Question about Sony KV-36XBR450 36" TV

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I have a problem that appears to be related only to my coaxial cable input. I periodically get static, white lines across the screen or a "no signal" error message. Pixilation does not occur. Initially it occurred after the TV had been on for a few hours, but now it occurs nearly all of the time. This effects both visual/audio. The same problem occurs when attempting to use my VCR, which also enters the TV via the same coaxial cable input. I've tried bypassing the VCR completely, and changing the cable, but the issue still occurs. It is not the tube itself, as I still have a perfect picture when viewing DVDs via the component video inputs. Possibly indicative of the cause of the problem, when I use PIP, the issue only occurs with the primary picture. The secondary PIP (picture in picture) is perfect, and the problem does not occur. I suspect that the issue is occuring after the coaxial cable signal enters the TV, since the problem effects the primary picture, but does not effect the secondary PIP. Someone else posted a similar problem with his Sony TV and someone suggested a possible problem with a printed circuit pcb. Any suggestions on what may be causing this and whether it is a simple repair? Also of importance, the TV is too large and too heavy to put in my car to take it to a repair shop.

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Hi

I think your problem is in the tuner, a metal box located near the antenna input. This tuner can be removed and serviced. Sometimes the tuner DC supply line is unstable due to a filter capacitor or zener diode generally rated 33V (most common) and should be the first step in troubleshooting process.

Sully

Sully

Posted on Sep 28, 2013

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techman
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SOURCE: Sony KVTS27 audio noise and pops

your problem is a stand-up printed curcuit pcb it has several mof those small surface mounted caps that always goes bad and the # on the part is SBX1981or SBX1981-51p its part # is 874213400 its about 11 to 15 bucks . Dont try to repair the part as the pcb is eaten up from the caps leaking all over it. Good Luck

Posted on May 06, 2006

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Hi
I think the problem is in the tuner, a small metal box near the antenna input and can be removed and serviced. But first you should check the DC supply line to the tuner. The circuit has a big limiting resistor (15K/3W) and a 33V zener diode and a small filter electrolitic capacitor). The zener is prone to be leaky and unstable.
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