So finally I tried to talk with ENE KB9022 chip using the method with CH341A and 5 wires on the keyboard... When I tried to identify the chip I have no respond (it work perfectly with the BIOS chip). I checked the wiring twice. The SiO is feeded with 3.3V but not shorted and no communication.
Is it dead for you and will I find a working motherboard if I change it with a programmed one from ebay ?
Hope some of you guys may share is experience in that swapping.

I have replaced the chip with a brand new one. No the 19.5V is flowing everywhere properly. I have the 3V and 5V but not the 1.8V. I will try later to inject 1.5V on the 1.8V rail to see if anything getting anormally hot. Could it be a SIO issue ? I see the 3V getting in but nothing more.

Hello,

Motherboard (ZAM70 LA-A901P Dell Latitude E5450) not starting (no short on the main line).
When insert ac plug I have noticed the PU100 is hot, 3.3V is only 1.05V (may vary a bit) and also PD3 is hot.
I firstly removed PC1 (after wrongly mesured a short to ground) => Still PD3 ot.
I replace PC1 (when my mistake discovered) => Still PD3 hot.
I removed PD3 and PR1 (PU100 is fine and I can mesure the 5V and 3.3V correctly), I presume there is a leakage on +RTC_CELL.
So I use BoardViewer 2.0.1.9 (Beta) which is a great tool and cad of...

Re: Dell Latitude E5450 Power Short Circuit

Hello Guys,
After receiveing some new toys (thermal camera and power suplly).
I have injected with power supply 1.2V and the motherboard drained around 5 amps.
With thermal camera I found a bad cap heating near PQ705, once removed with hot air gun, the short disappared and now the motherboard is working again.
I have a donor motherboard to swap badcaps (I have removed also another short circuit on this one but the issue was obvious (cap exploded)) => fixed short circuit but can't use the motherboard because...

Re: Dell Latitude E5450 Power Short Circuit

Hello guys,
Seems we are a lot with the same damn issue with this motherboard (and stock out of spare parts from dell support indicates that this seems to be a bad patch of component).
Whatever I have once with the same issue short circuit, I was able to discover that one component begin to be very hot if I inject some current with stabilized power supply (1.1V and 3Amps) the component is sop8 4435 (PQ700) that begin to be very hot, I have some question regarding the PQ4 that present some strange aspect.
May be the...