Mod/repair help. White screen after a slew of mods...

[goombakid]

Hi all!

So, I did a bunch of mods for a friend on a PCE Duo-R. It included region mod (via "Obey" chip) with a dual color LED for region/power indication, Component out (using tg16pcemods.com component board), and composite, S-video, and RGB video out through a Nintendo Multi-out connector (scavenged from a non-properly working Super Famicom).

Everything worked just fine when I gave the console back to my friend back in May, 2015. He has used it every so often since then up until PRGE in October.

He had a booth that he was gonna show off the console, but never got around to getting it actually set up. He just brought it back home and that was that.

The following month, he powered it on to play, and all that happened was a white screen. The LEDs do come on. This white screen happens with or without a HuCard in the slot, not even the Super CD splash screen.

I just opened it up tonight, and nothing seems out of place. I've checked the region mod (my first suspicion) but all the wires seem to be on there properly.

The +5V needed to power the mod boards (region, component, and the RGB amp) are all powered via one of the 7805s, pretty much piggy backed. When testing after finalizing the install, I ran the console straight for 4 hrs, alternating using US and Japanese Hucards and my Turbo Everdrive v1.1, even a couple of discs, with no hiccups whatsoever.

It doesn't look like anything's shorting. I had to cut a bit off the CD drive frame to get the Mulit-out to fit properly, but I didn't think that affected the drive's performance.

Any help is really appreciated on this. I'll have to look further into it, but any and all insight is welcomed.

[Keith Courage]

Double check the region mod. By that, I mean disconnect it and wire things up as if the region mod was not there to see if you at least get function back again. I've come across faulty chip based region mods before that have had these symptoms. Including no CD rom boot up screen.

The only other thing I could think of that could cause a white screen with or without a hu card inserted would be a bad chip on the board or possibly a bad trace. Usually the Hu6280 chip.

Maybe (thesteve) can chime in if there is something I could be missing here.

[goombakid]

There was a trace repair done prior to me getting the console for the mods. There was a red wire coming off the Hu6280 to one of the pins there. I'll double check that and also try it without the region mod. Any more help welcomed.

Also, thanks for chiming in, Keith Courage. Appreciate it!

[goombakid]

Small bump. Calling TheSteve for input. I haven't tried removing the region mod yet. Still waiting for my tendinitis flare up to subside (work doesn't help at all).

Also, is there any way for the mods to condense the stickies in this sub forum? Maybe just one sticky that has all those links in it?

[thesteve]

ok whitescreen is likely a no boot
whitescreen no bios on duo after region mod is normally a short between data pins or a trace broke when connecting wires
the wire from the 6280 to slot tells me it had an open trace between them which would cause whitescreen in most cases solved by the wire