Lenovo Yoga 910 Charging Problem

[mon2]

Re: Lenovo Yoga 910 Charging Problem

A nice to have tool here is a usb type c meter. It will offer the power delivery contract selected by the logic board and the current consumption. Each will help to diagnose this fault.

We use the one from RD tools on AliExpress but there are others that may be ok from Amazon.

[Radekqr]

Re: Lenovo Yoga 910 Charging Problem

Thanks for hint

[mon2]

Re: Lenovo Yoga 910 Charging Problem

CCx lines look ok.

[Radekqr]

Re: Lenovo Yoga 910 Charging Problem

Remove all power. No battery. Meter in diode mode.

Red meter lead, yes red to ground. Black meter lead to CC1 in the schematics. What is the measurement?

Repeat for CC2 pin. We are checking to see if the communication interface is damaged or not.

Adapter is working fine with other lenovo laptop.

Red to ground, black to CC1 / CC2 on JP8 connector shows 0.6

Now checking for a faulty usbc socket

[mon2]

Re: Lenovo Yoga 910 Charging Problem

https://www.digikey.ca/short/84hvc8z9
* Should be simple to source from many vendors

https://www.digikey.ca/short/wctpn8vj
* Recommended

Alternative,

https://www.digikey.ca/short/vv903qj5
*100 mA rated but should be ok as well

[sancho76]

Re: Lenovo Yoga 910 Charging Problem

Thanks mate

normally buy from ebay,amazon uk region and Aliexpress when cant find or is too expensive in previous shops.

p.s.

CH520N430GP - can't find to buy

[mon2]

Re: Lenovo Yoga 910 Charging Problem

Diodes Inc offers assorted diodes in this package.

Datasheet for the diode on the logic board is attached.

Any 30v diode with similar specs will work here.

From where do you buy your parts?

[sancho76]

Re: Lenovo Yoga 910 Charging Problem

Hi guys

Lenovo Yoga 910-131KB. Power rail. Can't find datasheet about this probably schottky barrier diodes. Could be for around 25V. Any replacement ideas with DFN1006 standart surface size?

[mon2]

Re: Lenovo Yoga 910 Charging Problem

What are the details of the type c power adapter?

Is it the recommended one for this unit?

Adapter confirmed to be working and able to supply 20v?

If you are stuck at 5v then the power delivery negotiations over the type C connector pins CC1 and CC2 is not working. Fault can be a bad connector; bad adapter or bad communication between the PD sink and PD source.

Remove all power. No battery. Meter in diode mode.

Red meter lead, yes red to ground. Black meter lead to CC1 in the schematics. What is the measurement?

Repeat for CC2 pin. We are checking to see if the communication interface is damaged or not.

[Radekqr]

Re: Lenovo Yoga 910 Charging Problem

Hi!

Bump - anybody solved issue with 5v only and no charging?
I replaced pu10 (was burned) pq 10-11, 15,16, 19,20, 8 (only pq16 was burned), measured all resistors nearby, checked caps - still nothing.

Latop turns on only on battery, not on usbc, and no charging...
No VIN voltage, on PQ10-11 only 5v

Help!

[openminded]

Re: Lenovo Yoga 910 Charging Problem

can anyone add the schematic that has the PQ16 as such in the pdf? mine has U101 there.... Thanks for the explanation BlueMidnight an SSonicComputers.
I tried to replace the ISL9237 which was quite hard . My sorrows continue here:
https://www.badcaps.net/forum/showthread.php?t=86099
join the fun if interested .

[openminded]

Re: Lenovo Yoga 910 Charging Problem

Thanks everyone for all this information, I am trying to learn and fix a 910 too.
The ISL9237 on mine seems fried and I think I can learn a lot from the info posted here.
I do have a question that the original poster had and I did not see answered : where could one insert 19v (with a switching DC power supply) to see if the board will work?
thank you

[Danslaptop]

Re: Lenovo Yoga 910 Charging Problem

BlueMidnight! I have a Lenovo yoga 910 with some kind of board problem. Hoping the shop tomorrow says it's a power board and not the motherboard like the first shop said. Do you do repairs????

[ssoniccomputers]

Re: Lenovo Yoga 910 Charging Problem

For anyone having this problem: Thanks to the help of BlueMidnight in pointing me in the right direction I have isolated and repaired this condiiton on my 910. To date I have seen many others with the same or similar issues with this model with no public account of a successful repair (until now) and it's still a very awesome and sought after unit so it needs to be addressed! He said look to the resistors and mosfets related to the charging/power system first, then the Intersil 9227HRZ controller chip last. The 7 fets involved are all manufactured by Alpha & Omenga semiconductor co. There are 3 AON7405's (PQ-8, PQ-10, and PQ-11), as well as 4 AON7506's (PQ-15, PQ-16, PQ-19, and PQ-20). Methods of testing mosfets can be found here: https://www.google.com/search?q=how+...firefox-b-1-ab Upon testing, PQ-19 was found to have a short between source and gate terminals so was replaced and problem solved! While it may not be the same exact issue in all cases, what is clear is that this model has been well known for having this problem and in most cases it's similar or the same symptom-wise which makes it much more likely to be the exact same failure! Well, hope this info helps some out there


battery only:
PR53: 1.4v
PR57: .2v
PF2001: .05v

battery + AC:
PR53: jumps between 2.3-4v
PR57: 4.5v
PF2001: 5v

Ac only:
PR53: 3-4v
PR57: 4.5v
PF2001: 3.3v


On Mosfets: (these tests are done with the cord plugged in and no battery connected, careful to not touch the wrong thing and short the board.)

