HP 14 DA0U8AMB6A0 short in 1.05v anything hot

[ruletero]

I have this motherboard DA0U8AMB6A0.

It has PU14 (+1.0VS5) burned, I replaced it and now when I press the power button it turn on and turn off in half a second.

I checked and found it has a short in +1.05V line

PL23 has 1.7 ohms to ground and I inyected 1v and it use 3A or more but anything is hot, only a little the processor but very little.

The processor is dead?

Please help

[ruletero]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

(I replaced it and now when I press the power button it turn on and turn off in half a second.)

Sorry, I forgot to tell it, I have all voltages on that instant including VCCore

[Spider1211]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

Remove PJP6 (unsolder and make sure contact are properly clean) and measure resistance again on point 1 and 2. If resistance to ground on point 1 is low resistance, remove PU13 and measure again.

[ruletero]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

Sorry, the mother hasn't pads, they are only marked in the schematic.

I remove PL23 and it has 123 ohms on PU13 side and 1.6 ohms on PJP6 side, then, the short is PCH or processor, I guess.

[Spider1211]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

Inject 1V in PJP6 side and see what gets hot. If the PCH die gets hot, its most likely shorted.

Check if resistance of PR240 and PR241 read ok also.

[ruletero]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

Inject 1V in PJP6 side and see what gets hot. If the PCH die gets hot, its most likely shorted.

I already inyected 1v in PL23 PJP6 side , but nothing is hot, only the processor a litle.

Check if resistance of PR240 and PR241 read ok also.

Values are correct but I had to remove them to check.

[Spider1211]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

Can you increase the current? I see from post #1 you used 1V @3A. Can you try 1V @5A?

[ruletero]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

I haven't psu, have built a regulated power supply but it can't deliver more than 3A. I'm going to find another option to try with 5A but I guess 3A is a high current and I should to note something hot.

[Udemzy]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

Replace processor it is short.

[ruletero]

Re: HP 14 DA0U8AMB6A0 short in 1.05v anything hot

That is the first one I thought but I wanted to listen the experts opinion because the processor isn't so hot only a bit.

Unfortunately I don't have maner to change it so I'm going to find a new mobo.

Thank you for your response