LG / GOLDSTAR MF-056B CHASSIS
Service Manual

4. No Raster
(1) Symptom
Does�t minute discharge at module. ¯ It maintains the condition where the front LED is 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, P1100 normal operation: Replace the 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 the Left X-B/D No Is the Fuse(FS1, FS2) normal on Z-B/D? (In case of open is replace) Yes Is normal the output voltage after remove P1 connector of Z-B/D? Yes Replace Z-Board. No Is the Fuse(FS2) normal on Y-B/D? (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 the Power Board.

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