So, I've got a friend who had this TV die on him and instead of paying to have it repaired, he bought a new TV and held onto it. Enter me... I stop by to say Hi one day and he asked if I'd like to take it and try to repair it, and that I can have it /shrug. Why the hell not, I repair computers every day.
So the symptoms were that when he goes to turn it on, it clicks and then clicks again turning off. I instantly said "Power Supply", which he was told was an expensive fix, hence buying a new TV instead. Knowing that a PSU on these things is just a series or easy to get to flat PCB board with capacitors, I took it on.
Last night I cracked open the back casing and got to the motherboard. Right off the bat I saw 2 blown capacitors, 1000uf/10v, some crappy brand I"ve never seen before. So I take the motherboard out, check the capactiors with a Blue ESR meter (the ones not showing signs) and all but the blown ones seem to be fine. I replace the two blown ones with Rubycon 1000uf/16v caps that I had from a previous bulk order from BC.net. Slap the entire system back together (checking that all cables are plugged back in (very easy) and I go to power it on.
The samsung TV on chime players and I don't hear a clicking or the TV turning back off... great sign
... until I realize no video 
. Worried I had failed to plug something back in, I opened the case again and checked, but everything is back and snapped all the way back in.
Being in a VERY dark room (at 3am :P) I put a bright headlamp up to the LCD and can see that there is in fact a picture being drawn, so that portion works just fine. However no back-lighting.
I don't know enough about LCD TVs to know how to solve this problem per se. I realize it could be an inverter, but is all of the circuitry for the inverter apart of this same motherboard? The two back-light cables (white and pink) do plug in on that same board. Any good way to test for what is causing the back-lighting to not come on? I'm starting to wonder if I should order all of the caps needed to replace all of them or is there something else I'm missing. I do have a multimeter but am next to clueless on how to use it, was a Christmas gift.
Any help would be awesome, would love to have this TV up and going before my wife has our baby so that she can watch some TV in the bedroom when she is on bed rest. Thanks guys
So the symptoms were that when he goes to turn it on, it clicks and then clicks again turning off. I instantly said "Power Supply", which he was told was an expensive fix, hence buying a new TV instead. Knowing that a PSU on these things is just a series or easy to get to flat PCB board with capacitors, I took it on.
Last night I cracked open the back casing and got to the motherboard. Right off the bat I saw 2 blown capacitors, 1000uf/10v, some crappy brand I"ve never seen before. So I take the motherboard out, check the capactiors with a Blue ESR meter (the ones not showing signs) and all but the blown ones seem to be fine. I replace the two blown ones with Rubycon 1000uf/16v caps that I had from a previous bulk order from BC.net. Slap the entire system back together (checking that all cables are plugged back in (very easy) and I go to power it on.
The samsung TV on chime players and I don't hear a clicking or the TV turning back off... great sign
... until I realize no video . Worried I had failed to plug something back in, I opened the case again and checked, but everything is back and snapped all the way back in.Being in a VERY dark room (at 3am :P) I put a bright headlamp up to the LCD and can see that there is in fact a picture being drawn, so that portion works just fine. However no back-lighting.
I don't know enough about LCD TVs to know how to solve this problem per se. I realize it could be an inverter, but is all of the circuitry for the inverter apart of this same motherboard? The two back-light cables (white and pink) do plug in on that same board. Any good way to test for what is causing the back-lighting to not come on? I'm starting to wonder if I should order all of the caps needed to replace all of them or is there something else I'm missing. I do have a multimeter but am next to clueless on how to use it, was a Christmas gift.
Any help would be awesome, would love to have this TV up and going before my wife has our baby so that she can watch some TV in the bedroom when she is on bed rest. Thanks guys
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