| Products > Test Equipment |
| TC1 lcr-meter transistor-tester fix |
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| indman:
--- Quote from: distefanom on April 19, 2022, 07:20:20 pm ---It still won't work and the micro shows what's in the attached photo- --- End quote --- Once again I repeat to you, if you did not understand me before - your clone has a hardware problem and no other firmware will fix it! Use a multimeter to check the resistance of all measuring ports of the processor relative to + 5V and GND. |
| LesioQ:
My tester TC-1 M-Tester died after a dozen of tests done (original factory graphical firmware). The first problem I noticed was erratical behaviour - sometimes it booted OK but failed to test, sometimes it was hung-up on logo screen. Sometimes the main screen display had pixel errors (image distorted). Upon some testing I noticed it bahaves better if 5V supply is lowered somewhat. I ended up adding a Si diode right after (U3) 5V stabilizer with caps. Now Vcc is 4.2V. It may be that communication with a LCD working on 3.3 Volt supply was causing problems. Now it's testing OK, but fails to complete a Self-test - hangs at 7-16%. Maybe someone can elaborate on that. |
| madires:
The tester needs 5V to run properly. Possibly a power supply issue, e.g. a broken MLCC. Do you have a scope to check the output of the boost converter? |
| LesioQ:
Sure I do. I was searching for some fluctuations on Vcc 5V, but it looks OK. HV is 39V, (after C13 & C14 replacement). Vraw (5V stab. input) is about 9V. |
| madires:
A dodgy display (ST7735)? |
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