Mulja tv repair portal
Equipment Repairs => LCD TV forum => Topic started by: kennyc on April 07, 2015,07:16:30
-
Hi Guys . Tv has power supply 17PW07-2 in it . Problem is I think it has an LED Driver board attatched to the screen .Read about it on Badcaps site The power supply seems to feed voltage to a plug that goes behind the metal on the screeen . Dont know if fault is on power supply board or behind the screen on this LED driver board. No brightness on screen as if inverter was faulty. Dont know if any of you had same fault . Thanks if you can help
-
17PW07-2
-
Thanks Jordan . Problem is I dont know if this board has the inverter or LED driver on it or if there is a seperate board inside the metal that surrounds the screen . Read on another site that there was and you had to take the screen apart to get at the LED driver board
-
Hi. Strip the screen down,then check all the white links that join the LED strips together,these go high resistance.regards Earlyird.
-
Thanks earlybird ,was thinking that would be the problem as other sites have said same . Only danger seems to be its easy to crack the screen. Was hoping it may have been a fault on the power supply
-
It fairly easy to get into the screen .Lay the tv down with the screen facing towards you.Remove the casing from around the screen taking note in which order it came apart. Add wire links across the the faulty connectors then reasemble. But take extra care when fitting the screen back in making sure it is laying flat in the black plastic casing, if its not dead centre you will crack it when you tighten the cover that holds it in place. This job should only take you aout 1 hour in total. Hope this helps Earlyird.
-
Hi Earlybird ,Gave set back to customer usual story taking so long to fix but is there an LED driver board behind the screen or does the cable from the power supply that goes to a plug on the outside of the screen go directly to the screen. Just in passing I used to work for a TV company in South Africa called Earlybird
-
Hi guys ,have got another one of these Toshibas with no picture . Got given the other on to keep . Have swopped the 2 power supplies boards over and still have no picture but sound on both so dont know if both boards are faulty or if there is another fault common to both. Think this is going to be a common fault soon so would be of help if we could all get to the bottom of it . Earlybird says to strip the screen apart but dont know if the LED driver board is inside the back of the screen? Any way of checking the power supply board its a 17PW07-2
-
I have had one of these given to me with the same problem. Screen face down, remove back and screws that need to be removed to allow access to the outer clips that hold the tin shroud to the facia that houses the screen. Isolate the boards so that they can be taken off as a unit still fixed to the "shroud" when the clips are freed. There is a panel at the bottom of the screen that you must also carefully release, I think three ribbon cables. When everything is clear, carefully undo the clips to release the shroud together with the couple of panels that are fixed to it. Now turn over and reveal the LED set up. By looking carefully you may find one or more with black burn marks, if not you can isolate each row of LED's and supply 20v to 30v to each. On mine, three of the strips lit up and brightened with increased voltage. The other two strips never budged. This all went on a few weeks back so make sure you go about it, giving the screen due care. I haven't got round to replacement yet. Good luck, Henry.
-
Hi grandad ,have stripped the screen out and got down to the backlight section . There are 5 strips and the LED driver board is inside the screen thats why you cant see it when you take the back off. Have taken the driver board out . There is a fuse but its OK and its getting the 24 volts from the power supply . Have got 2 sets the same .Have swopped boards over and it makes no diff ,so have either got identical board faults or screens are faulty
-
When I got to where you are, I removed the connecting board then supplied 24v to each LED strip individually and this revealed the problem. Strips A and B did not light, strips C,D and E did and went brighter as I upped the voltage to 30v. A visual inspection revealed black burn marks on one of the individual LEDs on strip A. I must get round to finishing the job. Good luck, Henry.
-
Thanks Henry, will have a go and see what happens. Read the strips are glued in and break if you try to take them out
-
Kenny. These strips use double sided tape and are marked ABCD and E. I removed the top joining panel and on panel A, I soldered two wires to where the plug is mounted and applied 20v. As I said, check the five of them and replace the strips that do not light. Henry.
-
How did you get on with the Toshiba eventually Henry.
-
Hi Henry ,customer bought a new TV so they are just sitting in a corner . Am just going to wait till I get a working TV then I can swop the boards and check them before I start with the stripes on the screen . Thanks for your help anyway . Will let you know what happens when I get another TV and check it out
-
Kenny, I cannot get these strips any where, nobody cares. I have done a "bodge" job on another TV and
cut 2 LEDs off a spare strip I had and changed them with the faulty ones on the other TV. That TV is now working fine but I can't leave it like that. But it has proved the point for me. Will post if I ever find any.
-
Grandad it seems the way things are going . If its not the power supply or bulging caps it is a new TV for people . These Toshibas were both less than 2 years old . Remember did my apprenticeship at Radio Rentals and they had an old guy who was a Radio Engineer and thought they would be obsolete soon . Now the wheel has come full circle and we are going to be obsolete
-
I have had two of these in recently with intermittent or no backlight and in both cases it was one of the centre connectors that connect the led strips,if you take care when dismantling and look closely at print you can see it is burnt ,I just handwired two small links to cure the problem.
-
2 hrs of my life I wont get back. About half the strips werent lighting when I stripped it down and then I managed to break 1 trying to remove it. Whats the point of screwing the strips in then glueing/taping them as well. Lucky the customer had scrapped it but told me to experiment on it. I wont try another one :96: :33:
OK wee update on this saga. As it was stripped down anyway prised off the rest of the strips and applied voltage to them. Seems to me all the doubled ended strips are faulty and there are 4 different types, A B C & D so before removing them, check what plugs where. Makes replacing the faulty ones more difficult if youre cannibalising. Ive got another one to do so I'll be able to see if its the same strips that go faulty. I also had a faulty link..mebbe thats what kills the strips in the first place.