lenovo nm-c362 no power

[madjid911]

Hello, I have a Lenovo FG541 FG741 nm-c362 REV 1 (ideapad l340-15lrh gaming model? I no longer have the label), the laptop does not start at all, I noticed that the controlled micro controler was in short circuit, I ordered one for this pre-programmed model, it is very well welded.

I now find the 3V3, I also have the 5V, but no indicator, no reaction from the laptop, so I reprogrammed the bios via this link https://www.badcaps.net/forum/troubl...-c362-help-plz
but still no reaction

I have 3V3 on the eeprom bios as soon as I plug in the original charger, the battery is indeed 3V, on the other hand it does not charge the battery, I remain at 0V1, so I changed the bq24708S in case it was defective, I had it in stock, but still no reaction.

I don't know where to look anymore, I no longer have any shorts and the voltages seem good from the battery charge, can you help me? THANKS

[madjid911]

maybe the ITE IT8586E is not reprogrammed well? bios EC is in bios eeprom chip or it is in ITE IT8586E for this model?

[mon2]

bq24708S

Share the following voltages from the charger IC:

VCC
REGN
ACOK
ACDRV
ACN/ACP

[madjid911]

Share the following voltages from the charger IC:

VCC
REGN
ACOK
ACDRV
ACN/ACP

APDIN 20V60
ADAPTER_ID 1V8

VCC 20V35
REGN PIN24 6V07
ACOK PIN5 3V3
ACDRV 20V57
ACN 20V60
ACP 20V60

[mon2]

ACDRV is not boosted to ~25v.

Carefully flux and remove PR310 resistor. Do not lose this part.

Then power up again and check the voltage to ground of ACDRV. Now do you see ~25v on this pin?

[madjid911]

ACDRV is not boosted to ~25v.

Carefully flux and remove PR310 resistor. Do not lose this part.

Then power up again and check the voltage to ground of ACDRV. Now do you see ~25v on this pin?

I'm sorry I measured this pin wrong, the ACDRV is at 26V47

[mon2]

Then ok. Measure the voltage to ground of each inductor on the board. Each inductor is linked to a local power supply. Confirm the power rail(s) are present for each stage.

[madjid911]

Then ok. Measure the voltage to ground of each inductor on the board. Each inductor is linked to a local power supply. Confirm the power rail(s) are present for each stage.

PL3501 3V3
PL3502 5V
PL3502 0V2
PL503 0V => I notice a short on PL503 pin 2, I don't see any capacitors in poor condition, I will try to inject voltage to see where it heats up, unless the 32 ohm resistor is normal ?



PL501 0V
PL7502 0V
PL3201 0V

[mon2]

Wait - 32 ohms is fine since this is a low voltage rail. This is normal.

[madjid911]

Wait - 32 ohms is fine since this is a low voltage rail. This is normal.

ok thanks for the infomation, I didn't inject any voltage, I don't see any other problem

[mcplslg123]

Check EC_RST,RSMRST#,LIDSW#

[madjid911]

Check EC_RST,RSMRST#,LIDSW#

EC_RTCRST#_ON 0V
EC_RSMRST# 0V
LID_SW# 3V28

CLK_PCI_EC 1V29

[mon2]

EC_RTCRST#_ON 0V
EC_RSMRST# 0V

These signals means that the EC is parked in RESET mode.

[madjid911]

These signals means that the EC is parked in RESET mode.

do I have to reprogram it? it is very well welded

[mon2]

Not sure but confirm if the EC is being powered @ +3VL_EC. You can check on any of the nearby caps or RE1 / RE3 resistor pads. The resistors are bypassed with PCB traces so should be easier to probe with the meter.

[madjid911]

+3VL_EC is good 3V

[mcplslg123]

What about EC_RST? I didnt asked for EC_RTCRST. They are different.

[madjid911]

Because I can't find anywhere EC_RST, there is EC_RTC_RST# 3V13

[madjid911]

I haven't found how to repair it, maybe the micro controller arrived defective, I bought it on Ali Express

[madjid911]

do you know if I can reprogram the sio chip with my xgecut56 programmer, I also have the CH341A for PS5 uart, and also the lattice hw-usbn-2a ?
I have never reprogrammed sio controler