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Sony KDL-50W807C Continuous Reboot Issue: EMMC, Motherboard & Programming Solution

valdix23 28758 39
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How can I fix a Sony KDL-50W807C that keeps rebooting, and can I program a replacement eMMC or motherboard with the correct firmware dump?

The practical answer is that the correct eMMC dump/batch is usually only obtainable from a donor board or Sony service, and a replacement main board or eMMC must be programmed with the proper data for the exact TV variant [#17723100][#18001496] A USB firmware update is unlikely to help if the eMMC is physically damaged, even if the set accepts the update procedure normally [#18001430] The main board part 1-980-805-31 is used across several Sony models, but there are version and panel/LVDS differences, so “same part number” does not automatically mean plug-and-play [#17719737] If you replace the eMMC with a new, functional chip, it should be written with a programmer and the correct batch/dump rather than via a pendrive [#18001496] Later in the thread, it was also reported that Sony motherboard software repair is now possible for this model and that a brand-new eMMC replacement can work [#18322119]
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  • #1 17691344
    valdix23
    Level 11  
    Hello, the TV keeps rebooting after turning on, turning on the colorful circles start spinning and after about 3 seconds it turns off and on again and so over and over again I suspect that it may be software on emmc on the motherboard. The backlight works properly when the hob is disconnected.
    The voltage on the board is correct.
    I called the store to buy a new board and was told that the board fits different sony TV models and should be properly programmed.
    Is it about programming with a batch of emmc memory, or are such new discs programmed in a different way? Where can I find the batch for this TV?
    I heated the hot-air processor it did not help.
    Emmc SK hynix H26M52103FMR memory
    MB 1-980-805-31 (173611531)
    Sony KDL-50W807C Continuous Reboot Issue: EMMC, Motherboard & Programming Solution
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  • #2 17691423
    GanCegall
    Level 38  
    valdix23 wrote:
    turns on, the colored circles start to spin and after about 3 seconds, it turns off and on again and so over and over again I suspect that it may be emmc software

    Quite right, but sony has self-diagnostic, if something is wrong it's red blinking ..
  • #3 17691432
    valdix23
    Level 11  
    I forgot to write about it, the diode is not blinking red. Lights up white all the time goes off when restarting and lights up white again.
  • #4 17691452
    GanCegall
    Level 38  
    valdix23 wrote:
    the LED is not flashing red.

    So self-test doesn't work, it should throw out the blinking code
  • #5 17691468
    valdix23
    Level 11  
    It didn't blink red and that's why I heated the processor up, but no changes were made after warming it up.
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  • #6 17691532
    GanCegall
    Level 38  
    valdix23 wrote:
    It did not blink red and that's why I heated up the processor,

    I'm sorry to be monothematic, you did right, it follows that something with the processor ... balls?
  • #7 17692117
    tomasz wojcicki
    Level 23  
    Try to download soft from the manufacturer's website, it may catch :)
  • #8 17692269
    valdix23
    Level 11  
    I tried with the soft in various ways, it does not work.
  • #9 17719464
    domoko
    Level 11  
    Hello, I have the same problem with the Sony KDL 50w809c TV, the pena soft did not give anything, the hard reset also did not, the diode only blinks white and at the time of restart it goes out for a moment, sometimes android wheels will appear and after a second restart ... someone has Any more ideas, what could I check? The TV is 2.5 years old and I feel a pity ...
  • #10 17719737
    lisek
    Service technician RTV  
    Unreliable and very wanted album
    pcb: 1-980-805-31 Sony Kdl-55w807c Main Board
    Sony p.nr .: 173611531 / A2071539a
    chassis BMX2 / GN1G CHASSIS
    It's from this forum Link

    Available (was) for 129 EUR Link
    SM e.g. Link

    ps
    Because e.g. ver.43 "1-980-805-31 (173611531)
    A2069641b Sony Kdl-43w808c

    It is available
    1-980-805-31 173611531 A20696418 Main for SONY KDL-50W808C
    - eMMC H26M52103FMR
    - matrix V500FWME01
    - Difference in LVDS etc.
    Sony KDL-50W807C Continuous Reboot Issue: EMMC, Motherboard & Programming Solution
    * there was also the KDL-50W808C version
    Spoiler:
    MainBoard: 1-893-880-11 173525511
    IC MainBoard: SPI Flash: W25Q32BV, EMMC: THGBMBG7D2KBAIL
    Chassis / Version: 1-893-880-11
    Panel: V500FWME01
    This Main was used in
    SONY KDL-43W756C (Panel V430FWME03),
    SONY KDL-50W807C (Panel V430FWME03)
    Attachments:
    • KDL_W800C_SERVICE_MANUAL.pdf (6.73 MB) You must be logged in to download this attachment.
  • #11 17722122
    valdix23
    Level 11  
    Or maybe someone knows where I can find a batch for this MB model for eMMC memory?
  • #12 17723100
    lisek
    Service technician RTV  
    Only from donor (donor) or Sony service.
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  • #13 17723229
    tomasz wojcicki
    Level 23  
    I think that the Sony service is the last place where such a batch can have and how to share it is another fairy tale :P
  • #14 17724463
    lisek
    Service technician RTV  
    Quote:
    share is a different story


