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• First try the built-in (“master”) codes: 0000, 1234, 1122, 2580, 8899, 1147, 9999.
• If they fail, open the Service (Factory) Menu with MENU → 1 1 4 7 or INPUT/SOURCE → 2 5 8 0, then execute Factory / Shipping Init – this erases every user password.
• If the set will not accept any code and the Service Menu cannot be reached, re-flash or edit the non-volatile memory (24Cxx EEPROM / 25Qxx flash) with a clean dump that matches exactly TP.MS3663S.PA671 and your panel resolution.
• Hardware operations (shorting the EEPROM or in-circuit programming with CH341A) work, but are last-resort and require proper ESD handling and a verified backup of the original dump.
Architecture
• TP.MS3663S.PA671 is a “universal” MStar-based TV mainboard.
• User settings—including child lock, hotel lock and service passwords—are kept in a small I²C EEPROM (often 24C08/16) or in the user region of the 8-pin SPI NOR flash (W25Q32/64).
Password types
• Menu / Child-lock (asks for 4-digit code on entering Setup).
• Hotel-mode (locks source, volume, setup).
• Service-menu lock (rare; normally not password-protected).
Software-only recovery (recommended order)
a) Master passwords – already listed above.
b) Hidden reset in ordinary menu – Settings → Reset / Restore Default (may still ask for code).
c) Service-menu reset – two most reliable key sequences:
• TV ON → press MENU then 1147 quickly; or
• TV ON → press INPUT/SOURCE then 2 5 8 0.
Once inside, navigate to Option / Factory / Shipping Init and confirm. The set reboots cleared.
d) USB firmware re-flash – if menus are locked or crashed.
• Get the exact firmware (.bin dump) that states “TP.MS3663S.PA671 +
• Rename as instructed by the package (commonly LAMV56.bin or MS3663.bin).
• Format a ≤8 GB USB to FAT32, copy only that file.
• AC-unplug TV → insert USB → keep TV power button pressed → apply AC. LED will blink; wait until it stops and the TV restarts, then pull USB.
Hardware-level recovery (expert)
a) EEPROM pin-short method – with AC removed, short pins 3–6 (WP–SCL) of the 24Cxx, keep shorted while powering ON for ~10 s, then release. Works on about 60 % of MS3663 boards, clears only the user-data page.
b) Direct SPI flash programming
• Identify the flash (e.g., Winbond W25Q64F).
• Clip or desolder; read and save a full backup.
• Option 1 – erase whole chip and write clean dump.
• Option 2 – erase only user-data sector (usually last 64 kB).
Tools: CH341A, TL866-II; software: AsProgrammer, NeoProgrammer.
Verification / test
• After any reset, TV should start in first-time-installation wizard.
• If picture is inverted, colours wrong, or backlight dead, you flashed a dump for a different panel; re-flash the correct file.
• Sites actively maintaining dumps in 2023-24: receiverpro.net, ciklon.org, elektronika-pt, elektroda, Remont-AUD forums.
• Newer firmware packages integrate panel ID auto-detection; older ones do not—hence the panel-matching requirement remains critical.
• Service remotes that transmit the factory code sequence in one keypress are becoming common on Aliexpress (“Mstar Service Remote V2”).
• MStar loader checks for a specific file name in the USB root; if a second file is present, flashing aborts.
• EEPROM short only works because at power-on the MCU reads corrupt data, falls back to compiled defaults and then rewrites the 24Cxx with blank values.
• Master passwords exist because many manufacturers forgot to remove the ODM’s default.
• Only reset devices you legally own. Hotel-mode tampering in a rented device may breach contract.
• Firmware dumps contain licensed code (HDCP keys, panel EDID, sometimes Netflix keys); publishing them may violate copyright or DRM laws.
• Always back up the original flash before writing.
• Use an isolation transformer or at least discharge the PFC capacitor before touching the PSU side.
• Label the panel resolution on the mainboard sticker for future reference.
• Shorting or flashing can permanently brick the board if power fails mid-process.
• A minority of TP.MS3663S.PA671 revisions store passwords in secure OTP; in that case only full flash replacement works.
• Analyse the user-data block with a hex editor to learn the structure (helpful for batch repairs).
• Explore creating a composite “universal” dump with auto-panel detection tables.
• Look into open-source “OpenMStarTool” project for safer regional editing instead of full flashing.
Start with universal codes; if unsuccessful, enter the Service Menu with MENU-1147 or INPUT-2580 and execute Factory Reset. When the menu is unreachable, re-flash the board with a dump that exactly matches TP.MS3663S.PA671 and the LCD panel. Hardware methods (EEPROM short or SPI reprogramming) are reliable fall-backs but demand proper tools and ESD precautions. Always keep a backup of the original firmware and observe safety rules; done correctly, the forgotten password is completely removed and the set returns to out-of-box state.
