zaurus81
Senior Member
Last Activity: 12-21-2025, 09:31 AM
Joined: 02-23-2021
Location: ragusa
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thank you... -
hi mcplslg123, SRP/SRN without battery is 2.94V. is this normal due to no battery? or is the bq chip not switching the 2 mosfets?...Leave a comment:
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good morning(evening) mon2, so from what you're telling me you're ruling out the presence of a damaged bq chip??
...Leave a comment:
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DCin mosfets tested:
first mosfet (PQ1003)
source / drain 2.6M OHM
source / gate OL
gate / drain OL
second mosfet (PQ1002)
source / drain 4.3 M OHM
source / gate 3,4 M OHM
gate / drain 6,3 M OHM...Leave a comment:
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hi mon2, sorry I expressed myself badly in a hurry, the values with the battery inserted were measured with the charging jack inserted, that's why I have 19.77 v
DCin mosfets are PQ1015 PQ1003 PQ1002?? see boardview - https://www.badcaps.net/forum/troubl...75ambad0-rev-d...Leave a comment:
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HP 15-cb028nl (dag75ambad0 rev. d) no charge battery
Hi all, I have a HP 15-cb028nl (dag75ambad0 rev. d) that turns on but does not charge the battery. The laptop arrived with the super I/O (ITE IT8987E BXA) burned. After replacing the EC, it turns on but does not charge the battery. Below are the voltages on the pins of the bq24738h, with and without the battery inserted:
...WITHOUT BATTERY WITH BATTERY PIN1 (ACN)= 19.76 V PIN1 (ACN)= 19.76 V -
hi, thx for reply. Can you explain me how you found it from the smd code?...Leave a comment:
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Hi, thx for reply. I have no short on 5v rail, just no 5v on usb connectors of all motherboard (8 port). If i put a jumper wire from pin 5 to pin 1, i have 5v on connector and usb port works. Each one of this chip controls voltage of 2 usb ports.
Where did you read that ocb is active low?
If it's a SY6288D, the enable signal is a ENB, which is active low from datasheet (see photo)...Leave a comment:
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Hp 290 g4 (all usb ports don't work)
Hi all. All the USB ports on this desktop computer are not working. Computer starts normally but it has only usb ports, no ps2 for mouse or keyboard. The motherboard is labeled KENT REV:A M11. I searched online for a schematic but couldn't find it. I checked the USB port EMI filters to see if any were broken, but they are all ok (they all beep). I have 5 volts on a 5 pin SMD component labeled REDFC (see photo) that is near each USB port, but 5 volts are not present on the USB port pin. I don't know where to start. Need schematic...
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Yashi All in one model AY62409 (Quantum S 24'') no image (backlight works)
This chinese all in one computer gives an image when connected to an external vga monitor but only the backlight with integrated monitor (no image). Initially I thought it was an edid problem on the eeprom of the screen but then I saw that the monitor works correctly with another identical motherboard (model th410-d4, read by bios). Unfortunately the motherboard is chinese and has no brand or codes on the pcb. The format seems ITX. Nothing can be found online. The official yashi site provides drivers but not the bios. The electrical diagram is obviously unobtainable
The board is equipped... -
free edition, you have a PM...Leave a comment:
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Hi Paul, i dont know if it's my pc's fault, but with this new version of flexbv (free edition) when i zoom in program crashes. I'm under win 11 pro....Leave a comment:
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Wow thank youLeave a comment:
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I thought it was right and proper to inform the people who dedicated part of their time to help me (@mon2) that the problem was the power supply, which had to be original. Once the power supply was recovered, the laptop started normally. Thanks to everyone for the help and especially thanks to mon2Leave a comment:
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I've always thought about this thing. thx piernov...Leave a comment:
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hi, thx for reply. DC jack has two additional pins (DE_JACK_DETECT and A/D_MAX_POWER_R_10)....
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i don't understand the question. see photo...
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maybe an "avada kedavra"🤣
same story.....4.3 present
is it normal to have prochot# at 0v on bq? something releted to absence of original charger??...Leave a comment:
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the voltage is absent on each inductor except the one that charges the battery. I write the voltages in a photo. I don't see any p-channel mosfets, they are all n-channel. See boardview
these 2.4 volts, with time (a few minutes), drop to 0.8v
all these values are strange since the n-channel gates are at 0V (board without sense resistor and bq24800)...Leave a comment:
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