PCEngineFans.com - The PC Engine and TurboGrafx-16 Community Forum

NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: Keith Courage on May 17, 2011, 04:53:28 AM

Title: Turbo express No power
Post by: Keith Courage on May 17, 2011, 04:53:28 AM

I have a Turbo express that just doesn't power on. I've tried both an AC adapter and batteries and I get nothing. No screen or sound. Screen stays completely black and does not turn green or white. Any ideas of what part of the board would make it have no power all together?

Title: Re: Turbo express No power
Post by: pceslayer on May 17, 2011, 06:02:18 AM

There is a black fuse right below the power switch that might be bad. Test with a multimeter...


F500 1A

Title: Re: Turbo express No power
Post by: Keith Courage on May 17, 2011, 09:32:04 AM

Just tested the fuse and I believe it is bad. Couldn't get anything to come through my multimeter. Any clue what the specs of the fuse are? All I see is that it is 1A.

Title: Re: Turbo express No power
Post by: Keith Courage on May 17, 2011, 03:23:03 PM

Okay the fuse is definitely bad. I bypassed it and the system turned on. However, still have no idea what kind of fuse to use to replace it.

Title: Re: Turbo express No power
Post by: pceslayer on May 18, 2011, 07:28:54 AM

technically any fuse rated @ 1 amp will work as long as its over 7 - 10 volts

you can try picking up a 1 amp nano fuse as they are about that size

Title: Re: Turbo express No power
Post by: Charlie on May 18, 2011, 08:56:26 AM

Digikey F2313-ND

Charlie

Title: Re: Turbo express No power
Post by: Keith Courage on May 18, 2011, 11:26:01 AM

Thanks for the help on the digikey number. Now I know what I am looking for. Picked up some from a local electronics store and the turbo express now works great. Thank you also pceslayer for helping me diagnose the problem. I've never had a Turbo Express with problems other then capacitor issues before. So the no power problem was something completely new to me.

Title: Re: Turbo express No power
Post by: Keith Courage on September 15, 2011, 06:41:31 AM

Well, I am now working on another turbo express with no power. The problem is not the fuse on this one and when you flip the switch to turn on the system I can see the light on my ac adapter dim like there is a huge drain. This doesn't happen on a good working turbo express. With the power switch off the ac adapter is just fine. Anyone have any ideas as to what is fried? I have a feeling this board is toast but wanted to see if anyone had any ideas first before I just sell it off for parts.

Title: Re: Turbo express No power
Post by: thesteve on September 15, 2011, 07:32:38 AM

i would look at the 5V regulator circuit.
the TE does not use a 7805 like the consoles do, it uses a voltage converter chip instead.
i havent looked it to it, but i suspect its near the top of the board.

Title: Re: Turbo express No power
Post by: Duo_R on August 26, 2012, 07:00:08 AM

Keith did you use a 125V 1A fuse?

Title: Re: Turbo express No power
Post by: Keith Courage on August 26, 2012, 08:25:44 AM

Yes, that is the fuse I used.