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

jachu876 150900 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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  • #61 20479184
    szach11
    Level 12  
    Posts: 78
    Help: 1
    Rate: 16
    >>20469699
    Please remind me the name of this bone. do i need to program before installation?
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  • #62 20674049
    jimimisiek
    Level 2  
    Posts: 2

    Hi everyone, I have a UE46D5500RW from new and this morning it freaked out. So far, flawless. Entirely. The Smart TV logo appears, then the HDMI source, and so it loops. It does not respond to the remote control (but you can see that the signal from the remote control reaches the TV). It also does not respond to the buttons on the TV. It can only be disabled with a plugin. After reconnecting to the power supply, it turns itself on and does the loop described above.

    I have the original remote for it and the glass base that has not been used - it is still sealed.

    Does someone want to fix it? To buy? It can be picked up in Poznań, at the Przyjaźni estate.

    Added after 1 [minutes]:

    Hi everyone, I have a UE46D5500RW from new and this morning it freaked out. So far, flawless. Entirely. The Smart TV logo appears, then the HDMI source, and so it loops. It does not respond to the remote control (but you can see that the signal from the remote control reaches the TV). It also does not respond to the buttons on the TV. It can only be disabled with a plugin. After reconnecting to the power supply, it turns itself on and does the loop described above.

    I have the original remote for it and the glass base that has not been used - it is still sealed.

    Does someone want to fix it? To buy? It can be picked up in Poznań, at the Przyjaźni estate.
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  • #63 20932526
    pospiechfilip161
    Level 4  
    Posts: 3
    >>17740879
    I have a question: why does it start working thanks to freezing? How it`s working? I`m asking because I`m shocked how this miracle works.
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  • #64 20932555
    Wojtek M
    Level 39  
    Posts: 3690
    Help: 520
    Rate: 1121
    pospiechfilip161 wrote:
    I have a question: why does it start working thanks to freezing? How it`s working? I`m asking because I`m shocked how this miracle works.
    It may work for a short time, it was written in previous entries, the NAND memory must be replaced with a NEW and well-programmed one.
  • #65 20932559
    pospiechfilip161
    Level 4  
    Posts: 3

    But how does it work? I know it needs to be replaced, but why does cooling help and not, for example, heating? I want to know how a system works that suddenly works after cooling?
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  • #66 20932568
    Wojtek M
    Level 39  
    Posts: 3690
    Help: 520
    Rate: 1121
    Each electronic element changes its parameters as the temperature changes.
  • #67 21643642
    miniaturszczyk
    Level 12  
    Posts: 27
    Rate: 1
    >>20932559 .
    Today I found these tips and successfully got my Samsung :) up and running.
    The reason for the cooling tripping could be "cold solders". Once the circuit has shrunk, the missing connections return for a while.
    If the TV stops working again, I will solder this circuit without cooling and let you know if it helped.
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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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