In case anyone is interested, after investigating lots of hours, I found out that the buck was starting but went down some miliseconds afterwards. I realized the 12v after the U76 was lost, loosing also a 5v line apart from the buck. It all was related. Tried bypassing the U76 and the buck continued up but the NAS didn't boot, kept having no leds still. I then checked the BIOS communication with the help of an oscilloscope and I realized the communication was weird, moreover, the PLTRST# signal was lost after the pulses I saw, so I decided to overwrite the BIOS and it ended up booting up. I also...

Hi guys,

I have a dead NAS QNAP TS-453Be which I'm trying to fix. The board is tagged as QY47 REV 1.6 20008-A02112-HT-10-RS

I've not found any schematic or boardview, so I'm flying blind. I'm analyzing it as I would have done with any other PC or laptop motherboard and I'm using as a reference the boardview from an AsRock J3455-ITX board I found.

I started checking all buck converters and they're all running except one that looks it's going to the CPU. The buck is composed of a RT3601EA and mosfets H8324 and H8334. I've meassured the mosfets and they look...

really? should be open line to GND for all HDMI lines? Bad news...

I've found replacement boards at ebay at 170-200€. Not so expensive for the cost of a new TV like this one, but wanted to try getting this board back to life

Not really, the PS5 doesn't look that burned, only HDMI related components, the APU looks good. I've not continued working on it because I cannot buy a replacement for Richtek RT6575K which is burned...

As far as I know the PS5 was not connected using ethernet. Does it make any difference?...

Thanks a lof for toour reply lotas

I'm 90% sure the dischage went through the HDMI port because he also gave me a PS5 pro which has the power supply fully burned and also the HDMI 0.9 regulator IC and the HDMI controller MN864739 were shorted/burned. This PS5 was connected to the TV at that time.



Resistances to GND from top to bottom (meassured from the left of the resistantors):

• 44 Ohm
• 9.5 Ohm
• 240 Ohm
• 647 Ohm
• 3.9 Ohm
• 6.7 Ohm
• 8.5 Ohm
• 42 Ohm

The HDMI ports are directly connected to the ARM CPU. Do the resistances meassured look correct?...

Hi guys!

I'm trying to repair a TV that a friend gave me recently. Lightning struck next to his house and broke the TV apart from more electronic devices.

First of all I've checked the power supply and it works as expected. I removed the logic board and shorted the 3.3v standby output to TCON_ON and POWER_ON and every voltage was generated as expected (12v and 25v for logic board and 32v for TCON).

When trying to boot the TV normally (having the board connected), the TCON_ON signal is not generated from it which made me think there's some issue in the logic...

For anyone interested, finally I think I've found the model, Richtek 6575K --> https://www.badcaps.net/download/?id=73b61b5d

Sadly it looks like it cannot be bought. I've not found it in any online shop :/

Hi guys,

I have a PS5 pro board model VSM-010 which doesn't boot, when trying to start the console, it beeps once and the blue light is shown for one or two seconds and shuts down.

I've been checking it, the UART showed the following errors:

• 00 27/09/2025 1:25:53 80810001 Severe PowerSequence - Power Sequence Error - General Power Failure (Peripheral, GDDR6, APU, Data Line Short)
  |-(OK 00000000 80810001 FFFFFFFF FFFF0023 10000100 206E 0024 FFFF FFFF:2E)
  Click for TSB Information
• 01 27/09/2025 1:25:53 C0810303 Low HDMI IC Problem or Data Line Short or

...