Products > Test Equipment

TC1 lcr-meter transistor-tester fix

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cuistots:
the  3.3V regulator normaly works.

indman:
U1- the 74HC573; 74HCT573 is an 8-bit D-type transparent latch with 3-state outputs
Try replacing this chip. Another option is to remove this chip and connect the ATMega outputs directly to the display lines through 10kΩ resistors.
They are already on the display board. But this option is only at your own peril and risk.  :)

Krafte:
Yesterday, I got a shiny new TC-1 directly from China
I successfully got a 1.38m firmware running and testing components seems to work.
However, the LCD keeps flickering and the device turns randomly off. Also, the menu is not accessible by double pressing the button.
I think the reason is the stock firmware on U4. I tried to replace it with the custom one. But it seems the chip is not responding to the programmer.
I tried everything I could imagine , different PCs different uart adapter, all combinations of power on cycles for U4, double and triple checking the connections and pinouts, but nothing helped.
Anybody with same experiences? Any advice apart from replacing U4 by the proposed circuit of Markus?
The only thing that's a little strange are markings on the chip. It is "STC 16L104W".

UPDATE:

I got the chip to respond to me using my RPi 3 and stcgal (I strongly recommend this tool). It reported as STC15L104W.
However, flashing was not possible -> it always stopped while switching baud rates.
Finally with baud rate 1200 it was flashing, slowly but successfully :)

Kamlakkannan:
Hey, I just got the lcr t7 from China yesterday(after almost 3 months). It worked for sometime then it just displayed a white blank screen. After sometime it worked, but then again it displayed just white blank screen. This process repeated and now I am stuck with something that just displays a white screen. I checked the capacitors they aren’t short. The battery is good and I don’t know what to do next, so can you please help me. :'(

Kamlakkannan:
And again after sometime it started working.

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