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HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive

xxl245 12432 21
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Why does an HP ProBook 450 G5 flash orange, ignore the power button, and warm the CPU when powered from either the charger or a charged battery?

The fault most likely sits in the processor power rail: measure resistance to ground on that rail, then check all MOSFETs in the CPU converter on diode mode, both source-drain and source-gate, because a damaged MOSFET or a shorted ceramic capacitor can pull the branch down [#18517264][#18518803] If the resistance in the processor supply branch is much lower than on a working board, the advice was to start with that converter rather than assuming the coil itself is the problem [#18517264][#18518803] Another reply recommended checking the main supplies first: +3V/+5V, RAM 1.8 V, and the processor converter outputs on the capacitors near the chips [#18513280][#18515083] The original poster later reported that the MOSFETs were not punctured and that the board was replaced, ending the repair [#18534674]
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  • #1 18504534
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    Probook 450 G5
    board DA0X8CMB6E0 REV: E

    After connecting the power supply (tested on 2 original power supplies):
    -power LED flashes orange
    -does not respond to the power button
    -the processor heats up
    -voltage on pin id 19,18
    -after connecting to the board, the voltage on the ID pin is 1.3V
    -current consumption 0.66A

    After connecting a charged battery:
    -power LED flashes orange
    -does not respond to the power button
    -the processor heats up

    I am attaching photos with measurements
    Attachments:
    • HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive 20200301_183715.jpg (2.61 MB) You must be logged in to download this attachment.
    • HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive 20200301_183654.jpg (2.5 MB) You must be logged in to download this attachment.
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  • #3 18511242
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    RebellionArts wrote:
    Hello,

    I see that the enthusiasm is there, the meter is also working, but not current consumption 0.66V because the current is given in amperes :)
    The orange diode suggests that the battery is not charging (potential) (there are many theories).
    A mine of patterns
    Basics of operation
    If you really want to fix this, look here


    I corrected the error and went through the training twice. Unfortunately, I did not draw any conclusions.
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  • #4 18511383
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6307
    Rate: 6802
    One of the 6 topics about this album gives a link to SM Link

    This is a board with 8th gen CPU
    HP ProBook 450 G5 15.6" , i5-8250U , MB: DA0X8CMB6E0

    ps
    HP PROBOOK 440 G4 MB: DA0X81MB6E0
    * Quanta Reilly 13"/Rourke 14" platform
    kbc NPCE586HA 0MX
    Flash Bios GD25B128CSIG
    charger PU1 BQ24 780S RUYR
    3/5V on PU25 RT6575AGQW

    MS similar Link_ probook-450-g3-quanta-x63-da0x63mb6h1
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  • #5 18511881
    RebellionArts
    Level 23  
    Posts: 588
    Help: 55
    Rate: 149
    Maybe from the beginning.
    Does the laptop have a fault only in the charging/power supply segment?
    Is there an image on the matrix/monitor?
  • #6 18511933
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6307
    Rate: 6802
    You have a boardview attached to this board, measure it and think about it

    PU20 APW8715QBI +1.5V_GFX Volt/4A

    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
    Attachments:
    • DA0X81MB6E0-BRD.zip (93.77 KB) You must be logged in to download this attachment.
  • #7 18512947
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    RebellionArts wrote:
    Maybe from the beginning.
    Does the laptop have a fault only in the charging/power supply segment?
    Is there an image on the matrix/monitor?


    After connecting the power supply or battery, only the LED blinks orange. No response to power, no image, no fan response. The processor warms up slowly.
  • #8 18513280
    Anonymous
    Level 1  
  • #9 18513356
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    lisek wrote:
    You have a boardview attached to this board, measure it and think about it

    PU20 APW8715QBI +1.5V_GFX Volt/4A

    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive


    Lisek, this does not apply to this album.
    You attached DA0X81MB6E0 and here is DA0X8CMB6E0

    Added after 1 [minute]:

    RitterX wrote:
    You won't achieve anything by thinking. Take the meter in your hand and first measure the product of the Vbat and +V20B outputs as well as the +3V/+5V converter and the processor converter voltage. Next comes the RAM supply voltage.