Test 1:
Negative to source, positive to drain: should be no voltage in off mode.

Test 2:
Negative to source, positive to gate momentarily then back to drain: should be voltage.

Test 3:
Touch finger between gate and source and it should turn off

Test 4:
Make curcuit with potentiometer and 1k resistor and 10v power supply (10ma max) amp meter in series with drain


Alpha & Omenga semiconductor mosfet tests.

AON7405......:
PQ-8: Test 1: 1.6V both sources Test 2: source 1: 1.6v source 2: 1.6v Test 3: 1.6v out gate, Stayed on
PQ-10: .5 both sources Test 2: source 1: .5v source 2: .5v Test 3: 1.6v out gate, Stayed on
PQ-11 Source 1: .5v, source 2: 0.0v source 1: .5v source 2: .5v Test 3: 1.6v out gate, Stayed on

AON7506....:
PQ-15: Test 1: 0.0v Test 2: .9v coming out gate, when gate charged outputs to drain for 1/2 second then nothing Test 3: same as test 2
PQ-16: Test 1: 0.0v Test 2: voltage out of the gate always, out the drain split second after charge Test 3: same as test 2
PQ-19: Test 1: 0.0v Test 2: same as PQ-16 Test 3: Short between source and gate!!!! [replaced with one off a parts board, SUCCESS!!!!]
PQ-20: Test 1: 0.0v Test 2: same as PQ-15 Test 3: same as test 2

Working on a Lenovo Yoga 910-13IKB, model name 80VF. This unit had liquid damage to the USB C DC in board and ribbon that was preventing it from charging properly when the adapter was plugged in. The unit would sometimes not detect the charger at all, other times it would rapidly cycle from charging to not charging (about every 1-2 seconds) when the adapter was plugged in. There was some corrosion evident the DC in board and ribbon so I replaced them both with a new unit however the same symptoms still persist in the form of rapid cycling between charging / not charging. Clearly there is some component damaged on the motherboard itself however there is no visible corrosion or damage to the motherboard itself.

I have a hot air station and microscope so if I can locate the defective component I can probably replace it but I can't locate any schematics for this board and other than haphazard application of freeze spray in the general vicinity of where the ribbon for the DC in board connects, I'm not sure where to start.

You can view photos of the board below.

Any tips would be greatly appreciated.

[Stevie2001]

Re: Lenovo Yoga 910 Charging Problem

I have read your answer and think that your point of view to repair a motherboard is too strong, which I would say that you think your point of view is the best to fix a motherboard. Depending on the time and money that the technician has to devote to the repair of a motherboard, it depends on the state of the problem that the technician must repair in a satisfactory time for the customer. If you have all the necessary tools to perform a repair, it will not take time to find the problem, but you must know how a motherboard works with all the components. Without this knowledge, the tools will not help you at all.

Like i said you have experience using a hammer but now that the drill has come out technology makes it easy.

[JaroTech]

Re: Lenovo Yoga 910 Charging Problem

Edited 1 reader read it thats enough

I have read your answer and think that your point of view to repair a motherboard is too strong, which I would say that you think your point of view is the best to fix a motherboard. Depending on the time and money that the technician has to devote to the repair of a motherboard, it depends on the state of the problem that the technician must repair in a satisfactory time for the customer. If you have all the necessary tools to perform a repair, it will not take time to find the problem, but you must know how a motherboard works with all the components. Without this knowledge, the tools will not help you at all.

[SMDFlea]

Re: Lenovo Yoga 910 Charging Problem

I`ll get the popcorn

[Stevie2001]

Re: Lenovo Yoga 910 Charging Problem

Stevie2001, No offence meant but it seems you rely too much on repair tools like thermal camera and dc power supply etc etc. Agreed, tools are important but tools alone cant fix anything-its your brain and experience which matters most. tools are just to help you but .......

Edited 1 reader read it thats enough

[mcplslg123]

Re: Lenovo Yoga 910 Charging Problem

Stevie2001, No offence meant but it seems you rely too much on repair tools like thermal camera and dc power supply etc etc. Agreed, tools are important but tools alone cant fix anything-its your brain and experience which matters most. tools are just to help you but .......

[Stevie2001]

Re: Lenovo Yoga 910 Charging Problem

Sadly I ran out of time on this repair and the customer decided to just purchase a new laptop. A few last notes: when I retested with the battery connected the power adapter did output 19.5v, 5v was only with no battery connected.

Thanks for all your help. I suspect given enough time it would have been solvable...

If your seriouse about handling customer repaires without minimum online help effort i suggest you invest in getting flir thermal camera.

With these you can fix shorts and other problems instantly.
Your working hours will be cut and you can get it repaired fast. You will find and locate problematic components soon as you even plug the standard charger.

Bite the bullet get one.