Grundig 46 VLE 631 BH Firmware Needed: Similar Issue to Grundig TV 43 VLE 6621 BP Topic

Hello everyone, I am new on this forum because I meet an issue really similar to the one described in topic3722443 / "
Grundig TV 43 VLE 6621 BP looking for firmware" (I can not put the link because I am new on the forum).

As soon as I plug the TV, the standby blue LED is on, but I can not switch it on with the control panel button...
So I assume the NAND flash has to be rewritten.

Could anybody provide me the suitable firmware software for this Grundig smart TV ?



Thanks in advance

Please try it because it is TP Chassis

Thanks for your answer.
Unfortunately, it does not work.
I tried with several USB sticks, even a small 1GB one.
The LED from USB key is not blinking, and the standby blue light is just staying on (not blinking at all).
I tried both USB inputs.
I tried pressing P then plugging the power cable and wait 5 s.
I also tried pressing P, plugging and pressing power on button.

Am I wrong somewhere? Any idea?

It seems bootloader is dead... Would it be possible to reprogram it directly on the board?
I could try this option because I own a small CH341A SPI programming board which helped me to revive a broken Samsung laptop...

mainboard code is VSF190R-6?

try to rewrite the spiflash IC107/IC108 25Q16 with this bin file, then retry the usb upgrade procedure
if it doesn't work, most probably nand IC101 is damaged

Yes it is VSF190R-6 .

I unsoldered IC107/IC108 then read it then compared dump with mboot.bin : no difference on the first 1206832 bytes.

Just for testing, I padded mboot.bin with 0 to match with rom size et then write back to the SPI with flashrom :
$ cp -p IC107108/mboot.bin new.bin
$ dd if=/dev/zero bs=1 count=890320 seek=1206832 of=new.bin
$ flashrom --programmer ch341a_spi -w new.bin
Found Winbond flash chip "W25Q16.V" (2048 kB, SPI) on ch341a_spi.
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... VERIFIED.

Then I soldered it... But I get same behaviour: blue LED is on and not flashing. :(

I retrieved TP service manual (grundig_chassis_tp_sm_v2.pdf).
On page 52, it says:
If any problem occurs in the flash integrated circuit, the chassis will not function
because the software in the chassis does not start. As soon as the chassis is
energized, LED located on the front panel will start flashing. This means that main IC
has read and started the software. IF LED is constantly illuminated but not flashing,
and the chassis is not turned on even though it is energized, this means either
software was not read due to a problem in flash IC or it could not be started due to a
problem in main IC...

So it seems nand IC101 is damaged ?
Then, if I understand well, the only way to get progress would be to retrieve a mstar vga-usb debug board and ISP TOOL program in order to interact with the board ?
Or replace IC101 nand ?
Or replace the mainboard ?

Best regards

who can help me too