'Tis likely the dreaded power socket contact problem.

When you disconnect the charger plug, a little socket
contact doesn't fully re-make.  If due to crud or
oxidation, a touch of switch cleaner and a careful
prod with a cocktail stick can help.

Regards,

Fred.

--- x509v3 <x509v3@...> wrote:

> If I read about this story in this group, I wouldn't
> have believed it. But it happened to me 
> and I wanted to share. Has anyone else seen this?
> 
> I have a 2-year old TH-F6A that sees very light use.
> It's extremely well cared-for, it 
> spends most of its time plugged into its stock
> charger waiting for an emergency or the 
> weekly net. The radio hasn't been modified in any
> way and I'm only using the stock 
> Lithium battery and charger.
> 
> Yesterday I unplugged it from the charger to use it
> on the weekly net and ... it didn't 
> power on. If I plugged it back in to the charger, it
> would power up. Removing and 
> reinstalling the battery didn't help. Switching
> batteries from my wife's F6A didn't help. My 
> battery on her HT worked fine, so I confirmed it
> wasn't a battery problem. I tried doing a 
> full reset on my HT and that didn't help either.
> 
> I left the unit unplugged and uncharged all day.
> When I came home from work and tested 
> it, the unit would still not power on when powered
> from battery.
> 
> Using a DVM I verified that the battery was properly
> charged. I also tested the resistance 
> across the HT's battery terminals on its back case:
> 230 KOhms. I compared this value to 
> my wife's (working) HT: her's read 24 kOhms. I
> double-checked the results.
> 
> I then installed the battery on my HT and .. it
> powered up!
> 
> I then tested the resistance of the same terminals
> on my HT and they were 24 kOhms.
> 
> What does this mean? I have no idea.
> 
> At first I assumed that a fuse may have given out on
> my HT, but after seeing the difference 
> in resistance values between a working and
> non-working unit, that's clearly not what 
> happened.
> 
> I've had this radio fail to powerup one other time
> in the past 2 years but I seem to recall 
> that simply removing and reinserting the battery
> fixed it last time.
> 
> So, if this happens to you, you might want to unplug
> your HT from everything and briefly 
> test or short out the terminals on the back of the
> radio to drain it of some sort of residual 
> charge.
> 
> 

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