MSI B660 MORTAR NO DISPLAY

[mo000]

Hi!
MSI B660 MORTAR MS-7D42
the problem start when the client broke some capacitors and resistors in Back of the motherboard under PCH
i put them back but
same thing
motherboard power on with no display after press the pwr button power on with dram led and restart and power on again with red cpu led
cpu vcor looks good no short and cpu heat up but after second restart not heating
i found 2 shorted transistor near to KBC but i doubt if that normal short or not (connected to AGND AND AMDSIC)
other technicien flash the bios but same thing .

[DynaxSC]

If board is going to lit DRAM LED this means that Bios is read by PCH, processor, PCH and SIO are working and speaking to each other, otherwise this would not happen.

Check power supply of DRAM (1.2V and 0.6V), maybe 0.6V is missing, assumed this is a DDR4 board.
Another reason could be bent or dirty LGA pins or dirty processor pads.
Potentially could be also a problem with communication between PCH and DRAM there is a 2 lines serial bus directly between PCH and DRAM (might go through some mosfet keys) to allow read the memory spi chip data of the memories.
Sometimes the first DRAM check after CMOS reset can last a minute or more, did you wait long enough ?
Last but maybe not least unsupported memories, or processor unsupported by the BIOS.
Some more parts ripped off ?
If nothing of that finally can also be a partially broken PCH, seen a lot of such cases, if board if behaving strange, this can indicate an issue with PCH. This can be proven only with exchanging PCH and should be the last option as PCH is expensive, and the process of exchanging very difficult.

[mo000]

If board is going to lit DRAM LED this means that Bios is read by PCH, processor, PCH and SIO are working and speaking to each other, otherwise this would not happen.

Check power supply of DRAM (1.2V and 0.6V), maybe 0.6V is missing, assumed this is a DDR4 board.
Another reason could be bent or dirty LGA pins or dirty processor pads.
Potentially could be also a problem with communication between PCH and DRAM there is a 2 lines serial bus directly between PCH and DRAM (might go through some mosfet keys) to allow read the memory spi chip data of the memories.
Sometimes the first DRAM check after CMOS reset can last a minute or more, did you wait long enough ?
Last but maybe not least unsupported memories, or processor unsupported by the BIOS.
Some more parts ripped off ?
If nothing of that finally can also be a partially broken PCH, seen a lot of such cases, if board if behaving strange, this can indicate an issue with PCH. This can be proven only with exchanging PCH and should be the last option as PCH is expensive, and the process of exchanging very difficult.

i found one broken pin may this pin make this problem ?

[DynaxSC]

Unfortunately not, this is a VCORE pin, one of many, and is redundant.
See attached printscreen from a different MSI Z690 board, all LGA 1700 pinouts are the same.