Hello all,
I'm working on an Acer Nitro 5 (AN515-54) with motherboard EH5VF LA-501P with a short on the power rail.
I'm just learning board level diagnostic, but here is what I've found so far.
I injected 1.5v to one of the positive leads on the DC jack connector (PJP101) and read about 1.4a to ground.
I felt around for heat and found the MOSFET at PQB12 is rippin hot!
when i pulled the MOSFET from the board the short went away. In my mind it was a faulty MOSFET.
Ordered a replacement and got it installed only to find it gets very hot again and the short returns....
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-
05-23-2024, 06:07 PM
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Hello Guys! I have trouble with my car radio Kenwood KDC 3051G I hope someone more knowledgeable can help me, I tried everything in my power that I stumbled upon online.
My radio is permanently in demo mode, it says Press Volume Knot Cancel Demo and when I press it nothing happens.
- Tried to unplug radio and plug it back in into power,
- Tried to reset radio by holding reset button key for 5,10,30 seconds while in power and without power, plugging it back in, it wouldn't work.
- Tried to hold 3,6 while turning it back on and then pressing 1,2...05-23-2024, 01:27 PM -
Hello to all, I'm new here on this forum, so I have T-con board that makes me crazy, so when I start to diagnose the problem, on first MAX9591 was overheating so I tried with 1 flat cable from panel and half picture was working and IC was fine, so I take out T-Con I check every capacitor, diode, mosfet, everything was good, so I continue to right board from the panel, I check everything, and I didn't find any issues, so I connected again, I started the Tv with both flats, and TV worked, I tried every settings in menu and was working fine for more than 30min, so I turned off , I take Out again...Today, 12:55 AM
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Hi, I need resistor value at R51 mark at Epson L3210 Power Supply. The model of PSU is Model EPS-167E. R51 is burn, so I didn't get the value. Thanks.05-23-2024, 10:22 PM
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Hi
working on a not turning on Wheelspeed WS1 scooter.
diagnosed - issue is the display/power button
on the board, with the multimeter I noticed there is a short to ground. as the red wire has 0 ohm to ground.
with infrared camera, this chip (photo circled) would heat up if I push power button on.
but I can't find any replacement or online info of this chip.
on the chip you can see it has a label GM2H, I have another good working display with the same chip but it has label GM2C
could anyone help me id this chip and guide me to...05-08-2024, 06:59 PM -
Please, does anyone know the value of the C600 capacitor, on the Gigabyte RX580 Gaming 8gb graphics card, on the v-coreYesterday, 01:39 PM
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Hey, I'm repairing a board from liquid damaged laptop, managed to get 5V and 3.3V rails up, some passives were corroded away. Only problem right now is no reaction to power button, there is no PCH_PWR_EN signal, DPWROK_EC is 2.5V, +1.0VALW is missing. Replaced KBC with brand new one, reprogrammed. No change. Any ideas? Schematic and boardview are available, attached them at the bottom. Boardview file can be opened by "BoardViewer" software.
Please don't mind the damage near UC4, it was caused by liquid damage and there is battery connector on the other side,...05-23-2024, 11:10 AM -
Have laptop motherboard da0zabmb6e0 rev e showing battery not detected problem.while checking have
Pin 3 - 3v
Pin 4 - 3 v
Pin 5 without battery 3 v with battery connected 0v
Pin 6- 0.56v
Pin 7&8 - 8.44v
Have tried new battery and changed bq737
When BATT Detect SW is pressed pin5 voltage goes to 0v
Have traced pin 3 and pin 4 to the it8987e....05-17-2024, 12:34 PM -
Hello
I have lap problems, I leave the bios bin backup
CPU core voltaje 0v
RAM 0v
ok 3v and 5v
charger bat ok
check components there is no short
read led diagnoses
AC PLUG DC > led on white and orange no picture no flashing led
BAT > flashing led white...Yesterday, 12:24 PM -
Hi All,
Anyone able to provide schematics or board view for DAG7HGMB8B0 RE B
Thank youYesterday, 09:50 PM
-
Hello my vacuum cleaner dock died, 0V on output. I replace the caps but still no voltage. I found out that this resistor is broken (showing 0 Ohm) do know the value of this? Is this really 0 Ohm resistor?...Yesterday, 10:07 AM
-
Hello to all, I'm new here on this forum, so I have T-con board that makes me crazy, so when I start to diagnose the problem, on first MAX9591 was overheating so I tried with 1 flat cable from panel and half picture was working and IC was fine, so I take out T-Con I check every capacitor, diode, mosfet, everything was good, so I continue to right board from the panel, I check everything, and I didn't find any issues, so I connected again, I started the Tv with both flats, and TV worked, I tried every settings in menu and was working fine for more than 30min, so I turned off , I take Out again...Today, 12:55 AM
-
Hi everyone!
