There is MBX-237 that on power IC (SN0608098) we have 19v on 6th pin. and 13v on 4th pin(EN_LDO). but not any of vreg2, vreg3. LDO produced. I changed by new one(sn0608098), nothing changed. I am suspecious on 4th pin voltage(13V). 13v is logic high level range or not? I wnat to know that SN)608098 Sense EN_LDO or not? I think If I drop PR324 and toss 3v on 4th pin by lab power supply, mybe we have LDO(5v) on 7th pin. please help.

chek all resistors around the stby ic

I found it, LDO line was short, then tossed a 3 v on it, SMSC KBC heated, I find the problem.