You are using a bench power supply and not the official power adapter. This can be the problem since you are not pacifying the adapter detect circuit. Even at the start, the current draw is very low and typical of lighting up a few LEDs.
Would you have a suitable HP branded power adapter?
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Excellent research and updates by everyone on this thread!! Will be helpful to future readers.
Could you please attempt to attach the dump again? Do not see it in your last post. Perhaps zip or winrar the memory file.
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Try loading the following open source software and see if it is able to determine the CPU fan speed. Is it able to control the speed?
[URL="https://getfancontrol.com/"]Home - Fan Control (getfancontrol.com)[/URL]Try loading the following open source software and see if it is able to determine the CPU fan speed. Is it able to control the speed?
[URL="https://getfancontrol.com/"]Home - Fan Control (getfancontrol.com)[/URL]Try loading the following open source software and see if it is able to determine the CPU fan speed. Is it able to control the speed?
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Then you are ok here and the main power rail is not shorted. Next, need to review the charger ic to confirm it is being powered.
Are your meter probes fine tipped enough to measure the contacts of the charger ic? Remove all power and then check if the probes are fine enough.
If yes, carefully (!!!) measure each pin’s voltage to ground on the charger ic and share the list.
While not every pin is of interest, need to know the voltage of the pin that drives these 2 mosfets (ACDRV). The ACOK pin. ACDET pin. Not at my desk but these are common labels on every...
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Locate each and every SMBUS on the board. With no power to the board, meter in diode mode. Measure each such SCL / SDA line in DIODE mode. Searching for a shunted pair of communication lines in this initial review. Some sensor is failing and causing the fan to enter turbo mode. You should be able to run a diagnostic which will offer details on which sensor is failing. This failure can be a smbus / i2c communication fault; truly a bad sensor reading. On the battery area, there is a level translator to shift the 3v3 to a lower pair of voltages (1v8?) - confirm that side of the level shifter is ok....
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The drain pins will be pins 5-6-7-8. Any of these pins can be used to mate with the drain cluster of pins. So one meter pin on say pin # 8 on this mosfet; other meter pin to ground.
What is the resistance measurement?
In auto mode, the meter may take a bit of time to sample the measurement but will eventually settle on a value. If you have readings in the k ohms or M ohms, both are ok and you do not have a short on the main power rail.
On the alcohol - the stuff from Costco pharmacy works really well. We purchase their 4 pack (I believe it is) for well under...
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We need to sort out the terminology.
A resistance measurement will be reading stated with units of ohms; kilohm; megaohm, etc.
In diode mode, you are checking a voltage drop across the 2 terminals.
Be sure that in DIODE mode, the red probe is to ground and the black probe is on the point to test. If yes, this implies that you have a trace break between the 2 points being measured.
Confirm it by shorting your meter probe while still in DIODE mode. You will hear a tone beep. Next, one meter probe @ TP5100 for this signal and other...
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As per post #60. Should be [B]~12v6[/B].
Flux and remove F7040 off the logic board. Do not lose it. Power up without F7040 so there is no consumer side loading on this power rail.
What is the voltage to ground on the ISL (producer) side of this[B] PPBUS_G3H[/B] power rail?
reference:
[URL="https://boards.rossmanngroup.com/threads/solved-820-2936-ppbus_g3h-16v.14675/"][SOLVED]820-2936 ppbus_g3h 16v | Rossmanngroup Forums[/URL]As per post #60. Should be [B]~12v6[/B].
Flux and remove F7040 off the logic board. Do not lose it. Power...
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Saeco SG200E Coffee Machine
Hello. Have a known good Saeco SG200E Coffee machine but the internal hose from the pump were disconnected. Would someone be kind enough to share a few clear pics of the inside of this machine so we can reconnect the hose plumbing again? Many thanks....
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[B]RT8207P[COLOR=#e74c3c]GQW [/COLOR][/B][COLOR=#e74c3c] [/COLOR]; order this part number and with this suffix to be safe[B]RT8207P[COLOR=#e74c3c]GQW [/COLOR][/B][COLOR=#e74c3c] [/COLOR]; order this part number and with this suffix to be safe[B]RT8207P[COLOR=#e74c3c]GQW [/COLOR][/B][COLOR=#e74c3c] [/COLOR]; order this part number and with this suffix to be safe[B]RT8207P[COLOR=#e74c3c]GQW [/COLOR][/B][COLOR=#e74c3c] [/COLOR]; order this part number and with this suffix to be safe
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[URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/80630-ic-marking-codes-and-datasheets#post1482819"]IC Marking Codes and Datasheets - Badcaps[/URL][URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/80630-ic-marking-codes-and-datasheets#post1482819"]IC Marking Codes and Datasheets - Badcaps[/URL]
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PQ8902 is the mosfet that does [B]not [/B]have the 19 volts. The first mosfet that is mated with the DCin adapter has its drain pin connected directly to the raw power pin.PQ8902 is the mosfet that does [B]not [/B]have the 19 volts. The first mosfet that is mated with the DCin adapter has its drain pin connected directly to the raw power pin.PQ8902 is the mosfet that does [B]not [/B]have the 19 volts. The first mosfet that is mated with the DCin adapter has its drain pin connected directly to the raw power pin.
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Review the charger IC @ U7.
Carefully measure and share the readings of voltage to ground for:
[B]ACDET ; pin 6
REGN ; pin 16
VCC ; pin 20
ACOK ; pin 5
ACDRV ; pin 4[/B]
[URL=filedata/fetch?id=3259732&d=1714051300][ATTACH=JSON]{"alt":"Click image for larger version Name:\tU7.png Views:\t0 Size:\t99.2 KB ID:\t3259732","data-align":"none","data-attachmentid":"3259732","data-size":"medium"}[/ATTACH][/URL]Review the charger IC @ U7....
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Post each diode mode measurement.
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3259717}[/ATTACH]
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3259718}[/ATTACH]Post each diode mode measurement.
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3259717}[/ATTACH]
[ATTACH=JSON]{"data-align":"none","data-...Last edited by mon2; 04-25-2024, 07:10 AM.
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Which is the trackpad connector? Is it J3103 in the shared pic?
Test it by placing the meter in diode mode. No power on the logic board. Connect the trackpad.
Red meter probe (yes red) to ground.
Black meter probe to point to test.
Test each pin on the trackpad connector. Post each diode mode measurement.
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Another method to test the lines is to remove all power. No battery as well.
Meter in diode mode. Short the meter probes and you should hear a tone beep.
Red meter probe to ground. Black meter probe to point to test.
Measure at the contacts again or at the esd diodes that should be nearby. You can highlight the entire line of parts camped on the same pin using the boardview file.
Post the diode mode measurement which may be more convenient and less risky than a live power on test method.
Do inspect your trackpad connector and cables...
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This last batch of issues is common to many models. The sensors cannot be read so the fan spins in turbo mode. The sensors and battery are communicated over the i2c / SMBUS interface.
Carefully measure the voltage to ground of each pin on the battery connector. Checking to see if the sda / scl lines are being shunted to ground.
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