Here are photos of both sides. I am sure there are no bad caps. I tried using freezing spray all around the board, but to my surprise behaviour does not change in any way. I have to leave the board unpowered for hours so it will power up for under one minute. Again, nothing heats up abnormally while working or not working. A thermal camera may be actually beneficial, because it is much more sebsitive than our skin and may show some abnormalities to give at least some direction where is the fault.
What I found is actually interesting. Under the EC are some bipolar transistors that...
Rayblaster
Frustrated User
Last Activity: 01-11-2025, 05:54 AM
Joined: 12-30-2024
Location: Skopje
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HP RP7 RP7800 from 2012/2013 worst fault - has "character"
Hello friends, I've got a nice toy to play with - it is an HP RP7800 All-in-one POS system. I got it for free and it has one problem - it turns on very rarely, and just for a few seconds. After that it dies and doesn't come on if I don't leave it unplugged for at least 2 hours. I've repaired motherboards before, this is not my first one, but problem with these types of faults is that everything you check on the board will usually be fine. This is the case for me here.
I dissassembled it completely, and got my hands on the motherboard. Model No. is PIQ67H/Higgins 11047-I 48.3GD02.011.... -
Hi! Nice place to be. Hope you accept me to your big (and at the same time small) family. I always liked to poke with electronics as a kid and I am always starving for new knowledge. Hope I will get help on my repair projects and also I will be glad to help others, if I can contribute in any way. Best wishes from Macedonia!Leave a comment:
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