Hello guys, maybe the issue of touching the facility on the laptop computer is essentially the most tough and time consuming illness. I wish to share the issue of laptop computer touching HDMI port that I encountered on laptop computer HP G42 AMD, utilizing chipset 216-0752001.
Unique situation: Once we plug within the adapter charging jack, the sunshine proper the place the charging jack is on the aspect of the gadget lights up. At the moment, it’s understood that the gadget has acknowledged the charger. The situation is that this system in Bios and IO have to be good. The three.3v and 5v sources are utterly enough.
Once we activate the supply, we see that the charging jack mild on the aspect of the machine is off, and the 3v and 5v sources are additionally misplaced. When unplugging the charging jack for a number of seconds after which plugging it again in, the sunshine on the aspect of the gadget lights up once more and the cycle continues to repeat after we activate the facility. That proves the gadget has touched, the ic supply 3v, 5v has been locked, not permitting us to open it once more.
Restore course of: We measure all coils on the circuit, there are not any coils low, however the energy jack touches once more. Proper now I’ve give you a solution to measure the resistance proper after the supply is activated. As a result of we solely have to activate the supply, it’s going to contact, so measuring the resistance proper now could be essentially the most cheap. The outcomes are very constructive after activating the 5v copper coil with a resistance of 8 ohms (in response to the HP G42 AMD diagram). Inferred to the touch the 5v supply of the following stage.
Take the facility provide to regulate to 5v and provide it to the 5v coil (pink rod in 1 of the two coil ends, black rod linked to floor) we discovered that the PQ39 FET may be very scorching. Trying on the diagram, it’s identified that it takes the 5v supply of the copper coil to supply 5v for the next circuit. Proceed to produce 5v to the next circuit, we discover a scorching HDMI port.
Lastly, trying on the HDMI port, I found that there have been 2 protruding pins behind touching the metallic a part of the primary, inflicting the 5v supply to be touched. You simply have to take the screwdriver to push it ahead and it is okay.
