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81

TG/PCE Repair/Mod Discussion / SOLVED PC Engine DUO - Push Run Button with door open/No LED/No Laser/Disc Spin

« Last post by xodaraP on March 16, 2024, 10:16:05 PM »

Hi all,
I have recently been working on a Duo that has had a lot of issues, most of which have been resolved but I am now having an issue where the console boots to a BIOS screen but always says "Press Run Button" as if the door is closed, even when the case is not on top of the console. I have seen some other threads where people have suggested testing the traces underneath the HuCard slot - I have done this and found no broken traces, I have also beeped out all traces to the ICs controlling the disc drive and have not found an issue there either

I feel like I'm finally getting to the end of the repairs for this console, but I am completely stuck as to where to go from here, I have beeped out the entire CD drive circuit using the publicly available schematics and KiCAD with the repro PCB designs on Github and have not found any more broken traces in the circuit

For those who have had this issue before, are there any specific traces that may be relating to this issue I can check and potentially replace as they might be beeping out but have damage on the line that could be causing it to read incorrectly?

Adding diagnostic information:

From what I can see there are several address lines that go through a buffer/driver at IC517 to the large custom chip that controls the disc drive. A8 through to A15 become XA8 through to XA15. Connections for these are where the through hole pins are for the cartridge slot

IC501 - Custom CD controller ASIC D91317GD
IC517 - LS244 buffer/driver
IC515 - Flash memory holding Super CD BIOS (same pins are also connected on IC514 and IC513 - same pins unless otherwise noted)
IC906 - HM6264 SRAM

IC517 - Outputs

Pin 3 -> Pin 10 IC501 -> Pin 28 IC515
Pin 5 -> Pin 16 IC501 -> Pin 26 IC515
Pin 7 -> Pin 13 IC501 -> Pin 23 IC515
Pin 9 -> Pin 8 IC501 -> Pin 3 IC515 -> Pin 31 IC513 IC514
Pin 12 -> Pin 11 IC501 -> Pin 4 IC515
Pin 14 -> Pin 12 IC501 -> Pin 25 IC515
Pin 16 -> Pin 17 IC501 -> Pin 27 IC515
Pin 18 -> Pin 9 IC501 -> Pin 29 IC515

Inputs

Pin 2 -> Pin 70 CPU
Pin 4 -> Pin 78 CPU -> Pin 25 IC906
Pin 6 -> Pin 73 CPU -> Pin 23 IC906
Pin 8 -> Pin 72 CPU -> Pin 2 IC906
Pin 11 -> Pin 69 CPU
Pin 13 -> Pin 74 CPU -> Pin 21 IC906
Pin 15 -> Pin 77 CPU -> Pin 24 IC906
Pin 17 -> Pin 71 CPU

IC518 - Outputs

Pin 14 -> Pin 31 IC515 -> Pin 5 IC501
Pin 16 -> Pin 30 IC515 -> Pin 6 IC501
Pin 18 -> Pin 2 IC515 -> Pin 7 IC501

Inputs

Pin 2 -> Pin 68 CPU
Pin 4 -> Pin 67 CPU
Pin 6 -> Pin 66 CPU

Data lines go through a similar buffer at IC520 and D0 through D8 generate XD0 through XD8 - Outputs do not go under the cart slot and were not tested at this time

Inputs

Pin 2 -> Pin 19 IC906 -> Pin 13 6270 -> Pin 56 6280 -> Pin 5 6260
Pin 3 -> Pin 18 IC906 -> Pin 14 6270 -> Pin 55 6280 -> Pin 6 6260
Pin 4 -> Pin 17 IC906 -> Pin 15 6270 -> Pin 54 6280 -> Pin 7 6260
Pin 5 -> Pin 16 IC906 -> Pin 16 6270 -> Pin 53 6280 -> Pin 8 6260
Pin 6 -> Pin 15 IC906 -> Pin 17 6270 -> Pin 52 6280 -> Pin 9 6260
Pin 7 -> Pin 13 IC906 -> Pin 19 6270 -> Pin 51 6280 -> Pin 10 6260
Pin 8 -> Pin 12 IC906 -> Pin 20 6270 -> Pin 50 6280 -> Pin 11 6260
Pin 9 -> Pin 11 IC906 -> Pin 21 6270 -> Pin 49 6280 -> Pin 12 6260

