LG 50PC1DA-EC (CHASSIS:PD61A) Service Manual ▷ View online
- 17 -
TROUBLE SHOOTING GUIDE
1. Power Board
1-1. The full flowchart for the voltage output
Start check
Manufacture’s model
passage
1. Check the Power Off
status.
Does the whole
screen appear?
screen appear?
Is it
identical to when the
power is off?
No
Yes
No
Yes
Yes
Yes
Yes
2. Check the Interface
signal status.
Is the Interface
signal operating?
Yes
3. Check the St-by 5V
signal circuit.
Does the
low pressure output
appear?
Does the
St-by 5V signal
appear?
No
No
Yes
4. Check the 5V Monitor
signal circuit.
Does the
5V Monitor signal
appear?
No
7. Check the VSC Vs-ON
signal
Does the
high tension output
appear?
Does the
VSC signal Vs-ON
appear?
No
No
Does the
high tension
output voltage
occur?
When
removing the Y B/D
Module input connector,
does output voltage
drop?
When the
Y, Z B/D Module
input connector, does Power
Board high tension
output voltage drop?
No
No
No
9. Check the Power
Board Output high
tension circuit
Yes
10. Check the Z B/D
Module output circuit
Yes
When
removing the Z B/D
Module input connector,
does output voltage
drop?
11. Check the Y B/D
Module output circuit
Yes
Yes
8. Check the Vs, Va
voltage output circuit.
Does the
Vs, Va voltage output
appear?
No
Yes
Yes
5. Check the VSC RL-ON
signal.
Does the
VSC signal RL-ON
appear?
No
6. Check the VSC low
pressure output
Does the
VSC low pressure
output appear?
No
- 18 -
1-2.Power Board Structure
T801: Vs Trans
T901: Va Trans
T902: Vs aux. Trans
L851: Vs Inductor
T112: Low Voltage Trans
T501: ST-BY Trans
T601: PFC Inductor
- 19 -
2. In case of strange screen display in specific modes
2-1. In case of no OSD display
(1) Symptom
1) LED is white.
2) The minute discharge is continuously accomplished from the module.
2) The minute discharge is continuously accomplished from the module.
(2) Follow check
Is the LVDS cable
normal ?
Is the VSC Board
normal?
Is the LVDS cable
connected?
Re-insert the Cable.
Yes
No
No
Yes
Does the FIL8532 IC
(IC800) Operate?
Replace the FIL8532 IC
(IC800).
No
Is the Ctrl Board of
Module normal?
Replace the Ctrl B/D.
No
No
Yes
Replace the VSC B/D
Replace the cable.
Yes
- 20 -
2-2. In case of there is no display on the screen in specific modes
(1) Symptom
1) There is no screen display from a specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input mode should become normality display.
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
normality display from the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of an unusual display in TV mode RF mode
(4) In case of an unusual display in TV mode AV mode
(5) In case of an unusual display in TV mode Component, RGB-DTV/ PC mode
(6) In case of an unusual display in TV mode HDMI mode
Is the Tuner normal?
Is the CXA2069Q
normal?(IC300)
Is the Tuner Cable
connected?
Re-insert the cable
Yes
No
No
Yes
Is the FIL8532(IC800)
normal?
Replace the Tuner.
No
Are the Input voltage, IIC Communication
and CVBS output normal?
Yes
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Is the CXA2069Q
normal?
Yes
Is the FIL8532
normal?
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Is the FIL8532
normal?
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Is the Sil9011
normal?
Yes
Is the FIL8532
normal?
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Are the Input voltage, IIC
Communication and HV sync
normal?
No
Replace the IC.
No
Click on the first or last page to see other 50PC1DA-EC (CHASSIS:PD61A) service manuals if exist.