board after start show 00 post code - where to search for fault

[ktmmotocross]

Hello.
Have some boards that shows 00 post codes when started. flashed bios, check voltages. I suspicious chipset dont comunicate. Any hint?

[DynaxSC]

There are a 100 reasons possible for that. Have already given some tips here:

https://www.badcaps.net/forum/troubl...but-no-display


To give an example, I had once a board with same symptom, the reason was one bloody 0402 mlcc cap with a short in the power sequence logic. I found it by using root cause analysis tracking back the signals having wrong statuse to the source of the problem. But this is one of 100 possible reasons. Often also partially demaged chipsets are the reason - yes, this is possible and is not so seldom. Eg. I recently got a board which started to work by pressing down the chipset solicon with a finger. Thaught it needs reballing, did it twice, but did not help. That means that the chipset is demaged internally, some signal did not conduct, eg. a bonding of the chipset carrier board to the silicon is not reliable. Pressing helps, heating helps for a moment, but then it gets back to non-working condition. Chipset must be replaced even though it is principally ok.