Actually I've found the audio codec (Realtek ALC887) extremely hot and not working.
I'll look for a donor board to replace all the TVS & codec chip and report back....
DrFalken
Senior Member
Last Activity: 06-07-2025, 03:58 AM
Joined: 05-28-2008
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TVS removed and....all USB are back to work !
Actually I've found the audio codec (Realtek ALC887) extremely hot and not working.
I'll look for a donor board to replace all the TVS & codec chip and report back.... -
The data lines do not appear to be shorted (I checked all the TVS).
I checked the internal USB 2.0 ports (USB1112 and USB1314) and they work while the internal USB 3.0 (USB3_12) does not work.
Out of curiosity I checked the Ethernet port and it does not work (the LEDs remain off)
From the Linux terminal I saw that the USB 2.0, 3.0 and Ethernet controllers are correctly enumerated.
Could it be a partially faulty PCH?
Should I remove the TVS anyway and see if anything changes?...Leave a comment:
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ASUS B85M-E: USB and PS/2 not working
Hi!
I have an ASUS B85M-E with non-working USB and PS/2 ports.
GND and 5V are present.
I have tried other PCI and PCIe USB cards, but it still doesn't work.
I have reset the CMOS, updated the BIOS, but the problem is still the same.
What else should I check?
Half dead chipset ? -
Thank you for the reply.
I suspected the SOC was shorted because it gets really hot in the 5 seconds the board is on and also the resistance to GND on those 2 inductors is way too low.
Out of curiosity, I tried flashing the BIOS with another BIOS and the board doesn't turn on at all: if the BIOS is run by the CPU, why this behavior if it is dead/faulty ?...Leave a comment:
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Dell Inspiron 5593 shutdown after 5 seconds
Hello everyone!
Motherboard model: FDI55 LA-J081P
Today a customer delivered this laptop completely dead, with the original power supply shorting when plugged into the connector.
I found and replaced a shorted MOSFET (PQZ3).
Now the laptop turns on (fan runs fine but no video signal) and after 5 seconds it turns off.
BIOS has already been updated (both 64MB and 128MB IC)
+3VALW and +5VALW are still present.
+VCCIN = 1.8V stable (measured on PLZ1 at power up)
Abnormal readings:
PLZ1 to GND = 0 Ohm
PLZ2 to GND = 0 Ohm
... -
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ASUS Crosshair V Formula-Z no POST
Hi!
I have an ASUS Crosshair V Formula-Z (part number C9M0BX123818) that powers on but does not POST (boardview attached)
The small debug display (2 x 7-segment LEDs) remains off.
RAM, CPU, VGA and PSU work fine on another motherboard.
I checked some voltages and it seems +1.1VNB is missing.
I also replaced PCE503 and PCE500 (100uF 16V) because they were defective.
What else can I check?
[COLOR=#8e44ad][B]Link to boardview[/B][/COLOR] --> [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooti... -
Honor MagicBook X 16 mod. BRN-F56 dead
Good morning!
A customer just brought in an Honor MagicBook X 16 mod. BRN-F56, motherboard P/N Fermi_MB NB6269A_MB_V4, not working (no power LED, no charging LED, nothing)
He said he had been using an aftermarket power supply for a while, but noticed that it suddenly stopped charging and when the battery was completely dead the laptop would not turn on, even with the original (working) power supply.
On the power connector, on the motherboard side, I measure 20V.
With the thermal imaging camera I found a component labeled 2920J (TSOP5) that, when I supply power, increases...Last edited by DrFalken; 01-29-2025, 05:00 AM. -
Same board, same readings, same problems: did you solve it?...Leave a comment:
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Thanks for the suggestions !
The first one looks like good but I've never placed an order on Taobao
The 2nd one has reversed contacts so won't apply.
The 3rd one looks good but the side arms are higher, I should do some modifications to solder them
Meanwhile I've sent an email to Singatron (jennifer2) and I'm waiting for a reply......Leave a comment:
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Actually the closer I've found is this one from Würth Elektronik: [url]https://www.we-online.com/catalog/en/article/692121130100[/url]
Assembly will definitely require some modification...
