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• LG supplies the official firmware (“software”) for the 29-inch LED TV model 29LN4500 through its regional support portals (e.g. https://www.lg.com/ ► Support).
• Download the latest .EPK package that matches your exact suffix (29LN4500-xx) and region, copy it to a USB stick in a folder named LG_DTV, insert it into the TV, and follow the on-screen prompt to upgrade.
• If the set no longer boots far enough to display menus, a forced USB update or, in worst cases, direct SPI-/eMMC-flash programming on main board EAX65283604 is required.
Key points
– Use only the firmware that corresponds to your chassis/region to avoid “bricking” the TV.
– Format the USB device as FAT32 and keep the file structure exactly as required.
– For deep corruption, service-level tools (RT809H/TL866II, service remote, JTAG/UART) or replacing the whole main board are the safe routes.
Hardware overview
• Main board: EAX65283604 (LA31R or LD31S chassis variants). Contains the LG Silicon-X SoC, DDR, and a 3.3 V SPI flash (often Winbond 25Q32/64) or eMMC for firmware storage.
• Typical symptoms of software corruption:
– endless LG logo loop / stuck logo
– power LED on, but black screen and no OSD
– reboots after a few seconds, loss of channel memory, or IR remote ignored
Root causes
• Interrupted OTA/USB update, brown-out while writing flash, ageing of the NAND/eMMC, or wrong firmware previously loaded.
• Because bootloaders and panel EDID data reside in the same device, corruption blocks the entire boot chain.
Firmware hierarchy
If stage 2 or 3 is damaged, the TV hangs; if only stage 4 is wrong (e.g. swapped panel), the TV powers but shows artefacts.
Diagnostic interfaces
• UART header (3.3 V) on main board with 115 200 bps gives text console → quickly shows whether bootloader is alive.
• Service remote key sequences: “IN-STOP” resets NVRAM; “IN-START” shows hidden menu; “ADJ-ENTER” forces USB upgrade.
• LG no longer releases new feature updates for 2013 LN-series, but still hosts the final bug-fix firmware (v04.22.xx) on its servers (checked Q2 2024).
• Independent repair forums circulate full flash dumps (.bin) for board EAX65283604—handy when the LG package cannot be parsed because of a dead bootloader.
• Emerging trend: using low-cost CH341A or RT809H programmers with clip adapters to re-flash SOIC-8 SPI ICs in-circuit, avoiding hot-air removal.
USB update procedure (standard)
Software_File.epk from LG support. .epk inside. Forced update (set does not reach OSD)
Direct flash re-programming (expert)
Partial brick rescue with UART
• Connect USB-to-TTL dongle, open PuTTY 115 200-8-N-1.
• If prompt appears, use commands update 1 /mnt/usb/sda/lg_dtv/Software_File.epk or run usb_upgrade to trigger upgrade manually.
• LG firmware is copyright LG Electronics and distributed under EULA; sharing full dumps publicly may breach license.
• Region-locked firmware could contain DRM/CI+ keys; improper handling risks violating broadcast-content agreements.
• Perform board-level re-flash with ESD protection; mains isolation required—TV SMPS exposes lethal voltages.
Implementation best practices
– Verify part-number suffix (e.g. 29LN4500-TB / 29LN4500-TI) before downloading.
– Keep TV on a UPS during update to prevent new corruption.
– Always back up original SPI contents prior to overwrite.
Potential challenges & mitigation
– USB not detected → try smaller ≤8 GB stick, re-format, different port.
– Update starts then fails at 8 % → suspicious bad blocks in eMMC; consider replacing chip.
Testing / verification
• After update, perform factory reset (Menu → Option → Factory Reset).
• Run panel self-test: hold OK (remote) + OK (TV) 5 s → internal patterns.
• If bootloader itself is damaged, no consumer-level USB procedure will work—hardware re-flash or main-board swap is mandatory.
• Service-remote codes vary slightly by region; consult the 29LN4500 Service Manual Rev 0.3 for exact sequences.
• Some replacement boards ship with generic panel data and may need “Tool Option → EDID Write” to match your panel.
• Investigate open-source “OpenLGTV” projects that document LG SoC registers and allow custom firmware, but note stability and legal issues.
• Monitor repair forums (Badcaps.net, Elektrotanya) for updated full-flash images and cross-flashing experiences.
• Study modern eMMC-in-package failure modes—useful when servicing post-2014 WebOS sets that rely solely on eMMC.
To restore or update “SOFT” on an LG 29LN4500 you:
.EPK from LG support for your exact model suffix.