Question about RCA F38310 38" TV

2 Answers

No power The f38310 when plugged in will run the DTV fan and fiber optics however the unit will not power up, no green lights, nothing. Checked dm1 board and found that two caps C14113, and C14115 are buldging and one appears to be leaking. However both test ok. Further checking revealed that cap c14127 tests bad. These crude tests were done with the components removed from the boad and using a DVM in diode test mode to charge and discharge the caps. C14113 and C14115 carged and discharged what appears normal and C14127 would not charge at all. I plan to replace C14113 and C14115 with 4700uf 25v caps. C14127 is a 10uf 63v cap and I will replace it with the same. Does this sound correct?

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  • 6 more comments 
  • Adam Phillips
    Adam Phillips Apr 25, 2008

    I did some further testing on the caps and found that the 10uf cap (c14127) is ok and that the two 4700uf caps (c14113 and c14115) were leaking and showing less than half capacitance. I have found appropriate replacement caps on ebay and will replace them when they arrive.

  • Adam Phillips
    Adam Phillips Apr 29, 2008

    Replaced caps today and now the TV will power up. However, I now have some arcing in the yoke of the picture tube. I do get a picture although it is a little washed out but when the arcing occures it washes the whole picture out. Not sure where to go from here. Seems like a voltage control problem.

  • Adam Phillips
    Adam Phillips Apr 29, 2008

    I used a can of air to clean the the inside of the TV and that didn't appear to help. I checked the yoke for any burns or scorching and all looks well. The Yoke is permanently bonded to the picture tube and there is a note on the tube stating not to attempt to remove the bonded yoke from the picture tube. I think the arcing in the yoke is a symptom of the real problem and not the problem itself. It seems to happen more often and more severe as the set gets warmer.

  • Adam Phillips
    Adam Phillips Apr 29, 2008

    The Yoke is permanently bonded to the picture tube and there is a note on the tube stating not to attempt to remove the bonded yoke from the picture tube. I think the arcing in the yoke is a symptom of the real problem and not the problem itself. It seems to happen more often and more severe as the set gets warmer.

  • Adam Phillips
    Adam Phillips Apr 30, 2008

    I am not a TV technician and perhaps I am giving you bad information. The area of the TV where the arcing is coming from is at the furthest end of the picture tube where a circuit board attaches to the end like an amplifier tube. This end of the tube is crystal clear and I can see inside where what I would assume is the cathode and the collector screens. The tube is a sealed peice of glass and shows no sign of contamination either inside or out. The arcing is comming from inside the tube. It is like somethig is chaging up and then after about 30 seconds to a minute a large discharge occurs inside the tube. If I am not mistaken the area that you want me to clean is at the other end where it attaches to the large glass picture tube.

  • Adam Phillips
    Adam Phillips Apr 30, 2008

    I am not a TV technician and perhaps I am giving you bad information. The area of the TV where the arcing is coming from is at the furthest end of the picture tube where a circuit board attaches to the end like an amplifier tube. This end of the tube is crystal clear and I can see inside where what I would assume is the cathode and the collector screens. The tube is a sealed peice of glass and shows no sign of contamination either inside or out. The arcing is comming from inside the tube. It is like somethig is chaging up and then after about 30 seconds to a minute a large discharge occurs inside the tube. If I am not mistaken the area that you want me to clean is at the other end where it attaches to the large glass picture tube.

  • Adam Phillips
    Adam Phillips May 01, 2008

    After some more poking aroun I found that C14730, CR14709, CR14710, and CR14750 are all bad. I believe this is the high voltage protection bridge circuit.

  • Adam Phillips
    Adam Phillips May 01, 2008

    After some more poking aroun I found that C14730, CR14709, CR14710, and CR14750 are all bad. I believe this is the high voltage protection bridge circuit.

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2 Answers

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  • Master
  • 6,966 Answers

Hi,

My compliments on the initial repair in the absence of a service manual (or a schematic). The arcing on the yoke does not necessarily indicate on over-voltage or a voltage control problem. It is possible that the CRT has just accumulated dirt, grime and dust further aggravated by the evaporated oil from the leaking capacitor(s). Perhaps you can just try cleaning the CRT especially those in contact or near the yoke. Additionally, you need to inspect the yoke for any burn out insulation (varnish coating). In some instances placing a plastic/insulator sheet between the CRT and yoke would also prevent arcing.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Apr 29, 2008

  • Louie  Role
    Louie Role Apr 29, 2008

    To my knowledge, a problem on the yoke would reflect on the display as either horizontal or vertical deflection irregularities. Additionally too high a voltage anywhere would burn a component down and chances are that the built-in protection circuitry would kick in and shut the unit off.

    Further, there would only be 4 wires normally used by the Yoke. Only 2 are used for the horizontal where high voltage is available to cause the arcing. The other two wires would be for the vertical whose output voltage is relatively low and therefore not enough to cause arcing.

    If I were to follow along your thinking that "the arcing in the yoke is a symptom of the real problem and not the problem itself" and having limited down to 2 wires and the horizontal circuit, perhaps you can concentrate on said area. Possible suspects are the HV caps.

    If you were to bear with me and further the cleaning of the tube, perhaps you can try a deeper cleaning with the use of an appropriate solvent and some cleaning cloth. If the dirt/grime/oil has turned into an sticky coating, then compressed air would do little to remove them. Additionally, you can try localize at what particular point/area the arcing starts from the yoke. With the deep cleaning done, try inserting a fishpaper or a plastic something between the yoke and the CRT.

    Would appreciate a post back for further updates/developments (or even the lack of any).

    Cheers.

  • Louie  Role
    Louie Role Apr 30, 2008

    My apologies for misunderstanding your description. I got the impression that the yoke was arcing towards the curved surface of the tube.

    I have to concur with Jaime867's post about a defective CRT.

    In my country, picture tubes can be re-processed with the rear-end replaced and the joint resealed, the frontend re-masked and the entire tube re-vacuumed.

    Alternately, there is a method of extending the picture tubes life a little bit longer and partially if not wholly removing the arcing (but of course you are only prolonging the inevitable). Should you be interested going this route, pls post back. This involves working with high voltages, the possibility of repairing (temporarily) making it usable for a little bit of time but likewise the possibility of completely destroying it. It is a 50-50 chance at best.

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  • Master
  • 2,267 Answers

Good Info you are providing here.
Try removing the yoke to add some varnish to get rid off the short you have. It has to be the same material that was use on the yoke to keep the windings together.

Posted on Apr 29, 2008

  • Jaime Hernandez Apr 29, 2008

    The yoke is the real problem, there has been reports on that arcing on that area.

    I think you could still remove it using some kind of glue softener.

    If the yoke can not be remove, that means the whole CRT might need to be change; but that will be too pricey.

  • Jaime Hernandez Apr 30, 2008

    That is a good info.

    I'm sorry to say that in this case the picture tube is causing the arcing and therefore will need to be replace.

    There is not much that you or a tech can do to fix that TV.

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