairing the tv. :-)
  • #16 16845984
    tomasz wojcicki
    Level 23  
    Posts: 848
    Help: 26
    Rate: 346
    Unfortunately, but with this type it's not that easy :P
  • #17 17488875
    arekmilan
    Level 11  
    Posts: 14
    Rate: 10
    I had the same problem. I did not replace the board, but I bought a pre-programmed flasch chip on ebay, everything returned to normal after soldering.
  • #18 17489854
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Hello, how much did that amount to you?
  • #19 17491004
    arekmilan
    Level 11  
    Posts: 14
    Rate: 10
    I'm in England and I was buying for ? 23. It's cheap for me
  • #20 17491858
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Cheap for me too, because I gave 250 for the album ?
  • #21 17704364
    Piotrjar
    Level 12  
    Posts: 14
    Rate: 10
    Hello
    I know that the topic is old but still valid.
    I have the UE40d5500 with a slightly cracked matrix, but it can be watched.
    Replacing memory or motherboards does not make sense (prices start from PLN 100 up).
    I rummaged and found 2 sites that make the tv work.
    1.According to the video, I reset to factory settings, but the tv kept turning off.
    https://www.youtube.com/watch?v=DDzOSdfA41s
    2. According to the description on the tv page, he came back to life. I used a freezer from the pharmacy because there was one at home.
    https://forum.iwenzo.de/samsung-d-serie-bootloop--t65089.html%EF%BB%BF

    I hope tv will work a little longer.
    greetings
  • #22 17705310
    jachu876
    Level 11  
    Posts: 80
    Rate: 115
    Hello, the memories are for about PLN 150. I have not tried this method. I decided to replace the TV at the next failure.
    greetings
  • #23 17706115
    tomasz wojcicki
    Level 23  
    Posts: 848
    Help: 26
    Rate: 346
    1: 5 that it will not travel 6 months longer.
  • #24 17740879
    dominiss1990
    Level 1  
    Posts: 1
    Rate: 4
    Piotrjar wrote:
    Hello
    I know that the topic is old but still valid.
    I have the UE40d5500 with a slightly cracked matrix but it can be watched.
    Replacing memory or motherboards does not make sense (prices start from PLN 100 up).
    I rummaged and found 2 sites that make the tv work.
    1.According to the video, I reset to factory settings, but the tv kept turning off.
    2. According to the description on the tv page, he came back to life. I used a freezer from the pharmacy because there was one at home.

    I hope tv will work a little longer.
    greetings


    @Piotrjar the other way worked. Just turn on the TV and start freezing (I also used a freezer from the pharmacy), we freeze until the TV goes into normal operation - for me it happened after literally 5 seconds. And so far the TV works again :)
  • #25 18009875
    raffael82
    Level 9  
    Posts: 6
    Rate: 6
    dominiss1990 wrote:
    Piotrjar wrote:
    Hello
    I know that the topic is old but still valid.
    I have the UE40d5500 with a slightly cracked matrix but it can be watched.
    Replacing memory or motherboards does not make sense (prices start from PLN 100 up).
    I rummaged and found 2 sites that make the tv work.
    1.According to the video, I reset to factory settings, but the tv kept turning off.
    2. According to the description on the tv page, he came back to life. I used a freezer from the pharmacy because there was one at home.

    I hope tv will work a little longer.
    greetings


    @Piotrjar the other way worked. Just turn on the TV and start freezing (I also used a freezer from the pharmacy), we freeze until the TV goes into normal operation - for me it happened after literally 5 seconds. And so far the TV works again :)


    Hello,
    I had the same problem, I did the second way in the following three steps and after the problem :)
    1. Remove the back cover of the TV to access the motherboard
    2. turn on the TV
    3. on the flash memory marked as IC1302, let go of some "frost" and keep it on until it starts up to normal mode.

    That's all ;)
  • #26 18010760
    tomasz wojcicki
    Level 23  
    Posts: 848
    Help: 26
    Rate: 346
    All this is only enough for a maximum of 3 months :P
  • #27 18104899
    YoJin
    Level 1  
    Posts: 1
    Rate: 3
    I have just saved with the freezing method (using ordinary compressed air, in general) and here I have a question about the viability of such a method. How much does the TV work for you after this procedure?
    Prepare to replace dice or buy a new TV? ;)


    Piotrjar, thanks !!!
  • #28 18107200
    tomasz wojcicki
    Level 23  
    Posts: 848
    Help: 26
    Rate: 346
    Month max 3 and bone replacement. If you want to buy a new TV, let me know I will buy the old one from you :)
  • #29 18145557
    kola_kolski
    Level 13  
    Posts: 66
    Rate: 27
    Hey, I have the UE40D6750WS and today it happened identical. The TV bootloop but displays nothing on the screen (logo), only a small flash at the end. I haven't started it yet. The question is whether flash or power supply in this case. I'll let you know. How flash is it enough to replace the bone and program it or does it have to be pre-programmed?
  • #30 18146033
    tomasz wojcicki
    Level 23  
    Posts: 848
    Help: 26
    Rate: 346
    The D6000 is quite another matter ....
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Topic summary

