Question about Olevia LT37HVS 37 in. LCD HDTV

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Television will not come on, blue light stays lit

Television will not come on, blue light on front stays lit, used to go off then the picture would come on with the sound. Woke up this morning and tried to turn on with remote but the blue power light just kind of dims then goes back being fully lit up. I can hear a click also in the television when you try to turn it on. This is a 5 year old Olevia 42 inch. Help!!

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Jtoddweaver, Check out some YOUTUBE videos of lcd monitor disassembly and lcd monitor repair so you will know what you are looking for that is bad on your unit's "switch-mode-power-supply" printed circuit board. If you do the repair to the board, please document your "tear-down" with video or digital still pictures so you can complain to OLEVIA about poor quality capacitors they installed on power supply and also aid in the reassembly process. Do some reading in the fixya profiles of "budmrtn" "buddymc" "12fixlouie" and follow links you find there. Bye for now 12fixlouie

Posted on Jul 31, 2010

Testimonial: "You were right, capaciotors are swollen, looks like it might be a save! thanks!"

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  • Louis Ebert Aug 03, 2010

    jtoddweaver, Is it possible for you to read the "brand-name" of the swollen / leaky electrolytic filter capacitors that you found populating your main power supply board? "CapXon" "ELITE" and "JunFu" are some that are not nice to have found on board. Will you be doing the repair, or contracting out the work to local technician? Did you visit YOUTUBE? Have you researched the reason why caps failed in your unit? They should not fail for 15 to 25 years in properly designed circuit! Also do a "magnaifying glass" inspection of the bottom side of SMPS board for "frosty looking" "dull" "cold" solder connections of all "through-hole" and "surface-mounted" components. All should be "wedding-band" bright and polished looking in appearance. 12fixlouie

  • Todd Weaver Aug 03, 2010

    12fixlouie, The caps are capXon brand, I have some background in industrial electronics, but I am in the A/C refrigerantion business now. I need to do a little more research before I perform the repair, I understand that I need "low esr" caps? Is this correct? I looked on digi-key and found most but were of general purpose use. Thank you for responding to my request, I almost didn't tackle this but I knew if I put forth the effort that I could probabaly repair it.
    Got any idea were the best place to order caps from? Thanks again!

  • Louis Ebert Aug 04, 2010

    jtoddweaver, Remember the caps must be placed correctly in the holes in the board. negative to negative and pos to pos!!!! take extreme digital close-up pictures before you remove bad guys from the board, and have sharpy marker to make note of polarity on board!! These are not motor-start caps you are dealing with! Replace with 105 degree "C" only. Nichicon PW series seem to be ok with me. Any name brand will be better than those CrapXon things! Replace with same voltage and capacitance rating as originals. You might even find some that will work at Radio Shack, but will cost more than digikey or newark, jameco. Also inspect the CCFL inverter board step-up transformers for proper soldering to the board be it through-hole or surface mount types. I'm just nw of Chicago, and on layoff from manufacturer of communication hardware and software products that make "one-arm" bandits talk to a mainframe host in places like Vegas, New Orleans. Bye for now. 12fixlouie

  • Todd Weaver Aug 04, 2010

    I should have taken pictures before unsoldering some of the caps, ! have taken out four but did not think about polarity, like you said , I'm used to dealing with ac caps and motors, ****!
    I labeled each cap and where it goes but not the polarity, maybe someone has pics of my particular power supply. So far that looks like my only screwup.

  • Louis Ebert Aug 04, 2010

    jtoddweaver, Yes, stuff like that happens. You might be able to correct situation!!! Need to have DMM to do circuit tracing on the board. Tell me, were there any top side of board "markings" from where you removed bad caps from?? Hole near a "shaded" hole will be negative terminal. positive terminal might have a + sign printed near it?? Else, if no marking then you need to trace with meter the negative lead of some other electrolytic filter capacitor that is on same or different board. Then trace back the positive lead copper foil traces of the board, making notes and crude "layout" drawings on paper so you won't get lost. Life's a bi___ without schematics!!! In lcd monitors there are only 2 supply rails, a +5v and +12 to +15vdc. The +5 for digital logic stuff and +12 for CCFL inverter operation. TV may have seperate rail just for audio output power. Keep me informed of what you do to correct situation. Also make list of all caps by voltage rating and capacitance and let me know what they are. Also give a call to local technician and ask him if you might be able to photograph a Olevia SMPS when he works on one. 12fixlouie

  • Todd Weaver Aug 05, 2010

    i appreciate your help, i will look at the power supply board tonight and bring it to work with me tomorrow, juggling work and repair, whew!!!

  • Todd Weaver Aug 09, 2010

    I was able to trace back the all the negative and positive sides of the capacitors. I double checked, then marked the board with a sharpie marker showing value and polarity, won't make that mistake again. I removed all of the "swollen" or puffed up caps. There are some smaller ones of much smaller size and value, i think 10mfd, that look ok. Would you just change these also or check with DMM and leave in if good?

  • Louis Ebert Aug 09, 2010

    jtoddweav64, The 10uf caps should be replaced also if same "brand" as failed units are!!! What is brand name of failed units you removed?? Local tv shop technician might have a "C" meter to measure them! I own an old Stanford Research Systems SR720 LCR bench unit that I use for testing coils and caps. You should also visually inspect the pc board for "cold" "frosty looking solder joints of the soldered leads of the "heavier" and more "weighty" components mounted to the board. "thermal-stress fractures" of the leads should be cleaned and resoldered.

    Manufacturers sometimes use "hot-melt glue" to "fix" in place these components which are subject to "vibration" during shipping!!! 12fixlouie

  • Louis Ebert Aug 09, 2010

    jtoddweav64, Just FYI for you!! A dc supply +12volts used in typical lcd monitor to provide "inverter ballast circuit" to light-up the CCFL's. Only a "converter" type ballast circuit (ac to ac) used to light-up those new style, curlie-Q, screw-in, energy-efficient, CFL light bulbs you see at Home Depot or Menards or Ace Hardware!!! 12fixlouie

  • Louis Ebert Aug 24, 2010

    jtoddweav64, 8/24/10 Hi, what is status of your 42" Olevia? Were you able to bring it back from the dead? Did you inspect all of the solder joints on the SMPS board looking for frosty, "cold" solder connections that should be "touched-up" with soldering iron? Are all the replacement caps installed? Six or seven years ago, the computer motherboard manufacturers had same capacitor problem!!! Yes, even the manufacturers of power supplys for desktop pc's had their share of "bad" caps in their supplys. The days of good ole LINEAR power supplys are now a thing of the past. A typical linear supply with same output rating as a SMPS for a pc would weigh more than 10 times that of a typical SMPS! Can you imagine your pc being a "24cans of bud-lite" heavier!!! Do a reply at lmistyrel over on aim. com or here on fixya when you get some free time. 12fixlouie

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  • Master
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Hello,

Ur power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Good luck....


Posted on Jul 30, 2010

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