Da0lx8mb6d1 REV.D LX89 CAPS BLINK

[Umadbro]

Hi. I have the following machine:

HP Pavilion dv6-3156sg
DA0LX8MB6D1 REV: D
AMD CPU

Turns on, black screen, CAPS flashing white every 4 seconds, wifi is solid amber.
There was a little corrosion between two pads on the keyboard FPC, which I cleaned. No short. Tested bios flash but no luck. Tried slight reflow to GPU as reported to be a common issue on this model, no luck either.

I am unsure if the dumps I used are propper for this mb, as there are many different versions I can find on the internet, and the recommended on this forum didn't work.

Once again I tested all major coils/caps and no apparent shorts, the liquid damage between the kb points doesn't seem to have damaged adjacent capacitors. I will try to find the right schematic for this board. Could it be CPU? The hottest component in the motherboard once it's on for over a minute is the SOUTH BRIDGE ic (SB820), but not hot enough to point for short. Still, it burns while cpu/gpu haven't yet gotten ant heat on.

will appreciate any help

[piernov]

Re: Da0lx8mb6d1 REV.D LX89 CAPS BLINK

Usually dead RS880M northbridge. Should get hot pretty quickly without heatsink at least (don't leave it running like that for more than a few seconds).
CPU must be S1g4.

https://www.badcaps.net/forum/showpo...02&postcount=2

2.1. Never reflow large BGA
It won't fix the problem since 99% of the time it's not an contact issue between the BGA and the logic board. There's a high risk of damaging the board even further.
If you want to confirm if an AMD/NVidia chip is bad, you can heat it up to 200°C max for a minute and a half, no flux. It'll come back to life for a short while and then die again, because it's bad. In this case it has to be replaced.

[Umadbro]

Re: Da0lx8mb6d1 REV.D LX89 CAPS BLINK

Usually dead RS880M northbridge. Should get hot pretty quickly without heatsink at least (don't leave it running like that for more than a few seconds).
CPU must be S1g4.

https://www.badcaps.net/forum/showpo...02&postcount=2

Thank you for your help. I did use low temp, and only as a diagnostic test. The Northbridge didn't get hot, only South, I read later that NB is the usual culprit in this motherboard, on a rus forum. Unfortunately, I am unable to proceed with this repair as the customer preferred to invest in a more recent machine.

I very much appreciate your concern and will I look out for this fault next time I get a similar machine.