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15 inch flat screen no power but use to work

This is from a cal spa entertainment spa. it has a 15 inch flat screen TV monitor that use to work then for no reason stopped working. at one time the red light on front as well as a screen with some dim light was visible.

I had a tech come out and he was not an expert on the electronics., but did say it was not the external power supply. The unit is connected to a power supply similar to what a car setup would be.

I have the unite out of the spa and have the waterproof cover off and am able to see the inside. I have no idea of the brand, I am still looking into it.

My plan was to see if there was a power short or other circuit damage. I purchased a multimeter and was hoping I could simply touch one end to the other to find which circuit was out. Trial and error.


Questions
Do I have to have power going to the boar to test of can the tester supply the current needed to complete the circuit and measure?

Is there info on how to properly test circuits, what setting I should use on my V.O. A tester?

On a chip which prong would be positive and which would be negative especially with chips with multiple prongs?

Once I ID the chip, I'm assuming I could remove it with a soldering iron and buy a replacement somewhere, re solder it and test again.

Any suggestions, I’m trying to avoid spending a lot of case especially now that cash is tight.

Andrew

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  • Andrew Selvaggio Jan 06, 2009

    This is from a cal spa entertainment spa. it has a 15 inch flat screen TV monitor that use to work then for no reason stopped working. at one time the red light on front as well as a screen with some dim light was visible.

    I had a tech come out and he was not an expert on the electronics., but did say it was not the external power supply. The unit is connected to a power supply similar to what a car setup would be.

    I have the unite out of the spa and have the waterproof cover off and am able to see the inside. I have no idea of the brand, I am still looking into it.

    My plan was to see if there was a power short or other circuit damage. I purchased a multimeter and was hoping I could simply touch one end to the other to find which circuit was out. Trial and error.


    Questions
    Do I have to have power going to the boar to test of can the tester supply the current needed to complete the circuit and measure?

    Is there info on how to properly test circuits, what setting I should use on my V.O. A tester?

    On a chip which prong would be positive and which would be negative especially with chips with multiple prongs?

    Once I ID the chip, I'm assuming I could remove it with a soldering iron and buy a replacement somewhere, re solder it and test again.

    Any suggestions, I?m trying to avoid spending a lot of case especially now that cash is tight.

    Andrew

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6 Answers

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Hi Andrew.

To start if monitor light is on, that usually means that the power supply is working.

To test power supply you need to read voltages on the low voltage connector that hooks up into the screen, using a multimeter (see here).
You set mutimeter to volt reading , and the power adaptor must read +- .5 volts respect to the value written on the tag.

If the light is on , it is more likely a faulty inverter or a defective lcd control board (main board). This are difficult to test, and may be not worth repairing.



Posted on Jan 09, 2009

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Hi and welcome to FixYa,

Initially if it is a LCD TV, you may want to consider an over simplified diagnosis and repair procedure:

  • power up the TV normally;
  • get hold of a flashlight;
  • press the volume control (either on remote or front panel);
  • shine the flashlight at an angle to where the volume level used to be displayed;
  • determine if you can see some semblance of the volume indicator/level albeit will be very dim;
  • if yes, then probably CCF Lamps (likely) or inverter problem (most likely);
  • If no, and there is no sound, then probable failure in the internal power supply/voltage regulator board (most likely);
  • If no, and there is sound, then probable failure in the video interface board (most likely).
There would then be 2 approaches to the DIY (do-it-yourself) repair:
  • board replacement - first you need to determine the brand and model;
  • component level - fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron would be required.
It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings.Should you be uncomfortable performing a component level DIY, perhaps your best bet would then be to seek the services of a qualified professional. If the cost of repairs and downtime would be factored in, then you may have to re-evaluate your options and consider a replacement.

Good luck and Thank you for using FixYa.

Posted on Jan 06, 2009

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Good afternoon, selvaggio1!
I have to agree with most of the advice that you have been given so far. There is one possibility for a low dollar fix, maybe.
Take a real close look at both sides of the various circuit boards. What you are looking for is water stains. Sometimes moisture will get on the boards and when it dries, it will leave a residue. This residue can cause a short, or a high resistance bridge between components. If you find something like this, get your hands on some rubbing alcohol (90% is best) and a soft bristle brush and wash off the stain. Sometimes, it takes some effort to get them totally washed off. This technique may, or may not work (I've found that it works about 20% of the times that I've tried it), but is sure worth the effort, when it does work.
I hope that this information helps in the resolution of your particular problem, and have a super day!
Ron

Posted on Jan 06, 2009

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Hi

The best hope is that you can open the case and find a cable loose or find where water has infiltrated and caused some kind of electrolisys etching. Try each ribbon or cable connection inside the monitor to see they are fully connected. If you do not find anything like that, Your Main board is most likely the bad part. Normally a 15" televsion has two boards, power supply, and Main baord. The Main board does 95% of all the functions other than the LCD screen.

You will not be able to unsolder and resolder surface mounted components with a soldering iron. You would spend a great deal of funds to get the right equipment to resolder the new chip, even if you found the right one. The normal method is to discover which board is defective and order one from www.partstore.com. Your Main board inside the unit is probably the defective board. Your main board carries most of the functions like backlight and video controls. The main board for the one 15" television I have costs 172.00 and I can buy a new 15" LCD TV for about $200. Not worth the effort. The cheapest way if your patient, is to look for a model just like the Cal spa unit on Ebay with a broken screen. You might be able to scavenge the parts, and take a chance that they are good.

Please give me a good rating on this. I hope I save you from buying a lot of stuff that will not help.

Posted on Jan 04, 2009

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Hi, Firstly can i say that i dont know much about T.V. repairs but i do understand the componet make up of microchips. If you intend to test the chip you will need an oscilloscope to test it not a multimeter. You will not get any helpfull reading with a multi meter on a chip. You can test curcuits on the board and the mains power coming in to the board but that is it. I had the same ish problem with a TV unit myself and it was actually the internal power pack that was at fault. They are normally a item which is not repairable unless you are the manufactor.
Hope this helps?

Posted on Jan 04, 2009

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That seems like you have a moisture problem and is going to be expensive to fix!! best bet new one diferent brand!

Posted on Jan 04, 2009

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