I would like some help with this MacBook if possible. It came in with not turning on and the Magsafe light was off. After inspecting the logicboard i cannot find any liquid damage and also no burnt or shorted components.
took some measurement and i can see i have fluctuation on PP3V3_S2 and also PP5V_S2_MAIN amongst other rails. Using the thermal camera RC282 & RC283 were pulsing, but after removing these it was still the same.
I then did some investigation into why the rails were pulsing and noticed that P5VS2_PWR_EN (comes from U8100) is also doing the same thing.....
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-
11-18-2024, 03:36 AM
-
I suspect the issue is with the power supply Liteon PS-3261-9DA as apparently they are notorious for issues with them. Has anyone else had similar issues where the PC tries to boot up a few times before finally booting up. Now I have opened up the PSU which shows no signs of any capacitors failing. I did remove one capacitor that looked to have an issue however with my peak meter it showed it was within the limits with good very low esr values which was somewhat disappointing!
I am going to put a Meter leads across the outputs to see how stable they are when it occurs to see what they are...Today, 06:52 AM -
Searched online but wasn't able to find. Trying to locate a copy of this document - AutoLeap Oscilloscope Handout.11-18-2024, 10:09 AM
-
Hello friends, I got this device with a bios that was stuck and wouldn't install Windows, I'm trying, but so far I haven't found a compatible bios to be able to record and solder on the machine, I'm counting on your help again.
Lenovo ThinkCentre Model M70q type 11DU
Board NM-C621
Chip GIGA DEVICE 25B127D
S/N: PE07K70KToday, 03:59 PM -
Hi Everybody,
I have three 820-00840 main with almost the same problem. They all are breezed at 5V state.
There were other problems before i fixed them.
So,
First of all, I used [B]PCD3215A10[/B] instead of [B]CD3215C00[/B], which I have bought on Aliexpress.
On the first board, I have mixed PCD3215A10 and CD3215C00.
in spite of I checked everything according Mon2 article [url]https://logi.wiki/index.php/CD3215_Bootup_Sequence[/url] (Thank you)
First board has constantly pulsation between SMS and U3200 on the [B]SMBUS_SMC_4_G3H_SCL[/B]...Today, 09:31 AM -
Hi,
my 7590 spontaniously rebooted and showed "workshop mode press ALT-F" in BIOS post, then worked normally for two days, after shutdown a few hours later is dead and doesn't power on.
After a few hours of measuring I didn't find anything obvious, although the 2.5 Ohm measured might be too low, but I never fixed a notebook before (only other things like TV power supplys)
Found the boardview cad and schematics in this forum.
Voltages +1VALW, +3VALWP, +5VALWP, B+, +SDC_IN, +3V_PCH are ok
+3VS and +5VS is 0 because signal RUN_ON_EC is 0 and UZ1 doesn't...Today, 02:31 PM -
Got a Kenmore Kenmore 790.74133311gas range with a control board 316630005 which has a blown PWM. Anybody has an idea what that chip is?...11-13-2024, 01:43 PM
-
hello
laptop hp zbook g3 la0c381p no power
PR315 pin 1 and 4 there is 4 volt
when i remove pr315 pin 1 and 2 = 19 volt
but pin 3 and 4 still 4 volt
pl59 = 450 om
pl39 = 400 om
pl40 = 420 om
pl37 = 550 om
no short on there coils
i flash 2 bios ic no new
i ve 2 laptop same problem
please help
and sorry for my english...Yesterday, 01:58 PM -
Hi Everyone I have a 3 Hp Zbook 15 g5 with motherboard DA0XW2MBAG0 REV-G, the problem at first was because the audio driver was not installed in the bios, the audio was working but in Windows it was not installed, after many attempts to fix it, I thought it was a bios problem because the IC was made elsewhere. I try to program another bin, the laptop does not turn on, it just blinks orange in charging port. I try to write backup, but again the laptop blinks orange. The welding is fine because I have tried many times, I have tried with another chip but no solution. I check its ic has 3.3 v. Please...11-09-2024, 02:41 AM
-
hello,
I'm trying to identify this component, by it's a mystery!! Infinite resistance, not a capacitor and when I test it with a T7 or with a multimeter I measure 620 mV like a diode!
