Samsung OLED QN77S90 Bad Power Supply

[cheebster]

Hello, picked up this tv a nice Oled QN77S90. However, it's blowing fuses like crazy (got the whole room lights go out the first time). So i digged and it seems this tv has the BN44-01264A PSU that often fails. However, replacements are costly (samsung replaces it for the BN44-01329A revised psu).

I'd like to troubleshoot that one. Here is a picture of it, but honestly i don't know where to start. It blows a 12A fuse in a split second, it's really a hard short on this one. Thanks for any guidance ! ...

[mrtek]

Hi I just picked up a Samsung QN50Q6DTA. The issues was a 2 red flashes on the power button as the TV tried to turn on. Power supply OK. Backlight LED OK. If I remove the data cable from panel , sound is ON. I was able to identify the issue within one side of the panel. Used the tape fix and I placed the tape on 4 pins on one side of the flat cable. The TV ran great for 4 days and then the same problem appeared again...2 red flashes on the power button LED. Took the back panel off again and this time mode the tape on a different location and now the TV is running again. Am I missing something?...

[Peter_1402]

Hi,

Is it impossible to flash Asus TUF B450M-Plus Gaming BIOS(25LB128D) with CH341? I have done it with H270N BIOS.
I used NeoProgrammer and selected 25LQ128C IC since 25LB128D is not in the chiplist.dat. I get no response from IC.
Any expert can help on setting up the import.xml so that I can import 25LB128D into chiplist.dat.

Thanks in advance.

[adik246]

Hello, I have problem with this laptop, i change IT8227E-192 CXA KBC in this laptop and when I connect battery and Power Supply it doesn't start. Only fans are spinning for few second and stop and again and again. There is flashing orange battery charging indicator. When battery is disconnected fan start only once then starts but there is no display.

[ribcage]

Hi, could anyone tell me where on this board is 1.5 V generated? Looking at it's reading from the monitoring chip, it seems to have dropped over time, and is often at 1.406 V, while the datasheets for the chipset say the minimum is -5% or 1.425 V, if I understand them correctly. Maybe this is the cause of ocassional crashes for me.

...

[bumper1]

Razer Blade 15 RZ09-0328
MOBO: DA550-MB MP V4.0 20200227

[femin]

Hi,

Could you help me to find the Voltage rail IC PU301 model
Multimeter continuity model shows short after the PU301 IC and to the whole ram slot is short to ground
...

[bumper1]

I have Razer Blade 15 RZ09-0328 MOBO: DA550-MB MP V4.0 20200227 with liquid damage.

I need to know value of resistor on photo. Thanks for help. ...

[dutchgaucho]

Dear Badcaps companions,


We got an Acer Predator Helios for repair that's missing the VBIOS chip (UV2). I already figured out that the chips is a Winbond W25Q16JWSSIQ so we're looking for a 2MB dump that's no where to be found.
The Acer website listst some VBIOS updates, but they are EXE files and they somehow seem to be compressed or encrypted. I have knowledge of BIOS but not much of VBIOS. Is there somebody out there that can help me?
https://www.acer.com/nl-nl/support/p...sn=21205450234

Serial number:...

[DonEvenKnowMe]

Hi all, I'm newbie, i have a customer's laptop that is ASUS G733Q-RHG062T can turn on can charges, but unable to boot any bootable drive / usb , during boot just black screen only, tested different ram and different SSD still same problem. Any idea which part i can start diagnose?