Hi,
I've a Dell P75F010, with a FDI40 LA-G716P motherboard that don't power on at all.
I connected the MB to a bench power supply, 19v 1Amp and when I press the power button, nothing happen, no current drawn (some little fluctuation like 0.0005 to totally 0). So seem that I don't have any obvious short..
I just checked the first two mosfet that are immediately after the power connector and the first one was blown (is an AON6994, the first one will have a little hole on surface..) I replace it and now both mosfet has 19v on source.
I did some...
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Dell P75F010 not power on, no short
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Re: Schematic for qnap TS-453B
Hi, I've a TS-x53be with exact same problem… do you find any solution?...
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Re: ASUS X751LD internal monitor black screen
as first, thank you very much for you support and sorry for the late reply.
I try do my best to solve the problem on my own... following your suggestion, I checked every single pin and after a lot of troubleshooting I discovered that there are some stranges value on pin 10.
As first sight I don't see an oxidation on a trace, so i cleaned up the trace, cleaned the pad (that was almost destroyed!) and soldered a wire to rebuild the track and all start work again!!
Thank you for your suggestion!!...
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ASUS X751LD internal monitor black screen
Hi,
I've a asus laptop with X751LD rev 2.0 MB.
The laptop screen remain black but if I attach an external monitor on HDMI port I see the bios screen.
I checked power lines on lvds and i found 18.78v also i don't find any obvious problem.. like shorted caps or mosfet on lvds connector area..
there is something that I can check to find the problem?
thank you
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Re: ACER E1-522 MS2372 USB not working
anyone has an idea about what I can check next?
thank you!
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Re: ACER E1-522 MS2372 USB not working
@mon2 any other suggestion based on my measurements?
thank you!
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Re: ACER E1-522 MS2372 USB not working
Hi,
first of all, thank you for you support, I just measured the two diode and i found that both are around 0.5V (diode mode)
Just to be sure that I checked the right components.. are the two diode in the attached picture? sorry if I ask but I don't have the boardview and with a visual inspection, I can't find any component with D3401 and D3402 i just use some intuition.. These are my first repairs attempts :P
(sorry for the picture quality... I do my best to take the picture :P)
for...
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ACER E1-522 MS2372 USB not working
Hi,
the computer work as expected except that all usb ports both on board and daughter board not work (usb3 on board, 2 usb2 on daughter board) all voltages seem ok, I take some measure from U3501 and U6301 and found as per below:
U3501 pin
1 = 0
2/3 = 5,096
4 = 0
5 = 0,720
6/7/8 5.096
U6301 same value excepted for 5 that is 0,450
Also, if i attach an usb device (even a simple keyboard) on USB3 (on board port) the boot process will hang with a blinking cursor on the upper left corner of the screen.
...
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Acer Extensa 2519 - n15w4 Battery problem
Hi,
I've an n15w4 with a very strange problem.
I received the laptop after a failed bios update, so I downloaded the bios from Acer website, then after extracted the bios from installation package (with correct size, I extracted it from bios.bin file)
I reprogrammed the eeprom (after make a backup anyway), now the laptop start (the bios have a fake serial number and fake device name.. something like 123456789012 and acer_xxxx but it's work)
Everything went ok, but now I still have a problem... seem that the battery won't charge (seem, but I...
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Mac Mini 1347 bios request
Hi, I need the bios for the model in subject but I don't know the exact model.
I'm not sure that the provided model information are enough to find the right bios, if there are more info needed, please tell me where i can find on the motherboard or on the mac body because the mac don't start at all.
Thank you for any support!
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Mac Mini 1347 EMC 2840 show nothing
Hi,
a friend of mine give me a Mac Mini 1347 that don't work anymore.
I don't know the exact model.. my friend told me that is a 7.1 late 2014 (as far he can remember) but i don't know how can I check if is really this model
The computer start, the fan start and run but connected to HDMI show nothing.. the CPU cooling block became a little bit hot so seem that the computer start..
I see that there is no way to find schematics for this models.. where I can start to analyze the problem?
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help for identify an smd diode
I need to identify the diode on attached image. is an SMD diode on damaged board.
As more wide question... there is a way to identify any smd component in a more or less simple way?
Every time that i need to identify some components with no schematics is a nightmare for me!
Thank you for any kind of support!...
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Re: Acer E5-575G-70FG No video
@mcplslg123 thank you very much!
Following you suggestion I found something... take a look at attached image, the coil numbered 1 don't have any power... everything around seem ok... no shorts and all voltages seem ok.
I suspect that the problem can be the Mosfet that I've marked as 2.
Seem that don't send power to the coil... the id over the component is
Z5049QI (there is a second line below the first one and is TA612D I don't know if this is relevant) can be this the culprit?
I just discovere another...Last edited by digitalblade; 01-26-2021, 11:38 AM.
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Acer E5-575G-70FG No video
Hi,
as per title, I've an Acer with no image on screen.
This is my first try to fix a laptop.
[LIST][*] the laptop show red led immediately after attaching power source (bettery charging circuit)[*] Power button seem ok, when pressed a blue light shown on left of the red one after 2 seconds (more or less)[*] Nothing visibly damaged (no evident blown components )[*] I checked some caps and around the power section, everything seem
fine... nothing seem short, power rails seem ok (19V Or 3.3v found on all tested components)[*] Fan start after around 20 seconds...
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Re: Samsung P2470HD Turns off
sorry but i can't understand what you mean with "is your set the same as the op?" sorry but English is not my primary language :P...
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Re: Samsung P2470HD Turns off
just to be sure.. as ccfl you mean the entire board with the TM-08190 or only the transformer? because the transformer itself cost only 10 bucks so i can buy one to test it..
thank you...
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Re: Samsung P2470HD Turns off
unfortunately not i'm not a "real" repairer.. only an hobbyist guy with electronic skill :P this is a friend of mine monitor that yesterday evening suddenly stop working..
There are other measures that i can do to find the problem?
In the mean time i see that on the back of power board there is a SEM-2005 that is an inverter driver IC (check here [URL="http://www.datasheet-pdf.info/entry/SEM2005"]here [/URL] for schematics).
There is something that i can measure here? i don't have...
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Re: Samsung P2470HD Turns off
I just measured the points and for both set I read 175.9K ohm
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Re: Samsung P2470HD Turns off
Hi, please find attached images as your request, i hope that this can be useful for helping me to diagnose the problem.
thank you very much!...
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