Switch Mode Power Supply Static Test - LG 42PQ30 Training Manual

Switch Mode Power Supply Static Test (Forcing on the SMPS in sta
Switch Mode Power Supply Static Test (Forcing on the SMPS in sta
Remove AC apply the next
step and then reapply AC
(A) Ground the Auto Ground (Pin 22) on P813
(B) When AC Power is applied, Check AC Det (Pin 18) and 5V Stand-By (Pins 9 ~ 12) are 5V.
(C) 100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12)
to RL ON (Pin 19) closes relay RL101 and RL103 turning on the 17V and 12V Supplies.
(D) 100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to M5 ON (Pin 21) brings the M5V (P811
pins 9, 10) line high.
(E) 100Ω ¼ watt resistor added from 5V STB (Pins 9 ~ 12) to VS ON (Pin 20) brings the VA and VS
(P811 pins 1 and 2 Vs and Pins 6 and 7 Va) Lines high
40 Preliminary Information 42PQ30
ges)
ges)
P811 disconnected from the
Power Supply.
P813 disconnected from the
Main PWB.