Can someone help me, because I need to replace it on an other board that was corroded?
Thanks by advance...Today, 12:08 PM
-
Hi,
my 7590 spontaniously rebooted and showed "workshop mode press ALT-F" in BIOS post, then worked normally for two days, after shutdown a few hours later is dead and doesn't power on.
After a few hours of measuring I didn't find anything obvious, although the 2.5 Ohm measured might be too low, but I never fixed a notebook before (only other things like TV power supplys)
Found the boardview cad and schematics in this forum.
Voltages +1VALW, +3VALWP, +5VALWP, B+, +SDC_IN, +3V_PCH are ok
+3VS and +5VS is 0 because signal RUN_ON_EC is 0 and UZ1 doesn't...Today, 02:31 PM -
hello,
I'm trying to identify this component, by it's a mystery!! Infinite resistance, not a capacitor and when I test it with a T7 or with a multimeter I measure 620 mV like a diode!
Can someone help me, because I need to replace it on an other board that was corroded?
Thanks by advance...Today, 12:08 PM -
Please can someone help me, im trying to find the shorted component as i have a donor board that i can swop components from.
If i inject 2V/2A on DC in PU4201 gets really hot. ive changed out PU4201 from another board as well as a couple other Mosfets but PU4201 still gets crazy hot when i inject. Any ideas? im still a noob so am learning....Today, 10:59 AM -
Hello friends, I got this device with a bios that was stuck and wouldn't install Windows, I'm trying, but so far I haven't found a compatible bios to be able to record and solder on the machine, I'm counting on your help again.
Lenovo ThinkCentre Model M70q type 11DU
Board NM-C621
Chip GIGA DEVICE 25B127D
S/N: PE07K70KToday, 03:59 PM -
Previous owner said TV just went blank one day.
They attempted to open the back panel and yanked the power connector off the power supply in the meantime.
Easily fixed that and got the TV to turn on. Backlights come one with everything connected. Good Sign.
The mainboard shows signs of life (red light on digital audio out is on) but that's about it. Good Sign.
There is not blinking LED and the most importantly there is LED response and sound when I press the MENU button on remote control. GREAT Sign.
I just downloaded the [URL="https://www.manualslib.com/manual/3362173/Sony-Kd-75x7800f.html"]Sony...Yesterday, 10:12 AM -
Hi, i want password removal of Lenovo Thinkcentre M70q please.
The board is iq6x0il2.
I attach the bios bin.
Should i upload the second bios code? (ec)...Today, 02:16 AM -
Hi guys I have this tv with this problem, I found it one strip led broken so I decided to change all of them (4) but the problem remains, the tv turn on wit sound led on but after second rebottet and then give me red led blinking (6 times) probably is something in the board broken, i replaced some capacitor that have lower value , take some measurements you're will se on the picture, but I don't have any schematic for this tv. Every reply is accepted! Thank you11-11-2024, 12:07 AM
-
Hello,
I have this All-in-one PC, after SSD change there is no picture. I was found out it is a backlight problem, but LEDs are OK. There is 4 led strings each working on 42,4V, but from board is comming only 5V.
I was repaired many backlights before but this design i will not understand.
For me it looks like it is waiting for some signal from screen to start up the backlight or something like this. Nothing seems to be damaged or shorted here.
Can someone explain me please what to do, what to check?
Thanks....Today, 01:24 PM -
Hi Everybody,
I have three 820-00840 main with almost the same problem. They all are breezed at 5V state.
There were other problems before i fixed them.
So,
First of all, I used [B]PCD3215A10[/B] instead of [B]CD3215C00[/B], which I have bought on Aliexpress.
On the first board, I have mixed PCD3215A10 and CD3215C00.
in spite of I checked everything according Mon2 article [url]https://logi.wiki/index.php/CD3215_Bootup_Sequence[/url] (Thank you)
First board has constantly pulsation between SMS and U3200 on the [B]SMBUS_SMC_4_G3H_SCL[/B]...Today, 09:31 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