SABA S4015R firmware lookup, serial number, boot loop and initialization issue

User question

Tv is stuck on initialization in progress model is LED40TD1050E(T) main board inside says L14080057-00A00796 560 mA C400X14-E1-C(G1) main board also says TP.SIS231.PT851

Artificial Intelligence Response

Direct answer to the question

Your TV is most likely stuck because the firmware or nonvolatile configuration data in the SPI flash memory is corrupted, not because of the LCD panel itself.

For your exact hardware:

• TV model: LED40TD1050E(T)
• Main board: TP.SIS231.PT851
• Panel code: C400X14-E1-C(G1)

the most probable repair path is:

1. Use the exact matching firmware for this board + panel combination.
2. Try USB recovery first with a FAT32 flash drive.
3. If USB recovery does not start, reprogram or replace the SPI flash chip directly.

Key points:

• Do not use random TP.SIS231.PT851 firmware just because the board number matches.
• The panel code matters; wrong firmware can produce no picture, inverted image, bad colors, no backlight control, or dead remote response.
• If the TV shows “initialization in progress” repeatedly or stays there permanently, that usually means the boot process starts but cannot finish.

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Detailed problem analysis

This symptom is typical of a TV that can still execute its early bootloader, but cannot complete loading the rest of the software environment.

1. What the symptom means technically

When a TV displays:

• logo,
• “initialization in progress,”
• then freezes or loops,

it usually means:

• the standby supply is present,
• the main SoC starts,
• the display path is alive enough to show OSD text,
• but the TV cannot finish reading or validating firmware/configuration data.

That points strongly to one of these faults:

Most likely faults

• Corrupted SPI flash contents
• Corrupted NVRAM / user data / panel configuration
• Interrupted or failed previous update
• Aging or failing SPI flash chip such as a 25Q64 type device

Less likely but possible faults

• Unstable 3.3 V / 1.2 V / 1.5 V regulators on the main board
• Bad electrolytic capacitors causing brownout during boot
• Faulty crystal/clock around the main processor
• Shorted or unstable panel-side supply causing the software to hang during panel init

Because your TV can already draw the message on screen, the failure is more consistent with software/flash corruption than with a dead T-con or dead panel.

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2. Why exact firmware matching is critical

On boards like TP.SIS231.PT851, the firmware often contains or expects:

• panel timing data,
• LVDS mapping,
• backlight control parameters,
• remote-control table,
• tuner region settings,
• EEPROM defaults.

So even if another firmware boots on the same board family, it may still cause:

• upside-down image,
• white screen,
• wrong resolution,
• no response to remote,
• endless reboot,
• wrong standby behavior.

For your case, the safe match is:

• TP.SIS231.PT851
• C400X14-E1-C(G1)
• LED40TD1050E(T)

Ideally, firmware should also match the serial-number-specific production variant if available.

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3. Why USB recovery is the first repair step

Reports for this board family and even this model family indicate that recovery is often done from USB with a .bin firmware file.

That makes sense because the bootloader may still be intact enough to:

• detect USB,
• read a recovery file,
• rewrite the main flash contents,
• reboot into working firmware.

This is the least invasive method and should always be attempted before chip removal.

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4. Recommended fault tree

Use this logic:

Case A — TV reacts to USB recovery

If the front LED changes behavior after inserting a prepared USB stick and reconnecting power, then:

• bootloader is probably alive,
• flash rewrite is possible,
• your problem is almost certainly firmware-related.

Case B — TV ignores USB completely

If there is no LED activity change, no prolonged boot delay, and no recovery attempt, then:

• file may be wrong,
• filename may be wrong,
• USB may be incompatible,
• bootloader may be corrupted,
• SPI flash may be too damaged to read properly.

In that case, direct chip programming becomes the next serious step.

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5. Basic hardware architecture involved

Without overcommitting to a specific SoC variant, this class of board typically includes:

• main TV processor / scaler SoC,
• external SPI flash for firmware,
• RAM,
• power regulation stages,
• panel LVDS output,
• tuner and audio section.

The practical service implication is simple:

• if the firmware area is corrupted, the TV boots partially,
• if the SPI flash device itself is failing, reflashing may work only temporarily,
• if power rails are unstable, reflashing will not solve the root cause.

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Current information and trends

Based on the repair information reflected in the sample online answers for this exact board family:

• TP.SIS231.PT851 boards are commonly repaired by USB firmware recovery first.
• For stuck-at-initialization faults, technicians frequently suspect the SPI flash chip, often a 25Q64-class device.
• A successful USB method generally involves:
  • FAT32 USB
  • correct .bin file in the root directory
  • TV unplugged first
  • insert USB
  • reconnect mains
  • observe slow or rhythmic standby LED blinking during rewrite
• If that fails, the standard workshop solution is:
  • dump/read the SPI flash,
  • reprogram with correct image,
  • replace the flash chip if verification fails or corruption returns.

A current practical trend in board-level TV repair is that technicians no longer guess using “close enough” firmware. They now try to match:

• model,
• main board,
• panel code,
• sometimes remote and region variant.

That is especially important on integrated low-cost TV chassis.

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Supporting explanations and details

1. What you should do first

Before any flashing:

• Unplug TV from mains for 5 to 10 minutes
• Disconnect all HDMI, antenna, USB devices
• Try powering on again with nothing connected

This is not likely to fix a true firmware corruption, but it eliminates peripheral lockups.

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2. USB recovery procedure

Use this as your first real repair attempt.

