PC Engine Core Grafx Overheat?

[LaC]

I have a Core Grafx that appears to lock up due to over heating.
If I play Soldier Blade for like 15 minutes and then go and try to play Air Zonk, Air Zonk will lock up with garbled graphics almost immediately.  Sometimes the music will continue.
If I then let the system cool down for a bit, Air Zonk will play fine. Eventually locking up much later.
I had problems with other systems before (sega cd, 32x), and a full cap replacement fixed it.

Is this at all common?
I was wondering if there are any other things I should be checking/replacing that could be causing this? I was thinking maybe the 7805 regulator too.

[schweaty]

Core Grafx aren't commonly known to overheat or need cap replacements.  Have you checked the voltages at the regulator? 

[Tatsujin]

do you use an original PSU? or what rate does it have?

but even if the 7805 overheats a bit, it still should regulate the 5V voltage just fine.

maybe something completely different? like dirty contacts, or some cold/broken solder points in the inside, which can cause such phenomenons when the system warms up a bit etc. how do other games react?

[LaC]

do you use an original PSU? or what rate does it have?

but even if the 7805 overheats a bit, it still should regulate the 5V voltage just fine.

maybe something completely different? like dirty contacts, or some cold/broken solder points in the inside, which can cause such phenomenons when the system warms up a bit etc. how do other games react?

I'll check the voltage on the 7805. And maybe just replace it to see what happens.
I've had other games lock up too.
I use the sega genesis model1 power supply.

I should probably look for cold/broken solder joints around the heat sink? Nothing else feels hot to the touch. The heat sink and power switch sure do get decently hot though.

[Bernie]

Id go with an original power supply first.

[thesteve]

mine has an issue with 1 game card when hot
but its when the game is hot, not the system
game fine other systems
system fine other games

[LaC]

Id go with an original power supply first.

Don't have one. I thought the voltage from a gen model1 was well within tolerance...
Is there a known issue with them?

[Bernie]

I'm not totally positive, but its a cheap way to tell.  Retro game cave sells em.

[LaC]

It does have an RGB amp installed. Very similar to the one talked about here -> http://www.assemblergames.com/forums/showthread.php?45483-What-s-currently-the-best-RGB-mod-for-the-PC-Engine

There are power decoupling caps (0.1uf+220uf) in parallel on VCC->gnd on the amp itself. And 0.1uf+200uf on the 6260, pin 41 and pin 43 both, to ground.

mine has an issue with 1 game card when hot
but its when the game is hot, not the system
game fine other systems
system fine other games

[LaC]

Ok so I don't think this is a heat thing. I just turned it on cold and it locked up with the same type of graphic distortions in Air Zonk. 
Also more info... This is using an Everdrive. (This is not my system, trying to fix it for someone).
I turned it off, and reinserted the Everdrive, and now it worked up until the end of Level 1, then crash.

It does have an RGB amp installed. Very similar to the one talked about here -> http://www.assemblergames.com/forums/showthread.php?45483-What-s-currently-the-best-RGB-mod-for-the-PC-Engine

There are power decoupling caps (0.1uf+220uf) in parallel on VCC->gnd on the amp itself. And 0.1uf+200uf on the 6260, pin 41 and pin 43 both, to ground.

mine has an issue with 1 game card when hot
but its when the game is hot, not the system
game fine other systems
system fine other games

[Tatsujin]

do you use an original PSU? or what rate does it have?

but even if the 7805 overheats a bit, it still should regulate the 5V voltage just fine.

maybe something completely different? like dirty contacts, or some cold/broken solder points in the inside, which can cause such phenomenons when the system warms up a bit etc. how do other games react?

I'll check the voltage on the 7805. And maybe just replace it to see what happens.
I've had other games lock up too.
I use the sega genesis model1 power supply.

I should probably look for cold/broken solder joints around the heat sink? Nothing else feels hot to the touch. The heat sink and power switch sure do get decently hot though.

I was more thinking of cold solder joints around the data lines/conducting paths etc. which might crash a game when not making properly contacts.

[LaC]

Are you saying I should get in there with a magnifying glass and check every joint? sounds like fun. though, not sure if i'd be able to tell good from bad at that scale.

do you use an original PSU? or what rate does it have?

but even if the 7805 overheats a bit, it still should regulate the 5V voltage just fine.

maybe something completely different? like dirty contacts, or some cold/broken solder points in the inside, which can cause such phenomenons when the system warms up a bit etc. how do other games react?

I'll check the voltage on the 7805. And maybe just replace it to see what happens.
I've had other games lock up too.
I use the sega genesis model1 power supply.

I should probably look for cold/broken solder joints around the heat sink? Nothing else feels hot to the touch. The heat sink and power switch sure do get decently hot though.

I was more thinking of cold solder joints around the data lines/conducting paths etc. which might crash a game when not making properly contacts.

[schweaty]

take out the everdrive.  what happens when you use real PCE games?  it could just be a bad everdrive or corrupted ROMs

[OGHUGO]

This sounds very familiar..
Hmm....

[FriendofSonic]

LOL, what a twisted triangle. We have the original seller and now the buyer checking in in these last two posts. I'm not intending on taking sides, but I'll be curious to find out what the solution is. For the record, my TED never crashed in my Turbo Grafx, but I also never tested the Air Zonk ROM so I don't know *shrugs*

I *think* the romset I downloaded was indicated to be Everdrive friendly-- not that means anything at the end of the day since people make mistakes and a bad rom may not have been discovered.

I am a layman but would a bad ROM cause garbled graphics (and still run)? In my experience,  ROMs immediately lock up and never really run. I'm also not sure why he would get inconsistent results with running the ROM. Could still point to a hardware failure with the TED I guess,  but that still brings me back to the point of how I didn't have issue with my TG.