Here is a VAVA 4K Laser projector using ALPD 1.0 Display technology. It uses a single laser source to create all the colors needed using a combination Phosphor/Color wheel. This particular projector was sent to me by someone I talked to on Reddit. He had sent it to an authorized shop without any luck. They quoted some crazy price of $900+ saying it needed a mainboard when in reality the mainboard was fine. All they managed to do was put a screw through a cable and waste a bunch of the owners time and shipping money.

I have never worked on an ALPD projector before. I have read about them in passing but never really looked into the technology. I must admit, its pretty interesting. I was surprised to see that the ALPD 1.0 engine being used in the VAVA was patented in 2007. I guess if it works, it works.
ALPD 1.0 diagram. https://imgur.com/a/HpDZ96n

After some normal troubleshooting I came across what seemed like a weird reading on the phosphor wheel wire. Further examination led me to a seized wheel. finding the wheel was problem 2.

Thankfully the projectors owner was more than happy to assist in locating parts. VAVA and Appotronics were no help. they wanted us to send it in when I clearly had the issue in front of me.
Now I have a source for some parts for these, which is awesome!

I must admit. I am finding these laser units more interesting the more I work on them. I still prefer lamp based projectors but the solid state light engines are really getting nice. They will surpass lamps soon in all ways.

If you have a VAVA/XGIMI/Fengmi and its acting up, drop a comment. I am far from an expert at this point but I am working on it. As of this posting, I have another VAVA on the way with a different issue. Once I finish looking at/repairing/determining its dead, I will add a link to its video.

Thanks for watching!

\o/
#vava #valt002 #laserprojectorrepair #laserprojector #projectorrepair
00:00 Intro
03:20 Teardown Begins
08:25 Top Removal
09:00 Initial Examination
10:28 Mainboard removal
16:40 Punctured cable discovery
18:29 Laser module removal (5 screws)
20:00 Examine Laser Module
23:42 ALPD Source Laser Diodes
26:40 Phosphor wheel resistance test
28:07 Problem Discovered - locked phosphor wheel
30:53 Phosphor Wheel removal
38:20 New Phosphor/colorwheel arrives for install
39:00 Re-install Wheel and assemble projector for testing
1:03:03 Initial Testing
1:05:10 Fan Lock error discovered.
1:05:30 Check fans with Oscope
1:07:45 Remove fan bracket
1:09:49 Loose fan wire found
1:11:28 Test after fan repair
1:14:00 Assembly for testing
1:27:49 Full size testing/ Firmware update
1:28:40 dust spots
1:29:10 Dust cleaning
1:34:36 Reinstall bracket under phosphor wheel. Clean optics.
1:36:18 Final assembly
1:51:50 Cover install
1:58:00 Connector cover install
2:01:00 Bye