Need help identifying parts and recommendations on getting started on tv repairs.

Discussion in 'Career Advising' started by Stk.Goose, Aug 12, 2015.

  1. Stk.Goose

    Thread Starter New Member

    Jul 23, 2015
    23
    1
    I am new to tv repairs and want to get serious making it a full time thing. I have looked at about 14 tvs for a company and have managed to repair about 5 which is not a good ratio in my mind but i am new to it. I am running into many problems as in running into parts which dont even seem to come up on google such as diode 1k4 jf . In circuit it seems shorted but out of it it shows voltage drop of .147 and just wanted to see a data sheet so if anything i can find an equivalent . Another thing i have bought some basic things like multi meter, solder iron, esr meter , heat gun , and small things like screw drivers and what not but i want to know what is recommended as far as an oscilloscope and would i need to invest in a lcr meter ? alot of these power boards i feel like i have tested every component ecept the transformers and inductors but i still get a 0 v output even when i short the pson with the 5 v so out of frustration wondering if there is better way to test out the mosfets besides checking for shorts with multi and equipment for testing out the transformers and inductors. What am i missing here , it can be really fun but at times seems extremely frustrating. I have basic knowledge on electronics , I am studying electrical engineering but doing this on the side to help pay for school and only have 2 semesters left. I started with laptops , desktops , and cellphones but i see greater profit in tvs since some tvs i have fixed for a mere 3 dollars . Thanks for the input and thanks to anyone with valued advice.
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
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    find out the most popular brand of tv, and specialise in repairing that brand. there are so many brands and so many parts only used by one brand these days, it is impossable to run a shop taking in all brands. contact the manufacturer, and sign up as a factory repair shop for your area, then you can get the service info and parts.
     
    absf likes this.
  3. Papabravo

    Expert

    Feb 24, 2006
    10,148
    1,791
    I think this enterprise is a complete waste of time. When TV's go bad people replace them rather than have them repaired. If a TV has a cost of $250.00 how much are you willing to pay to have it repaired? As the repair cost approaches the replacement cost people will choose replacement.
     
    Last edited: Aug 14, 2015
    #12 likes this.
  4. #12

    Expert

    Nov 30, 2010
    16,316
    6,818
    The TV repair industry and the stores that sold the parts for TVs have gone out of business by the thousands. The only viable niche I can imagine is in making house calls to repair Big Screen TVs.
    The, "better way" is to understand the circuits, measure voltages, and trace signals. How could you think that un-soldering and measuring every part in a TV is a profitable diagnostic procedure? Compare that to the time required to make a dozen measurements and replace the part(s) that is(are) bad.
     
  5. Papabravo

    Expert

    Feb 24, 2006
    10,148
    1,791
    Let me add that with modern surface mount technology you are quite likely going to destroy the circuit board by trying to remove components without some pretty sophisticated equipment. The quality of a repair could never approach the quality of the original unless you have extraordinary skills which take a considerable investment in time and material to acquire. In a word "fugeddaboudit".
     
  6. absf

    Senior Member

    Dec 29, 2010
    1,493
    372
    All of the above are true. If you want to do repairing TVs for hobbies and fun and also a little incentive for paying your petrol and pocket money. It would be still possible.

    I'd rather repair something more expensive like musical keyboards and digital piano. The main boards are usually multi-sided and use SMD. But the analog boards and panels and PSU are usually single sided and through hole. The LCD are usually big and use GLCD. If it is bad you can do nothing and just have to order a new one.

    The problem is you have to get an authorised agent to give you the authority to repair their brand of musical equipments. This will grant you the password to get the service manuals and ordering parts from them.

    In third world countries I can see that repairing CRT TVs can still earn a living but not for long. People now are throwing their CRT TV for the flat screen TVs as even the named brands are getting cheaper each day. Only those Chinese-branded are really cheap. A Sony DVD player may cost 2-3 times more than the Chinese ones but it also lasts 2-3 times longer in usage. I have changed 5 Chinese DVD players every 18 months but my Sony and Samsung ones are still working fine.

    Allen
     
    Last edited: Aug 15, 2015
  7. BR-549

    Well-Known Member

    Sep 22, 2013
    2,004
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    Bad idea. Component level repair is over. Even if your real good at it, the cost and time of a replacement board will beat you.

    Most people would rather spend $99 on a new board, than pay you $59 and to replace a 25 cent resistor.

    And as mentioned, pretty soon you will need a microscope to look, let alone repair anything.

    If you like component level work,... design, restoration and hobby is about the only thing left.

    Every year the number of repaired boards goes down. If you’re a young fella, you might consider embedded systems and Internet Of Things.

    I believe this stuff will be everywhere, no repair, just replace.

    Control, Coding, and Networking is your future.

    I use to do a lot of commercial board work. We didn’t have time to order and study prints.

    We used an octopus. It takes a little time to learn properly, but you can troubleshoot a board in short time, without applying power or knowing the function of the board.

    When we got a dog(unknown fault), we just replaced all board components.

    The industrial markup allowed us to do this and give a great warrantee. The money was great.

    I doubt one could do this today.
     
  8. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
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    What is this ??
     
  9. BR-549

    Well-Known Member

    Sep 22, 2013
    2,004
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    Here you go.

     
  10. peter taylor

    Member

    Apr 1, 2013
    106
    5
    it would be worthwhile on more expensive equipment or higher power equipment
    occasionally you get a blown diode in a power supply of a monitor which makes a quick repair, but seriously, they have three parts. Power supply board, Signal Board, Screen.
    Your diode will be a schottky diode in series with a transformer winding. these have a forward voltage drop < 0.2v, unlike the normal 0.6v
    these dissipate less energy and have fast switching times. in circuit, you are measuring the winding resistance, < 1 ohm.
     
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