Troubleshooting Guide - LG FPD2200 Service Manual

PW364A(U7)
INPUT POWER
CHECK
U39(3.3V)
U29(5VST)
U6(2.5V)
GND

TROUBLESHOOTING GUIDE

1. OUT OF ORDER ON POWER
POWER LAMB OFF STATE
ADAPTER CHECK
(15V)
KEY CONTROL CHECK
74LVC541(U25) CHECK
CONN(J19) CHECK
KEY_CONTROL CHECK
M29W800AT(U9)
INPUT POWER
CHECK
U39(3.3V)
GND
OTHER CIRCUIT CHECK
(REF)
U39 (LM2676-3.3) : INPUT(15V), OUTPUT(3.3V)
U29 (LM2676-5)
U6 (LM317EMP) : INPUT(5V), OUTPUT(2.5V)
U35 (IRF7314)
- 17 -
INVERTER
INPUT POWER
CHECK
U8
--> U35
--> 15V_INV
GND
CONN(J21) CHECK
INVERTER CHECK
: INPUT(15V), OUTPUT(5VST)
: 5, 6PIN OUTPUT (15V_MOD)
7, 8PIN OUTPUT (15V_INV)
MODULE
INPUT POWER
CHECK
U8 --> U35
--> 15V_MOD
GND
CONN (J4) CHECK
MODULD CHECK