A failure in the 5V standby circuit is the most common fault in these boards, typically caused by the degradation of the input electrolytic capacitors.
: Often found in the corner of the board (e.g., "Quanta R53"). Hannstar J Mv-6 94v-0 Schematics Pdf
The "94V-0" designation in the title is not a model number but a UL (Underwriters Laboratories) flammability rating A failure in the 5V standby circuit is