19V to 3.3,5v regulator, nothing out

[p1muserfan]

Have a Quanta Z09 board from an Acer that suddenly wouldn't start after sitting on my bench for a week. I have 19V to the chip (PU1, pin 16) but nothing out (I need 3.3v out of pin 8 and 5v out of pin 17, correct)? I removed the chip and pins 14 and 15 on the board are short to ground (15 is in fact a ground pin). Is it a bad chip or is pin 14 being short messing up the works?

[budm]

Re: 19V to 3.3,5v regulator, nothing out

What page of this PU1 CI is in?

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

What page of this PU1 CI is in?

Page 32

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

Was bad chip, replaced, now have 3.3 and 5v back. Have power to KBC. Have 3v at power button and it drops to 0 when I short it but no 3v at rsmrst pin on KBC. Chip change?

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

Anybody? Is there anything else I can check to confirm whether it's the KBC or not?

[fddizon]

Re: 19V to 3.3,5v regulator, nothing out

try reflash bios

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

try reflash bios

I think it worked. When I pushed the start button on the daughter card the blue light came on but before the fan started to spin the audio chip on the daughter card blew. I would start the board manually but I'm not sure which pins to short on cn13 (p. 19).

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

I think it worked. When I pushed the start button on the daughter card the blue light came on but before the fan started to spin the audio chip on the daughter card blew. I would start the board manually but I'm not sure which pins to short on cn13 (p. 19).

Board starts just fine with daughter card with audio chip removed

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

Success was short lived, board cut off while running for a few minutes. Didn't short out, still have 3.3 and 5 volts at regulator but not at coils or voltage at KBC. Have no idea what to do next...

[fzabkar]

Re: 19V to 3.3,5v regulator, nothing out

I don't understand. Are you saying that you still have +5VPCU and +3VPCU at PU1 but not at coils PL1 and PL4 (2.2uH)? If so, then I can't see how that could be possible.

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

I don't understand. Are you saying that you still have +5VPCU and +3VPCU at PU1 but not at coils PL1 and PL4 (2.2uH)? If so, then I can't see how that could be possible.

Yes, that's what I'm saying, I don't get it. Have voltage on the following pins of PU1:
3-2v
4-5v
8-3.3v
9-4.7v
13-5.6v
16-19v
17-5v
18-3.3v
22-4.9v

[Joseph cauchi]

Re: 19V to 3.3,5v regulator, nothing out

Sorry but can you explain what is daughter card and how to use it.
Thank you

[fzabkar]

Re: 19V to 3.3,5v regulator, nothing out

I see what you mean.

The VREG5 and VREG3 supplies are the IC's internal 5V and 3.3V linear regulators whereas the +3VPCU and +5VPCU supplies are generated by the IC's SMPS PWM Buck Controllers. Both enable pins (EN and ENC) are active, so all four supplies should be running. However, it appears that only the linear regulators are working.

Are there any short circuits on the 3VPCU or 5VPCU supplies?

RT8223P, Richtek, dual step-down, SMPS controller plus 5V/3.3V linear regulators, 6V to 25V input, 2V to 5.5V output:
https://cdn.badcaps-static.com/pdfs/...315d8d2e1c.pdf

[p1muserfan]

Re: 19V to 3.3,5v regulator, nothing out

I changed the 3.3,5v regulator chip and now the board powers again. Maybe it's something I'm doing wrong. When the board died I had put it in the laptop shell because I wanted to connect and use the keyboard. But I didn't secure the board in the bottom case with screws and therefore the board wasn't grounded?