Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

[Dannyx]

Good day folks. A neighbour of mine asked me to take a look at her Sony TV, saying that it doesn't tune properly. So I went to her house and sure enough, the TV was "struggling" to tune the channels, meaning it displayed a distorted mess, similar to when the antenna conector is broken or improperly seated - that was my initial though, since the wiring job at her place is pretty messy, with botched connections and kinked wires running all over the show, so to eliminate this variable, I took the TV to our shop where I know the cable is good. This time I also ran a full channel scan to make sure that's not the issue, and sure enough it does "lock" onto the channels, but the picture quality is just....poor, more specifically, it has a double-image effect, making watching something virtually impossible, unless you're standing like 6 meters away from the thing. It's not a problem with the LVDS cable or panel, because the OSD menus and other sources display properly - it's only the cable source that does this, so there must be something wrong with the tuner.
I took the back off and inspecting the area around the tuner, something caught my eye: the cap in the pictures - is it supposed to protrude out of its jacket at the top like that ? I've seen cases where caps did that, despite not being bulged. There's one more cap like that closer to the tuner, you can just about see it in one of the pics. Could this be the cause of the bad signal quality, or should I try replacing the tuner box entirely ? I took some close-ups of the main board here and there. I also see an adjustment pot through a hole in the case of the tuner, how about giving that a turn and see what happens....afraid I'll knock it out of frequency or something and make it worse, that's why I haven't tried it yet

[dskall]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

Cap looks a little funny. I would pull it and check it. I think cover comes off tuner. Could have a look inside. Try adjusting just mark so you can adjust it back.

[keeney123]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

Good day folks. A neighbour of mine asked me to take a look at her Sony TV, saying that it doesn't tune properly. So I went to her house and sure enough, the TV was "struggling" to tune the channels, meaning it displayed a distorted mess, similar to when the antenna conector is broken or improperly seated - that was my initial though, since the wiring job at her place is pretty messy, with botched connections and kinked wires running all over the show, so to eliminate this variable, I took the TV to our shop where I know the cable is good. This time I also ran a full channel scan to make sure that's not the issue, and sure enough it does "lock" onto the channels, but the picture quality is just....poor, more specifically, it has a double-image effect, making watching something virtually impossible, unless you're standing like 6 meters away from the thing. It's not a problem with the LVDS cable or panel, because the OSD menus and other sources display properly - it's only the cable source that does this, so there must be something wrong with the tuner.
I took the back off and inspecting the area around the tuner, something caught my eye: the cap in the pictures - is it supposed to protrude out of its jacket at the top like that ? I've seen cases where caps did that, despite not being bulged. There's one more cap like that closer to the tuner, you can just about see it in one of the pics. Could this be the cause of the bad signal quality, or should I try replacing the tuner box entirely ? I took some close-ups of the main board here and there. I also see an adjustment pot through a hole in the case of the tuner, how about giving that a turn and see what happens....afraid I'll knock it out of frequency or something and make it worse, that's why I haven't tried it yet

I would try another input and see if it takes care of the double image.

[R_J]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

I know some of the Sony tuners in their crt tv's had bad solder on their ground connections inside the tuner module, also where the leads came inside the tuner could also have poor solder connections

[Dannyx]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

I would try another input and see if it takes care of the double image.

I assume you did not fully read my post: the issue only occurs on TV, all other sources are fine, so it's not a display issue.

[R_J]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

I have'nt seen any tuner problems in the newer sony lcd sets but theres always a first. I would replace that cap and maybe check others around it before going into the tuner module.

[Dannyx]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

I have'nt seen any tuner problems in the newer sony lcd sets but theres always a first. I would replace that cap and maybe check others around it before going into the tuner module.

I wouldn't quite call it "new"....it's not even digital, but whatever

[R_J]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

well I did'nt say it was new I said newer as in not a crt tv which had the tuner module problems. when I see caps next to coils like that I suspect they get quite warm and would be my first suspects.

[Dannyx]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

well I did'nt say it was new I said newer as in not a crt tv which had the tuner module problems. when I see caps next to coils like that I suspect they get quite warm and would be my first suspects.

I returned the TV anyway, so it's too late now...thanks anyway.

[keeney123]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

I assume you did not fully read my post: the issue only occurs on TV, all other sources are fine, so it's not a display issue.

I read it but was a little confused as to what sources were, I call them inputs. Most likely it was in the Phase Lock Loop section of the tuner.

[CapLeaker]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

Too late now I guess, but I would have ran the TV for a little while to see if those suspected caps got hot. And of course I'd have checked the caps with the oscilloscope.

[Dannyx]

Re: Sony KLV-37s310A bad quality cable signal (possibly bad tuner/caps)

Too late now I guess, but I would have ran the TV for a little while to see if those suspected caps got hot. And of course I'd have checked the caps with the oscilloscope.

Technically, I COULD get back the TV to work on it so more, since it belongs to someone who lives in the same building as our shop, but it's large, heavy and takes up too much workspace, so she'll just have to stick with a decoder box for now....