Czy wolisz polską wersję strony elektroda?
Nie, dziękuję Przekieruj mnie tamPor favor, necesito firmware para esta placa base, CV72690-B42 almacenado en el logo
• There is currently no public, manufacturer-released firmware package for main-board CV72690-B42; every working image that circulates is a service (technician) dump that is protected by copyright and panel-specific.
• To un-brick a set that stops at the logo you must either
1. obtain the exact firmware that matches your TV brand + model + LCD panel code from an authorised source (OEM service, licensed data base, or a proven technician forum), or
2. replace / re-program the on-board eMMC with a verified full dump, or
3. swap the entire main-board with one taken from the same TV model.
Key points
• Firmware is not interchangeable even between boards with the same CV72690-B42 marking.
• The safest first attempt is USB-recovery; if the boot-loader is corrupted you will need ISP/JTAG/eMMC tooling.
• Legal and safety constraints prevent any reputable party from emailing you the file without proof of ownership and licence.
Hardware overview
• CV72690-B42 is a “CV-series” 4K smart-TV board (Amlogic T966/T972 or similar SoC, DDR3/DDR4, on-board eMMC, Realtek or Novatek T-CON interface).
• Panel timing, EDID and back-light parameters are stored inside the same firmware image, therefore mismatching images may boot but show black, inverted or flashing screen.
Boot-loop / logo-freeze root causes
• Corrupted / incomplete system partition (OTA interrupted, brown-out).
• Bad blocks in the eMMC (eMMC life-time wear, > 1 k P/E cycles).
• Wrong firmware previously flashed (common when boards are traded in bulk).
• Damaged u-boot/boot0 so the USB recovery routine is never reached.
Typical recovery hierarchy
Step A USB “Emergency upgrade” (works if u-boot is intact)
– FAT32 USB ≤ 8 GB.
– Correct upgrade file name (examples seen in service manuals: update.zip, MSTARUpgrade.bin, aml_upgrade_package.img – depends on OEM).
– Plug USB, press and hold local POWER or VOL- key, apply AC.
– LED fast-blinks ▸ progress bar ▸ automatic reboot.
Step B UART console (for diagnosis)
– 3-pin or 4-pin header near SoC, 115 200 N 8 1.
– Look for “Android Recovery” or “fastboot” prompt; may allow fastboot flash if enabled by OEM.
Step C ISP/JTAG or direct eMMC programming
– Requires hot-air rework or in-circuit clip + programmer (RT809H, Medusa Pro, Easy-JTAG Plus, etc.).
– Full dump size: 4 – 8 GB.
– Verify CRC before re-soldering.
Step D Board replacement
• Searches (2023-2024) in specialised forums such as elektroda.com, badcaps.net, remont-aud.net show multiple requests but no public download; technicians exchange dumps privately or sell them for ~10-15 USD.
• Many new Chinese smart-TV SoCs implement secure-boot and key-signed images, reducing the chance that an arbitrary dump will run on a later hardware revision.
• OEMs increasingly push OTA updates encrypted per serial number, so keeping a working backup before failure is considered best practice.
Why panel code matters
Panel timing (LVDS/eDP drive strength, Vcom, gamma tables) is burned into /vendor/params/panel.bin. Flashing a mismatched image can lead to seemingly dead back-light, giving the false impression that the board is still bricked.
Example naming convention
CV72690-B42_50T10-05UA_3840x2160_60Hz_V1.0_20220225.img
│ │ │ │ └─ build date
│ │ │ └─ timing table
│ │ └─ panel model (50" UHD AUO)
└─ main-board ID• Firmware binaries are intellectual property of the TV brand/OEM. Redistributing them without permission infringes copyright.
• Uploading or flashing unverified dumps can violate consumer-protection regulations if it disables region-specific functions (e.g. DVB-T2, DTMB, closed-captioning).
• Electro-static discharge and improper hot-air handling can cause personal injury or fire; follow IEC 60335 and local ESD procedures.
Gather identifiers:
– TV brand & exact retail model (e.g. “NOBLEX 55UK7900”).
– LCD panel sticker (e.g. “V650DJ4-QS5”).
– Board silkscreen and barcode.
Ask for the firmware with those three strings in technician forums; provide proof (photo) to increase the chance of receiving the correct dump.
Before flashing:
– Connect the board to an isolation transformer.
– Supply via variac-limited AC to avoid inrush trip.
– Use a UPS so power is not lost mid-flash.
After-flash checklist:
– Enter factory/service menu (commonly “Menu → 0 4 7 3 → Enter”) and set “Panel Type” to match.
– Perform NVM / EDID “write all” so colour calibration is stored.
Potential challenges & mitigation
• eMMC keeps corrupting → replace with Samsung KLM8G1GETF or Kingston EMMC04G-FS.
• USB recovery not triggered → rename file correctly, try 2-GB stick, use rear USB 2.0 port.
• No serial log → solder missing 0 Ω resistors that disconnect UART TX.
• A wrong image may permanently disable HDCP keys, breaking HDMI playback.
• Board clones exist; a “CV72690-B42” from 2020 may differ electrically from 2023 version.
• Information provided is for qualified personnel; end-users should not attempt BGA rework.
• Analyse the boot log through UART to confirm where the stall occurs (“Loading kernel ...” vs “mount: can't read superblock”).
• Study secure-boot fuse map in Amlogic T972 datasheet to see if keys are blown.
• Contribute a clean, panel-labelled dump to open firmware repositories once you succeed; helps the repair community.
Useful resources
• Elektroda thread ID 4147224 – technicians offering CV72690 data.
• Badcaps.net TV Repair section – many CV-series dumps (registration required).
• RT809H user manual – shows clip points for eMMC ISP.
A CV72690-B42 that freezes on the logo almost always needs firmware re-installation or eMMC replacement. Because the firmware is panel-specific and copyrighted, you must obtain the matching image through the OEM or specialised repair forums, then flash it via the built-in USB recovery or, if the bootloader is damaged, by direct eMMC programming. Re-flashing with an incorrect or generic file can worsen the fault, so gather the exact TV and panel identifiers before requesting the dump, verify checksums, and follow safe flashing procedures.