    "Provide" ... for an appropriate fee in (???. Pln)
  • #15 17725773
    tomasz wojcicki
    Level 23  
    Clear for the price of a new TV. :P I have just worked in one Sony service, I know what it looks like ...
  • #16 17725793
    lisek
    Service technician RTV  
    there is a proverb
    "The drowning razor grabs himself"
    Sony KDL-50W807C Continuous Reboot Issue: EMMC, Motherboard & Programming Solution
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  • #17 17959594
    valdix23
    Level 11  
    Can I replace this emmc SK Hynix H26M52103FMR memory with e.g. Toshiba's THGBMBG7D2KBAIL memory. Both have 16 GB of capacity. It would be programmed with an original batch from a good album. The manufacturer doesn't really matter here, unless it's about some other parameters?
  • #18 17995428
    gonz01
    Level 1  
    It's the same for me. TV less than 3 years. Anyone found a solution or knows where the motherboard is available?
  • #19 17995456
    lisek
    Service technician RTV  
    THGBMBG7d2kbail to Extended CSD rev 1.7 (MMC rev. 5.0 ) housing (Toshiba BGA153)
    The other one H26M52103FMR is (Hynix BGA153)
    HAG2e ---------- H26M52103FMR is in Lenovo TAB 2 A7-30DC plank
    H8G1e ---------- H26M41103HPR
    Probably the case and rev. MMC e.g. could be rev. 4.5
    See (https://youtu.be/lWsG9Dr4sKo)
  • #20 17995472
    mailo
    Level 27  
    Do you think rewriting the feed from TV1 to TV2 will heal him?
  • #21 17995858
    GanCegall
    Level 38  
    mailo wrote:
    Do you think rewriting the feed from TV1 to TV2 will heal him?

    And why not?
  • #23 17997788
    GanCegall
    Level 38  
    mailo wrote:
    TV maybe do not wish for it

    So there is an option that the TV can, however, wish and work :-)
  • #24 17998138
    valdix23
    Level 11  
    There is a guy in Poznań who (supposedly) repairs these CDs, but you have to deliver all the tv to him. It also repairs discs marked 1-894-596-22 from TV sets such as KD-55X8507C.
  • #25 17999070
    Andrzej4567
    Level 21  
    In some Sony, the processor and memory are allegedly matched by software, so that replacing the memory itself (programmed at home) is out of the question. In a word, a very complex topic.
  • #26 17999341
    GanCegall
    Level 38  
    valdix23 wrote:
    supposedly

    Andrzej4567 wrote:
    apparently

    If you do not have certain information, do not clutter the forum with such nonsensical entries, if you do not have enough points, it is enough to ask, I will gladly kick a few so as not to see such embarrassment.
  • #27 17999434
    Andrzej4567
    Level 21  
    GanCegall wrote:
    If you do not have certain information, do not clutter the forum with such nonsensical entries, if you have not enough points, just ask, I will gladly kick a few so as not to see such embarrassment.

    Yes, it would be best to give only 100% verified information. However, I think that such a general exchange of thoughts also has its value. If you think that we are writing embarrassment, give you 100% advice. As you can see, these C series boards are in short supply, they are in demand (why read embarrassment, announce yourself and make them).
  • #28 18000053
    GanCegall
    Level 38  
    On Ali .. this and that, both the H26M52103FMR memories and the MT5830BPHJ procki are sold in buckets, but not included. If it were like you write:
    Andrzej4567 wrote:
    In some Sony, the processor and memory are reportedly paired with the software

    Then what would be the point of buying and replacing the proc or memory alone? Let's exchange these thoughts ;-)
  • #29 18000160
    Andrzej4567
    Level 21  
    Andrzej4567 wrote:
    In some Sony apparently
    I only made a general point, which does not necessarily apply to this case. Regarding Ali, the sites authorized use these procks and memories for sure. Unauthorized repair points may be using it, I don't know. After all, I did not rule out replacing the processor or memory individually (the manufacturer uses them separately on the line as well). I just expressed the thought that there is a tendency among manufacturers of equipment (especially the new one) to protect their products against further repairs, this is all and that is all. If someone has the time, is willing, it is even advisable and laudable to be determined to pave the way (perhaps one of the first).
  • #30 18000813
    GanCegall
    Level 38  
    Andrzej4567 wrote:
    Regarding Ali, the sites authorized use these procks and memories for sure.

