REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 23 April 2019

HOW TO REPAIR LED LAMPS



    How to Repair LED Lamps



     

    The LED circular lamp in our dining room  went off suddenly. This is after about 2 years in operation.   One set of two LEDs were found faulty.  This article serves to share how to troubleshoot and repair this LED module.  The procedures described here can be used also on other types of LED lamps

    How LED Lamp Works?

    Unlike normal fluorescent lamp,  LED lamp does not have fluorescent tube nor ballast;  instead,   it has the following components
    1.   The LED element;
    2.   The LED  driver;
    3.   The Aluminium heat sink.  
    https://2.bp.blogspot.com/-Yi5WL5U9yVU/XGDmeynzy_I/AAAAAAAAD4U/TYHNv7DmBNYE45niWDW5-L5_h6U2m-xkwCLcBGAs/s1600/2018-11-13_15h37_11.jpg
    As current flow through the LEDs,  it causes the LEDs to give out lights.  Depending on the size and power of the lamp,  a  LED driver can supply different wattages to several LEDs arranged in series.    In this case for the 18 watts circular lamp,  the driver will supply 48 Volts to the LEDs.   Each LED will operate at around 3 to 3.6 Volts and consume around 0.5 watts of power. There are about 36 LEDs in this 18 Watts lamp.   The LEDs are arranged in an array as illustrated in the following
    https://1.bp.blogspot.com/-iQ_uNkDG9jg/XGDrNIKLRxI/AAAAAAAAD4g/0OPE9Fi-sAwXiepZjpsJqOHdHNAoTy6ZQCLcBGAs/s1600/2018-11-13_15h04_57.jpg

    What can usually go wrong?

    The LED driver consists of very few components as shown. 
    https://1.bp.blogspot.com/-8qyz-02wFaA/XGDrbyOSJdI/AAAAAAAAD4k/fSiFOWNF_JonCaHq57KgEAsjnyNV7OnbACLcBGAs/s1600/2019-02-11_09h32_01.jpg
    It is unlikely to have broken down as it is quite robust and reliable.   Most likely the LEDs are the ones at fault.

    What’s Needed?

    There is no special and expensive tools needed.  
    Description
    Remarks
    (doubleclick to enlarge pictures)
    1.  Two numbers of 1.5 Volts AA or AAA battery,  improvised as LED tester
    Solder them up in series as shown
    https://3.bp.blogspot.com/-xR_kZVA7DUI/XGDr7NuPVCI/AAAAAAAAD4w/nW2eC8Ih7tkWzyFOOszJ-JtnxaCd-6zvgCLcBGAs/s1600/2019-02-11_10h21_05.jpg
    2.  LED elements
    They are available from various online website such as AliExpress.  100 piece of common type of LEDs cost less than USD$1/=
    https://2.bp.blogspot.com/-pt-x57K_D5U/XGDs3kHG1AI/AAAAAAAAD5E/_dce_OhiaFE_B8ke995h8tsK8SJ3oeBIgCLcBGAs/s1600/2018-11-13_14h31_56.jpg
    3.   Soldering tools
    Soldering irons and solders

     Repair Step by Step


    Description
    Action
    Remarks
    (doubleclick to enlarge pictures)
    1. Inspection & testing
    1.  Go through by inspecting the LED one by one.
    2.  One could also light up the LED by touching their ends using the improvised LED tester.   The pair of LED should light up unless they are faulty.
    Faulty LED can be easily spotted by its burnt mark as shown
    https://2.bp.blogspot.com/-wzVlGrPi_IQ/XGDsFzYxCEI/AAAAAAAAD40/w3QBCJmZrnQV4_f3UjAGbqvN8I_UUeSggCLcBGAs/s1600/2019-02-11_09h33_32.jpg
    2.  Unsoldering
    1.  Unsolder and remove the faulty LED from the board using the soldering iron.  
    2. Carefully solder the new LED after having identified the locations of the Anode and Cathode and place it back into the correct position
    The cathode is identified by an additional plate at the end of the tips as shown
    https://3.bp.blogspot.com/-jsFoHJ1muqA/XGDtOOcnhKI/AAAAAAAAD5M/ioJuFgO4FbAd5UFhxDfAON1ETYBnNVQfACLcBGAs/s1600/2019-02-11_09h05_18.jpg
    3.  Final Testing
    1.  After soldering,  test the repair  using the improvised LED tester.
Posted By: FRANK at 08:55
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