Question about Toshiba CF36G55 36" TV

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Picture just started to fade to B\W fuzzy then back to good color

This TV was purchased new in 1998 and has never given me any problems at all. I would like to repir because when it is working properly the picture is still outstanding. Yesterday, 10/14/08, the screen was distorted and B\W picture with color noise in the picture. I removed the coax from the back and plugged back on and picture was great. This lasted about 1 hour or so then went back to B\W fuzzy picture, and audio is always great. Is this possibly a cold solder joint and how would I trace the bad solder joint? I can tap on the side of the cabinet and it will straighten up for minutes now today and then back to distorted. It is getting worse today. I am pretty good with a soldering iron and have soldered a lot of electronic components in the past. I just need to know where to look precisely for the problem. Thank you for any help. Will B.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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techman
  • 3130 Answers

SOURCE: toshiba 36afx61 tv

You have a cold solder connection on the vertical output IC or in the sweep power supply that feeds the voltages to the vertical output IC. You can download a service manual from here: http://www.servicemanuals.net/results.aspx?type=SM&brand=0&model=36AFX61 Good Luck

Posted on Apr 27, 2007

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MikeNJ1964
  • 398 Answers

SOURCE: No picture, but red light on front comes on

If one your convergence IC's is bad then you will still see a picture but the colors will not line up, especially around the edges. I have never seen a Toshiba projection set completely lose the picture because of a defective convergence IC. If your vertical output IC has failed or cracked loose then that is exactly what you will see - no picture! The vertical output IC is usually on the same board as the convergence outputs which explains why it worked last time, even if the tech was not 100 percent accurate in knowing exactly what was wrong - he just changed everything. Resolder that vertical output IC and make sure it is getting power. If you still have no picture after that then have a qualified tech look at the set.

Posted on Jul 13, 2007

  • 1 Answer

SOURCE: Toshiba 35

turn the tv off ,disconnect from power source , then you can
wait 1 hour appx. ,for the crt to discharge it self ,or you can
being very  carefull discharge the crt by inserting a long
screw driver under the ground strap that runs across the crt
(thats the metallic one ) the other screw driver under the anode
high voltage cap (thats the one that connects to the top center
of the crt) then short the two screw drivers together ,you should
see a little spark if there was any voltage there ,after that you
can solder  all the cold solder joints.
May I suggest that you check the main chassis also for cold solder joints.
I have checked many a TV.,and I always check the main chassis  to prevent callbacks.
BE SURE  NOT TO CREATE SHORTS WHEN YOU SOLDER
USE A 40 WATT SOLDERING PENSIL/IRON
TAKE YOUR TIME. YOU SHOULD HAVE NO PROBLEM.

Posted on Oct 23, 2007

  • 1153 Answers

SOURCE: Distorted Picture Upon Startup

You have a bad capacitor in your power supply.

Posted on Dec 23, 2007

  • 188 Answers

SOURCE: Faulty DC power connector

First pulling a machine apart takes time and careful disassembly - it is easy to snap off fragile plastic panels or rip cables and replacement parts can easily cost as much as paying someone to disassemble it for you. Usually a jack repair is $100-$150 depending on the shop.

Toshiba's are a multilayered setup - You have to remove all the screws from the bottom (note that they are labeled by screw length next to each hole - do NOT put the wrong length in when reassembling!!) Make sure to remove the hard drive and ram cover and check for screws there are well.

After all the screws are out of the bottom, remove the panel above the keyboard. Remove the keyboard and all the screws under the keyboard. Then you can get at the motherboard and power jack.

You will probably have to remove the motherboard to replace the jack - Usually the mounting screws for the motherboard are not so clearly labeled - i mark the holes with a sharpie when pulling a mainboard.

Good luck!

Posted on Dec 28, 2007

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