Recent Posts

11

TG-16/TE/TurboDuo Discussion / Re: Game of the Month: November 2025 - Fantasy Zone

« Last post by Naniyue on November 19, 2025, 10:33:40 PM »

I only had the Tengen NES version as a kid.   Not my favorite game, mostly because of the timer based powerups.

12

TG-16/TE/TurboDuo Discussion / Re: Game of the Month: November 2025 - Fantasy Zone

« Last post by Alexei on November 19, 2025, 12:54:23 PM »

As a kid, I only ever played Fantasy Zone on Game Gear. I'll play it tonight!

13

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Alexei on November 19, 2025, 10:40:43 AM »

Thanks a lot, Keith. I'll keep that in mind.

I still haven't figured out how to fix the CDROM2 with that strange sound I showed in the previous video, so I'm leaving that job for another time. I'm very happy because I've managed to save a different drive; it's the same work I'm already used to doing with the Mega-CD 1. But to save this other drive, I had to repair a contact on the flex cable that was slowly breaking without me noticing 



Yesterday I bought several "cheap" Japanese games (well, nothing is cheap these days), but I won't receive them for another 10-14 days. For now, I only have a couple of CD-R copies that seems to work perfectly, but only if I burn them with CloneCD.

The combination of Plextor (bought in late 2000 or 2001, it was a wonderful burner) and ImgBurn = LOAD ERROR!

Plextor + CloneCD = VICTORY!

In my free time, I'll continue investigating the first unit I started this thread about, but I'm no longer in a hurry to fix it. Having a working CD-ROM2 drive is going to be bad for my wallet, there are too many precious games on it! I'm very excited because when I was young I didn't have a PC Engine and now it's almost like discovering a new console as good as the Mega Drive and Super Nintendo.

If I ever manage to repair the first drive, you'll be the first to know. Thanks for all the valuable information; this forum is pure gold! 

14

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Keith Courage on November 18, 2025, 12:26:12 AM »

Sorry, I've been peoccupied with Car repair lately and just now got a chnace to listen to your video.

I can say that Ive never heard that from one of these drives before.

I have however heard loud static in between loading of games when testing an actual game disc. The culprit for that was a broken resister found near the 1 Screw that holds the main board in place inside the case(near the center of the board). I'd start taking a look at resisters to see if any are bad or cracked.

15

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Alexei on November 17, 2025, 11:42:10 AM »

Good afternoon, gentlemen. I've taken some measurements; I'm not sure if they're good values, but it seems IC 103 is damaged.

CDROM2 Board 3184-1-72931843-1

IC202 4560

1 2.25v
2 2.25v
3 2.25v
4 GND

5 2.25v
6 2.25v
7 2.25v
8 7.8v


IC203 4558

1 3.93v      
2 3.92v
3 3.93v
4 GND

5 3.92v
6 3.93v
7 3.92v
8 7.81v



IC204 4558

1 4.3v
2 4.31v   
3 4.27v      
4 GND

5 4.27v
6 4.31v
7 4.31v
8 7.83V


IC103 4558

I'm having a hard time taking measurements on this IC.

Voltage on pin 1 is not stable; it fluctuates between 3.5V and 4.5V.
I'm not getting readings on pins 2 and 3.

4 GND

5 4.27V
6 4.27V
7 6V
8 8.57V


EDIT:

Near IC103, which I suspect is faulty, I found capacitor C138 shorted. Outside the screenshot area, C137 is also shorted.



These two capacitors are located directly below one of the BA chips.

16

Chit-Chat / Re: Your Megami Tensei experiences?

« Last post by Mathius on November 16, 2025, 06:38:43 PM »

My first experience was Persona 3 on PS2. I really dug the music and setting, but really REALLY hate procedural generation in most of its grotesque forms so never made it through to the end.

Funnily enough, the 2nd SMT game on the Famicom has some sort of an additional soundchip (I think) in the cart which, to my ears, outputs some surprisingly Engine-esque music. Definitely worth a listen.

17

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Alexei on November 16, 2025, 03:56:11 PM »

Hi everyone, I haven't had time to investigate further, but I've noticed two points that are connected, which I don't think they should be.

Is this a possible short circuit, or is it normal operation?



EDIT:

I disconnected the brown wire.

On the main board, the points where the brown and red wires connect are no longer making contact.

On the top mini-board, there is still contact between the red and brown wires.

Sorry if my explanation is confusing; I'm not used to giving technical explanations in English, haha.

EDIT 2:

No luck, the problem persists. Apparently, the last time I opened the unit, a short circuit occurred due to a speck of metal residue, which is why the red and brown wires shorted out, but this is unrelated to the sound problem with this unit.

18

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Alexei on November 15, 2025, 06:38:06 PM »

I still haven't solved the problem. Things I've tried:

Adjusting the potentiometers only improves/worsens CD reading, but the problematic noise is always there; the potentiometers don't affect it.

I cleaned and inspected the entire board with a microscope. I didn't see any corrosion or damaged traces. I can't rule out the possibility of a loose trace, but in this initial inspection, I wasn't able to find anything wrong.

I replaced the headphone jack and the power barrel jack because they weren't in good condition. This obviously didn't solve anything, but it was necessary.

I reflowed all the chips on the board. No change; the problem persists.

For me, it's time to follow the advice of those who know this hardware and share my experience in case it helps someone in the future. I read about some integrated circuits you call op amp 4558; I don't know if they're related, but I'll take measurements and post them tomorrow.

Thank you all for your time!

19

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Alexei on November 15, 2025, 06:54:51 AM »

Do audio tracks ever stop playing prematurely?

Crackling can be the sign of a lens requiring adjustment.

Are you testing with a real audio disc or a CDR?

Does this happen when using the CD drive by itself(not in the docking station) as well as docked?

This could also be an under power problem. What power supply are you using?

Thanks for the help. I'm using original audio CDs and have tried two lenses with the exact same result. The music plays correctly, but there's always background noise/interference. I've captured a video to show the problem:

I'm using a 9V, 2.5A TRIAD power supply.

The noise is also present when using CDROM2 independently, both through the main jack and the rear line out.

EDIT:
I've checked the power supply. CDROM2 is receiving 9.36V, and the measurements at its voltage regulator are 8.5V input (approximately; I forgot to write it down) and 5.1V output.

20

TG/PCE Repair/Mod Discussion / Re: CD-ROM2 with stactic/cracking noise while playing audio

« Last post by Keith Courage on November 15, 2025, 04:43:18 AM »

Do audio tracks ever stop playing prematurely?

Crackling can be the sign of a lens requiring adjustment.

Are you testing with a real audio disc or a CDR?

Does this happen when using the CD drive by itself(not in the docking station) as well as docked?

This could also be an under power problem. What power supply are you using?