Tip & How-To about LG 50PG20 50 in. Plasma HDTV
The "TV shuts itself off" or "TV won't power on" problem in the Philips 42PFL5432D/37 HDTV is due to a faulty Power Supply Board, # 715T2432-2. To be more specific, bad electrolytic capacitors on the PSB cause failure problems. These caps most likely failed due to a lack of preservatives that protect the caps integrity.
First and foremost make sure your warranty is expired as this procedure will void it.
Perform At Your Own Risk:
It never hurts to take pictures for reference purposes.
1. Remove TV from stand or mounting device and place screen down
2. Remove back panel of your TV by removing screws from the perimeter, middle and side AV. Lift back of the TV off and locate the PSB (the board that the power cord plugs into) PSB #715T2432-2
3.Visually inspect individual capacitors (C951, C952, C953 rated at 1500uf at 35V and C955 rated at 2200uf at 16V) for bulging or leaking. Even if they show very little sign of or even no distortion they may still be faulty.
4. Disconnect wire harnesses. Remove screws holding in the PSB and remove it from your TV.
5. Loosen the glue holding C951, C952, C953, together. Gently pry them apart. They will kind of snap apart. C955 also has glue between it and a smaller cap next to it. Be careful.
6. Turn PSB solder side up. Use a soldering iron to remove caps. A small soldering iron works best as you will have more control. Heat the individual posts/leads of the caps one at a time, melting the solder. Use one hand to keep the soldering iron on the lead, as you reach your other hand under the board to wiggle the cap you are removing. You won't be able to remove the whole lead at once. Heat one lead; back it out, then the other and back it out. Using this walking action will help make sure you remove the caps without damaging other components.
7. Install the new caps by soldering them. Make sure that caps are installed with the correct polarity + to + and - to-. It is crucial. Both the caps, and the board is labeled. Thread the leads through the appropriate +or - terminal in the board. Get them as tight to the board as you can. Clip the obviously to long leads to about 1/8 in. Bend the leads down on the board to help secure the cap to the board. Solder the leads to the board by heating the lead first, and then add solder.
8. Reinstall the PSB and reassemble the TV. Remember to reconnect the wiring harnesses. It is best to test the TV with the back panel at the very least covering the TV. Caps can explode if you have installed them incorrectly or if there are other serious power problems that caused them to fail in the first place.
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