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| Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP https://vlab.su/viewtopic.php?f=41&t=88873 |
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| gligurski [ 10 апр 2019, 17:39 ] | |
| Заголовок сообщения: | Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
I have a simple question. The motherboard is LA-9104P. Came to me already messed up bu someone else. There is КЗ (Short circuit - 0.4 Ohms) on the output side of coil Pl500 (VCCP ->+1.05VS) Since the CPU is the only thing that is powered by that power rail, can I be 99% sure that the CPU is fried? I tried to inject voltage on that point (coil removed, board disconnected from ЛБП), but nothing on the board gets heated up. |
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| recordsman [ 10 апр 2019, 18:34 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
hi there! you have short to ground via 1.05V ? VCCP/VDD must be - 1.05V also need to chek and replace TPS51212DSCR IC |
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| gligurski [ 10 апр 2019, 18:44 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
Thank you for your response. Will try it now and share the results later. Edit (I can only send one reply per hour): VCC_CORE (measured at PL701 with coil attached is 6 Ohm). I removed the TPS, found PQ203 and PQ205 КЗ, removed them, now on the same point of VCCP/VDD I have even less (0.3 Ohms). Can it be some capacitor shorted? I'll attach picture now. Afterwards I will remove ISL. |
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| recordsman [ 10 апр 2019, 18:49 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
ok, also must be cheking PU700 ISL95833HRTZ - was two boards with this problem and what is resistance on rail vcc_core ? CPU 1.7 Ohm must be |
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| gligurski [ 10 апр 2019, 19:51 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
Same thing with ISL removed. Resistance on PL701 - 5.9 Ohm PL700 - 3.8 Ohm On the marked place on picture - 0.3 Ohm. |
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| recordsman [ 11 апр 2019, 10:17 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
so remove CPU and try to supply this line from 1 volt to 5 volts slowly (with current under 2 A) and finde overheating details. It's possible to finde some broken ICs and mosfets// |
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| gligurski [ 11 апр 2019, 13:18 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
Yeah, that was what was I referring to when I said injecting voltage. I already did that on that line, but nothing heated up. Although, I was doing that with the processor attached, as it is soldered and I don't have infra-red station to be sure that I can re solder the CPU back with 100% precision. I can re solder smaller chips by hand (even PCH), but not something with > 1000 balls. At this point repairing this board became economically unfeasible, as I found UI circuits (the ones with 8 pins around USB - AP2301MPG) shorted also (removed them) - but the КЗ is still there. I will try few other things and report back, but it looks as this board is going to end up into the donor pile  This is link with a similar problem viewtopic.php?f=41&t=30371 Thank you for your help, it was helpful, I learned a lot from it. Will report if I find something later today. |
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| recordsman [ 11 апр 2019, 14:20 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
yeap in this topik was replaced new IC PU300 and DDR3 plane |
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| gligurski [ 27 апр 2019, 22:57 ] | |
| Заголовок сообщения: | Re: Dell Inspiron 15 (Compal La-9104P) Short Circuit on VCCP |
The board was returned without repair. The thread can be closed now. |
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