Repairing Lenovo Yoga not turning on

This weekend we have this lovely Lenovo Yoga laptop which had an unexpected problem. It went to sleep and never woke up.

Lenovo Yoga won't turn on repair
Lenovo Yoga won’t turn on repair

When the power button was pressed there was no response from the laptop, neither there was a charge on the Lenovo laptop charging port.

Repairing No charging light on Lenovo Yoga
Repairing No charging light on Lenovo Yoga

We were expecting to find terrible corrosion on the motherboard or faulty charger which may have shorted a power chip on the board. But this was a different case. A case which we haven’t seen in quite a while.

The way how modern laptops are designed these days is to reduce components on the motherboard. And the way how they can achieve this is to rely on more complex IC chips which holds multiple modules and only need a small number of passive components around them to customize them for the particular configuration.

Not turning on Laptop repair service we offer here in Adelaide includes a couple of simple steps:

  1. Get a Quote for the repair before any work is done, even over the phone.
  2. Free pick up from the client’s location in Adelaide. Or alternatively, drop in for a quick check while you wait.
  3. Confirming final cost and “Go” from the client.
  4. Repairing and ensuring everything works as expected.
  5. Returning repaired system back to the client. Or the client can pick it up from our workshop.

We start measuring voltages going into the system and was hoping that it is a simple broken charging port. But quickly we identified that power reaches the system, which eliminated faulty power jack.

Power jack on Lenovo Yoga won't turn on repair
The power jack on Lenovo Yoga won’t turn on repair

The customer was next to us when we narrowed the issue to motherboard related. We have quickly informed her of what we need to do in order to repair it and gave a quote on the spot.
Although this laptop was 3 years old and quite beaten up, the customer knew that she needs to spend 3 times the repair to buy a new one. And rather buying another laptop which may experience this problem out of the blue, she decided to save some money and also contribute to the environment waste reduced by having hers repaired.

Measuring through the components of the Lenovo motherboard
Measuring through the components of the Lenovo motherboard

We start working on it straight away. Expected 5V line voltage was not produced from the voltage divider. Having the schematic of this model was very useful and from experience, we knew that capacitors on budget laptops are not of the best quality and they fail quite often.
However, to find which one out of 100 capacitors on the same trace is shorting was finding a needle in a haystack. So we start chasing the rabbit down the holes to figure out which capacitor was shorting.

Injecting voltage to the 5V voltage regulator of Lenovo Yoga
Injecting voltage to the 5V voltage regulator of Lenovo Yoga

We had to inject voltage to the system in order to determine where the short is. This is a technique allowing high current with limited voltage to go through the component with the lowest resistance. A component which has the lowest resistance will pass through the current first and faster. And when that component is a capacitor, that current will rush to go straight to ground causing a short.

We have sophisticated equipment in our workshop with high accuracy microscope, ultrasonic cleaning bath, reflow machine and tools for micro soldering to achieve high-quality logic board repairs. With hundreds of components in stock, we can quickly locate and replace faulty chips, resistors, and capacitors in Macbooks.

Injected voltage showed that the 5V line was pulling more than 3A current when the laptop even wasn’t turning on. This was clear that there is a short on filtering capacitors. Their purpose is to smoothen the voltage ripples and ensure stable voltage.

A faulty capacitor on not turning on Lenovo Yoga motherboard
A faulty capacitor on not turning on Lenovo Yoga motherboard

Once we identified the capacitor which was heating up like a light bulb, we desoldered it and measured it outside of the motherboard.

Desoldering filtering capacitor causing short on Lenovo Yoga motherboard repair
Desoldering filtering capacitor causing short on Lenovo Yoga motherboard
Measuring shorting capacitor on laptop repair case
Measuring shorting capacitor

Measuring the capacitor showed immediate short and very low resistance which was causing that high current drainage.

We have thousands of components in stock and by the time we identify the problem, as long as we have the components in stock we can replace it.

Replacement capacitors of laptop motherboard
Replacement capacitors of laptop motherboard

Locating a replacement capacitor was easy, due to our big component stock. Soldered it back to the faulty one’s place. These are 602 package SMD capacitors. smaller than a rice grain. Soldering them on a motherboard requires high heat of about 400*C and a steady hand.

Finishing touches to the replaced capacitor
Finishing touches to the replaced capacitor

Once short removed from the board, the voltage regulator starts producing 5V output as expected and allows the laptop to turn on

A repaired motherboard on Lenovo Yoga with a spinning fan
A repaired motherboard on Lenovo Yoga with a spinning fan

The last step was to assemble and test the laptop. We ensure that all Lenovo repairs run functionality tests and overnight streaming tests to ensure the stability of the laptop.

Repairing this Lenovo Yoga was a breeze, we are so used to repairing liquid and water damaged Macbooks, that a repair like this brought a fresh breeze to our workshop.

Repaired Lenovo Yoga which had a short circuit
Repaired Lenovo Yoga which had a short circuit

Do you need Lenovo Repair service in Adelaide?

If you have Laptop or MacBook causing troubles and need a Mac repair service in Adelaide, give us a call and we will advise for the best scenario to get your Lenovo repaired.

We at IT-Solve, specialize in computer and electronics repairs. And we will do our best to repair your Computer quickly without involving high costs and long waiting times in repair shops.

Call us now on 0469317177 or drop us an inquiry through our contact form or support @ it-solve.com.au – Our engineers will respond quickly to your inquiry.