Re: PC Engine GT - No Video or Backlight
Thank you!!
WaldoX
Member
Last Activity: 01-31-2022, 09:42 AM
Joined: 10-05-2021
Location: Kalispell, MT
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Re: PC Engine GT - No Video or Backlight
Last update - it works!
When I first attempted the screen mod I used the board from Console 5, and I don't know what I did wrong, but I wasn't getting a video signal to the new screen. I ordered one of [URL="https://oshpark.com/shared_projects/SAfzq1dI/"]these boards through Osh Park[/URL], and replaced the one from Console 5 and BAM, working!Re: PC Engine GT - No Video or Backlight
Last update - it works!
When I first attempted the screenLeave a comment:
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Re: PC Engine GT - No Video or Backlight
Just wanted to update and say that my cheap chinese soldering iron has started falling apart, so I'm waiting for a new one before I attempt this screen mod.
I will update this thread though once I get around to the mod. I won't lie, this mod scares me quite a bit, it'll be some of the smallest work I've done yet. Wish me luck!
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Re: PC Engine GT - No Video or Backlight
Hello and THANK YOU for the reply! I will try my best to do these tests next time I get to work on it, but I'm honestly leaning towards just doing a modern screen mod and bypassing that old backlight power circuit. I just wish I knew how to verify that the system is generating a video signal.... any thoughts on that?
This picture seems to show that region, is that good enough?
Actually, I've already ordered the screen mod kit (I'm impulsive and impatient), so I'll be trying it either way,...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
Thank you for taking the time to post all of that! It definitely reinforces the idea that I keep making mistakes because of my own ignorance! I will study this in more detail, and next time I have a chance to work on it, hopefully something here will lead me in the right direction.
I'll do that next time I work on it. May not be until the weekend. :-(...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
Ugh, I knew I shouldn't have been celebrating so soon, but damnit [I]it felt good[/I]. Turn out, it was just my ignorance leading me to incorrect assumptions.
I was looking for -24V on that cap, but I don't really know what "negative voltage" is, so I didn't realize I needed to check for the voltage on the negative side of the cap. It was there all along. In fact, when I removed the cap, I found fairly pristine pads underneath; turns out I took that picture [I]before I went back and cleaned up the pads.[/I]...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
I may have found the problem!!!! I haven't had a chance to remove that cap yet, but I realized I had taken some pictures during the recap, so I went back and found a picture of the pads for CC503. There is CLEARY corrosion on the bottom 1/3, and that seems to be exactly where it connects to the trace. I've very new to all of this, and probably thought since 2/3 of the pad looked good, all would be well. Lesson learned!
The pads looks scratched up from me trying to remove some of the corrosion with my tweazers...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
I did some more voltage checking. This time of Capacitors and Vias. I seem to have a problem at CC503. See pictures.
I'll be removing that cap to see what is happening underneath it. Any other advice? Thanks!...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
Ok, finally had a chance to tear this thing apart again. :-)
For anyone who doesn't know, but wants to, here is the [URL="https://www.badcaps.net/forum/attachment.php?attachmentid=246109&stc=1&d=1633661453"]device in question[/URL]. It's a portable version of the PC Engine, which is the Japanese version of what we called the TurboGrafx 16 in the US. It's from 1991 and is notorious for bad capacitors, much like the Sega Game Gear.
Here's a look at the [URL="https://www.badcaps.net/forum/attachment.php?attachmentid=246110&stc=1&d=1633661654"]2...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
Oh man.... I have to apologize. I was researching this issue for a couple of days before I decided to post for help. I was so absorbed in this problem, that I got tunnel vision and just assumed (subconsciously) that everyone at the several forums where I found related posts (including this one) knew all about this device!
I really appreciate the nice way you've brought this to my attention, and I will get some pictures uploaded just as soon as I have a chance (at work all day).
And to...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
I'm afraid you've misunderstood me, and that's probably my fault for rambling so long, but the screen NEVER comes on. Not a flicker, no backlight, no game. NOTHING. NOT EVER. Doesn't matter how long I wait. That certainly isn't intended behavior. :-)...Leave a comment:
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Re: PC Engine GT - No Video or Backlight
Thank you, I'll look for that thread, but I have to ask: If it was [I]just[/I] a bad backlight, wouldn't I still be able to see a faint video image?
I get nothing at all, just a black screen, which is what makes me think maybe the screen isn't getting power at all. I'm going to try and check that with my multi-meter, but I don't exactly know where to place the leads. I should be able to figure out at least that much with more googling though. :-)Re: PC Engine GT - No Video or Backlight
...Leave a comment:
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PC Engine GT - No Video or Backlight
Hello everyone, I am obviously new here, but this seems like a good community to try and get some assistance. I have done a lot of googling already, but have not come across a thread with my exact issue.
I recently purchased a PC Engine GT from Japan. When I first received it and tested on batteries, there were no signs of life at all. Now, I wish I had left it running for a minute to see if any sound started (I have one game to test with), but I didn't. I flipped the power switch, saw no signs of life, and turned it back off. I wish I had played with the volume and brightness... -
Re: New Members - please post your introductions here
Hello everyone, I missed out on the 8-bit computers of the 80 even though I was the perfect age! (born 1976) Earlier this year I discovered this egregious hole in my past, and to fil it I purchased a working/recapped C64 off ebay and did my best to relive the childhood I never had! :-)
I bought a joystick for the C64, and it had 2 buttons. I asked the seller if I could map button 2 to UP (to have a jump button in many C64 games) and he said, "yes, but it requires a little soldering". At first that put me...Leave a comment:
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