[Android Software Development] jricgar:
Hello all,

I wrote here sometime ago about my "white lines" problems. I think I was one of the first "lucky" ones to suffer this problem. So after replacing a faulty plate with a new spare part (from http://www.projectorjunkies.com) everything was like a charm with my projector (Xiaomi 4K batman, MJJGTYDS01FM) until a few days ago. I was installing it on my new tv cabinet and after some time testing positions, moving and restarting/reconnecting it, suddenly the laser light stopped working. I supposed this time the problem isn’t related with the plate cause there isn’t any light, and the projector stays cool which I think is a signal of a not working laser source. I thought it could be related with a loose connector, a broken electronic component or something similar, so I opened it again and check absolutely everything. No luck. Apparently everything is ok.

Then I realized the projector was a bunch of hours (during my cabinet configuration and tests) connected to a pair of USB fans, using the back USB port. I did it to ensure a good air flow because I planned to keep the projector partially inside the cabinet (bottom part of it) and I was quite worried about a too high temperature on the left side (were the air flow output is located). There wasn't any problem with those fans connected and it seemed to be a great idea cause when connected to the projector they start/stop at the same time.

But... could be these usb fans the reason of the problem? Maybe connect them to the USB port could cause some corruption in the firmware?

At that point the projector turn on/off with the remote button as usual (one power press to switch off in about 20 seconds, two to switch off almost immediately, and one press to turn in on) but without any image or light.

So I decidedly to try a "recovery" procedure by pressing OK and BACK while doing a cold start. This get the projector into a worse situation. Now it doesn't responses to a one power press on the remote to turn it off, and I have to double press it when trying to switch it off. But it doesn't turn off. It just does a restart, over and over (see attached video). If I want to switch it off, I have to cut the power ("hot-unplug")

One thing to highlight is that the led indicator in front of the projector follow this sequence after starting it:

1. White fixed

2. White blinking (while fan's noise and activity decreased)

3. No light

At this point I tried to reset the device to factory firm using info included in this thread:

- Download Full rom 1.3.105 (6.0.1.724)

- Extract it to a USB drive (fat16, is there any format restriction?)

- Try to do a cold restart while pressing the remote buttons. Remember I can't switch off the projector so I cut the power when I think the projector is "about" to restart.

I did several times without success. Sometimes the projector started with a different behavior:

1. White led fixed permanently

2. No White blinking anymore

3. No fan's activity decrease

These times I waited during hours and nothing seemed to happen. Then I had to "hot-unplug" the projector.

I'm quite worried about all of these problems :(

Some suggestions or tips about what I could try to solve this??

Thanks in advance for your time and help.