Lenovo Thinkpad E560 (BE560 NM-A561 rev1) - Brak reakcji. Zaniżone 3/5V.

Witam.
Laptop Lenovo Thinkpad E560
Płyta BE560 NM-A561 rev1

Laptop nie ma reakcji na power on. Na włączniku jest 3,3V i spada do 0V po przyciśnięciu. Prąd 0,03A.
PL202 - 0V / brak zwarcia
PL201 - 0,42V / 4,5kΩ

Grzeje się PU201.
MAINPWON_EC - 0,53V

PU1:
n.1 - 5V
n.7,8 - 4,5V
n.3 - 0,5V

Termistor PRT7 wymieniony, PR12, PR9 wymienione. Dla pewności PU1.

Raz mi się załączył i działał przez 2-3h po czym wyłączył sam i nie mogłem załączyć. Po wypięciu ładowarki i odczekaniu 20 sekund znowu się załączył i wyłączył po 2-3h. Teraz się nie włącza.

Gdy podam na n.3 PU1 5V przetwornica 3/5V wstaje i podaje napięcia.

Proszę o pomoc.

If there are 3v on pin 5 of PU201 replace PU1.

There is 3V on pin 5 of PU201.
Replaced again PU1.

Still the same situation.

DaCoPL napisał(a):Grzeje się PU201.

How hot the PU201 is?

Measure the resistance to ground on pin 5 of PU201 and on coil PL201.

It is warm. I can easly put and keep finger on it.

PL201 = 4,7kΩ
Pin 5 PU201 = 32kΩ

Open the jumper PJ202 and check, if the PU201 is still hot in this case.

Still warm.
Current on service adapter 0,01A.

Replace PU201.

Replaced PU201.
Still 0,03A after plug in adapter. But when i remove PJ202 short I have 0,01A, and PU201 is not warm.

Inject 3,3V from the laboratory power supply to the power rail "+3VALW" (pin 1 of jumper PJ202). What electrical current flows from the laboratory power supply in this case?
The jumper PJ202 should be opened during the test.

matic napisał(a):Inject 3,3V from the laboratory power supply to the power rail "+3VALW" (pin 1 of jumper PJ202). What electrical current flows from the laboratory power supply in this case?
The jumper PJ202 should be opened during the test.

20mA, and after 3 seconds 15mA.

DaCoPL napisał(a):20mA, and after 3 seconds 15mA.

With such low power consumption the chip PU201 should not be warm.

Connect the ampere meter directly to the jumper PJ202, plug the power supply to the board and measure the power consumption on "+3VALW" power rail when the machine supplies from the main power supply.

matic napisał(a):Connect the ampere meter directly to the jumper PJ202, plug the power supply to the board and measure the power consumption on "+3VALW" power rail when the machine supplies from the main power supply.

0,0275A

Open (cut) the jumper PR205 (picture below) and connect the ampere meter directly to this jumper. Measure the power consumption on "+3VL" power rail when the machine supplies from the main power supply.
The jumper PJ202 should be closed during the measurement.

0,0160A without PJ202
0,05A with PJ202

DaCoPL napisał(a):,0160A without PJ202
0,05A with PJ202

That power consumption seems normal.

Are you sure that you have 30mA (0,03A) power consumption on main 20V power rail when all jumpers are closed without battery connected?

Pretty sure. But multimeter shows more. PU201 have approximately 35 Celsius degrees.

Lower the measuring range on your meter and remeasure the current consumption. You can probably do that with a "RANGE" button on your meter.
If you have any resistor with the value around 470R and power rating of 0.5W or more, you can check if the meter shows the right current.

Checked. Multimeter works perfectly.

Leave the board connected to the power supply for a few minutes ~10 minutes to the temperature stabilize and check, if any other component except the PU201 is warm.
Pay special attention to the KBC chip, LAN controller chip UL1 and small core of the APU hybrid.