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TC1 lcr-meter transistor-tester fix

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galaga1982:

--- Quote from: madires on July 21, 2023, 09:28:42 am ---Any 6.8V TVS should be fine.

--- End quote ---

Hi madires,

I've read this thread several times, removed zd1 and dz2, and hoped it would be no problem, but the sad prediction was never wrong.
I connected 3.7 voltage battery, but the screen became very dark, and after a while I had no choice but to look at cell voltage.

I think atmega324p is broken. When the resistance of vcc and gnd is measured, a low value of about 50ohm is obtained.
Maybe the I/O is damaged by the energized capacitor, but I don't know why the screen got dark.

Regarding atmega324p mcu programming,
I have Xgecu t48 (upper version of TL866 programmer). I'm trying to program it with 324p mcu using qfp44 to dip40 adapter and I'm wondering if I need an isp connection as well.

I'm not used to programming avr microcontrollers. There are many ways like USB-UART, 3V3, etc,
but rather than buying another programmer, I would appreciate it if you could tell me how to use the TL866-based programmer I have.

Sungmin

madires:
Sorry, I can't help you with the TL866 based programmer. The universal programmer I have supports ISP and HV parallel programming of ATmegas. ISP is the standard method and the HV mode is used in case the fuses are screwed up and ISP doesn't work.

indman:

--- Quote from: galaga1982 on July 29, 2023, 06:35:55 am ---Regarding atmega324p mcu programming,
I have Xgecu t48 (upper version of TL866 programmer). I'm trying to program it with 324p mcu using qfp44 to dip40 adapter and I'm wondering if I need an isp connection as well.

--- End quote ---
No, you don't need isp in this case. If the qfp44 to dip40 adapter is working properly, you should have no problem programming the ATMega324 and any other controller. ISP is necessary if you are going to program the controller without removing it from the PCB (in the schematic).

galaga1982:
Thank you for answer. By the way, if the atmega324p breaks down, does the tc1 screen get dark? The zd1, dz2 diodes have already been removed.

madires:
Could be a backlight issue. Does the 3.3V LDO for the display output 3.3V?

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