Re: 55" Element tv turns on, no picture E4SJ5517BF
ok, whatever happened in post 25 was a setback, guess now we need to see if 12 volts is still coming from mainboard out to panel board, can you see if that voltage is there?
Re: 55" Element tv turns on, no picture E4SJ5517BF
Ok yes I should be able to check for 12v coming from the main board, as long as I leave the ribbon cable unplugged. Will check when I get home from work tonight
Re: 55" Element tv turns on, no picture E4SJ5517BF
Ok so I powered on the tv, with the ribbon cable unplugged. I'm getting 12v at the proper pins on the cable. Also, with the ribbon cable unplugged, I'm seeing weird readings on this fuse and the 2 caps next to it. I'm getting a dead short to ground on both sides of the caps and fuse. I'll probably desolder the caps first and see what happens.
Re: 55" Element tv turns on, no picture E4SJ5517BF
how is the fuse in diode/continuity mode probe on both ends? ok, de-solder one cap, then check it out of circuit and test the pads where it goes then retest the other one in circuit if short is cleared then you can leave it in place of course. it's usually only one cap that is bad.
Re: 55" Element tv turns on, no picture E4SJ5517BF
Well I desoldered the 2 caps next to the fuse. I still get continuous beeping on both sides of the fuse, when checking to ground, and a reading of 122 ohms. Must be another component farther down the line that's shorted.
Re: 55" Element tv turns on, no picture E4SJ5517BF
These 6 little holes seem like they might be connected to the other side of the board, in which I could follow that trace. Not sure how it makes the connection without any components going through the board.
Re: 55" Element tv turns on, no picture E4SJ5517BF
need to find the short, did you test all the caps like you did with those 2, one side should beep to ground the other should not, some of your tcon voltages were not right, might have problems with 1 or both of those chips Dskall described. maybe look up the data sheet for those 2 chips.
Re: 55" Element tv turns on, no picture E4SJ5517BF
Yes I pretty much checked every component for a short to ground. I think there was another group of caps acting the same way as the caps by the fuse...one side would read close to 0 ohms and the other would read around 150. I'll check them again tonight. In post #19, dskall sent a link to a schematic which was close to mine but not exact. If he couldn't find the exact one for my board, I probably wouldn't have any luck.
Re: 55" Element tv turns on, no picture E4SJ5517BF
I also have to add that sometimes when checking some caps, the reading would continuously beep on one side, then give a short beep on the other side, but with a low ohm reading...around 100 or just above. Since the components are in circuit, I'm guessing I can't get accurate results
Re: 55" Element tv turns on, no picture E4SJ5517BF
it's very difficult troubleshooting, maybe the key is finding out what component/s are responsible for the tcon test points that are not reading proper voltages, you might not have an easy to find test point for all of them, here is about what they should be: [vdd:3.3] [vgh:20-30] [vgl:minus 5 to minus 12] [vcom:5-7] [von,vgh,vgon,vddg: 20-30] [voff,vgl, vgoff, veeg: minus5-minus9] [vdd, vlogic, vddd, dvdd: 3.3] [vda, avdd, vdda, vsource: 13-20] [vcom: 5.5-8.5]
The group of 4 circled capacitors(pic) measured .45v, but when switching the test leads, they measured 0v. The single circled capacitor(pic) measured 0v, with test leads both ways. The rest of the caps ranged from .1v - 1.8v. All were tested in diode mode.
check the components near the chip in the first picture, be sure to check the transistor and resistor right above those 4 caps.
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