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Why won't my samsung LN52A TV audio/video turn on

A friend gave me his non-working Samsung LN52A530P1FXZA. When you plug in and tap the power on/off you hear a click and a little red light starts flashing once a second or so above the power on/off spot. No audio or video. When he gave it to me the unit had been unplugged for a few weeks. Also tried holding the power button on while plugged in and not plugged in - while plugged in this elicits that same click sound every 15 seconds or so - with no further effect.

I have taken the back off and examined the power board but nothing is visibly damaged or broken that I can see.

I’m not an EE tech sort, but not afraid to learn and try things. Including buying tools I might need. I have a multimeter and an ifixit kit.

Appreciate any guidance I may receive here.

Update (09/06/2018)

hopefully I have managed to upload a pic of the power board here.

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@mdedwards

You got all the tools you need :-). The very first thing to do is to follow a basic approach to testing a few things. To determine if it is your power board follow this along:

Does proper Stand-By DC STB5Vappear at BD100?

If No

Change the Main Power assembly

If Yes

Does proper Inverter DC 120V appear at CN801 in IP?

If No

Change the Main Power assembly

If Yes

Does proper Inverter DC 120V appear at CN801 in IP?

If No

Change the Main Power assembly

If Yes

Does proper DC STB3.3V appear at C101?

If No

Check IC105 Check the Main board

If Yes

Does proper DC D3.3V,B8V,CORE1.1V appear at C108,C110,C137?

If No

Check IC101,IC108,IC102 on the Main board

If Yes

Does proper D1.8V,A2.5V,A1.2V appear at C115, C111, C112?

If No

Check IC104, IC106, IC107

Let us know what you find. We do not have a good picture of all of your boards etc. to point all of those components out. So, see if these work or you’ll have to do that and tell us what you find. Of course you should also measure the power board connector and compar that to the values printed on the board.

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Hey Michael,

The televisión sounds like it is experiencing a bad power supply board. A common occurrence is for a capacitor to go bad or fuse or diode or resistor. The only way to determine what component is bad is to systematically check each one by removing it and testing it with a multimeter. If you want to avoid that, you can just skip it and purchase a whole new power supply board. Hope this helps.

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Unfortunately there is no visible damage to guide a priority or order to use. Is the order you indicate "capacitor, fuse, diode, resister" intentional or do any of these components tend to be most suspect?

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This appears to be a relatively common problem and is likely traced to the main board. There is a repair kit available that includes an IC and a capacitor that need to be replaced on the main board for $15. The main board can be sent out for repair as well. Look online for a service shop for that though. I have included the link to the repair kit below.

Dan

Link: https://www.ebay.com/itm/REPAIR-KIT-FOR-...

Note; There are a number of different main boards for this model. If your board does not match the ones listed in the above link. Go to shopjimmy.com for additional repair kits for the other board options.

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Hi Dan - the repair kit info describes the problem as:

-TV turns on briefly, has no video on screen then shuts off, comes back on, shuts off, repeat.

-Takes 10 – 60 seconds to turn on, stays on for a bit and shuts off, comes back on, shuts off.

-Red power LED blinks forever, TV doesn't turn on.

In this case the third item "Red power … doesn't turn on" is accurate, but the first two symptoms don't occur. That is, the TV does not turn on (no audio or

video).

Given that, would you still diagnose possible main board failure fixable with this kit?

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Start with the power board. I have seen the main board cause a similar problem as described, but it seems that in your case, the set is not on long enough to pop up the screen. These are similar problems, but yours may be due to the power board. If you can, post a picture of the power board too.

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