Legion 5 PRO, 3 boards, same problem, NM-D562 Rev. 3.0 motherboard

[hopkok]

Hi friends, last week I got 3 same boards for repair (NM-D562 Rev. 3.0), same problem, power button light up, but motherboard wont start.

3,3V_alw and 5V_alw, 1,8V_alw and 0,75V_alw presented on all 3 boards, no other voltages. 1,2V missing and if I checked schematic right, I need 1,2V and than can be +3VS and +5VS generated after getting SUSP_N signal from KBC? or vise versa?

I checked for low resistance on coils, no low resistance.

Anyone with same issue like me?

Thanks for any help.

[mcplslg123]

SUSP_N aka SUSP# missing is the most common fault on this mb. has faced same issue multiple times.

Its RYZEN APU which needs reballing. To test just heatup near ryzen for 30-45 seconds(not on top of it) and very likely you will get display.

[hopkok]

Thanks for hint...will try. How about that horrible black epoxy around CPU, is there any good way to lift CPU without pads?

[hopkok]

Hi, I reheated APU, but no change. Can this by KBC issue as well?

[mcplslg123]

Very very unlikely to be a KBC issue. Its very difficult to de solder this apu 'coz of black glue.
Some pcb pads will definitely torn off(specially the side you tried to lift it). however, they are very likely not connected pads.

I still bet for a defective/dry ryzen

[hopkok]

You are right, all 3 boards dead CPU...

[mcplslg123]

Have faced the same issue atlest 10 times on this very board. however, 5 or 6 were fixed.Rest to garbage bin.