Diagnose the Problem
The first step in diagnosis is to check the display for any cracks on the screen. If the screen appears cracked, then the repairs may require plasma screen replacement
. A cracked screen means that the gases inside have probably escaped. There is no way to refill the gases and the whole display will have to be changed. In this case, an authorized service may be able to provide more details. If the problem persists, then a gas leak is perhaps not the cause of a loss in display. Lamp burnout could be one reason behind a blank screen.
Check the Fuse
Most of the time, the plasma TV fuse
is at fault for no picture on an LG Plasma screen. In such a case, changing the fuse should make an LG Plasma TV functional.
- Unplug the TV and wait for 10 minutes for the capacitors to discharge.
- Take a Digital Multimeter and set it to the 0-200 ohm range.
- Touch the red and black probes to each other and check the readings. The multimeter reading should be in the range of 0-2 ohms.
- Now touch the red and black probes to each end of the fuse. If the multi-meter reads '1' or 'OL', then the fuse has blown and needs replacement. If the multi-meter shows the same reading as before, the problem lies elsewhere. Some cases may require the motherboard to be completely replaced.
Fix the Problem
If an LG plasma TV
has no picture and no sound, then either the Y-sustain or the Z-sustain are at fault. Follow these steps to determine and fix the problem.
- Unplug the TV and wait for 10 minutes for all the capacitors to discharge. Then open the back panel of the TV.
- Unplug the Z-sustain from the TV and plug the TV into the power supply. If there is sound, then the Z-sustain is faulty and will need changing.
- If there is no sound, follow the same procedure and unplug the Y-sustain. Check for sound. If there is a sound, then the Y-sustain is faulty.
- If the Y-sustain is faulty, a user may have to check the Y-buffer. He will have to follow the same procedure and unplug the Y-buffer this time. If there is some picture with sound, it means that the Y-buffer is faulty.
Keep in mind that a plasma TV runs on very high voltage. The voltage on some connectors exceeds 400V (in excess of 200 joules of energy). This high voltage can be very dangerous. That why it's important for users to always make sure the capacitors have discharged before performing any type of diagnosis or fixes on an LG Plasma or any other television set.