/WR and /RD lines

These both run under the cartridge slot

/RD

IC515 Pin 24 -> Pin 4 IC519 -> Pin 22 IC906 -> Pin 3 6270 -> Pin 78 6260 -> Pin 62 6280

/WR

IC519 Pin 1 -> IC906 Pin 27 -> Pin 2 6270 -> Pin 77 6260 -> Pin 63 6280

82

TG/PCE Repair/Mod Discussion / Re: Solved: PC Engine Duo - CD Drive Spins Automatically (Backwards)

« Last post by xodaraP on March 16, 2024, 10:11:29 PM »

Not yet sadly about to create another thread for the next issue I have that is proving just as difficult. But I wanted to keep this information here because I have seen a few cases where people have this issue and it is a damaged 5V rail and this was the same issue, but caused by the 9V rail

83

TG-16/TE/TurboDuo Discussion / Re: What Turbo game are you currently playing?

« Last post by lukester 3.0 on March 16, 2024, 05:51:11 PM »

got through Rabio Lepus Special finally. had to use a credit though, the last 2 boss-rush levels are extremely sneaky (4 bosses...then 5 bosses)! lot of missle management and the hitbox is a bit large
great graphics and color usage too

84

TG-16/TE/TurboDuo Discussion / Re: Game of the Month: March 2024 - Jim Power

« Last post by majors on March 14, 2024, 09:27:05 PM »

I get this and Slime World confused at times.

Jim Power is 100% a "Euro" game, looks like it was ripped out of an Amiga. The game backgrounds look stellar but that jump mechanic (glitch?) is annoying. I would say the hit box is too big, but I already mentioned it's a European game. Music rocks. Only 5 levels as far as I know. Invincibility cheat was the only way I could see any level past 1

I wonder why the publisher decided to port this game (and the other Micro World releases) out of all the possible computer games that were out there? Games like Baby Jo, Davis Cup Tennis, Kickboxing, Builderland and Slime, all must have been super cheap to acquire.

85

TG/PCE Repair/Mod Discussion / Re: PC Engine GT - Controller Board

« Last post by tawy on March 14, 2024, 03:55:14 AM »

still available.

86

Turbo/PCE Game/Tool Development / Re: Your mods/updates wish list:

« Last post by lukester 3.0 on March 13, 2024, 10:22:46 PM »

SF II CE with the added moves/features from hyper fighting
it's already a nice port but would be lovely to have included. only new graphics would have to be the title screen?

also...sound/color fix for new zealand story. great level design and gameplay but everything else...

87

Turbo/PCE Game/Tool Development / Your mods/updates wish list:

« Last post by _joshuaTurbo on March 13, 2024, 06:24:13 PM »

For instance, there's been a number of awesome quality of life updates made to some games that were just a few weeks off from being properly finished. Games like updated Energy or sound fixes in games like Order of the Griffon!

Also seeing more work being done on fixing some of the crazy stuff Working Designs did to Exile 2 and Cosmic Fantasy 2 to make those games more playable even!  I'm not talking about just translating games either, however, getting fan-translations for the hundreds of incredible Japanese RPGs is such important work!!

So what other games are on your list of bugs or issues you'd like to see some crafty devs fix?

The short list (to be updated after I think more about it or get some great ideas from this thread!)

Parallax scrolling fixes to:
Ninja Gaiden HuCard
Ys III CD-Rom2


What would you add?

88

TG/PCE Repair/Mod Discussion / Re: Pc engine duo doesnt power on

« Last post by mouth78 on March 13, 2024, 05:59:13 PM »

Hi Kevin. I haven't tested another lens...

I think Len doesn't focus, go up too fast and go down same, three times and then stop.

PD. Sorry, I thought I was answered in the same post.

PD.2 Finaly Pc engine DUO works again. YEESSS. One year fixing the console....
One little track was broken...
I don't know if I have to calibrate the pots ...loads Darius fast. I have to test carefully...

89

TG/PCE Repair/Mod Discussion / Re: Pc engine duo doesnt power on

« Last post by mouth78 on March 13, 2024, 05:36:30 PM »

Hi Kevin. I haven't tested another lens...

90

TG/PCE Repair/Mod Discussion / Re: Pc engine duo doesnt power on

« Last post by Keith Courage on March 13, 2024, 06:29:22 AM »

The lens moving to the center and moving up and down is good, but the disc should then spin up. Have you tested another lens after you repaired the bad trace?