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Less Than 1 USD To Repair 42″ Plasma TV
It was an older model of Philips 42” plasma TV with the model of 42PF7320/98. The complaint was the power green light would automatically switched back to red light after you have pressed on the power button in the remote control. There was no display.
The first thing to do is to remove the tons of special screws (you need a 6 point star tip screw driver) that secured the back cover.
It took me a while to remove all the screws and the big metal cover.
Once the cover was removed I began to check on the boards to see if there is any loose connection, bulged e-caps, burnt mark and etc. Take a look at the photo below the number of circuit boards found inside the Plasma TV:
After scanning the boards for a moment I found there were two bulged e-caps located at the power board-see the photo below:
Before I remove the power board I took a photo of all the cable connectors so that I would not miss connecting it back once the power board is repaired.
The value of the 2 e-caps were 3300uf 10Volt 105 Celsius. Before I put in the replacement capacitor I cleaned the area first and tried to understand what circuit this dc supply line was going. After careful monitoring, the DC supply line is a 3.3 volt line (stated in the board) and the supply was going to the mainboard most probably to the MCU IC in the mainboard. This could be the reason why the power LED light will switched back to red once it turned green. The ripple from the DC line could have cause the mainboard to malfunction. With the replacement of only 2 e-caps (cost less than 1 USD) the Plasma TV was brought back to life again.
Conclusion- As mentioned many times before, repairing electronics equipment can be a very easy job or it can also be a very tough job to repair. You just have to take the set apart and scan for bad components. Don’t always assume it must be very tough to repair. Assuming if all the voltages are good and no bulged e-caps then you may have to use another approach to find the solution.
This article is brought to you by Jestine Yong
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By the way if you wish to learn more about Plasma TV or LCD/LED TV repair you can check out the ebook by Damon Morrow in the below link:
This ebook is not for beginners. It is written for intermediate and advanced repairers. One you have got the ebook you can always email him for support on Plasma/LCD/LED TV problems.