Czy wolisz polską wersję strony elektroda?
Nie, dziękuję Przekieruj mnie tamTv só fica na logo ,não abre nada
‐ A TV that powers-up, shows only the manufacturer’s logo and never reaches the normal user interface is almost always failing in the boot sequence.
‐ In more than 80 % of the cases the root cause is corrupted or incomplete firmware stored in the eMMC / NAND flash on the main board; the remainder are true hardware faults on the same board or, less frequently, an unstable power-supply rail.
‐ Start with a full power-cycle and a key-combination factory reset; if the set is a Telefunken TE50550B44U2PE the service combination most often used is “VOL– on the TV while plugging in AC.”
‐ If it still stops at the logo, load the correct firmware (latest known build: 1.64.1.0) on a FAT-32 USB stick, trigger emergency USB-upgrade and let the set rewrite the internal flash.
‐ When USB recovery does not start, the eMMC is probably unreadable and the main board must be reflashed on a programmer or replaced.
Boot sequence in modern “smart” TVs
• Logical corruption of the /system or /vendor partition (interrupted upgrade, sudden power loss).
• Excessive bad blocks in eMMC; the bootloader may still be intact (so the logo appears) but higher partitions are unreadable.
• Brown-out on the 3 V3 or 1 V1 rail caused by a failing DC-DC converter feeding the SoC or memory.
• Rarely, peripheral buses hung by an external device (USB-stick, HDMI-CEC loop) keep the kernel from mounting /dev/mmcblk0.
Hardware checklist
– Measure PSU board rails first (5 V, 12 V, BL-ON, etc.). If they are noisy or collapse when the logo appears, repair PSU before touching firmware.
– If rails are OK, attach a 3 V3 UART to the main board header (115 200 baud). Continuous “EXT4-fs error…” or “cannot mount /system” messages confirm flash-corruption.
– If UART is silent after the logo, the SoC may enter a watchdog loop → suspect RAM or SoC itself.
• Community forums (Elektroda 29-Dec-2024 thread) report the most recent Telefunken TE50550B44U2PE firmware as v1.64.1.0. Users successfully recovered sets by renaming the file to “upgrade.bin” and forcing USB-boot.
• Manufacturers increasingly sign partitions with RSA; mismatched firmware stops at logo with no error text. Always use the exact panel/MB code printed on the white sticker of the main board.
• Replacement main boards for Vestel chassis 17MB130 / 17MB211 are widely sold; cost is often lower than eMMC rework in low-labour-cost regions.
• Chip-level repairs: technicians now routinely swap BGA169 eMMC (Samsung KLM8G* or Hynix H26M series) with pre-programmed dumps; success rate >90 %.
Emergency USB upgrade sequence for Vestel-based Telefunken (generic):
If the LED never changes, bootloader did not find the file → wrong name, wrong model, or unreadable eMMC.
‐ Firmware files are protected by copyright; use only images released by the vendor or explicitly allowed by licence.
‐ Distributing paid-for service dumps without permission infringes IP law.
‐ Always disconnect AC before removing the rear cover; exposed primary PSU caps carry up to 320 VDC.
‐ Privacy: resetting or reflashing removes user data; inform customers beforehand.
• Keep a bench PSU with current limit to power only the main board; this isolates PSU failures.
• Label USB sticks with model/firmware to avoid cross-flashing.
• After recovery, disable “Auto-update” until the customer has a stable internet link or UPS to prevent mid-update outages.
• For persistent eMMC failures, fit an industrial-grade eMMC (SLC-mode parts have 10× endurance).
• Maintain ESD discipline—SoC pins are fine-pitch BGA; latent damage appears as random boot loops weeks later.
‐ Some early production runs of TE50550B44U2PE used a different T-Con/Panel combo; flashing the wrong “panel table” can give sound-only symptom after logo.
‐ If the board uses secure-boot fuses and the eMMC is replaced blank, you must programme not only partitions but also RPMB keys—requires brand-specific tools.
‐ Market availability of OEM boards fluctuates; lead times >6 weeks are common.
• Study UART logs from multiple faulty boards to build a signature database of common failures.
• Investigate substituting eMMC with SD-card in adapter for fast swap-out in service centres.
• Follow development of open-source “OpenLGTV”-style projects for Vestel to allow safe dual-firmware partitions.
• Monitor manufacturer bulletins for patched bootloaders that add CRC checks to reduce silent corruption.
A TV frozen on the logo is almost invariably trapped in the bootloader-to-OS hand-off. The first repair tier is a hard power-cycle and button-combo factory reset. The decisive tier is an emergency USB firmware rewrite using the exact image for the board/panel (Telefunken TE50550B44U2PE → v1.64.1.0). If this procedure does not start or complete, the eMMC flash or associated power rails are defective; replacement or specialist re-flashing on a programmer is required, or the whole main board can be swapped. Observing safety procedures and legal constraints, this systematic approach resolves the great majority of “logo-freeze” cases.
