ryogadan78
Senior Member
Last Activity: 04-22-2025, 04:58 AM
Joined: 11-20-2021
Location: Messina
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I don't want to bother you, just to know if you think I can go ahead with the repair or is it too complicated... -
Hi Mon2, do I start disconnecting ICs and cleaning the mainboard?...Leave a comment:
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Hi Mon2, sorry I have not been present. Health problems. Here I am with you. I am enclosing a photo where you can see the initials above the chip and a photo showing a larger area of the mainboard. I actually noticed too that the boardview file does not match 100%.
The region of this area is burnt
Topside marking of IC
51486
TI OA8
AEP5...Leave a comment:
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Hi Mon2, I don't know if you have seen the latest updates, I need your help. I really wouldn't know how to go on...Leave a comment:
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I injected 1V on the 5V pin of one of the capacitors on which I detected a short to ground. With the thermal camera, I identified an area of the mainboard that I had not inspected and found this nice surprise. Based on the boardview IC it is PU8700. Any suggestions?...
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Done, the short circuit still seems to be present. Resistance to ground is 0.4ohm...
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Hi Mon2, I don't know if you saw my answer. Unfortunately I don't really know how to proceed considering that the VBUS comes to this IC. Any suggestions?Leave a comment:
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In the boardview, the USBC connector is marked as CNP1. The TBTA_VBUS_L pin is connected to pin 10 of an IC marked on the boardview as UP1. I enclose a photo pointing out that two nearby capacitors are shorted to ground on both pins...
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OK the procedure should not be complicated also because I caused the short on the only USBC port. I have to leave the lab now but I will do the research as soon as possible and update you...Leave a comment:
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Hi Mon2, you are always so kind to reply.
I only have the boardview of this board and probably wouldn't have the experience to read a schematic. Could you help me? identify the components to be tested by the name they have in the boardview?...Leave a comment:
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Omen laptop DA0G3EMBCD0, shor circuit from USB
Good morning guys. I have my Omen laptop (DA0G3EMBCD0) that now gives no signs of life (no LED).
During the night I misplugged a slim usbdrive which had the shield damaged, I guess I caused a short because the laptop turned off and never turned on again.
After taking it apart I noticed with the thermal imaging camera that two ICs on the mainboard reach 100 degrees Celsius. Thanks to the boardview I saw that they are PU8600 and PU8601. I tested the pins of these ICs and found these anomalies compared to the schematic
PU8600
6 (3VS5_LX) - 5 OHM to ground (normal?)... -
Good morning guys. I have my Omen laptop (DA0G3EMBCD0) that now gives no signs of life (no LED).
During the night I misplugged a slim usbdrive which had the shield damaged, I guess I caused a short because the laptop turned off and never turned on again.
After taking it apart I noticed with the thermal imaging camera that two ICs on the mainboard reach 100 degrees Celsius. Thanks to the boardview I saw that they are PU8600 and PU8601. I tested the pins of these ICs and found these anomalies compared to the schematic
PU8600
6 (3VS5_LX) - 5 OHM to ground (normal?)...Leave a comment:
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Xbox Series X
Good morning guys,
I am resuming an old service on an Xbox X Series that I really want to repair. I summarise what has been done because I can't find my previous post.
The Xbox initially did not turn on, no LED, no beep. Found short circuit on the 12V connector on the bottom board. Injecting 1.5V on the positive side of one of the shorted capacitors to find with the thermal camera which capacitor was shorted, no gave me useful information. The board draws 2.80A (1.5V), but from the thermal camera images I don't see any component getting hot.
I removed the coils one by... -
Hi Pablo, have you find a solution? I have exactly the same problem...Leave a comment:
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Hi wtfrules,
thank you for your support. I also visually analysed the board under the microscope and found nothing abnormal. No overheating or oxide or overvoltage damage.
This mainboard also does not always have the problem, sometimes it works correctly....Leave a comment:
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I apologise. Sometimes my dyslexia comes back to visit me. I meant U1800Leave a comment:
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Hi mon2, yes I have an adjustable power supply. I set it to 1.5V, max ampere (5A).
I injected the current on pin 2 of L7710, sometimes the current drawn is 0.05A. Sometimes, switching the power supply off and on, the current drawn is 0.60A. In neither case I can detect any component overheating. I have tried both with the thermal camera and by touching the mainboard with my hand. The thermal camera shows me only slight heat (26 degrees against 23 for the rest of the board) in the area of the U8100
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OK, here I am.
When I measure the resistance to ground on L7710 by disconnecting all voltages, the value is 95ohm.
If I repeat the measurement by connecting the voltage, with initially the first LED on, then activating the power switch, after the LED goes off, the value drops to 15ohmLeave a comment:
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Hi mon2, I followed your advice and connected the power supply safely (see the picture). When I connected the power plug, the first of the four LEDs lit up. I measured at this time the PP12V_G3H on C8111 and it was stable at 12V. I then turned on the iMac through the switch pins and, as often happened, the first LED went out. I measured PP12V_G3H on C8111 again and 12V was still present. I checked the mainboard and nothing seems to be overheating at this stage
Thank you again for your very kind help
[ATTACH=JSON]{"alt":"Click image for larger version Name:\tWhatsApp...Leave a comment:
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Hi, I injected a small current on the two inductors. 1.8V and 2.3v ... absorption between 0.05 to 0.28 amps, I don't see any particularly hot components on the motherboard. I tried repeating the test by turning the bench power supply on and off many times, considering that the original problem is not always present, but nothing changed.
How do I find the problem of this motherboard occasionally working and often not working?Leave a comment:
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