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T23 starts only from battery, not from AC

T20-T23 Series and T30 specific matters only. NOT for T25-Retro.
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RealBlackStuff
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T23 starts only from battery, not from AC

#1 Post by RealBlackStuff » Wed Nov 23, 2016 4:57 pm

This T23 has a new motherboard, but will only boot with a main battery installed.
If any charger is connected, no go...
My T23 knowledge has become rather rusty, any suggestions?
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Re: T23 starts only from battery, not from AC

#2 Post by ajkula66 » Wed Nov 23, 2016 5:50 pm

What happens if you insert the charger once the machine has started booting?

New motherboard or not, still sounds like a board problem to me.
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Re: T23 starts only from battery, not from AC

#3 Post by rkawakami » Wed Nov 23, 2016 6:56 pm

Going to have to agree with George on this one... sounds like the DC input circuit is toast. I'm assuming that whenever an AC adapter is plugged in, the system shuts down and no indicator lights are on, yes?
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Re: T23 starts only from battery, not from AC

#4 Post by kfzhu1229 » Thu Nov 24, 2016 9:52 am

Also try what happens if you dock it in ThinkPad dock as charger.
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Re: T23 starts only from battery, not from AC

#5 Post by RealBlackStuff » Thu Nov 24, 2016 10:37 am

No luck in the dock.

I can start on battery, then put in AC, makes no difference.
But if I leave AC in and remove the battery, it immediately switches off.

Guess I'll have to measure the MOSFETs FDS6990A and replace them if needed.
I have another mobo with only 1 working RAM-slot, that I can use as donor.

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Re: T23 starts only from battery, not from AC

#6 Post by kfzhu1229 » Thu Nov 24, 2016 11:21 am

Do you think a blown fuse is more like it?
_________________________________
T23 PIII 1.13ghz 1gb W7
2xT43 14.1" 2.26 SXGA+ 2gb 1*fp W10
T530i 15.6" i7 16gb fp W10
Flexview UXGA:
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Re: T23 starts only from battery, not from AC

#7 Post by RealBlackStuff » Thu Nov 24, 2016 11:23 am

No, they're all good.

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Re: T23 starts only from battery, not from AC

#8 Post by kfzhu1229 » Thu Nov 24, 2016 12:56 pm

Then I guess take a voltmeter and see if it gets any electricity with AC adapter and also check antenna routing if you have antennas in that machine.
Let's just hope that there isn't any capacitor failure or microcracks
_________________________________
T23 PIII 1.13ghz 1gb W7
2xT43 14.1" 2.26 SXGA+ 2gb 1*fp W10
T530i 15.6" i7 16gb fp W10
Flexview UXGA:
A30p PIII 1.2 1gb W7 (IDTech)
T43p 2.26 2gb fp W10

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