Re: Philips 42PFL3704D/F7 No pic,No Backlight, w/Audio

Ordered new inverter board for $50. TV works great. Thanks everyone.

Re: Philips 42PFL3704D/F7 No pic,No Backlight, w/Audio

Unfortunately I did the opposite. I used my 60 watt iron thinking I could bend the transistor up and then remove each leg but that caused a few of the legs to come off. Great tip. I'll have to use that method next time.

Re: Philips 42PFL3704D/F7 No pic,No Backlight, w/Audio

Thanks BUDM. You must have been replying at the same time I was. You're absolutely correct. The two transistors I pointed out seem to have been the problem but unable to check do to the legs coming off. I was very careful but with the entire bottom of the transistor attached to the board with solder it was difficult to get off cleanly. I guess I'm just not patient enough.

Re: Philips 42PFL3704D/F7 No pic,No Backlight, w/Audio

Thanks for the quick response. I did more checking and secondary side has 0 ohms. All transformers checked out fine.Narrowed it down to the two P2204nd5g shown in pic below. After removing which wasn't easy, the short subsided. Though taking these 2 transistors off, the few legs fell off damaging them. I see they're only available from china. I imagine this is common for the transistors to short but with the few legs that fell off when unsoldering, I was unable to test the transistors. Maybe better off ordering new board instead...

When tv is plugged in, screen comes on with Philips logo and then screen turns off but front "on light" stays illuminated. I have 24 volts at inverter. Did test on inverter board and found that one of the two 8a/160 volt fuse which I believe is open because when conducting a test, 24 volts only reads on one side. I've enclosed a pic of the location of the fuse. When I jump the apparent blown fuse, plug the tv back in, tv clicks on but now no screen flash and then tv shuts off. When performing this test with volt meter, it seems to shut down all of the 24 volt power. When I leave the...

Re: Philips 42PFL3704D/F7 No pic/No Backlight, w/Audio

I have the exact same problem though my screen first comes on then goes off after a second or two. Did test on inverter board and found that one of the two 8a/160 volt fuse is open. I have 24 volts measured at both white fuses but one doesn't read 24 volts on other end. When I close the blown fuse with an alligator clip, it shuts down the 24 volts completely as their seems to be a short. Does this tell me that the inverter board has a short? I checked the 4 caps on that side of the fuse and they're fine. Is it possible that...

Re: Panasonic TLX-04244B

The problem I found with this LCD tv is they installed CCFL lamps without soldering them. They just snap in and over time they start to arch. That's the buzzing sound you are hearing. The arching causes the inverter to shut down. I took the time to disassemble mine and carefully lifted each bulb out of their sockets and cleaned them. There are 18 bulbs in all. Be careful because these bulbs are extremely fragile. TV is back on and working.

Re: Polaroid TLX-04244B Backlight turn on and says Polaroid then backlight goes off

The problem I found with this LCD tv is they installed CCFL lamps without soldering them. They just snap in and over time they start to arch. That's the buzzing sound you are hearing. The arching causes the inverter to shut down. I took the time to disassemble mine and carefully lifted each bulb out of their sockets and cleaned them. There are 18 bulbs in all. Be careful because these bulbs are extremely fragile. TV is back on and working.

Re: Polaroid TLX-04244B

What I found out with my LCD tv if the any of the ccfl lights goes out, the inverter board shuts down within a few seconds of starting. This was the case with my TV. One bulb was out causing this issue. It is a project to tear apart though. As you can see from the pic, there are 18 bulbs and one in the middle is out. You can also tell by the darkness of the LCD bulb....