HP Probook 4515s fail to start

[rtstorm]

Hi, deoes anybody work with this notebook? I have 2 of them and both turn on, no picture and caps lock blink 5 times. Try on external monitor - nothing. Is this the GPU fail. i read someware that 5 time blink is general board fail and 4 times blink is GPU.

[Turtlewax]

Re: HP Probook 4515s fail to start

A classic fix for many of these is simple:
Remove main battery & disconnect power charger.
Press on switch to discharge any residual power.
Reconnect batter & charger then try to turn it on.
I believe the problem has something to do with NVRAM getting goofed up every once in a while. Very common on DELL & Toshiba laptops...

[rtstorm]

Re: HP Probook 4515s fail to start

Try to discharge, did not work

[khaahk]

Re: HP Probook 4515s fail to start

Most likely northbridge failure. Needs to be replaced, reflow only temporary fix.

[robrock1]

Re: HP Probook 4515s fail to start

I had this once the power for gpu was missing i did a trick, i removed the power ic for the gpu, then i connected the gpu power to cpu vcore and disabled all other cores, so it runs only with one core, it worked for me since then the customer has not complained and its more then 3 month ago - so check if gpu voltage is present

[dj_ricoh]

Re: HP Probook 4515s fail to start

I had this once the power for gpu was missing i did a trick, i removed the power ic for the gpu, then i connected the gpu power to cpu vcore and disabled all other cores, so it runs only with one core, it worked for me since then the customer has not complained and its more then 3 month ago - so check if gpu voltage is present

:O
woow nerd
what was the V req to both cores?