Hello guys ..i have a problem with Lenovo ideapad 110-15IBR no power..19v is ok..3/5v vl is present..io it8886HE +3vl and +3vl ec is present..rsmrst is not present before and after pushing power button..i flash bios same pb...3/5 valwys not present and not shorting...what i have to sheck too..thank you .
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Re: Lenovo ideapad 110 no power
Thank you ...i think so...not found schematics /boardview ..i m gonna inject Voltage on this 2 rails to see what s happenComment
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Re: Lenovo ideapad 110 no power
This won't help. There is no reason to inject voltage just because a rail isn't working properly. You have to find the reason for a failure and not fight the symptoms. The board won't turn on anyway because PGOOD would be missing.
I'll look for a schematic and get back to you.
EDIT:
I attached the schematic. Took me 3 minutes on google.
+5VALW is generated by PU402
+5VALW_EN (Pin 12) has to be high
5V_VIN (Pin 2..5) has to be around 20V
+5VALW_EN derives from EC_ON_R which has to be high in order to enable PU402 output.
+3VALW is generated by PU401
EN1 (Pin 12) has to be high
+3VIN (Pin 2..5) has to be around 20V
EN1 also derives from EC_ON & EC_ON_R which have to be high in order to enable PU401 output.Last edited by KvnTM; 10-30-2019, 11:03 AM.Comment
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Re: Lenovo ideapad 110 no power
In some cases, 3V/5V ALW rail will come up only after power button press. Not sure about this platform.Comment
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Re: Lenovo ideapad 110 no power
Not quite sure since they are named as always and are controlled by EC_ON. Pretty sure the EC runs all the time since it controls the power button. But your guess is as good as mine...
Im pretty sure he was smart enough to press the power button though
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Re: Lenovo ideapad 110 no power
Ha Ha.Lets hope so.Comment
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Re: Lenovo ideapad 110 no power
PL401 ..black probe on gnd..red on coil..resistance mode = 14.15 kohm
Pl 401...diode mode..red on gnd..black on coil = 0.394v
strange now...+3Alw is present now!!!
0.791v on +5vAlw !Comment
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Re: Lenovo ideapad 110 no power
+3VALW is 3.3v now ?
Give PU401 and PU402 a mild reflow. Looks like a solder connection issue to me if +3VALW is suddenly present. Use lots of flux.Comment
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Re: Lenovo ideapad 110 no power
yes..i give them a mild reflow...3/5Alw is present now...a light on led...but without pushin button there s a current consumation = 0.22 amp...and Pu 402 get very hot.Comment
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Re: Lenovo ideapad 110 no power
Does anything else get hot on the board?
What I would do now: Lift one pad on the inductors and inject 3.3v in the 3ALW rail and 5v in the 5ALW rail. You could also completely desolder the inductor. Inject voltage into the "output" side of the coils. Either something is drawing a lot of current which heats up PU402 or the chip itself went bad and desoldered itself due to the excess heat.
Limit the current to something like 300mA in the beginning to avoid burning a trace on the board!
I bet something is drawing a lot of current somewhere. The output fets are in the chips which would subsequently heat up when there is a big load on the rail. It could also have failed internally.. You can tell after injecting voltage into the rails.Last edited by KvnTM; 11-01-2019, 08:33 AM.Comment
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Re: Lenovo ideapad 110 no power
YEs remove PL402..inject from 1 until 5 v ..no heating and no shorting...3Alw still there...bur the side of indictor from Pu402 = 0.96mv...and the other side 0.780vComment
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Re: Lenovo ideapad 110 no power
Diode mode : from the side of pu402 = 0.399v...the other side = 0.419v
Resistance mode : from the side of pu402 = 3.90mohm....the other side = 19.10kohmComment
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Re: Lenovo ideapad 110 no power
You said that 5ALW was present on PL402 and now it is gone again?
Both sides of the inductor should read about the same voltage. There should be no significant voltage drop across an inductor like this. They have a resistance next to nothing.
Or did you mean 0.96V and 0.78V ? You wrote 0.96mV which would make no sense.
If 5V was present when the chip was heating up extremely and there was no significant current draw while injecting 5V into it replace the chip. It is most likely damaged.
The 3.3V rail is fine now?Comment
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Re: Lenovo ideapad 110 no power
Hold on... I assume you mean PL402? one side is 3.9 milli ohm to gnd or mega ohm to gnd? Did you measure while the inductor is soldered onto the board correctly with both pads?
Or did you measure across the inductor?
You could also make a little drawing or take photos what you are measuring. It is hard to understand what you are doing...Last edited by KvnTM; 11-01-2019, 09:16 AM.Comment
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Re: Lenovo ideapad 110 no power
without inductor..i take the measure after desoldering the pl 402Comment
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Re: Lenovo ideapad 110 no power
Next thing to try would be opening PJ406 with the inductor soldered to the board. This would allow the rail to go to 5V without any load attached to it. Please try that.
PJ406 is a big solder jumper on the board. Looks like a solder blob.Comment
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