    I don't have sms for this CD. Can you describe what I should measure based on the photos?
  • #10 18513483
    lisek
    Service technician RTV  
    Posts: 39712
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    It should be the same.
    The author of the topic will check the layout.
  • #11 18515083
    Anonymous
    Level 1  
  • #12 18515282
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    RitterX wrote:
    xxl245 wrote:
    I don't have sms for this CD. Can you describe what I should measure based on the photos?

    From what is marked in the photo you have 3.3V/5V and 1.8V for RAM. There is no graphics converter voltage in the photo, the left photo is lower right corner. The voltages as you provided mean little because they do not concern the measurement points. Specifically on the advantages of electrolytic capacitors.
    Near the processor, all converters should have voltages higher than 0V, but this is probably not the case. KBC chip, right photo, large chip with Nuvoton written on it, is it warm, cold, hot?


    "left photo, lower right corner" is probably battery charging and I have 12.6V there.
    I have the second disc to compare.
    The only difference in the resistance of the coils is the coil at the processor where I have 1Ω 1V (after removing the coil, the resistance is on the processor side) and on the working board it is 80Ω 1V
    KBC room temperature

    I will post the voltage measurements on the capacitors tomorrow morning.

    Added after 13 [minutes]:

    lisek wrote:
    It should be the same.
    The author of the topic will check the layout.

    Can you mark where the charger is in the photo?
    I will provide its designation.
  • #13 18515411
    lisek
    Service technician RTV  
    Posts: 39712
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    If you have RT6575 for 3/5V, the charger must be, as I wrote, BQ24780S
    - HP Probook 470 G5 (DA0X8CMB6E0 Rev E) cpu e.g. SR3LC (i7-8550U)/ i5-8350U SR3LA
    * plus GeForce 930MX 2GB
    * kbc NPCE586ha2mx

    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
    the one on the left is V_Core *code (08 xsd) i.e. ISL95808HRZ-T
    The one on the right... give a description

    ps
    It is still available in mb ISL95338 Link
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive

    rev.F without add. graphics
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
  • #14 18515516
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    lisek wrote:
    If you have RT6575 for 3/5V, the charger must be, as I wrote, BQ24780S
    - HP Probook 470 G5 (DA0X8CMB6E0 Rev E) cpu e.g. SR3LC (i7-8550U)/ i5-8350U SR3LA
    * plus GeForce 930MX 2GB
    * kbc NPCE586ha2mx

    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
    the one on the left is V_Core *code (08 xsd) i.e. ISL95808HRZ-T
    The one on the right... give a description

    ps
    It is still available in mb ISL95338 Link
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive

    rev.F without add. graphics
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive


    On the left, yellow arrow APW8715
    On the right, a green arrow, Intersil 9538h

    Added after 6 [hours] 55 [minutes]:

    xxl245 wrote:
    RitterX wrote:
    xxl245 wrote:
    I don't have sms for this CD. Can you describe what I should measure based on the photos?

    From what is marked in the photo you have 3.3V/5V and 1.8V for RAM. There is no graphics converter voltage in the photo, the left photo is lower right corner. The voltages as you provided mean little because they do not concern the measurement points. Specifically on the advantages of electrolytic capacitors.
    Near the processor, all converters should have voltages higher than 0V, but this is probably not the case. KBC chip, right photo, large chip with Nuvoton written on it, is it warm, cold, hot?


    "left photo, lower right corner" is probably battery charging and I have 12.6V there.
    I have the second disc to compare.
    The only difference in the resistance of the coils is the coil at the processor where I have 1Ω 1V (after removing the coil, the resistance is on the processor side) and on the working board it is 80Ω 1V
    KBC room temperature

    I will post the voltage measurements on the capacitors tomorrow morning.

    Added after 13 [minutes]:

    lisek wrote:
    It should be the same.
    The author of the topic will check the layout.

