Hey,
Hoping the wizards on this forum can help a little with two Switch mainboards which both seem to exhibit the same problems. Here's my best summary of the diagnosis so far:
Help!
Hoping the wizards on this forum can help a little with two Switch mainboards which both seem to exhibit the same problems. Here's my best summary of the diagnosis so far:
- Both units exhibit black screen, no backlight, nothing on screen. Battery charges slowly. Both pull 0.42A.
- With both boards out, no battery, PC connected and memory module unclipped (which should force RCM), I get no detection from a PC. Other boards work so know config is good.
- Buzzed D- and D+ through to test points near Realtek chip with no continuity issues. No shorts.
- I've captured I2C traffic on Port 0 and see no traffic (see fuel gauge diagnostics on boot with known good unit)
- M92T36 and BQ24193 have been checked and everything compares favourably to a known good unit. Only odd reading is on Pin 7 DSCHG on M92 which I measure at 4.8v compared to 0.1v on known good board.
- Main power rail to PMIC tests out with SYS power OK (3.45v / 3.99v)
- PMIC outputting 1v, 3.3v at test pads around IC. 1.8v visible elsewhere.
- CPU and GPU bucks test out as far as I can tell
- Neither board has water damage
- Hard to tell if anything is getting warm
- USB-C has no shorts and pins are clean and good
- No shorts across any of the usual capacitor arrays around the board
Help!
Last edited by SheriffBuck,