Toshiba C660-2DV dead

[DeniS182]

Hi all,
I have this laptop - completely dead, no lights. One of USB port missing and second was shorted, I removed shorted usb port. VREG3 and VREG5 are present. Bios pin 8 - 0V.
PU330 - TPS51125 heat little bit. EN0 -3.3V
I tried change pu330.

Any idea please? I can't find the problem. Thanks!

[ktmmotocross]

Re: Toshiba C660-2DV dead

usb is driven by 5V line by the switching mosfet from that line. so chceck 3,3V and 5V line for short and find that usb switching mosfet and check its output for short

[DeniS182]

Re: Toshiba C660-2DV dead

I checked switch U14 -RT9715BGS_SO8 and there isn't any short on IN/OUT pins - after shorted usb was removed.

[ktmmotocross]

Re: Toshiba C660-2DV dead

what about 3,3V, +3VLP and 5V output of PU330. check for short and for voltage

[DeniS182]

Re: Toshiba C660-2DV dead

+3VALWP and +5VALWP - no voltages, no shorts
+3VLP -3V

[ktmmotocross]

Re: Toshiba C660-2DV dead

check all 4 output mosfets for short

and better check all pins of PU330 for voltages. wrote it to schematic for better understanding

[DeniS182]

Re: Toshiba C660-2DV dead

PU330

1. 0V
2. 0V
3. 2V
4. 2V
5. 0V
6. 0V
7. 0V
8. 3.3V
9. 4.6V
10. 0V
11. 0V
12. 0V
13. 3.3V
14. 2V
15. 0V
16. 19V
17. 5V
18. 0V
19. 0V
20. 0V
21. 0V
22. 4.6V
23. 0.4V
24. 0V

Mosftets are not shorted.

[ktmmotocross]

Re: Toshiba C660-2DV dead

damn that's confusing. looks like all is ok.

[DeniS182]

Re: Toshiba C660-2DV dead

Really weird. Maybe my chip is dead because I replace it before I found short on usb.. and this chip is from another board, not new.. i check mosfets out of the board and all are good.

[on/off]

Re: Toshiba C660-2DV dead

Make sure there is no shorted, Then check component PQ361 and resistor2 nearby.
Should be the value on gate of PQ361 be High (approx 5V). The purpose to avoid Entrip Signal grounded by trigger VL voltage.

[DeniS182]

Re: Toshiba C660-2DV dead

My problem is in PU1 G718TM1U - pin 3 - OT1 - VS_on shorted to ground - 5ohm.
after I removed chip I have +3VALWP and +5VALWP voltages and power led is on.

[ktmmotocross]

Re: Toshiba C660-2DV dead

Make sure there is no shorted, Then check component PQ361 and resistor2 nearby.
Should be the value on gate of PQ361 be High (approx 5V). The purpose to avoid Entrip Signal grounded by trigger VL voltage.

damn u r right. i didn't read whole TPS datasheet. i was thinkung that entrip must be high to be enabled, but datasheet says short to ground to disable channel