Riddled TV Repair Forum

shaolin29 · Joined: 09 Jul 2008 Posts: 9 Location: Orange County, CA

HELP a newbie out!

Panasonic CT-27SX31E approximately 8 years old.
My neighborhood had a black out last night with the TV on. Black out only lasted a minute. I turned the TV back on, everything was fine. 10 minutes later, another black out. This time around, no dice. Left it unplugged since, hoping it would reset or something, but to no avail.

Is my TV totally dead or is there possible solutions to remedy this?

Thank you to all in advance.

Google

Jesse Mack · Joined: 22 May 2008 Posts: 600 Location: The Last Frontier

After unplugging the set and removing the back, look on the small circuit board (the one with the power cord going to it.) There is a small glass GMA type of fuse (6.3 Amp) . If the fuse is all black inside it indicates that the fuse opened due to a hard short condition. if it is not black, but you can see that it is open (look through it while holding it to a light) just replace the fuse and your set will probably operate. If it is black, check the Diode's D801 ~ D804 front to back ratio with a multimeter set on Rx1 ohms scale. or in the diode position. if the diode measures extremely low resistance it is shorted and is the cause of the blown fuse.

let me know what you find.

Jesse

shaolin29 · Joined: 09 Jul 2008 Posts: 9 Location: Orange County, CA

Hi Jesse and company,

I opened the back of the TV and lo and behold, the fuse just as you said was black. I went ahead and bought another fuse, put it in, and closed it all up. I plugged the TV in and no dice. Blank screen, no noise whatsoever, no blinking lights.

Any other suggestions?

Again thanks in advance.

shaolin29 · Joined: 09 Jul 2008 Posts: 9 Location: Orange County, CA

Forgot to mention, I did go ahead and checked Diodes D801 - D804. All read approximately 300 k ohms.

Thanks.

kuhurdler · Joined: 28 Dec 2006 Posts: 2580 Location: Overland Park, KS

check them with the diode setting on your multimeter

Google

Jesse Mack · Joined: 22 May 2008 Posts: 600 Location: The Last Frontier

Also check the resistance directly across the power cord with a new fuse installed. This set may have a MOV installed (Metal Oxide Varistor) they are usually green of black and look like a capacitor. If you read O ohms across the AC line this component will be shorted due to the line surge. If you do not read short check the HOT (Horizontal Output Transistor) as these tend to short with a power surge.

Let me know what you find if you need more help.

Jesse

shaolin29 · Joined: 09 Jul 2008 Posts: 9 Location: Orange County, CA

I am a total newbie to fixing electronics, let alone TV repair so please forgive me in my cluelessness.

I did go ahead and set my multimeter to the diode setting and rechecked Diodes D801 - D804. Each diode read 0.570 V.

Again being the newbie i am, I was not quite sure what you meant by cheking the resistance across the power cord. But I did do what I think only made sense, I put the multimeter in the ohms position put one of the tips to one of the prongs of the cable outlet and the other tip to the board. Doing so, gave me a reading of 0.8 ohms on both sides.

As far as the HOT, I have no clue whatsoever what it looks like. So I couldnt check that.

Again thank you very much in advance and your patience. I know dealing with newbies such as myself can get bothersome. Thanks.

Jesse Mack · Joined: 22 May 2008 Posts: 600 Location: The Last Frontier

Well, lets try again, OK

I meant to say to check the resistance across the power cord. (This is the cord that plugs into the wall outlet (recepticle). (gives power (electricity)) to the set. I do not mean the antenna cable that supplies the signal (picture) to the set.

Think, Plug in the tv set cord.

Now, if you look at the end of the cord, one of the blades will be wider than the other. Put the meter between the blades. You should read infinity.

Let me know what you find out.

Jesse

kuhurdler · Joined: 28 Dec 2006 Posts: 2580 Location: Overland Park, KS

just some clarification: Don't test the resistance with it actually plugged in.

shaolin29 · Joined: 09 Jul 2008 Posts: 9 Location: Orange County, CA

I checked the resistance across the power cord as you suggested, the way you suggested. My multimeter slowly incremented until it showed OL, overload. So I'm assuming it is, infinity as you thought.

kuhurdler: I may be clueless when it comes to TV repair or simple electronics, but I'm not stupid.