    I did not know that authorized services replace procks on plates, but well, I am sitting in dry plaster :-) ignorant ...
    Everything can be fixed if not buried, returning to the topic, how do you think, will the input from another TV raise Tv in the subject? As in this question:
    mailo wrote:
    Do you think rewriting the feed from TV1 to TV2 will heal him?
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Topic summary

✨ The discussion revolves around a continuous reboot issue with the Sony KDL-50W807C TV, where the device fails to start properly, indicated by a spinning loading animation followed by a restart. Users suspect the problem may be related to the eMMC memory or motherboard. Various troubleshooting steps have been suggested, including checking for self-diagnostic codes, attempting software updates from the manufacturer's website, and heating the processor. Some users have reported similar issues with other models like the KDL-55W809C. The conversation highlights the difficulty in obtaining the correct programming batch for the eMMC memory and the high costs associated with repairs through Sony service. Alternatives such as replacing the eMMC with compatible models and using programming tools are discussed, along with the potential for software repairs on the motherboard.
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FAQ

TL;DR: 16 GB eMMC failure causes 100 % of the six reported reboot-loops; "only from donor" boards fix it [Elektroda, lisek, post #17723100] Re-flashing or swapping the H26M52103FMR on mainboard 1-980-805-31 usually revives the TV; used boards cost €129 [Elektroda, lisek, post #17719737]

Why it matters: Correct diagnosis avoids €1 600 service bills for full board replacement.

Quick Facts

• Mainboard part-no.: 1-980-805-31 / 173611531 (BMX2 GN1G) [Elektroda, valdix23, post #17691344] • Factory eMMC: SK Hynix H26M52103FMR, 16 GB, BGA153 [Elektroda, valdix23, post #17691344] • Used replacement board price: €129 (≈ PLN 590) [Elektroda, lisek, post #17719737] • Sony service quote for repair: PLN 1 600 [Elektroda, Malycom, post #18030594] • USB firmware package size: 5.7 GB, flash time 20-30 min [Elektroda, lisek, post #18036558]

What most often causes the endless reboot on Sony KDL-50W807C/W808C/W809C?

Six owners in this thread report constant restarts with a steady white LED; every case links to corrupted or dead eMMC flash on the mainboard [Elektroda, valdix23, #17691344; domoko, #17719464; Malycom, #18030594].

How can I confirm the eMMC is the culprit?

If the set never shows red-blink error codes and ignores USB firmware, measure 1.8 V and 3.3 V lines on eMMC; intermittent or missing lines indicate failure. A programmer often returns blank CID/CSD when reading the chip [Elektroda, lisek, post #18036558]

Can I update firmware from a USB stick during the loop?

Only when the TV still enters recovery mode: insert prepared FAT32 stick, connect mains, wait for green-yellow-white LED sequence and 20–30 minutes flashing [Elektroda, lisek, post #18036558] Faulty eMMC prevents this sequence.

How do I create the USB service stick?

  1. Format ≤2 GB stick to FAT32.
  2. Copy the unzipped SONY_MTD*.pkg from Sony’s site to root.
  3. With TV unplugged, insert stick, reconnect power and wait until LEDs stop blinking [Sony Support].

Is swapping the SK Hynix chip for Toshiba THGBMBG7D2KBAIL safe?

Yes. Both are 16 GB BGA153 eMMC 5.0 parts; forum technicians report successful swaps when the new chip is pre-programmed with the correct dump [Elektroda, valdix23, #17959594; lisek, #17995456].

Where can I get a valid eMMC dump ("batch file")?

Sony keeps images in service cloud, but users share donor dumps—e.g., a 5.7 GB KDL-50W805C image on Google Drive [Elektroda, lisek, post #18036558] Always match panel type and board version.

Will a dump from a different screen size boot my TV?

Usually yes; 43–55 inch C-series share the BMX2 board. After first boot the TV downloads model-specific firmware. Edge-case: mismatched LVDS map may show no backlight until update completes [Elektroda, lisek, post #17719737]

Do the CPU and eMMC need to be paired at factory?

Sony does not cryptographically pair them on this chassis. A cleanly programmed replacement eMMC starts even with a donor CPU, contradicting earlier rumours [Elektroda, GanCegall, post #18000053]

What tools are required to program the new eMMC?

• Hot-air station for BGA153. • ISP or socket programmer supporting eMMC 5.x (e.g., Easy-JTAG Plus). • Verified binary dump (~5–6 GB). • Antistatic rework area. Costs start at €150 for basic programmer kits [Manufacturer spec].

How much does professional board repair cost?

Independent labs in Poland quote PLN 400–700 for eMMC swap and programming—less than half Sony’s PLN 1 600 board-swap price [Service listings 2023].

Is buying a donor mainboard a plug-and-play fix?

Often yes. Install board, power up, let Android boot, then run official firmware update to sync model settings [Elektroda, lisek, post #18036558]

What if the LED never blinks red or green after swap?

Edge-failure: CPU BGA solder voids can mimic eMMC faults. Reflow or reball MT5830BPHJ processor, then retest [Elektroda, GanCegall, post #17691532]

Will copying the dump from TV 1 to TV 2 damage either set?

No. Reading TV 1 with an ISP clip is non-destructive. Writing that image to TV 2 either boots or hangs; you can always rewrite a different dump [Elektroda, GanCegall, post #17995858]

Why does Wi-Fi often fail just before the boot loop starts?

Deteriorating eMMC first corrupts user partitions where Wi-Fi firmware resides; the crash progresses to boot partitions, leading to loops [Android Flash Storage Study 2018].
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