HP Envy 27 B210 AIO All-In-One Boot Problem

[cheebster]

Hello! I have a problem with 2 machines, exact same model same issue.

They are HP ENVY 27-b100 All-in-One Desktop, Model No.27 B210

On bootup, they give both led and speaker beeps together, 3 long and 4 shorter beeps.

The power supplies are original HP 200W, and i bought 2 replacement PSU's that give the same result

Ram has been tried with or without, same result, and also tried a CMOS reset

The main board is HP CONFIT L04815-601 L04815-001 tpc-t008-27 sch3730-6050a2960801-mb-01

From this page;

http://h10032.www1.hp.com/ctg/Manual/c06589940

3 Long, 4 Short
The system board displays a power failure (crowbar)

1 Reduce to minimum config (CPU, Main-Board, PSU,
Single memory DIMM) and isolate failed component.
2 Reduce further if issue persists.
3 Test known good PSU.
4 Replace affected component.
5 If unable to confirm source, replace CPU, Main-Board, PSU.

So it seems the board has some issue, and it seems that it happens often, both units i have do exactly the same.

Anyhow can help with this ? thanks

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Would it be possible that my issue is a bios related issue, corruption or similar ?

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Anyone ? Thanks

[lustre]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Typically for similar symptoms on Dell motherboards, there's an auxiliary power rail that's not present like DDR_Vtt on DIMMs. Reflashing BIOS would be the easiest start but typically those beep codes are pretty accurate

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

So you mean that's really a power rail failure on the board, a component that failed ? I don't know where to start..

[reformatt]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Yep, probably a missing power rail during the power up sequence. What I normally do is measure resistance to ground of each coil, hopefully finding a short. Note that low resistance on coils near the CPU is to be expected (like 2 ohms or more). What you are looking for is a dead short on 3.3/5/1.05/1.2V rail.

Unlikely to be a BIOS issue, you can try a CMOS reset by disconnecting the CR2032 battery and shorting the pins. Obviously do this with no power present.

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Ok thank you. But how do i identify/find where are the rails to check without schematics ?

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Hello. Anyone can give a tip on where to start on these? Thanks.

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

I looked around the board and couldnt find anything visually, or checking everything i could with the meter. Here are pictures of the board, maybe some could chime in.. Thanks

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Anyone ?

[SMDFlea]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

Anyone ?

Post the exact resistance measurements to ground of all the large grey square coils, on both sides of the board.Mark them on your pictures

[cheebster]

Re: HP Envy 27 B210 AIO All-In-One Boot Problem

With a fluke 115 set in ohm mode auto, i get all readings in MegaOhms and fluctuating either up or down. is that normal ? On each coil.

[cheebster]

Anyone can help on this one ? Stuck with these 2 with the same symptom and can't fix them. I've tried poking around with the meter, but i would really appreciate some guidance. Thanks

[kodinabeel]

Anyone can help on this one ? Stuck with these 2 with the same symptom and can't fix them. I've tried poking around with the meter, but i would really appreciate some guidance. Thanks

any option you have