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you have shorted power transistor or mosfet on power supply that need to be replace however this need a soldering skills and electronic background if you don't have skills its better if you replace the whole power supply board.
The TV will need to be properly diagnosed to be sure of the problem. A defective power supply output, main board, LVDS cable connection, t-con board or t-con/LCD ribbon connection can cause video display issues.
Hi, If QH01 is shorted again, then this is an indication that the FBT is already faulty causing QH01 to shorts right away and blew E907(self destruct when shorts occured on the line). 100VDC isn't causing E907 to blew, you've only got 100VDC because the FBT didn't oscillate yet. Before you replaced the FBT make sure to test all parts parallel on the B+ line like DH09, Q701, CH16, CH13, CH20. It is better to pull-out the FBT while testing the shorted/leaky parts on the board to make your reading more accurate. If you found the said parts to be in good condition, then you have to replaced the FBT.
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Since you've already replaced the power cord and still the led light won't came on, this is an indication that the power supply board of your unit is dead. If it is not under warranty period(if so, avail it because the manufacturer will fix it for free) open the back cover and check the continuity of the fuse using the multimeter, if you found it open replaced it with the same current(ampere) ratings and then try to turn on the TV. If the replacement fuse blew again, this is an indication of more serious problem on that board. If the replacement fuse didn't resolve the issue, other parts on that board gone to malfunction as well. If this is the case, I would advice you to replaced the entire board for your convenient. The cost will almost the same rather than troubleshoot it. Check the actual part no of your board and check this LINK.
Yes, if there's no LED light at the front panel of the TV, this is an indication that the power supply is not working (I'm assuming that you've already tried to plugged it in to other working outlet). First thing to check is the internal fuse of the TV. If you found it open, replaced it with same current(ampere) rating and try to power it on again. If the new fuse blow again this is an indication of more serious problem in the power supply. You may replaced it with a new board or seek for an assistance of a qualified TV technician to troubleshoot the board.
If you found the fuse intact, still the same problem(power supply board).
Please let me know if you need further assistance.
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ha ha ha this problem is caused by the Y-SUS or Y sustain board (any name is used for it) if you open your tv you coud see around 4 big boards, the left is the Y-sus, if you test its two fuses you can see one of them are blown that means that your YSUS is blow it, the part is 6871QYH953A. and the price is from 35 (the fix kit) to 280. I'm sorry for my laugh but I had the same problem and found it that this model of board is LG and around 18 brands and diverse model of TVs have inside this piece of **** and all of them have the same problem sound and no image.
hey...glad im not the only one in this mess....thank god i have an electronics background as i my offer some help. i found that Q601/Q602 were shorted,replaced with NTE2582 transistors, but also there is another fusible resistor located next ti the transformer on the powersupply board(board G i believe)same as the other(1/4-1/2 watt .1-.15 omhs)well i thought all was well until i pluged it in and both fusible resistors and the transistors blew right away....led me to the H-OUT transistor, right next to the flyback, on the main board...sure enough it was shorted as well. that part is 2SC5148(not the NTE part #), , and will put it in after work tommorow...looks good so far and will, even with my mistake will cost several hundred dollars less than taking it to a tv shop...and thousands less that the plasma screen the wife wants....this 32inch has been good to me for 9 years, and im going to help it along for another if possible. you cant email me at firstname.lastname@example.org if youd like.....thanks and good luck
no sundog this model has the potenthal to be a nice tv when you saw the burn't resisters that was your clue to change the stk's now that you have fixed the res problem the bad stk is telling the set to shut down replace stk,s i ALWAYS change both (buy the way in the future those are hi watt res THEY SMOKED FOR A REASON maybe you thought they were installed in the 70"s ha ha. but they smoked because the stk's one or more are bad.
good luck doc