very informative article:my problem is understanding,how do you ,test ic resistor,diodes and everything else on a board :where everything is connected in one way or another.how can you seperate ,each individually ,without taking it apart.
Troubleshooting a TV For a Dead Condition (Page 2 of 2)
Categories: Televisions and Projectors
The Main Power Supply
The next step in troubleshooting would be to check the main power supply. First, check the bridge rectifiers. A bridge rectifier could be a combination of four silicon diodes or a square rectangle type package. Use the diode function on your multimeter and see if there’s a short across one of them, or perhaps between the pins of the rectifier block. If there’s no short there, measure across the main B+ filter capacitor, but make sure you discharge it as described earlier! If there’s a dead short there, take out the cap or disconnect one end to see if it’s shorted. If not, reinstall or resolder, then measure the transistors and diodes around the power supply area. If you don’t find a short with one of those components, go to the horizontal/sweep power supply circuit.
The Horizontal Output Transistor & Flyback
First, locate the horizontal output transistor. This is found very close to, or next to, the horizontal output transformer (also known as the flyback). The flyback should be on an aluminum heat sink, or on the side of the metal chassis. Disconnect or unsolder two of the three legs of the transistor. Measure it with your meter, or plug in the set with the light bulb attached across the fuse.
If the transistor is shorted, or the light bulb doesn’t glow bright anymore, replace the transistor and plug back in. If the light bulb glows bright again, you must replace both the flyback and horizontal output transistor simultaneously. In some cases this will fix the set, but sometimes there are multiple problems with a set.
Go to where the flyback is, and start measuring the diodes and capacitors on the flyback itself. If you don't find any shorts there, it could be a shorted vertical output IC, a shorted sound IC, a shorted disc capacitor in the Hi Voltage/sweep circuit, or in rare cases, a shorted capacitor or tuner.
You will find the short in the board if you're persistent. Just remember, do not replace the fuse if the bulb stayed bright, as this could cause additional damage to the set. I have experienced a few occasions where lighting has hit a cable or electric line outside, and damaged every IC in the set.
The fixes described here are general, common problems that occur when a television set goes dead. Remember that working inside of a television should never be taken lightly, and that safety should always come first.
by Larry Dillon
Image and editing by Matt Whitlock
I have a phillips television, it comes on but cut off almost instantly, you can turn it back on but is stays on for a second then cuts off again and keeps on doing that what can be the problem?
Had a hard time trying figure out your email, hopefully you get this and respond. I have the Mitsubishi Death Blink issue going on with my model WD-52525 and was hoping you could give the part #'s for the capacitors I need to fix this problem, along with the procedures. My email is firstname.lastname@example.org.
Larry Dillon said: thre are part numbers I posted at the end of the e-mail http://www.mouser.com/search/refine.aspx?Ntt=140-HTRL16V1000-RC%09 And http://www.mouser.com/Search/ProductDetail.aspx?qs=N98n18CgKlweB%252bCgTM8ZbQ...
Thanks for the info on the parts. Do have the procedures for removal of the card cage?
Scrumpy did you ever get the procedure for locating and removing the Hi-Temp Radial Electrolytic Capacitors.
Larry Dillon said: thre are part numbers I posted at the end of the e-mail http://www.mouser.com/search/refine.aspx?Ntt=140-HTRL16V1000-RC%09 And http://www.mouser.com/Search/ProductDetail.aspx?qs=N98n18CgKlweB%252bCgTM8ZbQ...Larry, where and what is the procedure for changing the Hi-Temp Radial Electrolytic Capacitors.
Larry that was a very helpful article Thanks will help to keep my fingers from getting burned Bob
Glad I found your article. My electronics friend left for Puerto Rico to marry and I am on my own. Until I can find someonw who can do electronic, I will read about the repairs and if I come across something I can do, I will. Thanks for the information, but I believe I will just replace the set as the repairs are too expensive.
You would be my SAVIOR if you replied to this. Our 2,000 dollar television went Caput!! It's the WS65513 Mitsubishi 65" 5 year old (2004) tv and apparently the capacitors in the DM board failed..the green light is now blinking and the tv wont turn on. I read a reply you had to someone else about this issue, but im a new member to techlore so i didnt know how else to reach you. If you could out of the kindness of your heart, email me at email@example.com and send me the instructions of what to do to solder this, because my job involves soldering so I know I could fix this problem. Thank you!!!
I have a problem, my tv is just a regular tube tv about 20 ish inches or so, but I go to turn it on it turns on stays on for a few seconds then shortly turns off right after.
Can you help me please. I have a Mistubishi WS-55909 MANUFACTURED JUNE 2002 and is in completly dead condition, would you please send me instructions how troubleshooting this in particular one? some body told me could be the power supply..
what could be the trouble of the tv when it is first turn on it will shut down immediately
I need help - can someone email me service manual for Sony KV-1415AS 14" color TV. The set is dead and I would like to see if I can fix it.
Larry, I am very new to the site but I know I am going to enjoy your contributions.
Any help given will be highly appreciated. My email addy is firstname.lastname@example.org
Hello MY TV SHARP LCD C3242U STOPPED WORKING AFTER SEVER WINTER WEATHER
Please advise what you will recommend me to check by myself at home fuse replace/ etc.