Toshiba regza 52" sound no picture

[Dan Surra]

Re: Toshiba regza 52" sound no picture

It clicks when you turn it on and off. Yellow light flashes during initial power up and then a steady green light is on at base of TV. That is basically the same as it was when it was working, Packard

[Dan Surra]

Re: Toshiba regza 52" sound no picture

Service manual.
Check those Voltages when TV is off and when the power switch is activated.

Thanks, Bud this is very helpful

[Dan Surra]

Re: Toshiba regza 52" sound no picture

Ok, I did the diagnostic work recommended. All 5 Inverter supply pins read a healthy 24.3 volts. These would be at P861 and P860. The next step in the flow chart is pins 1 and 2 @ P810A. They read the recommended 12 volts (12.3 actual). Flow chart says if this is the case to try one or both of the CCF inverters. If that does not help replace the LCD display.
I don't even know what or where the inverters are. Any suggestions as to how to proceed? Will post close up pics of boards in next post. Thanks in advance. Dan

[Dan Surra]

Re: Toshiba regza 52" sound no picture

[vinceroger69]

Re: Toshiba regza 52" sound no picture

in post 12 on the left and right hand of the tv you can see the invertor transformers (6 on each side) on pcbs is there a number printed on them? these boards also sometimes have fuses on them so worth checking there ok.

[Diah]

Re: Toshiba regza 52" sound no picture

sorry to all who post answer here .. OP rubbished your TV and got other.. the repair coast will be round half price if you got other TV in case you succeed ... look all run away to guide you. except vinceroger69

[martino]

Re: Toshiba regza 52" sound no picture

sorry to all who post answer here .. OP rubbished your TV and got other.. the repair coast will be round half price if you got other TV in case you succeed ... look all run away to guide you. except vinceroger69

If only you would run away,sigh

[budm]

Re: Toshiba regza 52" sound no picture

So you have 24V supply for the inverter board, but do you have BL-ON to turn on the inverter board.
See page 3 of the PDF, look at CN61 pin 1 for the BL-ON signal ,and other Voltages as well on that connector.

[Dan Surra]

Re: Toshiba regza 52" sound no picture

in post 12 on the left and right hand of the tv you can see the invertor transformers (6 on each side) on pcbs is there a number printed on them? these boards also sometimes have fuses on them so worth checking there ok.

transformer #'s are 0095AD U00815 CY on left side looking from rear and 0095AD U00818 CY on right.
if fuses are labeled F400 and F401 on board, they are good.

[Dan Surra]

Re: Toshiba regza 52" sound no picture

sorry to all who post answer here .. OP rubbished your TV and got other.. the repair coast will be round half price if you got other TV in case you succeed ... look all run away to guide you. except vinceroger69

Diah, what do you mean OP rubbished my TV? What is OP? Please explain. Finally, I really do appreciate all the helpful insight from others on this post. Thanks.

[Dan Surra]

Re: Toshiba regza 52" sound no picture

So you have 24V supply for the inverter board, but do you have BL-ON to turn on the inverter board.
See page 3 of the PDF, look at CN61 pin 1 for the BL-ON signal ,and other Voltages as well on that connector.

Well, that is the next step I guess. I may not be able to get at this for a day or so. Be patient with me and again, Bud, thank you for your advice. Dan

[Dan Surra]

Re: Toshiba regza 52" sound no picture

OK, was able to get some readings on the BL-ON CN61 connector today. They are as follows, pin 1 BL ON actual 3.26v (listed to be 5v), pin 2 empty, pin 3 empty, pin 4 VBR actual 3.28v (0-3.3v listed), pin 5 BL Det actual 3.25 (none listed), pin 6 continuity to ground, pin 7 empty. These were taken with the unit turned on.
Thanks in advance.

[budm]

Re: Toshiba regza 52" sound no picture

BL-ON of 3.26VDC is fine I would think anything over 2.5Vdc will be = ON.
VBR (DIM) is also fine.
BTW, do you see any blinking LED ERROR codes? Look at the PDF for error codes listing.

[Dan Surra]

Re: Toshiba regza 52" sound no picture

It blinks three times, twice (yellow) when first powering up and then goes to a solid green. I believe it always did this when turning the set on. Hope this helps, Bud. You've been a great help Bud. Any suggestions as to what else I can check?

[Dan Surra]

Re: Toshiba regza 52" sound no picture

Ok, I have 24v at all inverter board terminals and 3.26v at BL-ON terminal. Where do I go from here? From standpoint of a novice, I have received some great advice on here. Hope we can figure out what is causing sound and no pic issue. I hate to trash the unit.

[vinceroger69]

Re: Toshiba regza 52" sound no picture

i wonder if it could be a faulty inverter transformer it only takes one to be bad maybe budm has a idea if this could cause the issues your having as you do seem to have all the correct voltages.

[Dan Surra]

Re: Toshiba regza 52" sound no picture

I have NO clue vinceroger, LOL. Is there a board that we could try and replace that doesn't cost more than the unit is worth?

[vinceroger69]

Re: Toshiba regza 52" sound no picture

i would wait for budms input etc as it uses ccfl tubes maybe one has gone faulty i would expect the screen to flash quick though with the 2 seconds to black fault have you tried in a really dark room and powering up the tv do you get any flash on the screen?

[vinceroger69]

Re: Toshiba regza 52" sound no picture

budm had two really good threads but i dont know if these tests will work on your boards as im not sure if invertor ccfl fault any your set has invertors on the left and right of the set so not sure how to carry out the tests im sure budm will advise.
https://www.badcaps.net/forum/showth...x+dx-40l261a12
https://www.badcaps.net/forum/showth...er+testing+cfl

[budm]

Re: Toshiba regza 52" sound no picture

Since you do have all the required Voltages and the command signal (it is still questionas to if the BL-ON should really be truly 5VDC or not), and Vince suggested, I would look at the TV in really dark room to see if the backlights even flash on for second or not.
Bad lamp/lamps/transformer will not stop the inverter circuit to fire up the lamps to start first, if it detects the problem int he first 3 seconds then the circuit will go into protection shutdown.