LG / GOLDSTAR 42PX4RV
Manual de Servicio

3. Protect Mode
(1) Symptom
After once shining, it does not discharge minutely from module ¯ The Rely falls(The sound is audible �click�) ¯ It is converted with the color where the front LED is red from green.
¯

(2) Check following
Is the Power Board normal ? Yes Is the each connector normal? Yes Is the Y-Board normal? Yes Is the Z-Board normal? Yes Is the X- Board normal? Yes Is the Ctrl Board normal? Yes Is the VSC Board normal? Yes Is the COF of X, Y, Z normal ? No After crisis COF of each board, check the normality operates. If in case normality operates, correspondence COF Fail is replace the module. No Is the output voltage normal after remove P1001, P1100? Yes After remove P1001, 1100 normal operation: Replace VSC Board No Is the output voltage normal after remove P1, 2, 4, 9, 10 connector of Ctrl-B/D? Yes Replace X-Board. No Is the output voltage normal after remove P1, 2, 3, 4, 5 connector of X-B/D? Yes After remove P1, P2, P3 output voltage normality: Replace Right X-B/D After remove P4, P5 output voltage normality: Replace Left X-B/D No Is the Fuse (FS1, FS2) on Z-B/D normal? (In case of open is replace) Yes Is the output voltage normal after remove P1 connector of ZB/D? Yes Replace Z-Board. No Is the Fuse(FS2) on Y-B/D normal? (In case of open is replace) Yes Is the output voltage normal after remove P5, P6 connector of Y-B/D? Yes Replace Y-Board. No After connecting well each connector, the normality it operates? No Replace the connector. No Is output the normality Low/High voltage except Stand-by 5V? No Replace Power Board.

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