Products > Test Equipment

TC1 lcr-meter transistor-tester fix

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galaga1982:
I think it's low drop out too, but I'm not sure if it's caused the mcu to fail. There was no back light problem before the disaster.

digik:
I have this version:



after testing one charged cap is dead. I have dead short betweed D1 terminals.
I have removed D1, D2, C3, C25 and C30, same result.
I removed 78L05 and is still dead with a short between D1 terminal.

Is MCU bad?

madires:
Yes, most likely. BTW, that MCU is an LGT8F328.

digik:
is there a reliable way to test if is the MCU?

also seems that the LGT8F328 version is the highest specs one but also the only one without schematic available

madires:
Power the tester by a lab PSU and look for hot components. Proper testers come with an genuine ATmega.

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