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onji
Joined: 05 Nov 2014
Posts: 8
Location: Louisiana
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 Posted: Wed Nov 05, 2014 10:59 am Post subject: RCA 27R411T - Horizontal lines at top |
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Hello new here. Ive had these lines at the top of this tv for a few years now. I'd like to know if a possible cap swap would fix. Anyone know what location I should be looking for? Here are a few pics:
http://imgur.com/a/McqRP
Thanks |
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kuhurdler
Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS
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| Posted: Wed Nov 05, 2014 1:48 pm Post subject: |
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| that's often caused by an electrolytic capacitor in the vertical circuit. |
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onji
Joined: 05 Nov 2014
Posts: 8
Location: Louisiana
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| Posted: Wed Nov 05, 2014 1:54 pm Post subject: |
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| kuhurdler wrote: | | that's often caused by an electrolytic capacitor in the vertical circuit. |
Thank you for the reply. I've searched for a couple of hours now and cannot locate a diagram or manual for this chassis. Would you happen to know where one would be located?
Chassis: RCA ITC008FHM |
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JTS1957
Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away
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onji
Joined: 05 Nov 2014
Posts: 8
Location: Louisiana
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| Posted: Wed Nov 05, 2014 4:21 pm Post subject: |
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Thanks! I have located CF010. of course it appears ok, but I'll be replacing it. Is it common for the solder side to not have certain caps labeled?
see pics:
CF010 is in the center of the first pic. On the solder side in that area, its not labeled.
http://imgur.com/a/maAAF |
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JTS1957
Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away
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| Posted: Wed Nov 05, 2014 5:32 pm Post subject: |
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Could be they are labeling the parts that are mounted to each side of the board. Through-hole mounted components on top and foil / surface mount parts on the other.
Cap's shrink tubing looks like it may be discolored and 'shrunken tighter' due to years of exposure to the heat from the heatsink that's next to it. If that is the case it will also be bad. Low in value and high in ESR. |
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onji
Joined: 05 Nov 2014
Posts: 8
Location: Louisiana
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| Posted: Wed Nov 05, 2014 7:01 pm Post subject: |
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| JTS1957 wrote: | Could be they are labeling the parts that are mounted to each side of the board. Through-hole mounted components on top and foil / surface mount parts on the other.
Cap's shrink tubing looks like it may be discolored and 'shrunken tighter' due to years of exposure to the heat from the heatsink that's next to it. If that is the case it will also be bad. Low in value and high in ESR. |
Well I changed that cap, and the issue still persists. Can you suggest my next course of action? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away
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| Posted: Wed Nov 05, 2014 8:58 pm Post subject: |
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What does screen look like with actual video selected instead of blank raster? Has sound?
The 47ufd 50 volt cap usually cures it. |
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onji
Joined: 05 Nov 2014
Posts: 8
Location: Louisiana
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| Posted: Wed Nov 05, 2014 9:19 pm Post subject: |
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| JTS1957 wrote: | What does screen look like with actual video selected instead of blank raster? Has sound?
The 47ufd 50 volt cap usually cures it. |
That's disappointing. Yeah thats exactly what i used. I only turned it on to still see the same lines at the top. I didn't check any actual video I'll do that tomorrow. I do appreciate your help though. |
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onji
Joined: 05 Nov 2014
Posts: 8
Location: Louisiana
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| Posted: Thu Nov 06, 2014 1:14 pm Post subject: |
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Ok I'm an idiot. I installed a .47uf 50v instead of a 47 / 50. Ugh. I bought an assorted pack of caps because thats all they had locally.
I did manage to locate the correct cap however it has the leads coming out of each end instead of one end like the other caps. is that ok to use as long as i get the polarity correct? |
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