Lenovo IdeaPad L340-17IRH - nie uruchamia się

Lenovo IdeaPad L340-17IRH
płyta :
FG541/FG741 NM-C361 rev.1.0

Laptop po podpięciu zasilacza, pobiera prąd 0,040A na chwile załączają się wentylator (ok. 0,30-0,40A) i tak w kółko.
Próbowałem przeprogramować bios z różnych źródeł, niestety bez zmian.
Na podłączonej bateri i zasilaczu widać że bateria jest ładowana (pobór ok 0,7A)

Poniżej napięcia na cewkach z podłączonym zasilaczem, baterią RTC i wypiętą baterią baterii.

PL3201 - 0
PL701 - 0
PL3502 - 5,13V
PL3501 - 3,3V
PL301 - 0,23V
PL503 - 1,06V
PL502 - 1,87V
PL501 - 0V
PL5501 - 1,37V
PL3201 - 1,039V momencie obrotu wentylatorów
PL3001 - 0
PL3002 - 0
PL3003 - 0
PL5804 - 0
PL7501 - 0,8V w momencie obrotu wentylatorów
PL7502 - 0,8V w momencie obrotu wentylatorów

Proszę o pomoc.

Hello!

Does the machine turn off and stay turned off if you hold down the power button for a few seconds?

matic написав:Hello!

Does the machine turn off and stay turned off if you hold down the power button for a few seconds?

does not turn off. it seems like it resets itself over and over again

- Measure the voltages to ground on pins 12, 14, 18, 21, 72, 74, 76, 85, 89, 90, 93, 97, 99, 106, 107, 108, 109, 111, 124, 128 of KBC chip.

- Measure the voltages to ground on pins 86, 110 of KBC chip in the following cases:
a) Power button released.
b) Power button pressed.

On the PQ5810 drain (pin 5-8), I have a short to ground (8 Ohm). Should it be like that ???? If I am to perform a short-circuit test, at what maximum voltage

fifi88 написав:On the PQ5810 drain (pin 5-8), I have a short to ground (8 Ohm). Should it be like that ????

This is not a short circuit. It's just the internal resistance of the CPU and is completely normal.
Please, perform the suggested measurements on the KBC chip.

matic написав:

fifi88 написав:On the PQ5810 drain (pin 5-8), I have a short to ground (8 Ohm). Should it be like that ????

This is not a short circuit. It's just the internal resistance of the CPU and is completely normal.
Please, perform the suggested measurements on the KBC chip.

Whether to make measurements with the RTC battery connected ???

Yes, perform the measurements with the RTC battery connected.

KBC pin :

12 - 1,75v
14 - 3,25v
18 - 0
21 - 0
72 - 1,4v
74 - 3,28v
76 - 3,25v
85 - 3,28
89 - 0
90 - 0
93 - 3,28
97 - 3,29
99 - 0
106 - 3,73v
107 - 0
108 - 3,26v
109 - 3,27v
111 - 3,29v
124 - 0
128 - 3,29v

Pin power button press
86 - 0
110 - 3,26v

Pin power button release
86 - 3,29V
110 - 3,26v


Instead of the power button, I pressed the miroshwitch on the motherboard (recovery)

EDIT :
sorry I misread, measurements without Rtc battery connected

fifi88 написав:Instead of the power button, I pressed the miroshwitch on the motherboard (recovery)

It's not the same thing.
Please, remeasure the voltages to ground on pins 86, 110 of KBC chip in cases "a" and "b".

There are also the jumpers J5 and J6 on the motherboard for diagnostic which simulate the pressing on the power button.

J5 release
86 - 3,29
110 - 3,26

J5 short
86 - 0
110 - 0

Measure the voltage to ground on pin 93 of KBC chip in the following cases:
c) Before pressing to the power button.
d) After pressing to the power button.

PIN 93 KBC
J5 release - 3,28V
J5 short - 3,28V

fifi88 написав:J5 release - 3,28V
J5 short - 3,28V

These are not the cases I asked for.

c) Before pressing to the power button = Machine on stand-by -> J5 opened.
d) After pressing to the power button = J5 briefly shorted for ~1 second and then opened.

matic написав:

fifi88 написав:J5 release - 3,28V
J5 short - 3,28V

These are not the cases I asked for.

c) Before pressing to the power button = Machine on stand-by -> J5 opened.
d) After pressing to the power button = J5 briefly shorted for ~1 second and then opened.

Is same 3,28V.

Sprawdź oporności rezystorów PR2907 (133k) i PR2908 (2M) muszą tworzyć dzielnik 1/16

irysbox написав:Sprawdź oporności rezystorów PR2907 (133k) i PR2908 (2M) muszą tworzyć dzielnik 1/16

These two resistors have nothing to do with the current fault that the machine don't respond to the power button.

The communication between the KBC and PCH chip is missing.
Try to reflash the KBC chip with programmer. Don't forget to save the old dump.

matic написав:

irysbox написав:Sprawdź oporności rezystorów PR2907 (133k) i PR2908 (2M) muszą tworzyć dzielnik 1/16

These two resistors have nothing to do with the current fault that the machine don't respond to the power button.

The communication between the KBC and PCH chip is missing.
Try to reflash the KBC chip with programmer. Don't forget to save the old dump.

I reflash KBC by EC from my bios dump.
Nothing has changed

When I extract the KBC batch from this thread and program with it [html]https://www.elvikom.pl/lenovo-ideapad-l340-17irh-t67783.html?hilit=NM%20C361[/html].

After re-reading the KBC, I still have a batch from my bios. Not the day from the link.

Erase the KBC chip with programmer and then read its content. Check that the read dump is really blank.

matic написав:Erase the KBC chip with programmer and then read its content. Check that the read dump is really blank.

My programmer does not have an erase option. Will programming a file with only FF give the same effect??