HP 4510s power problem

[Dr.Spiegel]

Hello guys, i see lots of you got really lots of knowledge, so i hope somebody can help me with my notebook.The problem is that i try to switch it on, but after pushing the power button, it stayed absolutely dead, also LED indication in DC conector is not working. I am not clever from this situation but i got schematics and i also wanted to ask you, if u know about some issues of this laptop.

What i already done:
1) Tested power supply adapter - works fine, its oK

2)Measured voltage going from the power supply to mainboard-its ok

3)Change the LM339 on mainboard, still the same issue

I am including schematics in this post so please take somebody a look and tell me where the problem can be (FDMC4435, LM393...). Please help

[aanan]

Re: HP 4510s power problem

check 1st +V5AL on u1021 pin no5 schematic page no5 2nd check page no7 +V3A & +V5A.

[dj_ricoh]

Re: HP 4510s power problem

Even with bad bios the light from dc connector wont come on.
I suggest to start with that.
Reflash bios chip.

[ktmmotocross]

Re: HP 4510s power problem

as first even bios need 3.3V ALW power, so i will start from that

[smali]

Re: HP 4510s power problem

my suggestion is first check the voltage main voltage line on Q1031 source or R1262.
have you received adopter 19 v on that points?

[Th3_uN1Qu3]

Re: HP 4510s power problem

Even with bad bios the light from dc connector wont come on.
I suggest to start with that.
Reflash bios chip.

Yes, that is correct. But like others said above, check the 3.3v ALW rail first. You can check that on pin 8 of the BIOS chip.

[Dr.Spiegel]

Re: HP 4510s power problem

Oh wow! Thanks a lot! I hope tomorrow or in Sunday i will measure every value. Anyway i will report progress!

ktmmotocross: Zdravím na Slovensko.