Hope you're all having a great day, and thank you very much for stopping by and taking the time to read this post to help me with my parents' Samsung TV.
My issue: No backlight.
Model: QE82Q70RAT
Type No: QE82Q70RAT
The TV was already serviced by Samsung once under warranty for the exact same issue, but six months after the fix, the backlight went out again. Now, Samsung is asking for nearly the same price as a brand new TV to fix this with the same 6-month guarantee.
So hopefully, I can fix this cheaper.
...05-22-2024, 06:56 AM -
The actual port is clean, and it is taking a consistent 930 mA, no dips.
Just did a battery replacement, the iPad did not work before either -- plugging in previously did a charging loop but went up to 930mA and down to 0, cycling, but it wasn't beeping at all. That battery is VERY dead, measured something like 24mV or something. So perhaps my replacement battery just has enough charge to make the beep, and the actual problem persists. Could this be a PMIC issue? It is not a Tristar on these but rather an Apple branded IC I believe.
Not that I suspect this matters, but...Yesterday, 06:02 PM -
Hi can anybody help me with a Bios password removal on a ASUS UX425EA-KI560T /N:M6N0LP02P89724B NB2555_PCB_MB_V4
I have searched under Bios guides and Methods, extracted the bios and used a Hex reader to search for the correct string but i simply cant get my head around it.
Original Bios dump attached...Yesterday, 01:54 AM -
Hello all,
I'm working on an Acer Nitro 5 (AN515-54) with motherboard EH5VF LA-501P with a short on the power rail.
I'm just learning board level diagnostic, but here is what I've found so far.
I injected 1.5v to one of the positive leads on the DC jack connector (PJP101) and read about 1.4a to ground.
I felt around for heat and found the MOSFET at PQB12 is rippin hot!
when i pulled the MOSFET from the board the short went away. In my mind it was a faulty MOSFET.
Ordered a replacement and got it installed only to find it gets very hot again and the short returns....05-23-2024, 06:07 PM -
Hi Folks
I've got a friend's LG OLED on the bench (well the dining table given the size of it!). It immediately powers off when turned on and sits in standby. PSU voltages are good and after disconnecting the TCON board there is stable 12V and 22V coming out of the PSU board.
Hunting around the TCON board there appears to be a shorted power rail (DVDD09_CORE) but I'm having issues identifying the component which is shorted. I've attached a picture. It's sitting before the coil so I'm assuming it's a MOSFET of some description, but the markings I can make out don't seem...Yesterday, 06:27 AM -
Hello everyone.
Here is the bypass solution for several Lenovo ECs.
This has worked on many ECs.
Only works if password is contained in EC
I succeeded on many models
[URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/bios-requests-only/104872-lenovo-l15-gen-2-ryzen-password-removal-w-vertyanov-successor?p=3217086#post3217086"]https://www.badcaps.net/forum/troubl...86#post3217086[/URL]
[URL="https://www.youtube.com/channel/UCeF58jC2Bt_adKcguvynjeA"]https://www.youtube.com/channel/UCeF...t_adKcguvynjeA[/URL]...03-17-2024, 11:57 AM -
Hi All,
Anyone able to provide schematics or board view for DAG7HGMB8B0 RE B
Thank youYesterday, 09:50 PM -
motherboard code KV481/KV581/ NM-F051 Rev 1.0
cpu R5 7000 SERİES
S/N.PF4K7WNG
[B]There is no backup[/B]motherboard code KV481/KV581/ NM-F051 Rev 1.0
cpu R5 7000 SERİES
S/N.PF4K7WNG
[B]There is no backup[/B]motherboard code KV481/KV581/ NM-F051 Rev 1.0
cpu R5 7000 SERİES
S/N.PF4K7WNG
[B]There is no backup[/B]05-23-2024, 09:43 AM