USB preparation

• Use a small USB stick, preferably 2 GB to 16 GB
• Format it as FAT32
• Use MBR partitioning if possible
• Put only the firmware file on the USB root
• No folders
• No extra files if possible

Recovery sequence

1. Unplug the TV from mains.
2. Insert the prepared USB stick into the TV.
3. Wait 20–30 seconds.
4. Plug the TV back into mains.
5. Watch the front LED carefully.

Expected behavior

A good recovery attempt often shows:

• slow blinking first,
• then faster blinking or longer processing delay,
• then reboot after several minutes.

Important

• Do not remove power during update.
• Wait at least 10 minutes, even if nothing obvious appears on screen.
• If it finishes and boots, do a factory reset from the menu afterward.

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3. If automatic USB recovery does not start

Try these variations:

• another USB stick,
• smaller-capacity USB stick,
• different USB port,
• rename exactly as specified by the firmware package instructions,
• hold the physical power button on the TV while plugging power back in.

I would not recommend inventing filenames from other models. Similar sets may use different names, but that does not mean they apply to yours.

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4. Where the real uncertainty is

The main uncertainty is not the diagnosis.
The main uncertainty is the exact firmware file identity.

That means:

• the fault is very probably firmware/flash-related,
• but the success of repair depends on obtaining the correct image.

The best firmware source is usually:

• official support / after-sales database using the TV serial number,
• or a trusted service archive with the same model, board, and panel.

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5. If USB recovery fails completely

Then proceed as if the SPI flash is corrupted or failing.

Typical workshop method

• Identify the 8-pin SPI flash chip on the main board
• It is often near the main processor and may be marked as a 25Q64 family device
• Read it using a programmer such as a CH341A
• Save the original dump first
• Erase, program, verify
• Reinstall or test in circuit

Strong recommendation

If you are not already experienced with board rework:

• use a technician,
• because in-circuit clip programming is often unreliable,
• and accidental damage to pads or wrong-voltage programming is common.

When to replace the flash chip

Replace the SPI flash if:

• programming verify fails,
• contents corrupt again after a short time,
• chip reads inconsistently,
• TV only works briefly after reflash.

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6. Electrical checks worth doing

If you have a multimeter, check these before blaming firmware alone:

• 5 V standby present and stable
• Main supply rail after power-on, often 12 V
• Local regulators on the main board:
  • 3.3 V
  • 1.8 V
  • 1.2 V / 1.1 V depending on design

If any rail is low, pulsing, or collapsing during boot, the firmware may not be the only problem.

A board with unstable regulators can corrupt flash contents again even after a successful rewrite.

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7. Practical interpretation of your exact case

Given your exact data:

• LED40TD1050E(T)
• TP.SIS231.PT851
• C400X14-E1-C(G1)

the most defensible engineering conclusion is:

• This is a known-type software/flash boot fault
• USB recovery is the correct first action
• SPI flash reprogramming is the correct second action
• The panel itself is unlikely to be the root cause

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Ethical and legal aspects

• Firmware files are often copyrighted service materials; use legitimate service sources when possible.
• Avoid downloading random binaries from untrusted sites because they may be:
  • wrong,
  • incomplete,
  • modified,
  • malware-packed if distributed in archives.
• Opening the TV exposes you to hazardous mains voltage, especially around the power supply capacitor area.
• If you are not trained for live-power measurements, do not probe the primary side of the power supply.

Safety takes priority over saving the board.

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Practical guidelines

Best repair sequence

1. Confirm exact rear-label model
   • LED40TD1050E(T)
2. Confirm board
   • TP.SIS231.PT851
3. Confirm panel
   • C400X14-E1-C(G1)
4. Get exact firmware
5. Try USB recovery
6. If no recovery, check power rails
7. Program SPI flash directly
8. Replace SPI flash if unstable

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Best practices

• Photograph the board before any work
• Record all chip markings
• Back up original flash contents before erasing
• Use anti-static precautions
• Use only known-good USB media
• After repair, run the TV for several hours to verify stability

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Common mistakes to avoid

• Flashing by board number only
• Ignoring panel code
• Using NTFS/exFAT USB
• Interrupting power during flashing
• Programming flash without first saving original contents
• Assuming a successful write means the flash chip is healthy

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Possible disclaimers or additional notes

• I cannot guarantee the exact firmware filename from the information provided alone.
• Some sample answers mention filenames used on similar sets; those should be treated as examples only, not confirmed files for your TV.
• The exact chip may be W25Q64 or an equivalent compatible SPI flash device, but you should verify the package marking physically.
• A minority of cases that look like firmware faults are actually caused by:
  • failing DC-DC converters,
  • RAM faults,
  • or bad solder joints around the main processor.

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Suggestions for further research

If you want to continue efficiently, the next useful items are:

• a clear photo of the whole main board
• a close-up photo of the 8-pin SPI flash chip marking
• the rear sticker with full model and serial number
• what exactly the TV does:
  • freeze permanently,
  • reboot loop,
  • LED blinking pattern,
  • response to remote or buttons

With those details, one can narrow down:

• likely firmware family,
• likely flash chip type,
• whether USB recovery should work,
• whether direct programming is unavoidable.

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Brief summary

Your TV is very likely suffering from firmware/SPI flash corruption on the TP.SIS231.PT851 main board.

The correct repair order is:

• first: obtain firmware that matches model + board + panel
• second: try FAT32 USB recovery
• third: if USB does not start, read/program or replace the SPI flash chip

If you want, I can help you with the next step in a service-style format:

1. identifying the likely SPI flash chip on your board,
2. checking which voltages to measure, or
3. preparing a safe USB recovery attempt checklist.