kiteretro / Circuit-Sword

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Board is not booting up. #57

Closed CastleTiles closed 5 years ago

CastleTiles commented 6 years ago

I'm not getting the board to boot up at all. The LCD briefly flashes white when powering on and the screen immediately turns black, Any ideas on how to fix this? The only things I have noticed is that the 1.8 rail seems dim, its on, just not nearly as bright as the other rail indicators. Also a blue light appeared near the battery connector and turned off after several minutes. I'm not sure as what sort of activity to expect during the first boot procedure. 2 3 1

kiteretro commented 6 years ago

From the pics, it appears the board is booting ok (the PGOOD green LED is on (next to the "PON" LED), which is only possible when it boots) which is one thing :)

I'm going to assume that if you plug HDMI in, after 30 secs or so you see stuff on the screen? Can you confirm this?

Next .. if you remove the CM3 module, directly underneath it is a set of chips in the middle with an LED named "BL" or "BL OK" or something, it's a RED LED ... does it glow brightly or dimly? Also does this area get hot if you touch it? If you disconnect the LCD, does this LED get brighter? or does the heat output of those chips change at all?

Next.. with your multimeter in voltage mode, measure the solder holes on the board for the 5v, vbat, 3.3v, 1.8v and report these back..

CastleTiles commented 6 years ago

No HDMI output. :(

BL LED glows dimmer with LCD connected and slightly brighter with LCD disconnected. No heat felt on chips in surrounding area with LCD either in or out.

What may be concerning is that upon first boot, and I apologize for not previously mentioning, but I did notice a fair amount of heat building up in that general vicinity. It felt more localized near the components grouped above the battery connector. I could be wrong. The heat stopped and quickly subsided before any further investigation could continue. Has not reappeared upon subsequent reboots :(

Voltage Readings: VCC = 4.95V 3V3 = 3.304V 1V8 = 1.78V VBAT = 4.15V

CastleTiles commented 6 years ago

I was so busy looking at components on the other side of the board that I didn't notice this. This is probably a big part of the problem. A trace has completely lifted/maybe melted off the board. Any ideas on what happened? Is this fixable? trace damge