toshiba 42tl515u problems

[nomoresonys]

Re: toshiba 42tl515u problems

Maybe you can test some components on the mainboard, might just be a 2 dollar part needed?

[nomoresonys]

Re: toshiba 42tl515u problems

A few repair services on ebay, they want about 100 bucks.

[doesntmind]

Re: toshiba 42tl515u problems

A few repair services on ebay, they want about 100 bucks, seems pricey.

Thank you so much for your help! Do you know where I might be able to find a service manual on this so I can get a better idea on fixing the mainboard?

[nomoresonys]

Re: toshiba 42tl515u problems

I believe the member here named nickstvs does repair service, not sure tho, you would have to check with him, if you want.

[nomoresonys]

Re: toshiba 42tl515u problems

Some use this site. https://elektrotanya.com/

[doesntmind]

Re: toshiba 42tl515u problems

Some use this site. https://elektrotanya.com/

Thank you for this resource, I wasnt able to find my boards manual but I will keep this in bookmarks.

So far I have been able to trace the BL_ONOFF to the collector pin of LY Q1001 on back side of board. Do you think I should attempt applying heat on the board for a bit in case it just needs reflow? any tips or suggestions?

[nomoresonys]

Re: toshiba 42tl515u problems

Hmmm, there looks like a lot of tiny components on the back, myself I would be worried I would lose some of them by applying too much heat, you might be right tho, not sure? there may be a way to test the components first without adding heat, to see if they are in working order.

[nomoresonys]

Re: toshiba 42tl515u problems

Might be a test procedure for LY Q1001.

[nomoresonys]

Re: toshiba 42tl515u problems

It's a transistor, you can check youtube for transistor testing, some videos are better than others of course.

[R_J]

Re: toshiba 42tl515u problems

The transistor marked LY is a 2SC2712-Y, easy to check with a meter on diode test

[budm]

Re: toshiba 42tl515u problems

Report the Voltages of all 3 pins with ref to gnd when TV is OFF and when power switch is activated.
Bur at this point you have more than just he BL-ON. Do you have PWM Dimming control signal?
Do you have 12VDC feeding the T-CON?

[doesntmind]

Re: toshiba 42tl515u problems

Report the Voltages of all 3 pins with ref to gnd when TV is OFF and when power switch is activated.
Bur at this point you have more than just he BL-ON. Do you have PWM Dimming control signal?
Do you have 12VDC feeding the T-CON?

I have 164mV at PWM pin

the emitter pin on both transisters are connected.
the base of q1001 goes to a 10k resistor then collector of q1002.
the base of q1002 goes to a 4.7k resistor then to both emitter pins.

Q1001
pin - desc - standby - reading
1 - base - 0 - 700mV
2 - emitter - 0 - 5mV
3 - collector - 0 - 24mV

Q1002
1 - base - 0 - 6.2mv
2 - emitter - 0 - 6.2mv
3 - collector - 0 - 3.2V

[doesntmind]

Re: toshiba 42tl515u problems

Report the Voltages of all 3 pins with ref to gnd when TV is OFF and when power switch is activated.
Bur at this point you have more than just he BL-ON. Do you have PWM Dimming control signal?
Do you have 12VDC feeding the T-CON?

forgot last question, i only found 3v on one pin but couldnt find 12v anywhere on tcon

[budm]

Re: toshiba 42tl515u problems

forgot last question, i only found 3v on one pin but couldnt find 12v anywhere on tcon

Did you check right at both ends of the SMD fuse on the T-CON board? You know where the fuse is, right?

[doesntmind]

Re: toshiba 42tl515u problems

Did you check right at both ends of the SMD fuse on the T-CON board? You know where the fuse is, right?

I read 300mV at both sides of fuse while system is on, 20mV when standby

[budm]

Re: toshiba 42tl515u problems

I read 300mV at both sides of fuse while system is on, 20mV when standby

You have more than just no bl-on problem, the MAIN is not sending the signal to turn on the switched MOSFET to supply the 12V to the T-CON either.
So more in-depth troubleshooting of the main board will be required, so you can spend lots of time locating the schematic of your main board and do more testing.