    Can you mark where the charger is in the photo?
    I will provide its designation.
    Attachments:
    • HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive 20200301_183715.jpg (2.62 MB) You must be logged in to download this attachment.
    • HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive 20200301_183654.jpg (2.53 MB) You must be logged in to download this attachment.
  • #15 18517218
    lisek
    Service technician RTV  
    Posts: 39712
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    Give descriptions of the remaining arrangements. integrated into QFN or WQFN objects

    In the photo I found:

    ISL95859A Multi-phase 1+2+1 Core Controller
    NCP81172 VRAM 3-phase per chip + one on memory
    APW8868B DDR3L Link
    RTD2166 DPort to VGA translator
    RT6575 WQFN-20L 3/5V
  • #16 18517264
    Anonymous
    Level 1  
  • #17 18517316
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    RitterX wrote:
    If you have a significantly lower resistance value in the processor power supply branch, first check all MOSFETs of this converter. You measure both source-drain and source-gate on the diode range. You won't be able to go any further without the Hot Air station because at some stage you will have to desolder, for example, a suspicious transistor. You may have a short circuit, e.g. caused by a ceramic capacitor.

    However, after removing the coil, the resistance goes straight to the processor, so there is no point in checking the mosfets.
    I have hot air in stock.
  • #18 18518803
    Anonymous
    Level 1  
  • #19 18534674
    xxl245
    Level 16  
    Posts: 397
    Help: 17
    Rate: 39
    RitterX wrote:
    If you have low resistance to ground in the branch, the first thing you check, or disassemble for testing, are the MOSFETs. Even if the line is almost 0R, a damaged MOSFET may have a transition not only on the SD connector but also on the SG connector.
    You don't measure the coil resistance in series, but with respect to ground. This is a good orientation point because, unlike capacitors, it is usually one per phase and has large leads that are easy to grasp with a probe.


    I checked the mosfets and they were not punctured.
    Finally, I replaced the disc, so the topic can be closed
  • #20 19322337
    VVoSeba
    Level 8  
    Posts: 25
    Rate: 1
    Now I also have such a laptop with the DA0X8CMB6E0 REV.E board
    The first symptom was the caps and num lock flashing 7 times, no reaction to power, even the fan did not spin. It was not very convenient because the codes on the HP website and everywhere are described for up to 6 flashes. After cleaning the ME, the symptom is the same as described here, i.e. the orange LED is flashing (tried on several power supplies) and there is no reaction to power. At the moment, after such a general inspection and measurements, including analyzing what was written here, it is not clear what to catch here.
  • #21 19322544
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6307
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    There is a video of 7x flashing, but HP does not describe where and what is damaged
    Link
    HP Probook 450 G5 Charging LED Issue: Orange Flash, Processor Overheat, Power Button Non-Responsive
    *from the HP forum Link
  • #22 21733717
    igchazuka
    Level 1  
    Posts: 1
    I need a boardview and schematic for hp probook 450 G5 DAOX8CMB6E0 REX:E
    !Not 470 G5 DAOX81MB6E0 🙏

    Meanwhile I have a flashing/blinking white light 8 times.
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Topic summary

✨ The discussion revolves around an HP ProBook 450 G5 (board DA0X8CMB6E0 REV: E) experiencing a charging LED issue characterized by an orange flash, non-responsive power button, and processor overheating. Users report testing with multiple original power supplies and a charged battery, but the device remains unresponsive with the power LED flashing orange. Various troubleshooting steps are suggested, including measuring voltages at specific pins, checking the functionality of MOSFETs, and analyzing the board layout. The conversation highlights the importance of measuring voltages related to the power supply and processor, as well as the potential need for component replacement or further diagnostics. One user ultimately resolved their issue by replacing the disk, while another user reported similar symptoms with no clear solution.
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FAQ

TL;DR: For HP ProBook 450 G5 “orange LED, no power” faults, verify +3.3 V/+5 V rails first; "Take the meter in your hand." [Elektroda, Anonymous, post #18513280]

Why it matters: This FAQ helps bench technicians and advanced hobbyists quickly isolate power and charging faults on DA0X8CMB6E0.

Quick Facts

What does a blinking orange charging LED mean on HP ProBook 450 G5?

It indicates a charging fault or a battery that is not charging. Confirm with a known‑good HP adapter and a charged battery. The LED alone doesn’t isolate the cause, so move on to rail measurements and charger IC checks. “The orange diode suggests that the battery is not charging.” [Elektroda, RebellionArts, post #18504624]

HP ProBook 450 G5 won’t power on, CPU warms, orange LED blinks—what should I check first?

