Question about Philips 27PT543S 27" TV
My Philips 27PT543S37A won't turn on. When I plug it in, it makes a high pitched bird chirping sound. When I took off the back case of the TV, the sound appeared to be coming from the transformer. If it is not coming from the transformer, I know for sure the sound is coming from the green circuit board with the transformer on it.The noise slows down and stops when the TV is unplugged, and pushing the power button when the TV is plugged in does nothing. What's wrong? Can I fix this?
Phillips TV, 27”, model:27PT543S37A REPAIR…
Clicks and turns off after turning on set when cold. Have to turn on and off several times to work, or keep changing channels, right side of screen is black for a while.
PROMLEM: It is almost always a bad transistor and a bad capacitor. (about $0.70 in parts)
This repair is fairly straightforward. You will need a soldering iron, a solder ******, and a small torx bit. Unplug the set. Lay the TV on the floor, screen down. Remove the torx screws holding the rear cover on. There should be 10, (don’t forget the 2 by the input panel). You will see 2 circuit boards, the one of interest is the large one near the bottom of the set. This board has a retainer clip on each side that needs to be pulled out to allow the circuit board to slide out. Slide the board out about 5-6 inches. You might need to support the board so it doesn’t slide back down into the TV set. This circuit board should have numbers by each of the components. You want to look for 7461 (transistor) and 2455 (capacitor). They are located right next to each other near the center of the board. The transistor will usually overheat and discolor the circuit board immediately around it. Warm up the soldering iron and get the solder ****** ready. Heat up the solder joint while removing excess solder with the ******. Once the transistor and capacitor are free, check the numbers on each. The capacitor (round cylinder) should have “47uf” on it. The transistor should have “C33725” on it. You can order these parts from Digi-Key (google it) for about $2.50 including shipping if you use USPS option. The part numbers are: 493-1060-ND for the capacitor and BC33725-ND for the transistor. Once you get your parts, solder them in and check TV operation. It should work as it did before. (Wouldn’t it be nice if these companies could focus on quality rather than saving $0.04 here and there??!!??). This repair can be done by anyone familiar with a soldering iron in about 30-45 minutes their first time. Good Luck!!
Posted on Oct 09, 2008
The "singing" you hear is an overloaded Power supply and that could be a shorted Horz. output xsistor as well as a bad Flyback xformer.. Its a posiblity that you could even have an open B+ cap off the flyback that supplys a voltage to the scan drives but most likly the earler.
Posted on Mar 22, 2006
Shorted diode R2KY on b+ or shorted h.out.
Posted on Oct 10, 2007
I don't have a solution for you unfortunately, but I have the same problem! Did you figure out what was wrong? I own an RCA tv that is only about 3 years old. The SAME EXACT thing is happening to my tv. I don't know if it's worth it for me to bring it to a tv repair man.
Posted on Nov 06, 2006
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Posted on Jan 02, 2017
Its a real good chance that the HOT (horizontal output tranistor) transistor is shorted if so the flyback trasformer may be bad also. the transformer will make a tick tick sound if it is trying to start.
Posted on Apr 10, 2009
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