Re: HP 15-DA0005TU (LA-G073P) not turn on , no display


No, I haven't programmed the kbc. Thanks for this inspiration.
One point I wish to clarify. In desktop, bios initialize video before kbc check. At which kbc error will be reported on screen. Does Laptop bios go in different way?...

Re: HP 15-DA0005TU (LA-G073P) not turn on , no display


Yes, it keeps on indefinitely without RAM. All mentioned voltage present....

Re: HP 15-DA0005TU (LA-G073P) not turn on , no display


all bios compared with same BID:084AA...

Re: HP 15-DA0005TU (LA-G073P) not turn on , no display



Thanks to Lapfix, but it does not work. With this bios(at post#20), there is no timeout after 30sec but still, no display, and epd_vdden remains low.

I have compared this bios with HP stock bios. It is very similar to version F35, except for the DMI region and 3C8420~3C8453. It may be some code at 3C8420~3C8453 that disabled the timeout function.

From a good point of view, bios issue can be ruled out ...

Preamble: Not water damage. Suddenly black screen during use, can't turn on afterward.
This is my first chip-level laptop repairing.
Detail diagnosis: AC LED on, battery charge normal. Power LED on but no display and no error LED blinks. Long press power button can turn off the power LED. When no RAM, power LED is keeping on and all know voltage is present(detail is as below). When RAM is installed, no display, all voltage measured but the power self turns off after 30 sec.

Voltage measured:
V19: 19.7V
3VALW: 3.36V
5VS: 5.02V
3VS: 3.36V...

Re: New Members - please post your introductions here

I am a retired FAE. Now working on a broken HP laptop.
The information in this forum is very useful. Thanks to the effort of every member