Solved Screen not powering on

Joined
Jan 9, 2020
Messages
27
Likes
10
I'm working on a G-Wii and just got to wiring up the screen, and it doesn't turn on at all. I'm using the screen that used to be sold on the BitBuilt store (datasheet attached just in case). For running it off of 5v, I followed some instructions from an older thread involving removing L111 and simply attaching 5v to the capacitor next to it, so the red wire is attached to 5v. I assume the wires attached for composite are not the current problem. Any ideas on why the screen does not power on?
PXL_20210614_161733444.jpg
PXL_20210614_161804117.jpg
 

Attachments

Gman

RTFDS
Staff member
.
.
.
.
.
Joined
Feb 25, 2016
Messages
1,435
Likes
2,873
The screen won't "turn on" unless there is also a video signal from the wii. Test the wii on another TV to see if maybe its the wii that is not turning on.
 
Joined
Jan 9, 2020
Messages
27
Likes
10
Got it, thanks. I just tested it that way and the Wii is indeed not turning on, so now I just have to figure out why (and hope that it's not a botched trim).
 

Stitches

2 and a Half Dollarydoos
Staff member
.
.
Joined
Feb 5, 2017
Messages
3,776
Likes
2,982
Location
Banana Bender Land, Australia
Portables
6
If you take some clear photos of both sides of the trim and post them here, we might be able to help with that.
 
Joined
Jan 9, 2020
Messages
27
Likes
10
Here's both sides. I've already noticed a couple things that could be a problem, like one of the SCW/SDW wires broke off. For some reason, 1.8v also isn't outputting 1.8v, and the fan no longer spins, so those could possibly be related as well. Thanks for the help.
PXL_20210616_004419718.jpg
PXL_20210616_004552288.jpg
 

Stitches

2 and a Half Dollarydoos
Staff member
.
.
Joined
Feb 5, 2017
Messages
3,776
Likes
2,982
Location
Banana Bender Land, Australia
Portables
6
Your USB wires are also not intertwined. USB is a differential pair, the wires must be intertwined like a helix to equalise interference. Also you seem to have a lot of shiny gunk around your U10 via. I'd clean that up, it's a potential short.

And then there's the elephant in the room:
1623808036262.png

This giant 1.8v straight to ground short. That'll be the main offender right there.
 
Joined
Jan 9, 2020
Messages
27
Likes
10
Thanks. After working on the problems you mentioned, I tested it again, and I still got nothing. However, I did discover the fan problem was due to some sloppy soldering on the PMS 5v rail (it wound up shorted to the fan wires because of the way I tried to fit everything in), so I still have to redo the fan and 5v wiring. Otherwise, here's some updated pictures just in case something other than that is still wrong.
PXL_20210617_204742691.jpg
PXL_20210617_204917303.jpg
 

Stitches

2 and a Half Dollarydoos
Staff member
.
.
Joined
Feb 5, 2017
Messages
3,776
Likes
2,982
Location
Banana Bender Land, Australia
Portables
6
All those strings of thermal paste probably aren't helping matters either, they can cause shorts as well, I'd clean all that up with some isopropyl alcohol. I'd also use some isopropyl alcohol and a soft bristled toothbrush to clean off all that leftover flux around your soldering, I've had cases where a few metal particles stuck in the flux caused shorts. The only other thing I can suggest is running a sharp blade between the 1.8v linear reg pads to ensure there aren't any hair thin solder wisps still causing shorts
 
Joined
Jan 9, 2020
Messages
27
Likes
10
Sorry I've been so long coming back to this, I was pretty busy for a while. After following your advice, rewiring the fan and 5V, and realizing that I also had video wired wrong the whole time, the Wii boots and the screen works! It seems like it's being a bit slow in booting, so that may be a problem for another time, but for now I'm calling this a victory. Thanks again for the help.
PXL_20210805_010705033.jpg
 
Top