[3] SAMSUNG HLN-5065 [PTV]
The Lamp is normal, but a blank screen failure occurs >
- Check the signal supply procedure. Check whether the signals are supplied from the analog board to the digital board.
- Check in which mode the screen does not display.
- If the RF, VIDEO, DVD or DTV mode screen does not display, check the analog CN511 terminals, Digital CN309 connector connections, and their signaling
- The DVI or PC mode does not display, replace and inspect the digital board.
- If the screen does not display in any mode, check whether the signals are being output from the digital baord.
- Check the output of the IC314 terminal. If the signal output state is normal, suspect DMD board.
- Check whether +26V and -26V is being supplied to DMD board. If the voltage is normal, replace the 'tantal' condenser (C116, C110 when failure occurs intermittently.) If the problem continues after replacement, then replace the power drive IC [IC108].
- If the DMD voltage is normal, replace the panel, or reassemble the panel. [Try to fix the four silver screws again]
DMD state inspection Method >
- Remove the heat sink attached to DMD board.
- Fix the DMD by tightening the screw again.
- Check the signaling for each point.
- If the horizontal raster failure occurs;
- Check whether the output of the R NETWORK (RA101 TO RA104) terminals of DMD board are normal.
- If vertical line failure occurs;
- Check whether it occurs within the regular wide range. (Less than 26mm for 50" TV)
- If it appears at regular intervals of less than 26mm, check the DMD fixing state. Loosen the four silver screws, and then re-assemble them.
- If the vertical lines do not occur at regular intervals, or intervals are more than 26mm, or irregular, replace IC117 (DDP1010).
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