In the middle of watching a program the picture transfers out to the blank video screen. It continues to do this at all times. Have unplugged the TV to clear the problem and it still exists. Any suggestions. Thanks.
I may not have explained my problem as clear as I should have so here it is again: "Sony Trinitron TV just switches and goes through the video screens (video 1, video 2, video 3) - as though someone is hitting the "TV/Video" button, but it is doing it on it's own. It is doing it continuously and sometimes it just gets stuck on one screen and I can't change it with the remote or with the button on the TV itself". Thanks for any help.
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blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks
for about 30 seconds then goes to the self-diagnosis function. Something is
wrong with the video. Check video out, Q705, 732, 761 and other components on
the C board, also check Q218, 219, 220 on the A board. In addition, unit could
be in IK blanking, try turning up screen slightly.
Sony incorporates a video blanking circuit that blanks the picture out when the picture tube begins to get weak. sorry, but short of replacing the tube, there's no lasting solution to this problem. I used to have some success rejuvenating the crt, but I found that it didn't last but a few hours before the blanking circuit starts to activate again.
This could be a scan amplifier failure, and there is a loss of high voltage to the CRT. Part of the power supply may have also failed. In these sets, if the CRT emission goes low in emission, or the CRT goes defective, the bias supply to the CRT will go in to protect.
An experienced TV service tech can troubleshoot the set and give you an estimate for service. Considering the age of the set, the cost of service may not be worth it.
When you write 'blank,' is there any trace of light from the screen or is it totally black?
If it is black, then you likely have no high voltage and the fault would lie in the horizontal sweep section where the HV for the CRT is produced among others. This can vary a lot in cost of repair since it can require the replacement of a fairly expensive transistor and the HV transformer called a flyback; the latter may not be readily available.
If it still has some dim, gray illumination, the HV section is still working but the video and audio paths are interrupted.
If you have other devices such as a VCR/DVD player attached, these can interrupt the signal if they are installed in a conventional manner.
If you do, make the most direct connection possible by connecting your cable box/outlet or satellite receiver directly to the TV's input without looping through the other devices.
What you can also do (without giving you too much hope) is disconnect and reconnect all of the cables going to the set in the back.
Sometimes a coaxial cable will just stop contacting and removing and reconnecting them wipes the contact surfaces.