Thank you, you are a big help

I have tried to flash the Nand chip all night but it fails in the verification. I have also tried different settings but I always get the same result. Stop during verification.
What could be the reason?

Stop during verification

Im not sure what you mean, but if it't the verify part error after that it has compleet the writing to the chip, just as one of my pictures shows, this one,, then it's still usable to place it back to see if it's works, or at least had helped to flashing the box by the usb.

If it failed due more than ten bad blocks, then it's wiser to use a new chip.
Nevertheless, this all is also posted in my topic/forum about this.

Unfortunately, I had no luck, the VU + Duo2 does not boot, but I will still try more.

Sorry to hear but as I say earlier, it only helps if it's not a hardware issue.

Maybe it's still not working because one, or more nand flash chip pins does not soldered well, the ones which are used, or maybe it's because you have used your old nand flash chip.
However, when the programming went well, then there should be no reason to think that it's caused due this.

Hello, it seems to be a hardware problem. I programmed a new Samsung chip as well as the old one and thanks to my trinocular stereomicroscope I soldered it clean but so far without success.
I have found that (the RT9018B Voltage Regulator) shows U807 on the capacitor C837 times 2.5V or 0.38V. The voltage regulator could be the problem. Could the Broadcom CPU be broken? I ordered the RT90188 Voltage Regulator but it will take a while, until it arrives.

Yeah, hard to say if it's due the dc to dc regulator, or caused due a to heavy load onto the Vout pin which is as far as I know used for the Cpu and the Network.

But I have here a Ohms overview, the VIN must be loading up to around the 1865ohms, and the VOUT 1215ohms.
Measured between a ground spot and the measurements spot.

But still, indeed it could be a defective Dc to Dc ic what is more common.

My measurements on the U807:
Gnd---Gnd------800 ohm-------x--------VOUT = 0.38V
--x---60.00K----0.65k-------1.771M------ VIN = 3.34V

The Vin voltage are fine, the Vout not, but that you already noticed.
As for the Vout ohm value, is indeed incorrect and could indeed be the U807 because it normally should deliver this voltage output when the circuit is 800ohms, but actually, you only know it for sure when you remove the U807 and to check if the ohm value goes up from the Vout, or just wait when you have the new one and see if it's helps.

I installed the RT90188 Voltage Regulator, 2.5v voltage is there on C837, but the receiver still doesn't work. But I will keep trying.

@ Giovanni001
did you fix the Vu+ duo2? I have a similar problem with white led light.

Take a look here,

https://jb8a8f8.com/support/index.php?threads/duo2-white-light-fault.372/#post-3007

TS

@Toysoft
we know this link. I have been at the stage of replacing capacitors for a month now, but I do not recommend doing it because it is very compiled and very difficult. I had to buy a lot of new tools for this repair. This is not a hobbyist job!

Did you had a chat with Johnny ? He could be the best person to talk with about your issue.

Admin

Yeah It's true you are 100% right. His help is invaluable.