Dead Motherboard Repair Help - Page 1
Forum section: electronics / repair

author: Trouble_Maker023
author_rank: Newbie
timestamp: January 25, 2021, 10:05:04 pm
content: Hello this is my first Post here, I hope some of you can help me.Today my Motherboard died, my GPU Blew out its Buck Converter on the Back of the Card and took the whole System with it.To Troubleshoot I put my Multimeter in Ohm Mode and tested the ATX 24 Pin Connector, no major Shorts were detected, the 3.3V Line had around 300Ohm and the 5V and 12V Line had a couple thousand Ohms.Upon plugging in the ATX Cable the PSU briefly power on, put immediately shuts down again.To see what parts get hot upon powering it on, i have taken a picture with my thermal cameraMy Motherboard is a Gigabyte GA-H87-HD3I have no experience diagnosing Desktop motherboards thus help would be highly appreciated

author: Rasz
author_rank: Super Contributor
timestamp: January 25, 2021, 11:22:14 pm
content: that thermal picture is with no cpu. Board wont power without it, part of the powergood circuit checks CPU voltage railsedit: wait, where is your cpu retaining bracket?

author: drussell
author_rank: Super Contributor
timestamp: January 25, 2021, 11:51:41 pm
content: Quote from: Trouble_Maker023 on January 25, 2021, 10:05:04 pmIt is probably way more likely that your power supply had a conniption, died and over-volted a rail or something, blowing up the rest of the system in the process.

author: PKTKS
author_rank: Super Contributor
timestamp: January 26, 2021, 01:30:08 pm
content: Yes like said above you should power the system with CPU on board...But nevertheless your thermal picture is very suspicious...YOUR PCH CHIP (the chip with hottest spot..) seems way too hotfor a board like this...Usually 2 CHIPS are most likely to fail isolated or together.- PCH- Super I/OYour Super I/O is dead cool while the PCH (call it Northbridge Southbridge..INTEL lingo is crappy) is way too hot...Several reasons ... if failed.. a BGA is required.Put a crappy CPU and try to stand by ... take the thermaland Super I/O voltage readings..3.3V LDO regulator..5V Stbyare requiredPaul

author: Rasz
author_rank: Super Contributor
timestamp: January 27, 2021, 09:22:43 am
content: Quote from: PKTKS on January 26, 2021, 01:30:08 pmcant tell without scale/patelle visible

author: Gyro
author_rank: Super Contributor
timestamp: January 27, 2021, 10:31:03 am
content: Yes, a good example of technology telling you nothing. Those 'hot spots' could only be a couple of degrees warmer than the rest of the board. Note that there seems to be a thermal reflection (OP's skin temperature?) at the bottom right [Edit: and also on the CR3032 lithium cell].(Note that the thermal image is rotated -90').

author: PKTKS
author_rank: Super Contributor
timestamp: January 27, 2021, 02:16:47 pm
content: Quote from: Rasz on January 27, 2021, 09:22:43 amLook the Super I/O... dead cool...Now consider .. .if the Super I/O is dead cool...How can the PCH receive the EN_able signal and turn ON ?Therefore it is reasonable to assume something odd is turningON PCH and totally OFF the Super I/O.. (not even the 3V to thepull up start switch appears as "hot"...)Something ODD is keeping PCH "HOT" and Super I/O dead cool.Whatever temperature it is... it is oddPaul