lenovo legion 5 15-lmh05 nm-c911 charger problems
Hi guys, well the summary is this:
the equipment arrived because it did not turn on (it had been the original 230w source the problem) then I feed with my regulated source and without wanting to invert the poles. the equipment turned on and turned off.
This damaged the charger and its mosfets both high and low switching.
It also damaged the input mosfet (pq102).
by chance i had another lenovo legion just like this one and i removed the components and tried to turn it on and it turned on but ....... it burned again the high and low mosfets and switch (pq104, pq105, pq103).
The equipment although it turns on, does not charge the battery and does not use the battery. the battery is fine try with another and the same thing.
I did this 1 more time, changed all the components (brought from China) and the same thing happened again.
The only thing that was not damaged was the pu101 (charger) but I plan to change it too.
i leave the measurements without the mosfets pq104 pq105 pq103 pq103 and without pu101
pr103 500k
pr104 4k
pr102 4.7oms
pr118 10oms
pr121 10oms
pr119 “”
pin21 (pu101) -> pr125 (52k) -> pr124 (32k)
-
I proceeded to solder all the components and in the ic I have this diode drop similar to the referenced :
diode - mv
1 480
2 480
3 661
4 699
5 540
6 728
7 551
8 554
9 551
10 528
11 500
12 552
13 gnd
14 510
15 553
16 508
17 662
18 707
19 548
20 552
21 504
22 gnd
23 363
24 546
25 615
26 878
27 538
28 617
I really don't want to burn the new parts, I'm afraid, I don't know what else to measure, on another site they told me to measure pd203 but it is not present on this board.
I leave the schematics and boardview if someone can give me a hand before exploiting everything, Thanks
LINK to schemaics https://www.badcaps.net/forum/troubl...st#post1622418
.
the equipment arrived because it did not turn on (it had been the original 230w source the problem) then I feed with my regulated source and without wanting to invert the poles. the equipment turned on and turned off.
This damaged the charger and its mosfets both high and low switching.
It also damaged the input mosfet (pq102).
by chance i had another lenovo legion just like this one and i removed the components and tried to turn it on and it turned on but ....... it burned again the high and low mosfets and switch (pq104, pq105, pq103).
The equipment although it turns on, does not charge the battery and does not use the battery. the battery is fine try with another and the same thing.
I did this 1 more time, changed all the components (brought from China) and the same thing happened again.
The only thing that was not damaged was the pu101 (charger) but I plan to change it too.
i leave the measurements without the mosfets pq104 pq105 pq103 pq103 and without pu101
pr103 500k
pr104 4k
pr102 4.7oms
pr118 10oms
pr121 10oms
pr119 “”
pin21 (pu101) -> pr125 (52k) -> pr124 (32k)
-
I proceeded to solder all the components and in the ic I have this diode drop similar to the referenced :
diode - mv
1 480
2 480
3 661
4 699
5 540
6 728
7 551
8 554
9 551
10 528
11 500
12 552
13 gnd
14 510
15 553
16 508
17 662
18 707
19 548
20 552
21 504
22 gnd
23 363
24 546
25 615
26 878
27 538
28 617
I really don't want to burn the new parts, I'm afraid, I don't know what else to measure, on another site they told me to measure pd203 but it is not present on this board.
I leave the schematics and boardview if someone can give me a hand before exploiting everything, Thanks
LINK to schemaics https://www.badcaps.net/forum/troubl...st#post1622418
.
