Recent content by retronexus

  1. retronexus

    Shorts on MAX77801EWP

    Hi all, I checked the 3V3 rail and noticed the following: - Input voltage of VSYS 4.2V injected is seen on the input cap - The output is 0V on the output caps, also showing a short on both caps to GND. - The console when connected to my Bench PSU and activating the power on the PSU shows 0A...
  2. retronexus

    3V3 output and current draw on SWITCH OLED

    It became even more strange now. I changed the 3V3 IC, with no change. The board still draws 600mA at 4.2V /1A injection before boot. Then I removed for testing the MT92 and BQ chip, and still there is current draw of around 550mA. I am not sure anymore what to look for at this point?
  3. retronexus

    Specs of the 3.3V oled soldering point component

    It became even more strange now. I changed the 3V3 IC, with no change. The board still draws 600mA at 4.2V /1A injection before boot. Then I removed for testing the MT92 and BQ chip, and still there is current draw of around 550mA. I am not sure anymore what to look for at this point?
  4. retronexus

    Specs of the 3.3V oled soldering point component

    That's strange, that I have an OL here, but the diode mode value is correct then
  5. retronexus

    Specs of the 3.3V oled soldering point component

    Where would I have to measure the resistance to ground then, just out of interest? Yep, diode reading seems fine and the 1V inject too, so i will order sam 77801s and hope to get back my 3V3. Will update! thank you for your help so far!
  6. retronexus

    Specs of the 3.3V oled soldering point component

    maybe my brain just stopped working, but this is what i am measuring right now:
  7. retronexus

    Specs of the 3.3V oled soldering point component

    Just rechecked: 0.5-0.7 Ohm measuring to ground 0.415V measuring diode mode
  8. retronexus

    Specs of the 3.3V oled soldering point component

    between 0.4R and 0.5R
  9. retronexus

    3V3 output and current draw on SWITCH OLED

    Ah interesting, I thought it would not be needed for the first boot stage. I will try and see if this changes anything, Though I think the issue might be with the Voltage Regulator, given the injection of 1V directly into the output of 3V3 Cap shows no significant current draw downstream.
  10. retronexus

    Specs of the 3.3V oled soldering point component

    Year, i checked with the 1V injection directly into the Cap for currenct draw hinting towards failed components down the line, but that seems fine, so my assumption would be the 77801
  11. retronexus

    3V3 output and current draw on SWITCH OLED

    Nope, at this point I didn't fully boot up the device, so I didn't put the resistor in place. Would that be needed in any case to work?
  12. retronexus

    Specs of the 3.3V oled soldering point component

    What would be possible causes vor only receiving 0.8V at this stage?
  13. retronexus

    3V3 output and current draw on SWITCH OLED

    Hi all, I have an issue with a Switch OLED I am trying to fix up. Currently only injecting 4.2V/1A at the charging coil to test the soft boot stage and voltages. The cap at the top right has the correct 4.2V on the input, while the output only shows 0.8V instead of 3V3 I have expected. On top...
  14. retronexus

    Specs of the 3.3V oled soldering point component

    When measuring the voltage there I see 0.8V. I would have expected 3.3V?
  15. retronexus

    Hacking Hardware Picofly - a HWFLY switch modchip

    How do I test for correct 3V3 output voltage on that IC? I would have expected to see the voltage on this inductor
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