T7-H tester "broken?"

[jhaneyzz]

I've had my T7-H for maybe two months but I was testing some transistors today and it suddenly was flashing basically just the yellow bar at the top of the screen.

I thought maybe the battery was low so I plugged it in and left it for a while.

Now there is just the yellow bar at the top of the screen and it never turns off. can't even manually turn it off.

Has anyone encountered anything like this?

 

[SillyOctpuss]

I've had my T7-H for maybe two months but I was testing some transistors today and it suddenly was flashing basically just the yellow bar at the top of the screen.

I thought maybe the battery was low so I plugged it in and left it for a while.

Now there is just the yellow bar at the top of the screen and it never turns off. can't even manually turn it off.

Has anyone encountered anything like this?

Yes. I had a nightmare time with component testers. My first one turned off while testing a transistor and never turned on again, my second stopped charging and my third had the same fault as yours. I ended up going for a dca55 in the end and calling it quits.

About 6 months ago MrsOctpuss bought me another one which (fingers crossed) has been fine, however, it doesn't get a lot of use. I only use it for things the dca won't do so it doesn't see a lot of action.

I seem to remember fixing one of my early ones by opening it up and disconnecting the battery, though I think that only worked once.

 

[andare]

I only use it for things the dca won't do so it doesn't see a lot of action.

Some things are too dirty to ask your main one to do.

I'm very happy with my TC1. Sometimes it sees germanium transistors as diodes.

Isn't it possible to do a hardware reset?

 

[szukalski]

Try holding down the start button for a while to see if it resets.

 

[KR Sound]

Give this a try also:

 

[steviejr92]

I have both the TC1 and DCA75 pro. I love them both. The TC1 is great for testing components while soldering ensuring theyre working and giving you accurate values.

Where the DCA shines is the transistors and diodes. Run the software that comes with the DCA and your able to run a rough test similar to the RG Keen testing and the way Small bear does their testing. Its always within 5% of the real test. Highly highly recommend the DCA 75 pro. Accounts for leakage and all.

I just realized you never asked for any of this

 

[SillyOctpuss]

Give this a try also:

Yeah this is what I had to do with one of mine but annoyingly it only worked once.

 

[RetiredUnit1]

I think if I was going to open it up, I'd just bypass the battery and go directly from the USB port. Those batteries are the same as used in the small drones, and are very unreliable.

 

[jhaneyzz]

Give this a try also:

I disconnected and reconnected the battery.

Now it turns on and off properly, but just displays the yellow bar when on.

Give this a try also:

 

[RetiredUnit1]

I can fix it!


Seriously tho, did you try testing the voltage output of the battery? I used to fly drones a lot, those batteries are crap. Some last one or two flights and are toast, others last a year. None last for 2 years....

 

[jhaneyzz]

Reads 3.1v so seems about right.

 

[jhaneyzz]

I can fix it!
View attachment 46941

Seriously tho, did you try testing the voltage output of the battery? I used to fly drones a lot, those batteries are crap. Some last one or two flights and are toast, others last a year. None last for 2 years....

you're just having too much fun with your profile picture...

 

[RetiredUnit1]

Reads 3.1v so seems about right.

Li-on's are usually 3.7 to 4.2, sounds about worn out!

 

[RetiredUnit1]

Reads 3.1v so seems about right.

If you run your finger along it, does it feel squishy like there's water in it? This is the sign of a dangerous li-on battery. When they get puffy it's even worse.

 

[jhaneyzz]

If you run your finger along it, does it feel squishy like there's water in it? This is the sign of a dangerous li-on battery. When they get puffy it's even worse.

You're still talking about batteries, right?

 

[KR Sound]

If you run your finger along it, does it feel squishy like there's water in it? This is the sign of a dangerous li-on battery. When they get puffy it's even worse.

I have a couple of RC trucks, and those batteries scare me when they get like that.