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[Console Repair/Mod Center / PCE GT repair help (super hard!) needed please o_o]

So my friend gave me his childhood PCE GT to fix.  Lots of sentimental value.  and man is it busted.  At some point the 5v rail I believe shorted and it fried the controller board IC.  ordered a new controller board, but I don't know what else it took with it.

I get a yellow and reddish screen, split in 2, with noise lines in the middle (attached).



- Fully recapped
- Fully cleaned in Ultrasonic and manually with 99.9% IPA
- No audio (I can hear speaker hum, and volume works.  I'm confident audio amp output stage is OK.
- +5V rail is good (4.85v)
- +2.5v rail is good (for audio)
- 24mhz clock is good on both ASICs (followed guide from TG-16 service manual)
- H sync and V sync outputting correctly
- Backlight circuitry all tested good, 30V and 24v OK.  All oscope probes of transformer check out too.  Screen seems to be fine.

What I did in addition to above:
- swapped in full Hudson ASIC chipset from working CoreGrafx (white)
- probe (diode) tested every on the Hucard slot.  Compared with working unit, and values seem to be as expected / close (bus pins within range of each other, no obvious shorts).
- swapped in one of the VRAMs from the CoreGrafx as well

I'm at such a loss with this one...the board looks *so* clean.  anyone know of other stuff to look at?  I've poured so much time into this one it hurts.

I'd be so indebted to a helpful benefactor.  Willing to send thank you gifts!
<3

Thanks in advance!

[Console Repair/Mod Center / Schem for adding composite video to original PCE]

Hey folks,
  first time post here!  I recently acquired an RF-only PCE and I really wanted to restore the original composite functionality without an AV booster.  This wasn't as easy as I thought it would be, since schematics only exist for the RF model of the TG-16 as far as I can tell.

Well a friend of mine let me borrow his core graphics II and I reverse engineered some of the video and audio circuitry. If anyone's interested, I can draw up the schematics to share online here.

–Segasonicfan