Lenovo IdeaPad s340 burned motherboard ?

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

just measure rezistance on both side of capacitors to ground.

if u dont have ram inserted and laptor start, than u must have ram on board, so try to remove inserted ram

check if u have 1.2V on pl502

I just remember that this pc has 4gb of ram integrated on the motherboard (i don't know where), so you are right.
i'll check the other voltage and components

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

just measure rezistance on both side of capacitors to ground.

if u dont have ram inserted and laptor start, than u must have ram on board, so try to remove inserted ram

check if u have 1.2V on pl502

i just find out that 1 capacitor was shorted, so i solder it again and........ it turn on!!!!!
But There is a big problem: the temperature!
When i turn the pc on, the fan started normally and after 1 sec it stop.
I waited until the login screen (about 4 seconds) and the ssd and the black heatsink become very hot.
What can i do?

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

No one know?

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

did it turn off from heat when u let it run?

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

did it turn off from heat when u let it run?

I turned it off manually because it got too hot...
i have a bit of fear to burn it totally

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

dont havefear. if it gets too hot it shut down itself.

maybe it is programmed to start fan when hot. chips can withstand heat that burn your finger normally

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

did it turn off from heat when u let it run?

do i have to let it on and see what happen?
Do i risk to burn everything?

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

dont havefear. if it gets too hot it shut down itself.

maybe it is programmed to start fan when hot. chips can withstand heat that burn your finger normally

sorry, i just read you replay... i hope that it's not burn the temperature sensor or something like that and it wont turn off

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

no. every big chip/cpu, GPU, NB/ have inside sensor

check if u dont have bend heatpipe

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

no. every big chip/cpu, GPU, NB/ have inside sensor

check if u dont have bend heatpipe

In the first image you can see the heatpipe in red and the very hot point in green.
Now i'm waiting for a capacimeter from amazon to measure the capacitor (do you know some other way to measure with a normal multimeter?) because.... i burn the first one near the pl501....
I need another capacitor (the one in the second image)

Every time a move sometring, the situation gets worse

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

that green points is GPU, CPU and SSD controller. offcourse it is hot. just check if side of heatpipe near fan gets warmer

u dont need capacitor meter. just replace all three capacitors. it is cheaper

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

that green points is GPU, CPU and SSD controller. offcourse it is hot. just check if side of heatpipe near fan gets warmer

u dont need capacitor meter. just replace all three capacitors. it is cheaper

can i replace che three capacitor with some other random capacitor of the same size? (like i did with the PL501)
do i need to check some value?

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

u have schematic with values

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

u have schematic with values

yep but i can't measure che capacity of the other capacitor (because i'll take the capacitor from another board but i can't measure their value)

I'm sorry for making you waste all this time but.... can you tell me the value?
I don't know how to find it in the schematics.
I feel so stupid, but i'm learning!

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

on board u see that capacitors is connected just after PL502. in schematics u see that it is 22u /microfarrads/ 6.3V

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

on board u see that capacitors is connected just after PL502. in schematics u see that it is 22u /microfarrads/ 6.3V

thanks for the replay, I didn't think those were the capacitors because they are 6 in the schematic (and i have only 3 capacitors).
but ok,i'll find the capacitors and relace them!

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

oh my god. dont u think that the other three can be on other place on board? it is schematic not boardview

if u want to see others three find boardview

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

oh my god. dont u think that the other three can be on other place on board? it is schematic not boardview

if u want to see others three find boardview

I know the other capacitors may be elsewhere, but I wasn't sure...
Now l'am looking for capacitors on other motherboards

[Mike94990]

Re: Lenovo IdeaPad s340 burned motherboard ?

oh my god. dont u think that the other three can be on other place on board? it is schematic not boardview

if u want to see others three find boardview

i'm here again with some update: i can't find anywhere that capacitor 22 microfarrads, 6.3V), i check the schematics of 10 old motherboard and.....nothing.
So i try something (maybe very stupid, i don't know): i turn it on with 2 capacitors (not 3) and it seems to be working well.
i check the temperature:
-ssd m2: 66/68 degrees Celsius (misured with Hard Disk Sentinel)
-CPU: core0 -> 57 degrees Celsius
core1 -> 59 degrees Celsius
core2 -> 72 degrees Celsius
core3 -> 56 degrees Celsius
(misured with speedFan).

I'm worried about the ssd and the core2...
The other temperature are normal?
What do you think?

[ktmmotocross]

Re: Lenovo IdeaPad s340 burned motherboard ?

i'm here again with some update: i can't find anywhere that capacitor 22 microfarrads, 6.3V), i check the schematics of 10 old motherboard and.....nothing.
So i try something (maybe very stupid, i don't know): i turn it on with 2 capacitors (not 3) and it seems to be working well.
i check the temperature:
-ssd m2: 66/68 degrees Celsius (misured with Hard Disk Sentinel)
-CPU: core0 -> 57 degrees Celsius
core1 -> 59 degrees Celsius
core2 -> 72 degrees Celsius
core3 -> 56 degrees Celsius
(misured with speedFan).

I'm worried about the ssd and the core2...
The other temperature are normal?
What do you think?

all cores have literallly same temp because it is on same chip. its just bad reading. that capacitors must not be there but u can have some instability so better add capacitors with same size.