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TC1 lcr-meter transistor-tester fix

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amunro:
Posting an update. So I received some atmegas from China which look like fakes. One of them does not have a circle near pin 1 which is really suspect. Anyhow, ordered one locally from RS Components in the UK, which was pretty reasonable and had free shipping (if I had known that I would have ordered from them). This flashes fine using a USBASP (with the latest firmware); you need to use -B 5 for the slower rate comms with avrdude. I will try the Chinese atmegas with a crystal at some point just to confirm they are fake; if they do work they are not new from Atmel/Microchip! As I was testing the fake atmegas, I used a break out board and just soldered pins 1 thru to 6 to allow the ISP flashing. A nice diagram here https://www.kanda.com/avr-isp-circuits.html of what is required (need a 100nF capacitor and a 10k resistor on the board). Once I flashed the Rs Components atmega I then undersoldered it from the breakout board and onto TC1. Low and behold we have a working TC1.

So to summarize, SV05 had a short pulling the 5V line down; replaced that. Still had a short, but not as bad. I then had the issue as shown in the photo by Bighouse, although my issue was with pins 1 and 2. Lifted pin 27 (AVCC) of the atmega off the board and short gone. Replaced both of these components. Thus I would say if you have the issue as shown with Bighouse you might need a new atmega. Used indman's LCR-TC1 original firmware on yadi.sk (date 9/16/2019).

Hope my hard earned effort helps someone! Was pulling my hair out with the fake atmegas!

Attached a photo of the breakout board patched into a 6 to 10 pin ISP adapter. 10k resistor on the top and 100nF capacitor is a smd soldered on the bottom of the board.

capitainekurck:
Hello all

I new on this forum.
I bought one of there tester on ebay.
I receive it today it work 5 or 10 minutes and it fail. i was trying to check some resistor and led to test it (not capacitors) and suddenly it stop to work. it don't turn on any more. The battery is full load. when i push the button to power it on, the screen become white ( it normally black when it power off) and it turn black few seconds after.

Is it the same problem as yours or for you the display stay black ?

regards
L.S.

quinhomvs:
Hi , I am from Brazil , my TC1 multtest  , reads the components , but when there is no component connected shows the measurement as in the attached figure, someone already had a similar error .

Translate.

madires:
That means there's a small current flowing between the probe pins, possibly caused by the SRV05-4.

Del:
Hello.  I'm sorry, I'm using a translator . Can you share the compiled hex and EEP firmware ?  I wanted to update the firmware but broke the tester . Compiled the firmware from MARKUS, the device is working, but there are no functions IR and ZENER diode , . Thank you in advance !

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