Original post by: W1ngl3t ,
QNAP TS 253A dead motherboard - need help with diagnosis
Hi All, I seek your help on a QNAP TS 253A (network attached storage) motherboard. I bought this device broken, so I don’t have much history on it. The problem is simple: it will not turn on. No LED’s, no nothing. I have disassembled it hoping it would be a simple fix, but I lucked out and I’m running out of ideas. Here’s what I have done/determined thus far: # 3.3v, 5v and 12v rails are alive. (external PSU provides the 12v) # The board is pulling 0.25-0.26 amps # The caps (buck converters) above the CPU (green box in the pic) are measuring 1v. # I have removed the bios battery thinking it could be a frozen bios, but no # I noticed one of the two ethernet chips (intel i210) was steaming hot, so I have removed it from the board. This is highlighted with a red rectangle on the back side of the board. # When I plug the ethernet cable in, the yellow network LED comes on # Prior to removing the ethernet chip I think I felt the CPU getting warm on a couple occasions # One of the buck converters (red rectangle on front of board) does not appear to be outputting anything (could this be the 1.5v for the RAM?) What I am considering doing: # Replacing the ethernet chip, because maybe the Super IO (ITE it8528e) needs a signal from both ethernet chips? # Replacing the Super IO # Injecting a few amps into the dormant buck converter to see if there’s a short Front pic: [image|1876445] Back pic: [image|1876443] Any help is appreciated. Thanks a bunch!