March 5th, 2024, 6:30
March 5th, 2024, 6:38
March 5th, 2024, 6:57
pepe wrote:measure the 000 ohm resistor in between the 2 connectors with a multimeter, diode/continuity check mode. it should beep.
March 6th, 2024, 5:26
fzabkar wrote:pepe wrote:measure the 000 ohm resistor in between the 2 connectors with a multimeter, diode/continuity check mode. it should beep.
It probably will beep. The usual fault is dry solder joints at each end of the resistor, not the resistor itself. Reflowing the solder should fix the problem.
March 6th, 2024, 10:34
March 8th, 2024, 3:50
March 8th, 2024, 5:17
March 8th, 2024, 5:39
March 9th, 2024, 6:45
Lardman wrote:A broken solder joint wont be the source of a short - nice catch though.
If you're struggling with soldering and can't justify the JVC kit (who can) an Axium T115 station is cheap enough and will have no problems at that scale with decent optics.
March 9th, 2024, 7:28
A little off on the scale there. 150-200mA could be standard drawn on the board, check with a donor. Assuming you've reflowed that troublesome resistor that sort of pattern is usually an IC failing to start and whilst your thermal camera show "hot spot" these aren't hot enough not to be normal operation. Given all the major IC's appear to be getting power I'd start looking at enable signals but check your voltage rails anyway. Also look at the pcb on edge - is it flat ?The PC3000 showing jumping amps between 16-20
March 9th, 2024, 14:22
March 11th, 2024, 5:16
fzabkar wrote:Just FYI, a transistor is often used to drive a device whose current requirements are greater than that which can supplied by the MCU or bridge.MCU I/O pin --> transistor --> LED
http://markingcodes.com/search/c/W1P
PMBT2222A, NXP, NPN switching transistor, 40V, 600mA, marking *1P, SOT23:
https://datasheet.lcsc.com/lcsc/1811141239_Nexperia-PMBT2222A-215_C23869.pdf
Have you dumped the MCU ROM? Perhaps it is corrupt? I have written a tool to check its consistency.
BTW, did you measure the voltage on that MCU pin to confirm that the trace is indeed open?
March 11th, 2024, 5:17
March 11th, 2024, 10:37
March 12th, 2024, 2:42
March 12th, 2024, 12:56
May 8th, 2024, 21:25
fzabkar wrote:The tool runs from the command line in a Windows DOS box. Just type the name of the file to see the embedded usage instructions.
As for your ROM dump, it has hundreds of errors.
May 8th, 2024, 21:48
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