LG - 42" PLASMA TV _ TROUBLESHOOTING - HINTS _ Contn:

Contn:                                                               [2]

Y-Sustain B/D

10A FUSE.

• Check FUSE [FS1(5v) ,FS2(Vs)].
•  Check voltages(Vsetup,-Vy, Vscw)
•  Check DIODE between GND and Y SUS output.  [SUSUP(OC2) SUSDN(OC1)].  forward=0.4 ,reverse=OVERLOAD.
•  Check whether output voltages agrees with voltage that represented in label.

NORMAL DIODE VALUE [FORWARD]:  [0.4]

NORMAL DIODE VALUE [ REVERSE ]:  [0L]

• Check whether output voltages agrees with voltage that represented in label.
• Check diode value GND between Y-SUS output.

Z-Sustain B/D

CHECK THE FUSE

CHECK INPUT VOLTAGES

• Check the FUSE.
•  Check input voltages.(Va, 5V,15V)
•  Check FPC out put diode value.
•  Check ramp waveform.

Variable resistance of Z Ramp.  

Check FPC output diode value. [Check certainly after removing FPC]

Normal diode value:  [0.375 forward]

Normal diode value =Overload Reverse]

POWER PROTECTION

• It is power protection when power is off automatically within 2~3 min. from power on.
• Power protection function protect the boards when occurred short on circuits of PDP module or power problem.
• If can not impress power even after replacing PSU, find out where the short occurred.

DAEGIL PSU

ORIGIN PSU