Author Topic: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix  (Read 21590 times)

fagin

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #225 on: January 24, 2014, 03:45:22 AM »
Any pointers on how to resolve this low voltage issue?  :)

thesteve

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #226 on: January 25, 2014, 12:55:59 PM »
First unplug the screen and recheck (keith had a shorted screen)
The video cap fixes all relate to that voltage
The pot near the side of the unit adjusts the -24V supply, the one near the top adjusts the +5V

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fagin

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #227 on: January 26, 2014, 03:00:32 AM »
First unplug the screen and recheck (keith had a shorted screen)

Around 11.6v with the screen unplugged.

thesteve

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #228 on: January 28, 2014, 06:51:40 PM »
That's low
Check the large 22uf cap and the 4.7s


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fagin

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #229 on: January 28, 2014, 10:15:39 PM »
By tweaking VR500 I can just about get to 14v.

Apologies, not sure what you mean by "check". 

All caps have been replaced and it's the same problem I had prior to the cap replacement.

thesteve

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #230 on: January 29, 2014, 04:38:39 PM »
I was vague because I want you to test the caps and check their connections
Also inspect the board around them


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cam

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #231 on: March 08, 2014, 11:36:04 AM »
You should fix this problem following this tutorial (in french) :

http://blog.home108.com

Best regards,
~~~~~~~~~~~~~~~~~~~
http://blog.home108.com

fagin

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #232 on: March 08, 2014, 10:06:21 PM »
Thanks for that link..... where are the screens available from?

thesteve

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #233 on: March 09, 2014, 05:04:13 AM »
If you need an original screen, anyone doing screen swaps should have a pile of good ones

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fagin

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #234 on: March 09, 2014, 05:13:50 AM »
It's not an OE screen I need.  Something is obviously mullered with my main board, even after looking at the areas you suggested, I didn't get anywhere. 

thesteve

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #235 on: March 09, 2014, 07:51:37 AM »
screen swaps can be done, with a composite mod

ebay sells screens, some work some dont

coryoon

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #236 on: July 09, 2014, 11:42:01 AM »
Hi,

I have a GT with the 'screen on but no picture' issue - screen is black (but lit), sound works etc.

Is there anyone in the UK that does the Cap replacement?

Thanks.

Rosser

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #237 on: August 10, 2014, 06:26:23 PM »
deleted post
« Last Edit: August 13, 2014, 01:32:59 PM by Rosser »

Moudamir

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #238 on: September 08, 2014, 12:59:06 AM »
Hello everyone,

So I follow the replacement process for the capacitors, mine was showing no video and no audio. Video only backlight sometimes shadows !!! And audio was low.
I've changed the audio circuit !!! And it's perfect. And I've changed the video one it came back for 10 sec and that's it !!! Don't know what to do !!!
I've changed total 10 capacitor out of 18 still nothing. Didn't go under the shield yet...
Any ideas ?

Keith Courage

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Re: REPAIR GUIDE - TurboExpress/PC Engine GT: Video Fix
« Reply #239 on: September 08, 2014, 07:31:49 AM »
Remove the shield and change the rest before looking at any other options for the problem. That way you can at least rule out the capacitors if the problem still exists.