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820-02020 Corner T2 Pulsing

prodigy83

prodigy83

Member
My reference: REF1128

Issue: Thermal camera shows pulsing in the Y1 region of the U8100 Chip when initially turned on, but stops after a few seconds. L5800 also I can see warms up during this process. The board does turn on, fan spins, but I get no video on internal or external display. I do get .7v on PPVDD_SOC_S1 so it seems all the other "S" states are present.
I don't get anything for VSNS_VSS_PCPU.
 
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prodigy83

prodigy83

Member
Liquid damage, between UP710 and RV810 the damage is present on one of the traces, looks like one of the slugs between RW080 and RV810. I would not imagine this would affect this? I was not able to get it in to DFU mode but I have not tried to force it. Will try now.
I have also replaced the following:
UP710
CL031
CL052
CL002
CL053
CL003
CL004
CL012
UF400
 
prodigy83

prodigy83

Member
No luck with forced DFU mode however it may be trying to do something. I noticed the USB-C meter remains at 5v until I removed the tweezers and it goes back up to 20v. Also I tried hooking an external monitor back up to it again and it seems to be getting a signal, and then it loses the signal, then it repeats this.
 
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