Lae791p Rev 20 Schematic Better May 2026

| TP Name | Signal | Location | |----------------|----------------------|------------------------------| | TP1 | +PWR_SRC (19V) | Near PF1 | | TP5 | +3VALW | Left of EC | | TP9 | +5VALW | Near USB connector | | TP12 | PM_SLP_S3# | Under PCH (small pad) | | TP19 | PLTRST# | Next to SPI flash | | TP28 | EC_RSMRST# | Near EC pin 96 |

A standard schematic found in a Service Manual is usually sufficient, but a "better" schematic for repair purposes includes the following proper features: lae791p rev 20 schematic better

The power supply ticks every second. Voltage jumps, then drops. | TP Name | Signal | Location |

VIN (19V) → PU3 pin 15 (VIN)  
           → LDO3 → +3VLP (pin 13 VREG3) → EC_VCC  
           → LDO5 → +5VLP (pin 12 VREG5)
EN_3V5V (EC pin) → PU3 pin 14 (ENLDO)
Once EN_PWM low→high:

→ VOUT3 (pin 19) → L3 → +3VALW

→ VOUT5 (pin 9)  → L5 → +5VALW A standard schematic found in a Service Manual
PG_3V5V (pin 17) → EC_SYS_PWROK