Toshiba 39l22u

[pr0ject]

I have a 39" Toshiba that I gave to my grandma. she called me and said there was no picture. There is a green led light on the front for power that comes on but no picture... No sound but I am not sure as I can't be sure what input or channel I am on...

I took the back panel off. I didn't find anything wrong for sure. I see the power supply available for sale but I don't think it's that because the light turns on in the front.

Any help appreciated.

[CapLeaker]

Re: Toshiba 39l22u

does the back light work? You see anything when you shine a flashlight into the screen with the TV on?

[pr0ject]

Re: Toshiba 39l22u

I tried to shine at it but didn't seen anything.

[budm]

Re: Toshiba 39l22u

It is LED backlights TV,and I beleive the LED DRIVER board may be inside the LCD panel assembly.
http://assets.shopjimmy.com/media/ca...032513-top.jpg

Report DCV reading of each pin with its name of connector P802 so we can see if it is msiing any Voltages or signals.
Check the DCV Voltage right at the two leg of the Boosted Voltage filter cap C902 (22uF 250VDC) to see if it jumps up real high and then settle down at what voltage.

[pr0ject]

Re: Toshiba 39l22u

hmmm... how sure are you? the part is 45 bucks, cheaper than me getting a new tv... http://www.shopjimmy.com/toshiba-pk1...upply-unit.htm

I just ordered a multimeter... will get back to you guys?

[budm]

Re: Toshiba 39l22u

"hmmm... how sure are you?" Sure about what. We do not have the Voltage readings for us to see yet, and we do not know if there is LED driver board inside the panel or not..
What other tools do you have? Soldering iron, SMD rework station, etc?
If you think $45 is too much to spend on 39" TV then you are better off buying a new TV then, knowledge is worth a lot more than $45.

[pr0ject]

Re: Toshiba 39l22u

couldn't find the multimeter just ordered one... I have a soldering iron... well report back after I get some readings...

[pr0ject]

Re: Toshiba 39l22u

p802 voltages top to bottom.

BLON .01
DIM .33
ACD 3.55
PWON 3.31
5Vcc 5.05
5Vcc 5.05
5Vcc 5.05
12Vcc .01-.02
12Vcc .01-.02
GND 0
GND 0
GND 0
12Va .01-.02
GND 0
GND 0

Turned TV on and turned lights off used flash light on screen didn't see anything...

[CapLeaker]

Re: Toshiba 39l22u

Yeah... your 12V isn't there, also the BLon (backlight) is off too.
Unhook the main board, take a 1k ohm resistor and jumper 5V to PWon. take another 1k ohm resistor and jumper 5V to BLon. This forces the PSU on and the backlight should be on. Redo the measurement of all these pins.

[budm]

Re: Toshiba 39l22u

"p802 voltages top to bottom.

BLON .01: Bad Backlights ON signal, not getting signal from the main board
DIM .33
ACD 3.55: OK, Analog dimming control signal from the main board
PWON 3.31" OK, Power supply on (same as PS-ON) signal from main board.
5Vcc 5.05 OK
5Vcc 5.05 OK
5Vcc 5.05 OK
12Vcc .01-.02: Bad, 12V for sound and T-CON.
12Vcc .01-.02:Same as above
GND 0
GND 0
GND 0
12Va .01-.02: Bad.
GND 0
GND 0"

So you have two problem, main board is not sending BL-ON, and power supply is not sending 12V even though the PS-ON is present.

More in-depth troubleshooting required.

[CapLeaker]

Re: Toshiba 39l22u

double

[budm]

Re: Toshiba 39l22u

hmmm... how sure are you? the part is 45 bucks, cheaper than me getting a new tv... http://www.shopjimmy.com/toshiba-pk1...upply-unit.htm

I just ordered a multimeter... will get back to you guys?

By the way, the one in your link does not match your power supply board which looks like it is made by FSP.

[budm]

Re: Toshiba 39l22u

I need to verify the version of the board you have, looking at your pictures and the SJ pictures, it looks this is the board you have in your TV, please verify:
http://www.shopjimmy.com/toshiba-750...pply-unit.htm#

[pr0ject]

Re: Toshiba 39l22u

The board states FSP121-3fs02 so I guess it is the FSP one... I don't have any ohm resistors but do you think if I swapped the power supply it would work assuming I could find a board?

http://www.tristatemodule.com/p-2731...02-39l22u.aspx

[budm]

Re: Toshiba 39l22u

BTW: "ACD 3.55: OK, Analog dimming control signal from the main board" It is AC Detect, not 100% sure if normally HIGH = GOOD or = BAD.
All I know right now is that you do not have any 12V outputs or LED drive Voltage, so you can try new power supply board or try to find out why 12V and the LED drive Voltage are not present.
Those Voltages are generated by power transformer T101 driven by MOSFETs Q101, Q102.

[CapLeaker]

Re: Toshiba 39l22u

The board states FSP121-3fs02 so I guess it is the FSP one... I don't have any ohm resistors but do you think if I swapped the power supply it would work assuming I could find a board?

http://www.tristatemodule.com/p-2731...02-39l22u.aspx

I would only be convinced of that, after forcing the PSU on, but that is just me. At least check between 12V and GND on the main board for short. I doubt it, but it doesn't hurt to check. Other than that, we could ass/u/me that if you swapped the PSU that it should work, providing that nothing is bad on the main board.

[pr0ject]

Re: Toshiba 39l22u

I ordered some resistors finally got a chance to mess with this tv again. Any advice appreciated.

After I jumpered with the resistors...

BLON 1
DIM .338
ACD 1
PWON 1
5Vcc 1
5Vcc 1
5Vcc 1
12Vcc .21
12Vcc .21
GND 0
GND 0
GND 0
12Va .21
GND 0
GND 0

[budm]

Re: Toshiba 39l22u

What are those readings with 1's? Volts? Ohms? You were getting 5V on 5VCC before.

[pr0ject]

Re: Toshiba 39l22u

What are those readings with 1's? Volts? Ohms? You were getting 5V on 5VCC before.

Strange. Anyways I tried again and the measurements came back the same as the first time...


Now just to be clear on how to jumper stuff. I am a noob by the way.

I took the cable from the main board and use the resistors to stick in the ports. I also tried to connect the hard wires on the p802 side. Anyways no additional reaction from the tv.

[pr0ject]

Re: Toshiba 39l22u

I bought the Power Supply. Hopefully it'll work.