Hp 15-dy2087nr white lights blinking

[crewdog]

Board DAOP5HMB8F REV F
Model OPSH
No bios battery on board

Power at cord 19.7, swapped cord 19.7V just to test, tested lid switch good

Plugged in, battery in, charging port light on solid white, press power button, no fan spin, charging connector
and power on light both blink white, not in sync, battery voltage 12.2 jumps to 13.0 for a second and then back and repeats.

Not plugged in, battery in, press power button, no fan spin, power on only blinks white until battery removed, battery 12.7 - 12.1 for a second and then back and repeats.

Plugged in, battery out, charging port light solid white, fan spins momentarily, press power button, charging connector and power on light both blink white, not in sync.

Removed RAM, Memory, wifi card, touch pad, keyboard, daughter power on button assy. no effect.

No board shorts discovered, no burned components found on visual inspection.

19V rail present 3.3V rail present, I recall a 1V as well, 3.3V present at power button falls to zero when pressed and recovers when button released, pin on SIO chip receives the ground (wake up) command as it should, nothing happens.

No hot spots with thermal camera, cold board all over.

I am thinking a bad SIO chip (ITE IT5570e-128 CXA) but I don't know where to test past that and don't have a chip programmer.

Thanks Much.

[mel82]

Re: Hp 15-dy2087nr white lights blinking

Board DAOP5HMB8F REV F
Model OPSH
No bios battery on board

Power at cord 19.7, swapped cord 19.7V just to test, tested lid switch good

Plugged in, battery in, charging port light on solid white, press power button, no fan spin, charging connector
and power on light both blink white, not in sync, battery voltage 12.2 jumps to 13.0 for a second and then back and repeats.

Not plugged in, battery in, press power button, no fan spin, power on only blinks white until battery removed, battery 12.7 - 12.1 for a second and then back and repeats.

Plugged in, battery out, charging port light solid white, fan spins momentarily, press power button, charging connector and power on light both blink white, not in sync.

Removed RAM, Memory, wifi card, touch pad, keyboard, daughter power on button assy. no effect.

No board shorts discovered, no burned components found on visual inspection.

19V rail present 3.3V rail present, I recall a 1V as well, 3.3V present at power button falls to zero when pressed and recovers when button released, pin on SIO chip receives the ground (wake up) command as it should, nothing happens.

No hot spots with thermal camera, cold board all over.

I am thinking a bad SIO chip (ITE IT5570e-128 CXA) but I don't know where to test past that and don't have a chip programmer.

Thanks Much.

similar problem with my laptop... i have a post. question what is an SIO chip? so i can check mines

[crewdog]

Re: Hp 15-dy2087nr white lights blinking

Hi, the SIO or Super on/off as it commonly referred is a multi function chip that manages many of the board systems, its first feature is that when you push the power button it short circuits to ground the constant 3.3V line to it which "wakes" up the chip (see pic, the biggest chip) and its programming kicks in and sends current to the other necessary system controllers and essentially powers up the board.

The most notable feature is the fan spinning which tells the repairman that at least part of the chip is working and generally speaking if part is then its likely that all of it is. I posted a snip of the diagram pinout for the wake up section.

the one I am working on is programable, I am willing to buy one but id like to be more confidant in my diagnosis before I do and if its not Pre programmed then I am out of luck.

being there's no heat being generated suggests there is no short but an open which is harder to diagnose.

I could be off on the pinout but its the best I could find on the web.
https://www.manualslib.com/manual/19...b.html?page=86

Good Luck!

[crewdog]

Re: Hp 15-dy2087nr white lights blinking

simple test is find 3.3V on your power button and ground it for a second and if the fan begins to spin you have a bad power button.

[mel82]

Re: Hp 15-dy2087nr white lights blinking

Hi, the SIO or Super on/off as it commonly referred is a multi function chip that manages many of the board systems, its first feature is that when you push the power button it short circuits to ground the constant 3.3V line to it which "wakes" up the chip (see pic, the biggest chip) and its programming kicks in and sends current to the other necessary system controllers and essentially powers up the board.

The most notable feature is the fan spinning which tells the repairman that at least part of the chip is working and generally speaking if part is then its likely that all of it is. I posted a snip of the diagram pinout for the wake up section.

the one I am working on is programable, I am willing to buy one but id like to be more confidant in my diagnosis before I do and if its not Pre programmed then I am out of luck.

being there's no heat being generated suggests there is no short but an open which is harder to diagnose.

I could be off on the pinout but its the best I could find on the web.
https://www.manualslib.com/manual/19...b.html?page=86

Good Luck!

well explained!
is start for me to check... I order new multimeter waiting for it to get here start testing
and on my mainboard has secondary power button soldered as back up i guess for repairman.

[mel82]

Re: Hp 15-dy2087nr white lights blinking

simple test is find 3.3V on your power button and ground it for a second and if the fan begins to spin you have a bad power button.

is this one mine?

[crewdog]

Re: Hp 15-dy2087nr white lights blinking

PWR-BT? looks like one. test and check the voltage should be 3.3V. never seen one with a secondary power button before.

[mel82]

Re: Hp 15-dy2087nr white lights blinking

PWR-BT? looks like one. test and check the voltage should be 3.3V. never seen one with a secondary power button before.

my laptop is a gaming system. me too! i have opened few laptop in the past
nver see that i attached a picture circle in red is the secondary power button.