LEGION Y530-15ICH - Starting out

[ODSB]

Hello all! I recently picked up a broken legion y530 just for the fun of the repair.
For motherboard repair, I am definitely a newbie, but I have always wanted to attempt it.
These are the steps I've taken and what I've found so far. All images attached are relevant to the board.

-Machine does not power on. Light does not turn on when charger is plugged in. The charger is brand new and was not included with the laptop.

-Laptop disassembled. Board removed. Power cable was not in all the way for one. Found a drill bit (for going through wood/metal- four inches long) on one side of the Motherboard. Found something charred on that side, I think a transistor?

-I put it under a microscope for better visual, and attached it to this post.

-I did a multimeter test, that charred piece appears to be grounding out on all three sides.

-That charred piece is known as q121, two for leds, and one for ground

-I partially reassembled the laptop and plugged it in. I looked through a thermal monocular, and noted that a spot on the motherboard was hot. Still no light or power on when reassembled again.

I was curious if anyone knew what that charred piece is. Additionally, I performed a ground check on all of the areas listed on Tikanot's thread.
Here are the values I got. I realize the power rail is good, so the others might be meaningless, but I figured I should post them anyways.


PR201 - PR201:.000
PR201 - GND: No contact.
PL601:.416
PL602:.001
PL201:.495
PL1401:.379
PL3102:.004
PL2101:.001
PL1801:.074
PL5802:.001
PL5801:.002
PL5803:.001
PL901:.047
PL3201:.014
PL3011:.001
PL3001:.002
PL3002:.001
PL3003:.001
PQ601:.379

What would be the next recommended course of action?
Thank you!

[mon2]

Re: LEGION Y530-15ICH - Starting out

Q121 = pja138k

[Sephir0th]

Re: LEGION Y530-15ICH - Starting out

The coil measurements are confusing me since it isn't clarified neither the mode nor the range. Is this diode mode to GND?
Better use Ohms mode here since it can be compared better.

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Q121 = pja138k

Thank you, I will begin looking into replacement mosfets.

The coil measurements are confusing me since it isn't clarified neither the mode nor the range. Is this diode mode to GND?
Better use Ohms mode here since it can be compared better.

Sorry about that, I did a diode check on all of those, so that was in voltage according to the INNOVA 3320 multimeter I'm using.
The resistances (in OHMs) are as follows:

Side to side, resistance check in OHMS
PR201 - - .2
PR201 - No contact. -
PL601: -.1
PL602: - .3
PL201: -.3
PL1401: - .1
PL3102: -.1
PL2101: - .2
PL1801: -.2
PL5802: - .2
PL5801: -.2
PL5803: - .1
PL901: -.2
PL3201: - .2
PL3011: -.2
PL3001: - .2
PL3002: -.2
PL3003: - .2

[Sephir0th]

Re: LEGION Y530-15ICH - Starting out

I think that's the time to tell that ALL measurements has to be compared to GND and NOT to the second pad of the coil (same for diode mode btw).

Just saying, because the only thing we can assume from that is that the coils are good but we can't assume anything about the health of the power rails.

Regards

[ODSB]

Re: LEGION Y530-15ICH - Starting out

I think that's the time to tell that ALL measurements has to be compared to GND and NOT to the second pad of the coil (same for diode mode btw).

Just saying, because the only thing we can assume from that is that the coils are good but we can't assume anything about the health of the power rails.

Regards

Understood, sorry about that.
Here are the values for the Resistance checks:

Side to board ground, resistance check
PR201 - PR201: .3 ohms
PL601: - 18.6 K ohms 1R5-843-C4K
PL602:- .5 ohms 1R5-831-PR4
PL201: .6 ohms 4R7-842-CDK
PL1401: -Hovers around 143.0 ohms R68
PL3102: -Hovers around 7.0 ohms R150 V01F
PL2101: - 1.2 ohms R68
PL1801: -Hovers around 154.0 R47
PL5802: - 1.3 ohms R22
PL5801: - 1.4 ohms R22
PL5803: - 1.4 ohms R22
PL901:- 67.6 ohms 1R0-823-VC4
PL3201: - 3.1 ohms R150 V01F
PL3001: - 3.2 ohms R150 V01F
PL3002: - 3.1 ohms R150 V01F
PL3003: - 3.2 ohms R150 V01F

PL 1401 worries me.

[mon2]

Re: LEGION Y530-15ICH - Starting out

Can you confirm on how you are measuring these parts ?

To check, for example, PR201 is a current sense resistor.

One meter probe should be to the pad on the part. Other meter probe to ground (shield is ok).

After the above, the resistance on the meter is reading @ 0.3 ohms ?

That is a direct short to ground so does not look correct unless there is a shorted cap on this power rail.

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Can you confirm on how you are measuring these parts ?

