Lenovo Thinkpad E495 no loading

[danny34]

I did. But isn't pin 83 of UE1 an input?
I didn't fully understand the connection from EC_ON_5V to +3VL_EC which you can see on the right. Unfortunately I can't find this resistor RE7.

[mon2]

Yes. It appears that this signal is hard activated through the RE7 pull-up resistor to +3VL_EC. So upon power up, this signal is parked to a logic '1' which will enable EC_ON_5V to be '1'.

[danny34]

I don't understand it right now...but... I measure on the PU201 at pin 5 (LDO) against ground 1.9 ohms.
The PU201 also gets hot. I just don't understand why I was able to measure 3V there last time. Shortly before I noticed that the PU201 was getting very hot, I was able to measure 5V on the PJ204, i.e. the missing +5VALW. However, only for a short time, then 0V.

The capacitor PC208 is located at PU201 pin 5
(4.7U_0603_6.3V). Unfortunately i tried to measure the capacitance with my multimeter ... OL appears.
The capacitor only has a resistance of the same 1.9 ohms like Pin 5 to Ground.

Is the defect more likely in the compensator or is the PU201 defective?

[mon2]

Flux and remove PC208. After this cap is removed, check if the resistance to ground of this power rail is higher than 1R9 ohms.

[mcplslg123]

Perhaps neith PU201 not PC208 is defective and rather you've a shorted +5V LDO.

Remove both PC208*PU201 and check resistance to GND on +5v LDo again.(Dont put power with PU201 removed).

[danny34]

I unsoldered the PU201 and the PC208. Unfortunately the resistance is still 1.9 ohms to ground

I measured all pins on the UE1 that have 3VL. Pin 26 has 0.0 ohms to ground. At all other pins (50,92,114,121,106,127, ...) it is 2 ohms.
Is it correct that the UE1 (IT8996) is defective? In that case I give up because it needs to be programmed.


By the way: 5V LDO has several k-Ohms to ground

[danny34]

I tried some more here. I replaced the IT8996E with a programmed one.
I have all voltages, so the 3.3V / 5V / 20V / 9V / ...
It also seems to start, it consumes 0.9 amps after starting and continuously.

Unfortunately there is no picture. The +LEDVDD (almost 10V) are there.
Unfortunately the +LCDVDD_CON that comes from U1 is missing.
3.3V arrives at pin 5. Unfortunately there is 0V on the EN pin.
The resistor R3 has 97kohms. No short to GND.
APU_ENVDD_R has direct contact with APU_ENVDD and that comes from the processor.

Is there anything else I can check there, or is my processor broken?

[danny34]

Maybe it helps: The Tab key & Power key lights up at startup.