My rpi work perfectly until I touch it, It not boot up then I found the L4 chip HDMI port is missing(I have touched HDMI port I think my fingernail pull it off...).

I found that tiny chip in the box tried to soil it back but no luck.(the board seems fine but the chip left 1 foot on board), I have checked no more chip missing.

Solid red + green light with/without sd card, no Video output and the usb port no power output. (green blink once after power connect)

I want to find what l4 is and try to replace a new one.

may have other reason make the device fail to boot. I have a Raspberry Pi 2 Model B.

enter image description here

  • No markings on that mosfet? Jun 17, 2018 at 20:37
  • No markings on each side. Jun 18, 2018 at 7:52

1 Answer 1


L4 through L7 appear to be surface-mount common-mode chokes on the HDMI output's TMDS pairs. It may also be possible to bypass a missing choke by bridging each processor-side pad (right side of photo in question) to its corresponding connector-side pad (left) with thin wire or component lead trimmings, at the expense of the HDMI output being less reliable and more likely to cause radio-frequency interference.

Missing or broken HDMI chokes shouldn't prevent the board from booting or generating composite (analog) video, but if an HDMI display is connected at power-on it might still detect it and try to use HDMI instead of enabling the composite output.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.