johnbeton
Senior Member
Last Activity: Today, 02:56 AM
Joined: 06-14-2021
Location: Hasselt
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I was afraid for that, so this one is unrepairable -
HP EPK50 LA-G07EP short on +3VALWP and +1.0V_PRIMP
Hello,
Working on a board HP EPK50 LA-G07EP. Owner tried to replace LCD display without disconnecting battery. Afterwards, the notebook turns on for a few seconds and shuts off.
Mainrail looks fine, battery charges. I have +5VALWP, but that's it.
I measure short to ground (0.03Ohms) on +3VALWP and +1.0V_PRIMP.
Injecting 1v at 3A on PL1001 and PL302 only slightly warms up the cpu after several minutes. -
Hello,
What is the background of the laptop ? How did it fail?
Best start is to check for short to ground on every coil of the mainboard.Leave a comment:
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thanks a lot !Leave a comment:
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long shot, but don't know if anyone has this boardview or schematic ? Or maybe some ideas how to diagnose this board.
Touching some areas make the leds go on, but when I touch ground with the other hand, the leds go off.
What could be a cause of this ?Leave a comment:
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it looks to be a 0603, I will order some of these and try, thanks a lot for your guidance and advise.Leave a comment:
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it is connected to ground, the one that mates with pin 32 is the smaller cap on the top left of the icLeave a comment:
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it is on pin 31, so i need 2200pF 25v i assume ?Leave a comment:
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HP 15-CS3131NB G7BD(2G) shorted cap
Hello,
I have this board in for repair, it came in not charging, not powering on. Found a short on a cap near the charger IC.
With the cap removed, the laptop charges and works, but seems to work very slow.
I have a second board with the exact same problem, and the exact same capacitor shorted. So I replaced the bad capacitor with the good second capacitor of the other board, and the laptop works fine now.
I'm trying to identify which type capacitor this is, so I can order new ones to fix the 2nd board too, and maybe some future incoming since this seems to be... -
Managed to solve this problem.
I manually selected the IC and chose for XM25QU64B (pure guess because it's closest to XM25QU64A instead of automatic detection XM25Q64.
I unchecked the Check ID option and selected lowest SPI frequency (4.0mhz). Don't know if higher frequency would work also, but with these settings write / verify success.
Resolderd the chip and system works :-)Leave a comment:
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I cannot find this information in XGPRO, you have any idea where I can find it ?Leave a comment:
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The top reading is XMC QU64AHIG.
I tried all speeds with no success (forgot to mention)Leave a comment:
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Flashing bios failes Acer A315-34 XM25Q64 with TL866-III
Hello,
I have a Acer A315-34 that came in with no post. FN-ESC shows Tianocore logo, and with bios .fd file starts reading from usb, but system doesn't post afterwards either.
I read the original bios with my TL866-III reader with XGPRO with success.
Erase works but writing a new file always gives an error.
Any one have an idea what I can try next ?
This is the log from XGPRO
APP Version : 12.63 Model : T48
Device : XM25Q64 @SOIC8
Pins Detected Passed!
ID: 0x 20 38 17 ......OK!
Erase ...Succeeded.... -
looking for schematic for Acer SP313-51N board Yacht_TL 203022-1
Hello,
I'm looking for the schematic for a Acer board Yacht_TL 203022-1
The board had some minor liquid damage.
I have no shorts, have 3v, 5v, 3.3v, ... but no leds or power on.
When touching certain parts of the board with my finger, the powerleds go on or start blinking. -
Hi, to come back to this laptop. I still had this laying around and because I couldn't sleep I picked this repair up, it's been a long time, but the owner bought a new on back when it broke, and didn't expect a repair. But I could not believe the 19v rail would directly warm up the CPU with voltage injection.
So what I did was remove the bridges PJP8101 and PJP8102 to isolate the 2 sides of the board.
The short was on P_IMVP9.1_VCCCORE_VIN_S
I injected 1V 3A on that side of the board, but again only CPU/PCH warmed up slightly after 15min.
So my guess was one of the...Leave a comment:
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it was pre-flashed by the seller. After replacement all voltages were fine and the device startsup and charges.Leave a comment:
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I decided to order a new IT8528G and give it a try, after couple of weeks waiting the chip arrived, and now the problem is solved.
So the initial problem was the IT8528G.Leave a comment:
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Hello,
In this link you can find the schematic and boardview:
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/99512-lcfc-s550-nm-c811[/url]
Look in the boardviewer for the net 'PLT_RST#' and you will easily find all components that are part of 'PLT_RST#'. You can then measure voltage and resistance to ground.
In my case I fixed the laptop with flashing the bios. This is 1.8v bios, and you have to desolder the chip from the board to...Leave a comment:
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If I follow the power sequence, first in line that has 0V is VCCDSW_EN
maybe it is a defective U3601 (IT8528G).
I found this topic on this forum with a comparable problem:
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/94230-surface-pro-4-doesn-t-turn-on[/url]
I'm just thinking out loud, the changes in voltages after 1 minute must be something controlling this... maybe this IChttps://If I follow the power sequen...is a defectiveLeave a comment:
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Yes, that is the one, but it measures fine when I take it off the boardLeave a comment:
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