820-00923 stuck at 5v

[laptopcity]

Hi this is a strange one i have an 820-00923 stuck at 5v (Not strange yet) changed changed u7000 tested had 19v booting up , fitted in laptop back to 5v , took out and reflowed u700 incase it didnt sit properly, back to 19v , fitted in laptop back to 5v ,took out and changed u700 back to 19v , then i stopped for a cuppa and when i went back to it its back to 5v . Anyhow it turns out if i warm that part of the board it goes to 19v and then when it gets cold it gets stuck at 5v. Before i pull my hair out has this happened to anyone else ?

 

[2informaticos]

Any history available?
There could be accumulated crap under SMC, or CD3215 chip.
All 4 ports have the same behaviour, in both charger directions?

 

[laptopcity]

just came in as dead , no signs of spillage at all, but had been to another repair shop but couldnt really see any signs of the board being worked on , i did change all 4 cd3215 chips but 1 has steady 5v the other 3 cycle , same both directions

 

[2informaticos]

The problem should be located on the fixed 5V port.
The other cycle because the board tries to start.
Compare diode mode readings on LDO outputs between CD3215 chips.