My Sony CDE E540 flickers several times during bootup and retrace lines can be seen on the screen. If I set the brightness and contrast to 40 and 40 the screen is gray. right noe the contrast is at 85 and the brightness is at 12, Need help
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if retrace lines at top of picture the issue is in the vertical circuit--usually a bad filter cap and or the output chip (most of the caps that cause that are 220 uf or 330 uf and connected directly to one pin on the chip.
If retrace lines are across entire screen---likely the master screen control on the Flyback is set too high--causes excessive brightness and the retrace lines.
If the lines are slanted up from left to right and spaced several inches apart, you are seeing the vertical retrace line. In that case, you may want to turn down the screen voltage on the green CRT. The instructions for making this adjustment are given in the service manual. It should take just a small tweak to hide the retrace line. If adjusting the screen voltage won't do the job, check for a leaky or improperly biased CRT driver transistor, then compare the video waveforms with one of the other CRTs to make sure the voltage at the vertical blanking interval is correct.
In the worst case, there is a problem with the CRT. This is generally accompanied by occasional arcing (bright green flash or the set shuts down with an error code flashing on the power light).
check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.----
a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.----
with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT.
excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen.
check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines.
for getting any required parts to replace you can get it from
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1. Turn the green
screen control on the Focus Block until retrace lines appear and gradually turn
it back Until the point where
you can see the retrace line disappears, just before cutoff. 2. Turn the red screen
control on the Focus Block until retrace lines appear and gradually turn it
back Until the point where
you can see the retrace line disappears, just before cutoff. 3. Turn the blue
screen control on the Focus Block until retrace lines appear and gradually turn
it back until the point where
you can see the retrace line disappears, just before cutoff. 4. If the
screen still appears too bright after proper G-2 adjustment, you need to adjust
the sub-bright adjustment in the service menu control down
until screen cut-off. (Service data Range is usually 21 to 25 in the Service menu, for Sony
sets you first go to category "MCP2", & then adjustment item 01(
"SBRT")= subright. For electrical the focus, put on the screen a
clear picture of your choice thru an input of the TV set from a DVD, then pause
the playback of the DVD Look into each color and rock that color focus control
back and forth (turn the control one way then the other way slowing down as the
picture goes into the best focus. till the picture looks sharp do each color
till they all look in focus. NOTE: it is best to look into each color
tube to achieve the best electrical focus.For optical focus please follow the manual lens adjustment in the sets
service manual By Larry
Answer ONE: Yes, the speaker mounted close/near to the set
can be a cause of mischief; please move it further away and see if that
helps clear up the problem. But, you must keep it away for several
days before you will know for sure because it takes some time to
degauss all the internal parts that may have become corrupted by the
magnets in the speaker.
TWO: Yes, any set can be repaired the question is cost and wisdom.
Old sets are sometimes not worthy of the repair simply because of the
likelyhood that another failure will follow soon after. A big screen
always invokes a repair charge of $200 and up. After a few of these you
will wish you had put all the money into a new set!
THREE: The lines are most likely a problem in the vertical blanking
circuits of the set. These are horizontal retrace lines that are
supposed to be blanked out during vertical retrace of the raster.
Think of it as a paintbrush that scans across the screen painting thin
lines and when you get to the bottom of the screen it goes quickly back
to the top, but during that time the horizontal, which is many times
faster, has made several sweeps; so it must be blanked out during the
retrace. The repair involves finding the guilty parts and replacing
them. Usually this repair runs over the $200 somewhat.
FOUR: Prior to calling in a service tech try a hard reset to see if
that will recover any of the circuit degradations. Merely unplug the
power cord and leave unplugged for 4 hours or more. It may help. Or,
it may not help; but worth a try since is won't cost you anything.
If the set is over 5 or 6 years of age it probably is not a condidate
for any expensive repair. On the other hand, it is a Toshiba - and
they make a fine set.
Hope this helps. Let me know if you have further thoughts.
Try this: On the flyback transformer, raise the SCREEN voltage. There are 2 controld on the flyback - the top one is FOCUS and the bottom one is SCREEN. As the tube ages its emission decreases, and the computer monitors the tube's emission. When the emission gets to be too low, the computer shuts the set down. This is exactly like IK blanking in Sony sets, except Sony blanks the video and Philips shuts the set off. To set the screen voltage properly, turn the brightness and contrast to 0, raise the screen voltage until you see the white retrace lines in the picture, and then back down on the screen voltage until just past the point where the retrace lines are gone. Reset your brightness and contrast and the set should play fine.
A "Gray Scale" adjustment may solve you problem.
If one of the picture tubes is set too high it will cause these RETRACE lines.
Then too a weak picture tube might cause this.
If the horizontal lines are one color: red, green,or blue then whichever color that is shown would tell you which tube is set too high.
Your set has 3 screen controls that control the brightness of each tube. One may need to be turned down a little.
Those lines sound like "retrace lines" and several things can cause them. The most common are shorts inside the picture tube and shorted semiconductors in the video driver circuits. They can also be seen if the blue screen voltage is too high or if someone has tampered with the screen voltage control.