Author Topic: TC1 lcr-meter transistor-tester fix  (Read 208233 times)

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Offline ssimic71

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Re: TC1 lcr-meter transistor-tester fix
« Reply #400 on: January 21, 2025, 06:04:49 pm »
Hi guys, what is wrong with my LCR TC1? It shows unreadable number in measurements, like in the given figure.

tnx,
Sasa
 

Offline madires

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Re: TC1 lcr-meter transistor-tester fix
« Reply #401 on: January 21, 2025, 06:23:04 pm »
Was it working before? Did it start suddenly or became worse with time?
 

Offline ssimic71

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Re: TC1 lcr-meter transistor-tester fix
« Reply #402 on: January 21, 2025, 06:26:10 pm »
That how it was when I first turn on. Until now, I tryed just to calibrate it, and that was succesful. Although, during calibration, also showed this peculear numbers in percentages.
 

Offline madires

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Re: TC1 lcr-meter transistor-tester fix
« Reply #403 on: January 21, 2025, 06:52:37 pm »
In case the tester works fine besides the weird digits it could be a bad firmware. Since the tester is new I would ask the seller for a replacement.
 

Offline ssimic71

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Re: TC1 lcr-meter transistor-tester fix
« Reply #404 on: January 21, 2025, 07:23:35 pm »
It was bought from Aliexpress, the seller is informed about the problem, but I do not expect miricle. :)
The idea of refreshing firmware is ok to me. Could you please direct me how to upgrade, and where to find latest files.

Thank you very much
Sasa
 

Offline madires

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Re: TC1 lcr-meter transistor-tester fix
« Reply #405 on: January 21, 2025, 07:41:18 pm »
That depends on the specific model you have. Current models come often with an alternative MCU, making it hard to get any firmware. Genuine ATmegas are supported by the two OSHW firmwares. Please post a picture of the PCB and I might be able to identify the MCU type.
 

Offline ssimic71

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Re: TC1 lcr-meter transistor-tester fix
« Reply #406 on: January 22, 2025, 08:15:40 pm »
Here are the pictures, there are no markings on mcu.
 

Offline madires

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Re: TC1 lcr-meter transistor-tester fix
« Reply #407 on: January 22, 2025, 08:51:14 pm »
Looks to be an LGT8F328 (one of the alternative MCUs), i.e. not supported by the OSHW firmwares.
 

Offline ssimic71

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Re: TC1 lcr-meter transistor-tester fix
« Reply #408 on: January 22, 2025, 08:54:16 pm »
Tnx for clarifying.


 

Offline wickedrc

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Re: TC1 lcr-meter transistor-tester fix
« Reply #409 on: February 05, 2025, 11:46:23 am »
Hi Guys, and congratulations for this useful forum!

I've in trouble with a TC1 tester (version with ATMEGA324PA)

It's been broken after a check of a charged capacitor  ::)

I've check it, and I've found broken DZ2 and U1.

I've changed them, now the tester starts, but I've backlit blank screen  |O

Can someone explain how to flash the U1?

I've already bought a USBasp-H6P interface, and I've soldered a connector to tester PCB (as in picture)

Thank you so much!
 

Offline vinhlg

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Re: TC1 lcr-meter transistor-tester fix
« Reply #410 on: Yesterday at 09:24:53 pm »
Hello all,

Does anyone have the schematic diagram of this TC1 version?

My TC1 broken, LCD display is total black. When I press "Start" L1 becoming very hot. It seems a short-cirtcuit somewhere?
Any advices? Thanks.

--- update ---
I think I found the reason: U1- LGT8F328 is dead - almost short circuit between PIN 4 (VCC - 5V) and PIN 5 (GND). Removed U1 and I have light on display - (of course nothing).
It was my mistake: I check capacitor during charging the battery of LC1 - because I saw low voltage.
Lesson learned.

Solution is replacement of U1 and reprogramming it. I think.
« Last Edit: Today at 01:34:19 am by vinhlg »
 

Offline madires

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Re: TC1 lcr-meter transistor-tester fix
« Reply #411 on: Today at 10:56:01 am »
... if you're able to find the firmware for the LGT8F328. That MCU isn't supported by the OSHW firmwares (only ATmega).
 
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Offline madires

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Re: TC1 lcr-meter transistor-tester fix
« Reply #412 on: Today at 11:00:15 am »
I've in trouble with a TC1 tester (version with ATMEGA324PA)
...
Can someone explain how to flash the U1?

Please search the web for 'programming ATmega' and you'll find tons of tutorials.
 


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