Question about Toshiba 55H70 55" Rear Projection Television
I unplugged the TV power supply cord and reconnected it after a little while the light still kept blinking couldn't get it to come on. After setting up a small TV which works fine with the satellite connection, the next morning turned the big Toshiba back on to see if it would come on and play, it did for couple of daysday then went black again with the blinking light have done that twice now by leaving it sit overnight and again it worked fine. it is working now againthis but don't know for how long before blinks again.
No picture power light blinks
I am assuming the problem may be heat related, since the set works after cooling and being unplugged for a period of time. If this is something you are going to work on, I will suggest a pattern that we use at our shop to troubleshoot these type of problems.
, Can of freeze spray ( component cooler ) can be purchased at Radio Shack of any electronic supply store. Hair Dryer, Phillips Screw Driver or screw gun, soldering iron, solder.
1) Unplug the set from the wall/power
2) remove the back of the set ( bottom panel cover)
3) plug the set back in the wall and power up the ( turn it on )
4) with a hair dryer ( and not touching part of the inside of the set) turn the hair dryer on and blow hot air inside the set for at least 20 minutes or until the set quits
5)If set shuts down ( quits), then use the freeze spray to cool the boards by spraying. Do one board at a time to isolate the board. After cooling one board, try turning the set back on, if the TV starts, you have isolated the problem board. If not spray a second board and repeat the prosses for all board until the set starts so you can isolate the board.
6) Once you have isolated the proper problem board, you'll need to isolte the bad part ( ic, transistor, capacitor, etc). Again using the hair dryer, heat the board until the set shuts off. Then using your freeze spray, spay a small part of the board and see if the set starts working properly by switching the set on. With some time, you'll isole the problem part and the it's time to remove the bad part and simply change it. Remember to always unplug the set from the wall before touching anything inside or changing parts.
Additional Suggestions and PreCautions:
Your problem is most likely a filter Capacitor, moreso than a IC or Transistor.
Rember to use extreame caution when working inside the tv and please know that Freeze Spray freezes everything it comes in contact with including fingers, eyeballs and any skin part.
Posted on Jan 06, 2008
The blinking is giving you an error. Even thou you say your TV is working fine, there is something wrong. It could be anything from the convergence(like Color problems slightly out of line) or Sound problems, or you may have problems just in the power supply. Could you remember the set acting funny like in the past? If so do you remember what went wrong or what gliched? This could tell you what is going on now. If none of this it could be a capacitor in the Power supply.
Posted on Jan 06, 2008
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Posted on Jan 02, 2017
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