About Tv Tuner

Sometimes i got emails from fellow members about whether the TV tuner can be repaired or not. I told them that the components in it were very small and have complicated design. Some of the components do not even have part numbers especially the small SMD transistors and the schematics are hard to find too. You may look at the tuner board in the below photo. Some of the tuners have the silicone glue covering the whole board making troubleshooting even tougher. I told them, the best is to replace with a new one which can save their time. If they insist that they want to try repair they always can go ahead. Dry joints in the Tuner especially the pins are quite common. I wonder whether you all repair the tuner or have it replaced? Do you know of any website/company that repair TV tuner?

You may click on this LINK to read how to service the TV tuner.

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20 Comments

1. 

   Waleed Rishmawi

   September 23, 2010 at 8:35 am

   I my country we do not use it any more. sure, it is found in every tv set but if it breaks, we just use the av connection to connect any playing device to the TV set.
   the only time we connect to the tv tuner is when watching the local stations broadcast..but hardly people do that any more due to the spread of the digital receivers and sat dish.

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2. 

   Muzi

   September 23, 2010 at 10:34 am

   Hi Mr Jestine,

   I would like to learn TV repair. I'm a student in Kuala Lumpur but am interested in learning TV repair through direct training. Could you help. Thanks. Muzi

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3. 

   Jimmy Lane

   September 23, 2010 at 10:48 am

   Hey Jestine, this really brings back memories of the 80's working on tv's before eproms. My biggest problem back then was overlooking agc as the problem. Especially on snow symptoms. I would send off a tuner to PTS back then. Get back in and still snow. Finally turned out to be something stupid like a 100meg resistor open in the if circuit that developed agc voltage. You should check all voltages on the tuner good with a scope to make sure it is good and ripple free. Inject 45.75 if signal into the tuner output to make sure if and video circuits are all good. I used to disconnect the agc pin and use 9volt battery and pot to put a varying voltage on the line. If the snow cleared up or the picture came back clear the tuner was ok. I found a place online to repair and sell tuners for $27.00. www.tiptoptuner.com

   I hope this may have helped someone. Maybey some oldtimers who have been around the block like me on old tv's can relate to this.

   Jimmy Lane

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4. 

   admin

   September 23, 2010 at 11:21 am

   HI Waleed,

   That was a nice sharing!

   Jestine

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5. 

   admin

   September 23, 2010 at 11:54 am

   HI Muzi,

   Sorry i do not have TV training course. I only have these courses http://www.noahtec.com/workshop.htm

   Jestine

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6. 

   John Preher

   September 23, 2010 at 4:27 pm

   9-10 years ago I used to do a lot of tuner repairs in the RCA CRT TVs, they were famous for the "onboard tuners" that were a part of the main PCB and so they could not be replaced or removed and sent off for rebuild. Fortunately the main cause of failure was bad ground connections, the solder from the ground pads around the edge of the tuner circuit that connected to the housing would crack and need to be resoldered.

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7. 

   John Preher

   September 23, 2010 at 4:34 pm

   Also I forgot to mention, conection problems would also be on other areas with in the tuner as well and also the tuner problems would cause strange symptoms sometimes that would not normally be something you would suspect to be related to the tuner. Read some symptoms here and even get a template for some of the bad connections are sometimes located although this template does not show what I new to be the most common which was the ground connection failures. http://www.intechlabs.com/servicetech/bulletins/RCATuner.htm

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8. 

   admin

   September 23, 2010 at 8:43 pm

   Hi John,

   Thanks for the good tips.

   Jestine

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9. 

   admin

   September 23, 2010 at 8:53 pm

   Hi Jimmy,

   That was a fantastic tip! Thanks a lot!

   Jestine

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10. 

    Rich Beinlich

    September 24, 2010 at 11:41 am

    Here in the U.S. I only resolder the tuner if I suspect a tuner problem. I have fixed a lot of tuners with cold solder joints. There is a company here in the U.S. Tip Top Tuner that would fix tuners for $25 but I havent used them in awhile. You would send them your tuner and they would send you a replacement. I will have to find their website.

    Rich

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11. 

    admin

    September 24, 2010 at 7:30 pm

    Hi Rich,

    Thanks. The website is www.tiptoptuner.com as recommended by Jimmy

    Jestine

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12. 

    John Preher

    September 24, 2010 at 11:04 pm

    Wow, I can't believe tip top tuner is still around I used to use them back in the day as well.

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13. 

    Soldering Pots

    December 17, 2010 at 2:29 am

    Some have better video quality than others, some have hardware mpeg encoding processors so when you record video (esp HD video) it barley uses your CPU, others don't work in Windows 7 x64 so well.

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14. 

    Amir Mukhtar

    April 5, 2011 at 10:09 am

    thanks you Sir Jestine for sharing realtime knowledge to us.

    regards
    Amir mukhtar

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15. 

    haiqal

    December 5, 2011 at 6:17 pm

    Good day Sir,
    just wanna ask your opinion on my National VCR model NV-370 (manufactured circa 1986) it can play VHS tape very well despite of its age (almost 26 years old), but about 1-2 weeks ago it started to make problems on color (during playback; in black and white) and its motor (which is running the tape) is sometimes gone crazy as it spin up the tape intermittently during playback..this prob started after i attempted to record a movie from my DVD player (FYI,the Rec function never been used before) .. what i need to fix? it is still possible to fix it as i heard rumors that Panasonic dont have any spare parts for this model anymore..i'm so worried abt it..hope you can help me..tq

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16. 

    admin

    December 7, 2011 at 1:29 pm

    HI Haiqal,

    Since this is an old machine i suggest that you make sure the output voltages from the SMPS are good and no bad e-caps. A bad filter could cause many types of problem in VCR.

    Jestine

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17. 

    Anoop

    October 30, 2012 at 7:55 am

    philips calcom kit indian
    Sir,
    problem is some time cable tv signal is blue back screen that time FM mode not working(cable signal tested in another tv), pls help me sir
     
     

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    • 

      Jestine Yong

      October 31, 2012 at 8:59 pm

      Hi Anoop,

      If your tv screen is black and white picture try replace the baseband delay line IC. Once common part number is the TDA4665.

      Jestine

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18. 

    Ravindra

    November 13, 2015 at 12:42 am

    I have LG Flatron tv.during the tuning that tv display all channels.after tune finished not stored any channel.

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    • 

      Jestine Yong

      November 13, 2015 at 11:18 am

      HI Ravindra,

      Possible the eeprom ic have problem. Make sure the ic is receiving a good dc supply voltage.

      Jestine

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