I checked with Molex but haven't found anything similar yet
[ATTACH=JSON]{"data-align":"none","data-size":"full","data-attachmentid":3487414}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"full","data-attachmentid":3487415}[/ATTACH] [ATTACH=JSON]{"data-align":"none&q...Leave a comment:
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Dell Latitude 5530: damaged USB (type A) ports, cannot find replacements
Hello,
Yesterday a customer brought us a Latitude 5530 with 2 damaged USB ports (type A).
The ports are made by Singatron and, checking the measurements and soldering points, the model should be this one: [url]https://www.singatron.com.tw/en/product/file/280177-1[/url]
I checked at RS, TME, Farnell but I didn't find this model
Where can I find them? Something compatible is also fine...
Thanks!!https://Hello,<br /> Yesterday a cus...e measurements -
Sorry can't help 😥
If I remember correctly, the customer took the laptop back without repairing it...Leave a comment:
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Re: Lenovo V15-IIL dead
Fixed: replaced PQ101 with AON7410 and the laptop is booting normally.Leave a comment:
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Re: Lenovo V15-IIL dead
Just removed PQ101: source & drain are shorted.Leave a comment:
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Lenovo V15-IIL dead
Hello guys,
Lenovo V15-IIL M/B GS44D/GS54D NM-C71 Rev 1.0
Customer say that this laptop died righe after connecting an cheap aftermarket PSU.
Some readings:
- VIN = 20V
- PQ100 pin1-3 = 0
- PQ100 pin4 = 0
- PQ100 pin5 = 20V
- V9B+ [PR100 pin4] = 0
- +3VALW [RI4509 pin2] = 0
- +5VALW [UI4302 pin5] = 0
- +3VALW_PCH [DC701 pin2] = 0
- +1.8VALW [RX4601 pin1] = 0
- +VCCIN_AUX [PL9801 pin2] = 0
- ACDRV [PR105 pin2] = 0
- REGN [PC118 pin1] = 6,65V -
Lenovo V130-15IKB: no display
Hello everybody !
I'm working on a Lenovo V130-15IKB M/B LV315KB MB 17807-3M 448.0DC04.003M.
When the client brought it, laptop was almost dead: turn on but no image, no backlight, just a solid CAPS LOCK and POWER led.
Dumped original BIOS.
Flashed some BIOSes found here, also with ME cleared, and now it's booting: still no image on laptop's screen but it's working on HDMI.
Actually I've found some issues also on HDMI: sometimes I get no signal but it's booting because can connect to the desktop with a remote control software.
Readings... -
Re: MacBook A1342 820-2567: green light but won't turn on
Sorry for the late reply
L9710 = 0
L7620 >1,0
L7400 >1,0
L7401 >1,0
L7320 >1,5
[B]L7000 = 12,64[/B]
L7260 >5,0
[B]L7220 = 3,328[/B]
[B]bold[/B] readings are always present, the others last less that .5 second.Re: MacBook A1342 820-2567: green light but won't turn on
Sorry for the late reply
L9710 = 0
L7620 >1,0
L7400 >1,0
L7401 >1,0...Leave a comment:
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Re: MacBook A1342 820-2567: green light but won't turn on
I've just noticed that the board P/N is 820-2567-A (not just 820-2567) so I've tried flashing bios from [url]https://www.badcaps.net/forum/showpost.php?p=1211409&postcount=10[/url] and now the laptop doesn't turn on again (fan spin for just half second)
Re: MacBook A1342 820-2567: green li...t=10[/url] and
Leave a comment:
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Re: MacBook A1342 820-2567: green light but won't turn on
Just a reading fix:
- Pin 12 (3V3S5_DRVL) = [B]0.15V[/B]
Now I'll check the BIOS...
Update:
I've flashed the BIOS chip (rom file found on Alisaler, same A1342 820-2567 board) & verified the flash.
Now the laptop turn on, fan at full speed but black screen.
I'm trying SMC & PRAM reset...but doesn't seem to make difference.Re: MacBook A1342 820-2567: green light but won't turn on
Just a reading fix:
- Pin 12 (3V3S5_DRVL) = [B]0.15V[/B]
Last edited by DrFalken; 08-30-2023, 05:31 AM.Leave a comment:
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