Recently, we received a laptop from a chengdu fan who wanted to save y9,000p 2023. According to the fans, shortly after the computer had passed warranty, during a normal operation, the fuselage suddenly passed out, followed by a complete power outage and was unable to turn on。
United saver y90000p main board maintenance
After first contacting the official sales, the fans were told that the official policy was “to change and not fix” and that the cost of replacing the main board was up to $45,000. He then consulted with the maintenance shop near his home, where he examined the machine and stated that the main plate had been badly burned and had no maintenance capacity, and that it was likewise recommended that the main board be replaced. Just as we were about to give up, the fans found us through a web platform — a shop focused on repairing the saver series. After reviewing the large number of successful maintenance cases we shared, he decided to send a final test。
United saver y90000p main board maintenance
Calm down and check
According to the viewer's description of "sweety, unwieldy" we judge that the main plate has severe short circuits. In order to avoid secondary damage, direct electrical access is strictly prohibited and decomposition tests are conducted directly. Following the removal of the main plate, the smell was clear, and the problem was quickly detected by a visual inspection: a power management chip that powered the main plate of the south bridge chip and one of the filtering caps around it had been severely burned。
United saver y90000p main board maintenance
The earth-to-ground resistance of the associated circuits is measured using a universal meter, and fortunately, the core south bridge chip itself does not have short circuits, which means that there is great hope for repair。
Fine fix, like thin ice
When the burnt chip was removed, we found the failure deeper than expected: the strong burning caused the chip welding line on the main plate to be broken. This requires that the repairs do not stop at simple change chips。
First, we make patches to damaged welders, fly-line connections and solidified with insulation green oil. Subsequently, the completely new power chip identified was replaced. In order to ensure that there is no loss, a key step has been taken: instead of connecting the subsequent circuit, the new chip will be tested separately for upscaling, confirming that its output voltage is accurate and stable, and eliminating the risk of burning expensive south bridges due to voltage anomalies。
United saver y90000p main board maintenance
We're not going to restore the circuit until we verify that the power supply is normal. Once again, the current meter shows a familiar normal jump. Connect to the screen, try to signal the logo as it is scheduled! Then complete assembly and full-dimensional functionality tests are performed, all running as usual。
Summary of maintenance: selection of professional versus value for money
The failure of the main board of section y90000p 2023 was rooted in the burning of the power chip on the power supply road on the south bridge and the associated damage to the perimeter component and the pcb line. With in-depth knowledge of the main circuits of the saver series, factory-level drawings (wire and dot maps) and fine chip-level maintenance techniques, we have been able to locate and successfully repair the failure。
