Advertisement
EN 12
5.
LGE PDP 2K5
Control Board (see figure "Control b/d trouble shooting")
1. Check LED status (normal status lightening or not)
2. If not, check OSC X1 output.
3. Check CTRL input voltage (connector P10).
4. Check each FET (3.3V, 5V, and 1.8V).
Input voltage
Probe
touching
OSC(X1)
point
Check oscillating state.
Be careful with physical shock.
Figure 5-9 Control b/d trouble shooting
Vsc check point
(measure over R53)
Vset_dn
adjust
Vset_up
adjust
Service Modes, Error Codes, and Fault Finding
LED's
5 V
3.3 V
1..8 V
DMM – (GND)
Check FET
F_15590_072.eps
060705
Figure 5-11 Y-SUS b/d trouble shooting
Y-SUS Board (see figure "Y-SUS b/d trouble shooting")
1. Check fuse: FS1 (5V), FS2 (Vs).
2. Check voltages (Vsetup, -Vy, and Vsc).
3. Check diode between GND and Y-SUS output.
4. Check whether output voltages agree with voltages on the
label.
Normal diode value= 0.6 (forward)
Figure 5-10 Y-SUS board output diode check
Vy adjust
(measure over R78)
Normal diode value = OL (reverse)
Vy check point
Vs fuse
5V fuse
F_15590_073.eps
060705
F_15590_074.eps
290605
Advertisement
