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Problem for LG RU-42PX10 42 in. HDTV-Ready Plasma Television

I have a plasma tv 42 in and I have a black

By roxane1955 on Nov 05, 2009

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I have a plasma tv 42 in and I have a black screen. What is wrong?

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Solution #1

posted on Nov 05, 2009

jan mczeal

Rank: Guru

Expert
Rating: 88%, 305 votes

Failure in either of the following can cause no video output.

Panel
Y Drive Board
Y SUS Board
X Drive Boards
Tape Carrier Package (TCP)
Main Board

Try these if you have electronics background :
Note: Touch your fingers repeatedly to a ground connection point or unpainted metal in the product before proceeding.

Unplug the unit.
Remove the back cover by removing the screws holding it. No need to remove the stand.
Disconnect the LVDS cable from the power supply or from the main board. LVDS cable runs from the right bottom of the power supply to the upper left of the main board. Power supply is located at the upper center of the unit and the main board is at the right bottom of the unit.
Plug the unit back and turn it on or the unit turns on automatically.
Look for the Control Board. It is located right at the center of the unit below the power supply. It has a LED on it.
On the Control Board at the right bottom of the MCM chip, the big chip right at the center of the board, you can see two test points. Short across the two test points.
If there appears a picture of cycling colors and patterns, the Y-SUS, Y-Drive, Z-SUS, Power Supply, X-Boards, TCPs and Panel are all OK. The Main Board or the LVDS cable is defective.
Check LVDS cable continuity.
Replace Main Board if LVDS cable is good.
If no picture of cycling colors appeared on step 6, some adjustment is off or some portion of the signal is missing.
Check fuses or continuity of voltage supply lines going to the X Board/s, Y SUS and Y drive Boards and Z SUS Board.
Replace blown fuses, connect broken lines, and resolder loose solders.
If no apparent damage is found, ask for a qualified or experienced technician's service. Massive and sophisticated tests and voltage readings are required and proper tools are needed such as oscilloscope to find which signal is missing. The parts to be tested are prone to handling damage and requires proper handling and testing.

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Solution #2

posted on Nov 05, 2009

leethedeuce

Rank: Guru
Rating: 86%, 525 votes

There are a lot of possibilities. If you could give a lot more detail that would be great. Also how long have you owned the tv? Does the tv turn on at all? is there audio? Does the onscreen menu come on? Once I have more information I can assist you further.
Thanks,
Lee

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