Troubleshooting Guide - IBM L200P Service Manual

PW166B(U8)
INPUT POWER
CHECK
U20(3.3V)
GND

TROUBLESHOOTING GUIDE

1. OUT OF ORDER ON POWER
POWER LAMB OFF STATE
POWER CHECK
KEY CONTROL CHECK
CONN(J6) CHECK
KEY_CONTROL CHECK
M29W800AT(U9)
INPUT POWER
CHECK
U20(3.3V)
GND
OTHER CIRCUIT CHECK
(REF)
U20 (L4973)
U34 (IRF7814)
- 11 -
INVERTER
INPUT POWER
CHECK
U34(18V)
GND
CONN(J1) CHECK
INVERTER CHECK
: INPUT(18V), OUTPUT(3.3V)
: PIN OUTPUT (18V_MOD)
PIN OUTPUT (18V_INV)
MODULE
INPUT POWER
CHECK
U34(18V)
GND
CONN (J4) CHECK
MODULD CHECK