LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV:D

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

i removed PU6 and so now i dont have 3.3v_ALW2
but i can remember also with PU6 , dont hat 3.3v_ALW2

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

What voltage are you getting on +3.3V_ALW2 ,and have you attatched the (good 3V) CMOS battery

yes, also with CMOS battery

[SMDFlea]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

What voltage do you get at the DC-IN connector, pin 5

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

What voltage do you get at the DC-IN connector, pin 5

0v

[SMDFlea]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

0v

0V with the laptop charger ? , if yes then try a different charger. Try starting from a charged battery .

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

i think this 0v ist normal for ID pin because i dont have 3v

There will be no voltage on the ID pin if the 3V switching regulator on the board isn't powered up. And yours won't be since your main power rail isn't working.

[BlueMidnight]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

There are some irregularities with your PU7 measurements that should be checked.

- Pin 4 is designed to be raised ~6V higher than pin 3 to turn on the input FETs, but it's only barely higher. Which means it's not in the off state. But it's not fully in the on state either.
- Pins 1 and 2 should not be higher than pin 3. The exit side of PQ21 shouldn't have a higher voltage than the entrance. Is voltage leaking through from the gate pin?

If these are steady voltages (not jumping around such that the measurements on different pins aren't entirely correlated with each other since they were measured at different moments), then something isn't right in this area. Check for a gate-drain short in PQ21 for starters.

If something like that were the case, then there would be voltage on "VA2", but there would be no actual ability to provide the sort of current the buck regulator needs to operate once it's connected to anything on its output.

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

YEEEES
PQ20 ist short

[SMDFlea]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

i think this 0v ist normal for ID pin because i dont have 3v

Yes, i was looking at the PQ19 area to see if that was pulling the voltage down. I`m glad you`ve got it sorted out .Whats the voltage out of PU6 now is it more than 7V

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

i replaced mosfet PQ20 and now i have 3.3v and 5v and when press start button , i can see that led blinking for 1 sec and shutdown
i think have short circuit.
any idea ?

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

i checked all line voltage, without short circuit

[BlueMidnight]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

Well that's progress at least. It couldn't hurt to measure PU7 pins 2,3,4 again.. just as a sanity check to make sure everything looks 100% okay there.

But also, make sure you check the power rails both before and after the load switches. For example, +3.3V_DSW becomes +3.3V_RUN, but only when PQ7 turns on. Likewise, +5V_ALW goes through PQ15 to become +5V_RUN. Etc, etc. There can be a short on one of those switched rails, and the board doesn't freak out until it actually tries to turn on the load switches.

This is also about the time the system firmware would come into play. There are a bunch of other possibilities really.

when i received this laptop ,i found a bad capacitor , i removed it

Out of curiosity, which capacitor was this? The capacitor, the FET, and now something else seem to be bad. To narrow down the problem, it's worth thinking about how these things might be related.

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

Well that's progress at least. It couldn't hurt to measure PU7 pins 2,3,4 again.. just as a sanity check to make sure everything looks 100% okay there.

Pin4 = 26V
Pin2 ,3 = 20v

But also, make sure you check the power rails both before and after the load switches. For example, +3.3V_DSW becomes +3.3V_RUN, but only when PQ7 turns on. Likewise, +5V_ALW goes through PQ15 to become +5V_RUN. Etc, etc. There can be a short on one of those switched rails, and the board doesn't freak out until it actually tries to turn on the load switches.

for test, i removed PQ7 and PQ15
ist same, LED blinking and after 1s shutdown

Out of curiosity, which capacitor was this? The capacitor, the FET, and now something else seem to be bad. To narrow down the problem, it's worth thinking about how these things might be related.

PC136 war defect complete

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

this voltag ist normal ?

[BlueMidnight]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

Testing for a short to ground on both sides of PQ7 and PQ15 is enough. Obviously, it won't want to turn on without them.

When the board wants to read the AC adapter type, it has to turn on PQ19B. To do that, it needs to turn off PQ19A. To do that, ADAPTER_ID has to be 0V. But it only needs to do that when it wants to determine the type.

The 2 component failures do seem related at least. When the capacitor shorted, it could have cause a current/voltage pulse that damaged the FET. The other capacitors in that area would be an obvious short, so they are probably fine. PQ21 seems to be turning on okay so far. PQ13 too.

So maybe PR102 could have been damaged by excessive current. If its resistance has increased slightly, the board might think there is too much current flowing and shut down.

But there isn't much else in that area to go bad without noticing it easily. So the problem might be elsewhere.

What happens if the board is turned on with battery power only? (assuming you have the battery and it has enough charge) And if the AC adapter and battery are plugged in together, does it charge the battery?

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

So maybe PR102 could have been damaged by excessive current. If its resistance has increased slightly, the board might think there is too much current flowing and shut down.

+PWR_SRC ist ok (equal 9V) and ist stable even when press start button.
and also +3.3_DSW and +5v_ALW ist fix even when press start button.
but i can see with start button, that +3.3v_RUN and +5V_RUN function but after 1s shutdown

But there isn't much else in that area to go bad without noticing it easily. So the problem might be elsewhere.

i think ist elsewhere

What happens if the board is turned on with battery power only? (assuming you have the battery and it has enough charge) And if the AC adapter and battery are plugged in together, does it charge the battery?

ist same also with battery
yes, it can charge battery perfect

[BlueMidnight]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

Yeah, it does seem to be elsewhere. Try measuring HWPG (U20 pin 124) as you are trying to turn it on. Does it ever go high?

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

after turn on motherboard, i can see 3.3v and after 1s null
Edit :
with and without PQ7 & PQ15 ,behavior is same

[BlueMidnight]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

It is actually getting really far along then. Does PLTRST# go high to turn on the CPU as well? (the only place to measure this is CN14)

[kokono]

Re: LENOVO U330 DA0LZ5MB8B0 Quanta LZ5 REV

It is actually getting really far along then. Does PLTRST# go high to turn on the CPU as well? (the only place to measure this is CN14)

No. all time ist null