TOSHIBA 40L1333B NO PICTURE BUT GOT SOUND

[kennyc]

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

[jordan]

17PW07-2

[kennyc]

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

[EARLYBIRD]

Hi. Strip the screen down,then check all the white links that join the LED strips together,these go high resistance.regards Earlyird.

[kennyc]

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

[EARLYBIRD]

 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.

[kennyc]

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

[kennyc]

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

[grandad h]

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.

[kennyc]

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

[grandad h]

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.

[kennyc]

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

[grandad h]

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.

[grandad h]

How did you get on with the Toshiba eventually  Henry.

[kennyc]

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