Check adapter input (VBAT/+V20B), then verify +3.3 V and +5 V rails are present. Next, measure CPU VRM output (Vcore) and RAM supply voltage. Proceed systematically across converters before suspecting firmware. This order catches most board‑level power faults quickly. [Elektroda, Anonymous, post #18513280]

What current draw and adapter ID‑pin voltage did others see with this fault?

A reported unit drew about 0.66 A from the adapter with the LED blinking. The adapter ID pin read roughly 1.3 V after connecting to the board. Use these values as comparative clues, not absolutes, and cross‑check against a known‑good board. [Elektroda, xxl245, post #18504534]

Which charger and 3/5V controller does DA0X8CMB6E0 use?

The board uses a BQ24780S charger and an RT6575 controller for the +3.3 V/+5 V rails. The CPU Vcore VRM is driven by an ISL95808 controller on this platform. Probe their outputs to confirm enable and regulation during start. [Elektroda, lisek, post #18515411]

How do I spot a short on the CPU core rail (Vcore)?

Measure resistance from the Vcore inductor to ground with power off. Around ~1 Ω indicates a short compared to ~80 Ω on a known‑good board. Isolate the rail by lifting the inductor, then compare CPU‑side resistance to confirm location. [Elektroda, xxl245, post #18515282]

How should I test the CPU VRM MOSFETs on this board?

Use diode mode to check source‑to‑drain and source‑to‑gate drops for each phase MOSFET. Desolder suspicious parts with hot air for off‑board testing. Replace any that leak or short. “You may have a short circuit, e.g. caused by a ceramic capacitor.” [Elektroda, Anonymous, post #18517264]

Where do I probe the +3.3 V/+5 V and +1.8 V RAM rails?

Probe at the positive terminals of nearby electrolytic capacitors for clean access. Expect +3.3 V and +5 V on the main rails, and +1.8 V on the RAM rail. Also observe the KBC (Nuvoton NPCE586) temperature during attempts. [Elektroda, Anonymous, post #18515083]

What is PU20 APW8715 (+1.5V_GFX) and should it be present at idle?

+1.5V_GFX is generated by PU20 APW8715 and supplies the graphics domain. It is a 1.5 V, ~4 A rail. Verify its enable and output near PU20 with the boardview. Presence depends on power state and platform configuration. [Elektroda, lisek, post #18511933]

Will cleaning Intel ME fix a 7‑blink or orange‑LED no‑boot on this board?

One case showed 7 blinks that persisted after ME cleaning. Afterward, the unit reverted to the orange‑LED, no‑power condition. This suggests power‑rail or hardware faults, not just firmware, so complete electrical checks are essential. [Elektroda, VVoSeba, post #19322337]

What does 7x Caps/Num Lock blink indicate on this platform?

7x blink has been observed on similar ProBooks, though HP’s standard tables often describe only up to 6. Treat it as a severe power or firmware signal and validate rails and VRM behavior before deeper firmware work. [Elektroda, lisek, post #19322544]

What other controllers should I know about on DA0X8CMB6E0?

Expect ISL95859A as a multi‑phase core controller on some revisions, NCP81172 for VRAM, APW8868B for DDR3L, RTD2166 for DP‑to‑VGA, and RT6575 for +3/5 V. Identifying each helps target probing points fast. [Elektroda, lisek, post #18517218]

How can I compare against a known‑good board to speed diagnosis?

Measure inductor‑to‑ground resistances and key rail voltages on both boards side by side. Large deviations point directly to the failing domain. Example: ~1 Ω vs ~80 Ω on the CPU inductor indicated a Vcore‑side defect. [Elektroda, xxl245, post #18515282]

Quick 3‑step triage for “orange LED, no power” on HP ProBook 450 G5?

  1. Verify VBAT/+V20B at the DC‑in path and charger output.
  2. Confirm +3.3 V/+5 V rails are present and stable.
  3. Check Vcore enable and voltage, then the RAM rail. Work methodically to isolate the failing stage. [Elektroda, Anonymous, post #18513280]

Is motherboard replacement a reasonable outcome for this fault?

Yes. After verifying MOSFETs and rails without a clear, repairable defect, replacing the board resolved the case discussed. This is practical when CPU‑side faults or multilayer shorts are suspected. [Elektroda, xxl245, post #18534674]
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