To check, for example, PR201 is a current sense resistor.

One meter probe should be to the pad on the part. Other meter probe to ground (shield is ok).

After the above, the resistance on the meter is reading @ 0.3 ohms ?

That is a direct short to ground so does not look correct unless there is a shorted cap on this power rail.

Sorry about the misunderstanding, the PR201 measurement in my last post is from the left side of the pad to the right side, essentially over the component.

For all of the other components, I got a reading from either side of the soldered component, to a copper ground spot on the board.

For the PR201 to ground, I got:
Resistance Check: PR201 to ground - 57.3 K ohms.

[mon2]

Re: LEGION Y530-15ICH - Starting out

Ok - so that leg is NOT shorting to ground. Good.

Perhaps a good idea to review your resistance readings again and post an updated list for a review. Some others are quite low in the list as well.

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Ok - so that leg is NOT shorting to ground. Good.

Perhaps a good idea to review your resistance readings again and post an updated list for a review. Some others are quite low in the list as well.

Alrighty, just finished with this. I changed up and used my fathers Fluke 115 for more accurate results.

Side to board ground, resistance re-check - With Fluke 115 RMS Multimeter
Board ID#____Pin 1_________ Pin 2__________Component name
PL601:----------3.69 K ohms-----3.69 K ohms-----1R5-843-C4K
PL602:.............0.6 ohms.......... 0.6 ohms...........1R5-831-PR4
PL201:----------1.488M ohms---1.486 M ohms----4R7-842-CDK
PL1401:...........141.5 ohms......141.4 ohms........R68
PL3102:---------6.7 ohms--------6.7 ohms---------R150 V01F
PL2101:...........0.9 ohms..........1.0 ohms..........R68
PL1801:---------143.9 ohms-----143.7 ohms------R47
PL5802:...........1.0 ohms..........1.0 ohms...........R22
PL5801:---------1.0 ohms--------1.0 ohms---------R22
PL5803:...........1.0 ohms..........1.0 ohms...........R22
PL901:----------71.6 ohms------71.6 ohms--------1R0-823-VC4
PL3201:...........21.8 ohms.......21.8 ohms..........R150 V01F
PL3001:---------2.8 ohms--------2.8 ohms--------R150 V01F
PL3002:...........2.8 ohms..........2.8 ohms..........R150 V01F
PL3003:---------2.8 ohms--------2.8 ohms--------R150 V01F

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Additional note: plugged in board, and looked at the thermal. Noticed a hot spot near keyboard ribbon cable plug in. Found out that PJ604 is getting a full 20v and heating up.

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Additional checks this week:

-Checked near the previously mentioned PJ604 jumper. 20v goes in, area gets hot. The hottest spot on the board is at U132, on the other side.

-Near PJ604, is mosfet PQ603. 20v goes into one side, but no voltage goes out through the other pins on the fet. Expected 5v according to the schematic. Potentially bad? Or does this mosfet rely on something else being on before it can reduce voltage?

-PR3103 and PR 3108 are not grounding on one side. I cannot tell from the schematic or boardview if they are supposed to be.

-There is black stuff on the board in random spots. Especially on CC178 and 175, both have it all over them. Not sure if this is harmful. Picture attached.

Also, I was curious as to one of my previous posts. The resistance on PL1401 is high, and out of the specs I looked at, it can even be compared to PL2101, as that is the same part number, so this may need to be replaced, correct?

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Noted today that PC629 and PC630 are showing continuity with ground on both sides. Should this be like that? These areas all heat up incredibly, but have no voltage to them.

I also noted that PR605 and PC634 have 4.7v going through them, when the board viewer says they should only have three. They heat up significantly.

Also detected that PU601 and PU602 are grounding out on the +3v_LX line.

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Got a hot air station and a replacement pu602 mosfet. Replaced the pu602 mosfet, and now the boards charge light comes on when connected. Re-assembled, but it didn't power on. I noted that the main power rail goes up to p201 (has 20v), but not to pq202(no power). Now, Pu602 doesn't have power either. Will keep playing with it.

[ODSB]

Re: LEGION Y530-15ICH - Starting out

Welp, ordered some new mosfets to replace PQ202 and Q121. Replaced them both, and plugged in the charger. The charging light was blinking. Nothing was really going on. I hit the power button on the laptop, nada. Squirted some 91% isopropyl alcohol on the board on several location, and I heard a ticking noise.

About 5 seconds later, PQ601 BURST into flames. I just watched it for a few seconds, before I unplugged and blew it out. Used the hot air station and tried to desolder the smoked mosfet, but it looks like the bottom plate fused with the solder on the board. Also looks like a small layer of the board came up too.

Re-plugged in the charger, and now pq202 has 20v, and everything else does that did before. That blown pq601 also has 20vs on its bare spot. I think this one is over though, unless someone thinks otherwise.