Question about Toshiba CF27F50 TV

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Crackling and lines for about 5 minutes then is fine

When I first turn it on I get a loud cracling thar doesn't change with volume control. Some lines across the screen. It comes on fone after about 5 minutes. Now before that I get snow before the crackling but again it's fine after about 5 minutes. It's not a cable issue. I have unplugged it for a minute or two to try to reset. That did nothing.

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Re: crackling and lines for about 5 minutes then is fine

Could be a bad solder connection at or near the flyback area. The flyback delivers high voltage to the tube.

Posted on Apr 07, 2007

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if the tv width is ok try entering to service menu (do not use remote control) as follow:
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4) The screen will display a one line menu, on the left the parameter P00,
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It may not need repair or replacement.
Unplug the set at least overnight; the CRT (picture tube) has voltages that may be as high as 30,000 volts and take time to bleed off. Believe me, it stings if it bites you.
Remove the rear housing of the set, then use a clean (preferably new) 2-3" paint brush to whisk away any dust deposits you see. This works best with the nozzle of your vacuum cleaner near the area you are cleaning.
The problem you describe can be caused by an accumulation of dust that is picking up moisture from the air and temporarily creating a path for high voltage to discharge which can cause all kinds of strange occurances such as you describe. The warmup of the set dries out this moisture removing the discharge path.    If you don't remove this dust buildup, it will eventually damage the high voltage circuit if not others as well. That high voltage is a healthy static charge and wasn't designed to supply a lot of current which it has to do when discharging.

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I had the same problem with the volume in digital mode and found the answer here:

The actual solution is towards the bottom of the post and hard to read through, so I simplified the instructions below:

On your remote control (with tv off)
1. press Display, channel 5, Volume Up and then Power
this brings up the service mode (you will see some green text on your screen)
2. Press channel 2 to scroll through options until you see "Micro" in the upper left of your screen
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3. Press channel 1 to scroll through suboptions until you see "DIOF" appear under "Micro"
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4. Press channel six until the default value (12:60) changes to 12:40
(channel 3 increases the value, channel 6 decreases the value)
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This model is equipped with a keyboard lock feature. To unlock the keyboard press and hold the "menu" button on the front panel for 10 seconds. If this doesn't help you have to make some checks in set. First IC7D04 (temperature related) may cause lines in pic. Check 9v DC on terminal PCB at Connector JA pins 57&58 if missing then change IC9C25 part#270p677030 on signal PCB.

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