Laptop stop working. LA-5891P shematic. Missing B+ voltage, reason was that PC326 was shorted. I removed and try again no powerled star and stop quickly. Then I find out that MOSFET PQ 88 and PQ 92 (TPCA8028-H) was broken so I removed both.
After that without CPU and RAM and any other devices laptop start, leds go on charging working. I measured all PJ voltges:
pj23 0,0V
pj6 3,37V
Pj8. 5,1V
pj11. 19,1V
pj14 1,833V
pj7 0,761V
pj2 and pj4. 0,0 V
pj5. 1,518V
pj9 and pj10 0,08V
pj15 and pj16. 0,0V
pj22. 1,5V
pj20. 1,5V
pj18 19,4V
I need some helposti, what Componenta I have to check before replacing MOSFET?
What is reason that MOSFET blowing?
I find another motherboard some MOSFET what of them I can use I have pair of
FDS6676AS
SI7686DP
79NO3S
4634
What about missing +1.0VSPDGPU and +1.05VS_VTTP. Is it all voltges on or not?
I understand that VGA_ON trigger those two missing voltgess after I reassembling laptop
and start again after all Componenta are installed. I also removed battery from mainboard.
Is it possible yhä GPU or CPU is fault. Laptop running quite cool, GPU temp. is running 50-70 degrees.
When I replace MOSFET next, Is it good idea to try first without CPU, RAM and other components and check voltages again before final assembly.
Please help me soon.
After that without CPU and RAM and any other devices laptop start, leds go on charging working. I measured all PJ voltges:
pj23 0,0V
pj6 3,37V
Pj8. 5,1V
pj11. 19,1V
pj14 1,833V
pj7 0,761V
pj2 and pj4. 0,0 V
pj5. 1,518V
pj9 and pj10 0,08V
pj15 and pj16. 0,0V
pj22. 1,5V
pj20. 1,5V
pj18 19,4V
I need some helposti, what Componenta I have to check before replacing MOSFET?
What is reason that MOSFET blowing?
I find another motherboard some MOSFET what of them I can use I have pair of
FDS6676AS
SI7686DP
79NO3S
4634
What about missing +1.0VSPDGPU and +1.05VS_VTTP. Is it all voltges on or not?
I understand that VGA_ON trigger those two missing voltgess after I reassembling laptop
and start again after all Componenta are installed. I also removed battery from mainboard.
Is it possible yhä GPU or CPU is fault. Laptop running quite cool, GPU temp. is running 50-70 degrees.
When I replace MOSFET next, Is it good idea to try first without CPU, RAM and other components and check voltages again before final assembly.
Please help me soon.
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