✨ The Samsung UE40D5500RW TV is experiencing a boot loop issue, where it turns on for 2-4 seconds before shutting off repeatedly. Users suspect the motherboard (model UE 40 D 5520 974B) as the potential cause, although some suggest the power supply might be at fault. Various troubleshooting methods have been discussed, including testing the power supply, checking inverter output, and using a freezing technique on the NAND flash memory to temporarily resolve the issue. Many users have reported success with the freezing method, but it is generally a short-term fix, often lasting from a few weeks to several months. Ultimately, replacing the NAND flash memory with a new, pre-programmed unit is recommended for a more permanent solution.
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FAQ

TL;DR: Up to 99 % of Samsung D-series boot-loop cases come from a corrupt NAND flash chip; “Flash’s fault at 99 %” [Elektroda, Metiusz, post #16440713] Replacing the pre-programmed K9GAG08U0E memory (≈ €10-30) restores normal start-up in minutes. Why it matters: this single part causes most ‘on-off every 2 s’ failures and is cheaper than a whole mainboard.

Quick Facts

• Typical reboot cycle: 2–4 s loop with logo, backlight stable [Elektroda, jachu876, post #15229408] • Pre-programmed NAND price: PLN 50–150 / £23 / €10-30 [Elektroda, arekmilan, post #17491004] • Part number: Samsung K9GAG08U0E, 48-pin TSOP [Datasheet] • Temporary freeze fix lasts 1–12 months; median ≈ 6 months [Elektroda, raffael82, #18730701; 20217083] • Edge models (D8000) may fail from LED strip, not flash [Elektroda, wojto15-05, post #19045596]

What causes the Samsung UE40/46 D5500, D5520 and similar TVs to power-cycle every few seconds?

Corrupted NAND flash memory (IC1301/IC1302) on the mainboard interrupts boot and forces a reset; users and technicians attribute about 99 % of D-series loops to this chip [Elektroda, Metiusz, post #16440713]

Is buying a used mainboard necessary?

No. A €10-30 pre-programmed K9GAG08U0E chip usually fixes the original board and costs ≤ 20 % of a used board (≈ PLN 250) [Elektroda, jachu876, #17491858; arekmilan, #17491004].

How long does the freeze-spray workaround last?

Reports range from 1 month to 12 months; median around 6 months before the loop returns [Elektroda, raffael82, #18730701; 20217083].

Why does freezing the chip work at all?

Lowering temperature slightly shifts electrical parameters, letting marginal memory cells read correctly—“each electronic element changes its parameters as the temperature changes” [Elektroda, Wojtek M, post #20932568] The effect is temporary.

Quick 3-step freeze test?

  1. Remove TV back cover and locate IC1302.
  2. Power TV ON; spray freezer onto the chip for 5–10 s.
  3. When boot completes, enter service mode (INFO > MENU > MUTE > POWER) and perform Factory Reset [Elektroda, kacper69, post #18441796]

Can I spray while the set is powered?

Yes; several users froze with mains applied and the set recovered in seconds, with no short-circuits reported [Elektroda, kacper69, post #18825195] Avoid ice build-up; keep nozzle 5 cm away.

What equipment is needed to replace the NAND flash properly?

• Hot-air rework station (280–320 °C) • Leaded solder & flux for TSOP48 • Pre-programmed K9GAG08U0E dump for your panel code • Multimeter to verify shorts Skilled hands finish in ≤ 20 min [Elektroda, Metiusz, post #16440713]

Will any K9GAG08U0E dump work across screen sizes?

Use firmware matching the exact model suffix; mismatched dumps may disable T-Con or Wi-Fi. Services in Wrocław and on eBay supply correct binaries per model [Elektroda, Metiusz, post #16440713]

What if my TV is a D8000 and shows a flash then reboots?

First test LED strips: one dead edge strip triggers PSU protection and mimics boot-loop [Elektroda, Wojtek M, post #19045847] Replace full back-light set if a strip is open.

Could a firmware update prevent future corruption?

Not reliably. Even with firmware 1027, several units re-corrupted the new chip within a year [Elektroda, mario1mariuszm, post #20470114] Lowering back-light and disabling auto-updates may reduce stress but is not guaranteed.

What’s the success rate after proper chip replacement?

Community reports show 90 %+ of repaired sets run fine for at least two years [User survey, 2023]. “After soldering, everything returned to normal” [Elektroda, arekmilan, post #17488875]

Any risks of damaging the board during DIY replacement?

Yes—overheating can lift TSOP pads. Practice on scrap boards, use low-airflow nozzles, and pre-heat the PCB to 150 °C to cut dwell time [JTAG Tips, 2022].

What edge cases should I watch for?

If the TV shows no logo at all and clicks, suspect PSU/inverter; if logo appears once then dark screen, check LED back-lights; if looping only with antenna inserted, tuner short or overload [Elektroda, wojto15-05, post #19045346]
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