Question about Jensen TS2050J 20" TV

3 Answers

Lost green color in picture

I've lost the green color in my picture. I know very little but what I do know is that there are 3 "guns" that incorporate red, blue and green in order to give the TV color. I assume that whatever shoots the green, or the circuit board or power supply to the circuit board that shoots the green, needs to be replaced. I want to perform the work myself. How do I start?

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  • Elieng Nov 06, 2007

    Thanks. I will do that. I borrowed some books from the library and found that there is a single chip that takes care of the color, among other things. I don't own an oscilloscope so I can't check for a proper square wave or for the 3.58-MHz the crystal is supposed to put out. Can I just change out the entire IC or is there some output that the color output transistors should put out that I can check with a digital multimeter? Meanwhile where can I find a manual to download for my specific TV? Thanks.

  • Elieng Nov 07, 2007

    I've figured out that rather than replace the chip I should replace the CRT board. The problem is I can't find a service manual. Any ideas, please?

  • Elieng Nov 11, 2007

    Okay. No luck with the mauals. I can't find one anywhere on-line. Let's try a different approach. Is changing the entire board attached to the CRT difficult? Are they expensive? I figure it's easier to change out the entire board then the chip that controls color output. I would likely destroy the traces or vias and wind up having to replace the board anyway. Please, someone give me some direction. My wife will only tolerate the TV sitting in the living room floor for only a little while longer before she claims victory that men are always claiming to be able to fix stuff when they actually can't and are just avoiding the inevitable that a new purchase must be made. Help me fight the good fight, here. Signed, man-in-trouble.

  • Elieng Nov 11, 2007

    Thank you. I'm going to finally open up the TV tomorrow and swap the transistors around, as you suggested. Then, depending on what happens I will likely replace all three as a precaution. I'll let you know how it turns out. I have a bet with my wife riding on being able to repair the TV. Wish me luck.

  • Elieng Nov 11, 2007

    I'd like to give credit to both SparkGap and Benimur as they have both been helpful.



    SparkGap- It's not that I doubted you, man, I just lost patience and did not go the extra "click" that would've taken me to the manual.



    Benimur,



    I checked the output at the pin on the neckboard end of the cable connecting the neck board to the main board and found the Gy output to be only 700 mV while the By and Ry were both at 2.5 V. I then followed the cable to the IC and found the output there at the Gy to also be only 700 mV. My last check will be at the input pin corresponding to the Gy output to see if the problem is before the IC. In any event I don't own the sophisticated soldering gear to desolder any of these components without messing up the traces. I will likely by a new TV. But thanks to you guys for all your help. That includes Poohawk as well. Thanks.

  • Anonymous Mar 30, 2014

    I have 3 nv65ah siding guns that seem to try to shoot 2 nails at once. one goes part way into board the other gets jammed beside the driver pin and hangs the gun up. any idea where I should start replacing parts?

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Hi,

If I may add to the posts of SparkGap and Poohawk

Have not worked on any Jensen models since they are not available in my region, but your problem seems to be typical in most CRT models either TV or monitors.

Most models/version would have 3 transistors for the color drive in the CRT PCB. In some cases, it would be a single power IC block. Assuming yours is the transistor variety, you simply have to replace 1 of the three. These transistors are easy to recognize since they are the largest in the CRT PCB and would often be attached to a heatsink. Alternately, it is also possible that you simply have a cold solder problem. Some would exhibit good passive test (forward/reverse bias test with an Ohmeter) but would fail when active. A sure test is to simply swap the red, green and blue power transistors around. The missing color would be a different color now other than green if indeed 1 of the 3 fails when powered. In some extreme cases it is the collector resistor (normally 1 watt) that also fails. Should you be able to identify/determine which of the 3, you can purchase a replacement transistor or play it safe and simply replace the 3. I would expect that the cost of the 3 transistors would be less than the CRT board and perhaps more easily replaceable.

Hope this be of further help to you. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Nov 11, 2007

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Follow the following link. It isn't free, but it is the service manual.
Best of luck.
R-

Posted on Nov 07, 2007

  • Ron Roske Nov 07, 2007

    Oops! forgot to put the link in the last message. Let's try that again!
    http://www.servicemanuals.net/service.as...
    R-

  • Ron Roske Nov 07, 2007

    My apologies to both of you. Should have had a second cup of coffee before I posted that. You couldn't find it there, cause it wasn't there. Think that I'll go over in the corner and pout for awhile.
    Hope you guys have a better day than I am...
    R-

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  • 363 Answers

I would start by obtaining the service manual. It will have circuit diagrams and diagnostic procedures.

Posted on Nov 04, 2007

  • 2 more comments 
  • Martin B
    Martin B Nov 07, 2007

    Yes, difficult finding anything Jensen TV related!

    I'm under the impression that Jensen is Hitachi rebranded in which case:-



    http://www.manualuniverse.com/manager/pr...



    Otherwise the only way may be to contact PWW, they support TV's from Jensen http://www.pwwservice.com/main.htm



    Wish I could be more help, but I did search all my usual places and more.

  • Martin B
    Martin B Nov 07, 2007

    I couldn't find it at servicemanuals.net, where was it Poo?

  • Martin B
    Martin B Nov 07, 2007

    -

    Sorry the posted hyperlink didn't work you have to click http://www.manualuniverse.com/ go to catalogue and search for Hitachi TS2050J.

    Good luck

  • Martin B
    Martin B Nov 11, 2007

    -

    The manual is definitely available from Manual universe.

    Short of actually putting it in the cart to prove the point, heres a screenshot.

    You click TS2050 result after the search. It's not clear admittedly.








    -

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