Hello everyone,
This is my first post after browsing this wonderful treasure trove of knowledge for many, many evenings. I've decided to learn how to fix these things, properly.
My patient is an A2338 Macbook Pro M1 (late 2020).
It had some corrosion around JT710 and JT700 caused by liquid spill, as well as against the protective barrier around the USB-C chips UF000 and UF100. So I took the main board out and cleaned it with a toothbrush and alcohol, then with alcohol in an ultrasonic cleaner. Cleaned the touchbar flex connectors as well. The board looks...
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04-22-2024, 06:45 AM
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Got something new. Recently I got trouble with receiving emails and syncing OneNote. Nothing else. I still can stream 24x7, VOIP, have full speed internet, but in the world cannot receive any emails nor sync OneNote. Take the computer somewhere else to a different internet location and no problems at all.
Points to the router, right? NOPE! 
Hooked up my computer directly to the modem (which is in bridge mode) and have the same problems! 
Put all the network shit back together, start my VPN provider app, choose the closed VPN server to me and all the problems are gone! 
Is...
Yesterday, 06:16 AM -
Hi,
Anyone has a circuit diagram for this Samsung Power supply pls?
QP801CS shorted. Blu Cap is not cracked.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3265690}[/ATTACH]Hi,
Anyone has a circuit diagram for this Samsung Power supply pls?
QP801CS shorted. Blu Cap is not cracked.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image...Today, 03:58 AM -
have been looking at earth leakage clamp meters and its like a minefield out there . i wondered if anyone here had bought one that actually works properly ?...04-17-2024, 01:31 PM
-
Dear forum,
I'm stuck with this old TV unit.
PSU: 17PW04-1
MB: 17MB62-1
Symptoms:
- Blue LED constantly blinking when connected to AC.
- Only sigh of life is beeping when touching the capactive buttons on the front.
Diagnostics so far:
Checked the PSU output voltages:
12V present
5V present altought its only around 4.2V
3V is present measured 3.4V.
I check TP 202 which is for the short circuit protection: 0.606V on diode mode
Since I met with some vestel models before with similiar symptoms...05-03-2024, 03:18 AM -
polaroid TQLHD24PR004 no power
hi, my tv no longer starts like dead, no standby led
motherboard : MS36639-ZC01-01
panel : V236BJ1-P01
flash spi: GD25Q64
need usb firmware or to reprogramYesterday, 08:40 AM -
I've several amplifiers of different sizes which are faulty. I haven't fixed them because I haven't a clue. This is the smallest culprit. 240v in (UK) and 12v dc to the board. Small neon lights when power button is on. Different dc voltages across all of the capacitors. Where do I go from here?04-25-2024, 04:43 AM
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does any one here have SCH & BV for 820-02655? I see it's available on the webToday, 02:49 AM
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Hello BadCaps Forum! I'm new to the group and hope you guys can help me with something. I have a 2017 Apple imac A1419 board # 820-00609-A that i'm trying to identify a capacitor failure on. The capacitor is a tantalum 68 C79. See pic attached. I've tried to figure this out using the web and unfortunately can't find the information. Can someone tell me what the Capacitance value, voltage, etc is for these 68 C79 caps are? Where could i pick up a replacement? Thanks in advance!!...05-03-2024, 04:00 PM
-
bios for laptop model: Aspire one 1-132
snid: 62504891276
probleme : error: turn on but not boot even to the logo
Thank You...Today, 02:26 AM
-
Hello, this Asus laptop model FA707NU-DS74 has password which prevents computer from booting past it.
S/N: R3NRCX04A476126
I extracted current BIOS from a chip XMC 25RU256CXIQ (1.8V) sitting close to the CPU heatsink.
Please, help me remove the password. Thank you....Today, 01:30 AM -
Hi,
Anyone has a circuit diagram for this Samsung Power supply pls?
QP801CS shorted. Blu Cap is not cracked.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3265690}[/ATTACH]Hi,
Anyone has a circuit diagram for this Samsung Power supply pls?
QP801CS shorted. Blu Cap is not cracked.
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image...Today, 03:58 AM -
Hi All
Been a while since I have been here, and a bit rusty.
I have the above laptop motherboard that was working and now the charging circuit is faulty.
Have 19v in fine until it hits PU4403 - not shorts I can see and thermal cam reveals nothing.
I have swapped out the ISL9538 and also the two mosfets (PU4403 and PU4405). Have 2.8v at the power switch, which pulls low when pressed - charging light comes on and goes straight off
Below are measurements (pin names are per the datasheet for the ISL95338 (couldn't find one for ISL9538,...05-03-2024, 03:25 AM -
does any one here have SCH & BV for 820-02655? I see it's available on the webToday, 02:49 AM
-
polaroid TQLHD24PR004 no power
hi, my tv no longer starts like dead, no standby led
motherboard : MS36639-ZC01-01
panel : V236BJ1-P01
flash spi: GD25Q64
need usb firmware or to reprogramYesterday, 08:40 AM -
The laptop won't start. When plug power supply, on 19V in gives me 0,14A, without turning on the laptop.
I check it with thermal camera, and there is one resistor that is very hot, I change the resistor with new on but the result is the same.
In the attachment there is schematic of the resistor area, and schematic of the laptop.
I can't understand, why this resistor is getting so hot....Yesterday, 01:24 AM -
bios for laptop model: Aspire one 1-132
snid: 62504891276
probleme : error: turn on but not boot even to the logo
Thank You...Today, 02:26 AM -
See the attached drawing of the chip I am trying to identify. I think the last character (the 'H') may actually be the manufacturer logo, but I am not sure.
This chip is part of a hand held device that detects metal. Its called a pinpointer, and is used in the metal detecting community. The chip is located on the main power rail which is from a 9 volt battery, noted in the drawing.
I tried many searches to find the part, but did not see anything that looked close. But then I have very little experience doing this and I could have easily missed something obviou...Yesterday, 07:27 AM -
Please help sir, this board does not turn on because VSYS_OUT is 9.2v, I compared it with a normal board VSYS_OUT is 10.2v, I have replaced the PQ101 and PQ102 mosfet and BQ 25700 which is known to be good, but the results are still the same, thank you
VSYS_OUT 9.2v Meter in resistance mode auto range 6M ok
NORMAL BOARD 10.2V
PQ101
PIN 2 20V
PIN 7 0.004V
PIN 6 6V
PIN 5678 0V
PQ102
PIN 567 0V
PIN 9 0.004V
PIN 234 9.2V (VSYS_OUT)
PU101 BQ25700ARSNR
1 VBUS 20V
2 ACN 20,21V
3 ACP 20,21V...Yesterday, 05:30 AM -
Hello. Please help. la-g07jp rev1.0 does not turn on. The 3 and 5 volt alarm goes up for 2 seconds and goes out. I opened the 3 and 5 volt power jumpers, removed the pu302, flashed the multimcontroller with different firmware, nothing helped. I noticed that on the u4104 the output is 1.5V, this voltage goes to the combined processor. Should there be such tension there?Today, 01:01 AM