FAQ
TL;DR: USB recovery works for many SENCOR SLE3210M4 sets. Expect the LED to blink and, as one user noted, "after about a minute it will start flashing quickly." Use that cue to power-cycle and remove the USB. [Elektroda, Passivepl, post #16669116]
Why it matters: This FAQ helps owners fix boot loops (logo hang, red/green LED) and complete a safe USB firmware restore at home.
Quick Facts
- Affected hardware: SENCOR SLE3210M4 with TP.SIS231.P93 mainboard. [Elektroda, Passivepl, post #16653604]
- Typical firmware payload size: Approx. 8–10 MB. [Elektroda, Passivepl, post #16656025]
- USB formatting: Use FAT32 for update media. [Elektroda, kassans, post #16656133]
- Progress cue: slow red/green blink, then fast blink after about a minute. [Elektroda, Passivepl, post #16669116]
- Fallback path: reprogram 25Q64 flash if USB update fails. [Elektroda, z0diaC, post #16954628]
How do I fix a SENCOR SLE3210M4 that hangs on the logo and blinks red/green?
Use the USB recovery. 1) Format a USB to FAT32 and copy the recovery file. 2) With TV unplugged, insert USB, then power on via remote. 3) Wait for slow red/green blinking to turn fast, then power off, remove USB, and start normally. "Wait a few minutes" for the blink change. [Elektroda, borg77, post #16661119]
What USB format and size should I use for the firmware update?
Format the stick as FAT32. Small drives work fine; one successful case used a 512 MB USB stick. Avoid NTFS. "Format the flash drive to fat32 and then try." [Elektroda, kassans, post #16656133]
How long does the update take and what LEDs should I see?
Expect slow red/green blinking during loading. After about one minute, the LED blinks faster. That indicates flashing completed. Then power off, remove the USB, and boot normally. "After about a minute it will start flashing quickly." [Elektroda, Passivepl, post #16669116]
Do I need to hold any buttons during startup for USB flashing?
No. Insert the USB while the TV is unplugged. Plug in, then turn on with the remote and press nothing else. The TV reads the USB automatically and shows the LED sequence. [Elektroda, borg77, post #16661119]
My TV stays on a solid red LED with the USB inserted. What should I check?
Verify panel (matrix) compatibility and board details. Mismatched matrix types can block updates and cause no USB activity. Open the back and confirm exact identifiers before retrying with the correct file. "Not a word was about the type of matrix." [Elektroda, borg77, post #16668154]
What’s the typical firmware file size for this model?
Community-shared firmware packages for this board are about 8–10 MB. A small USB is sufficient. This helps spot bad downloads that deviate wildly from that size. [Elektroda, Passivepl, post #16656025]
The TV keeps rebooting in a loop even after the update. What next?
Document full hardware details before further action. Note the mainboard (TP.SIS231.P93), power supply, and especially the matrix model. Share these when seeking help, as mismatches can cause persistent loops. [Elektroda, borg77, post #16661542]
Can I recover the TV by programming the 25Q64 chip directly?
Yes. Users restored operation by flashing the 25Q64 memory with the working image when USB attempts failed. This approach requires a programmer and steady hands but can revive a bricked set. [Elektroda, z0diaC, post #16954628]
What is the TP.SIS231.P93 board in my SENCOR?
It is the mainboard code used in SLE3210M4 and related models. Match this code before applying any firmware or board swaps. Owners reported boot issues and successful fixes referencing this exact code. [Elektroda, Passivepl, post #16653604]
What is the 25Q64 component?
It is the onboard serial flash memory that stores the TV’s firmware. Some users reprogrammed this chip to restore boot when USB updates did not take. Treat it as the last-resort path. [Elektroda, z0diaC, post #16954628]
Do I need to power-cycle at a specific moment during the update?
Yes. Wait until the LED changes from slow to fast blinking, indicating the write completed. Then power off, remove the USB, and start the TV normally. Powering off too early risks corruption. [Elektroda, Passivepl, post #16669116]
Will replacing the mainboard cause the image to flip upside down?
Yes, after swapping boards, some sets showed a 180° rotated image. Applying SISEU23X8M software corrected orientation and restored normal viewing. This is a known post-replacement quirk. [Elektroda, arson18, post #17312571]
What steps confirm the USB file actually loaded?
Watch the LED behavior. Slow alternating red/green means reading. Fast blinking signals completion. No on-screen image appears during the process, which is normal. Then perform the final power cycle. [Elektroda, borg77, post #16661119]
Can the TV start the update without me pressing any buttons?
Yes. With the USB inserted and power applied, it begins reading automatically. Turn on with the remote, then leave it. Do not press other keys. [Elektroda, borg77, post #16661119]
Is it normal to see no picture during the USB update?
Yes. Users reported no image while the LED indicated progress. Rely on the blink pattern, then complete the power cycle when fast blinking begins. This avoids interrupting the write. [Elektroda, Passivepl, post #16661369]
What if my USB was formatted NTFS earlier and the update failed?
Reformat the same stick to FAT32 and retry the procedure. Community feedback shows FAT32 as the accepted format for the loader on this board. This change alone resolved failed attempts. [Elektroda, kassans, post #16656133]
However, if I have problems, I know where to look for help!
