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NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: choijimmy on February 13, 2015, 11:53:53 PM

Title: pc engine GT only work with power adapter but Not battery
Post by: choijimmy on February 13, 2015, 11:53:53 PM

Hi,

  I just did re-cap for a pc engine GT and now it power up with power adapter and works perfect. Interesting enough is I found that it didn't power up with battery ( I did double check the battery and test the battery cable inside the GT with multimeter and does provide 9v )

  Any idea how can I fix this issue? I recall I can jump the wire to bypass it but Not really sure how to do it.

Thanks!
Jimmy :D

Title: Re: pc engine GT only work with power adapter but Not battery
Post by: Keith Courage on February 14, 2015, 06:54:23 AM

Scrape off the gray junk over the AC adapter port and follow the traces. You should be able to see the traces as to where positive and negative are supposed to go.

You might only have to retrace the positive or the negative. Meaning you may not have to tap both.

Title: Re: pc engine GT only work with power adapter but Not battery
Post by: choijimmy on February 14, 2015, 12:20:18 PM

Quote from: Keith Courage on February 14, 2015, 06:54:23 AM

Scrape off the gray junk over the AC adapter port and follow the traces. You should be able to see the traces as to where positive and negative are supposed to go.

You might only have to retrace the positive or the negative. Meaning you may not have to tap both.

Thanks Kieth. I was putting all my work on the positive trace. Indeed, the issue is negative side trace. I tap the negative side trace and now works perfect. Thanks for the Hint.

Jimmy

Title: Re: pc engine GT only work with power adapter but Not battery
Post by: turbokon on February 15, 2015, 01:32:55 PM

Replace the dc jack, it should fix your problem.  The dc jack has a switch that un hook the connection from the batteries when dc is plugged in.   Over time, that switch goes bad.

Title: Re: pc engine GT only work with power adapter but Not battery
Post by: choijimmy on February 16, 2015, 12:32:23 AM

Quote from: turbokon on February 15, 2015, 01:32:55 PM

Replace the dc jack, it should fix your problem.  The dc jack has a switch that un hook the connection from the batteries when dc is plugged in.   Over time, that switch goes bad.

got it. let me try

Title: Re: pc engine GT only work with power adapter but Not battery
Post by: choijimmy on February 16, 2015, 01:08:30 AM

just tried. Yes, the DC jack replacement fixed the issue  :clap:

Thanks a lot!