Toshiba 46xV645U Blinking Orange Light

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

Yes, although I don' think a resistor is required, The Q333 is just a driver for the optocoupler.
Remember I don't have your board, I only have a picture of the board from Shopjimmy, location numbers may be slightly different.

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

I would think the 3.3 should stay up when it is connected back to the power supply, maybe follow that line to make sure nothing is shorted and loading it down.
Its also possible that with the pin2 wire removed from the power supply that 3.3 from the main is'nt supplying the current to turn the power suppply on?
It could also be that the power supply is holding that line low for some reason, but I don't think so.
I followed pin2 of PJ91 to jp061 (R8168 on trace side) then to JP069 which seems to connect to Q8160 (in that area) and also to R8323 then to Q333 that turns on Q832 (white) optocoupler
Try applying 3 volts to the power supply pin 2 via a few hundred ohm resistor to see if the power supply comes on?

Here is a video of me probing around that area, i couldnt find Q333 though i did find Q8333.

https://youtu.be/-DIRqGh9vVk



any testing tips are appreciated,

When you say apply 3 volts to the power supply pin 2 via a few hundred ohm resistor, does that mean place a few ohm transistor in series into pin to on the power supply?

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

I would think the 3.3 should stay up when it is connected back to the power supply, maybe follow that line to make sure nothing is shorted and loading it down.
Its also possible that with the pin2 wire removed from the power supply that 3.3 from the main is'nt supplying the current to turn the power suppply on?
It could also be that the power supply is holding that line low for some reason, but I don't think so.
I followed pin2 of PJ91 to jp061 (R8168 on trace side) then to JP069 which seems to connect to Q8160 (in that area) and also to R8323 then to Q333 that turns on Q832 (white) optocoupler
Try applying 3 volts to the power supply pin 2 via a few hundred ohm resistor to see if the power supply comes on?

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

what is the voltage on D820 negative to fuse 820 when the wire is removed, does it go above 176 volts/
also what is the voltage on pin 2 when it is connected to the power board, is it still 3.3 volts?

The voltage accross d820 to fuse 820 while pin 2 is disconnected is 176V

Reconnected pin 2 measures 0v

https://youtu.be/EaqJdd-npKo

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

what is the voltage on D820 negative to fuse 820 when the wire is removed, does it go above 176 volts/
also what is the voltage on pin 2 when it is connected to the power board, is it still 3.3 volts?

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

I can't say for sure, but it looks like you need the Pow-sig PJ91 from the main board to turn on the power supply, what voltage do you get on that pin?

voltage on pin 2 (POW_SIG) was a steady ~3.3v

https://youtu.be/zvFw8T69o-4

Interestingly the toshibas logo lit up and i could hear sound while having pin 2 disconnected, the standby light was continuously blinking orange light

replacing pin 2 has the auto shutting off, 3 blinking green lights, no lit up toshiba logo

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

I can't say for sure, but it looks like you need the Pow-sig PJ91 from the main board to turn on the power supply, what voltage do you get on that pin?

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

What is the DC voltage across D820 Bridge rectifier? If you have around 160V, leave black probe on (-) of bridge and check the voltage on F820 (glass fuse next to caution live area)
Using chassis as ground, do you have any voltage on jp016 (Next to c846)
Here is the schematic for the PE0620, some parts are very close, like the pfc circuit

Across D820 measured 176V
D820 negative to fuse 820 measured 176V
JP016 Measured 5v

https://youtu.be/TdYe383DqBc

thanks for the schematics!

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

What is the DC voltage across D820 Bridge rectifier? If you have around 160V, leave black probe on (-) of bridge and check the voltage on F820 (glass fuse next to caution live area)
Using chassis as ground, do you have any voltage on jp016 (Next to c846)
Here is the schematic for the PE0620, some parts are very close, like the pfc circuit

[budm]

Re: Toshiba 46xV645U Blinking Orange Light

I just point that out for the S-24 which I did not look at his board in details to see if the S-24 section is stuffed with parts or not, and yes he is still having problem with the 24V for running the inverter board which is another section of the power supply.

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

THIS POWER SUPPLY BOARD IS USED FOR MANY DIFFERENT MODELS. MANY PARTS ARE NOT INSTALLED ON THIS BOARD INCLUDING : F897, D897, L897 ETC.
The 24volts that this tv needs comes from p860/861 NOT pj90 s-24v

[budm]

Re: Toshiba 46xV645U Blinking Orange Light

https://www.badcaps.net/forum/attach...3&d=1512430752
OK, I just trace out the circuit on the bottom side of the board based on the picture provided by RJ.
The power transformer T880 is used for generating the 18V (Diode D895), 12V (D890, 891), and the S_24V (D8970).
Fuse F895 is for the 18V supply which you are getting 24VDC (which is still in question if the meter is correct or not).
Fuse F897 is for the S_24V which you are not getting the S_24 but we know the Transformer is OK because you are getting the 12V and the 18V, so you better find out if FUSE F897 is good or not for sure, or D8970 is bad or not.

[R_J]

Re: Toshiba 46xV645U Blinking Orange Light

I suspect the audio 18v is high because there is no load (audio output not working as set is not on) It comes from the same transformer as the 12 volts and it is ok

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

So those are the Voltage readings from the replacement board?
You are still not getting the 24V same as your old board.
Are you sure the 18V is really 27.5V?

I'm sorry i forgot to mention: i ended up scrapping the replacement board for components(seller refunded me and was cool), the board im referring to now is the original problem board.

the jumper i measured in the video is also connected directly to pins 3 and 4

here are the original readings

Thank you for the reply

Here are those measurements

1 - GND AUD - 0V - 0V
2 - GND AUD - 0V - 0V
3 - 18V AUDIO - 0V - 24V
4 - 18V AUDIO - 0V - 24V
5 - S_24V - 0V - 0V
6 - GND - 0V - 0V
7 - POW_TV - 0V - 3.3V
8 - GND - 0V - 0V
9 - 12V - 0V - 12V
10 - 12V - 0V - 12V
11 - 12V - 0V - 12V
12 - GND - 0V - 0V
13 - 5V1 - 5.1V - 5.1V
14 - GND - 0V - 0V

and here are my new readings

UPDATE

I found a smb resister to be open and 2 shorted transistors on the powerboard, after replacing the parts the tv now gives me 3 GREEN blinking lights instead of the continuous orange blinking light

while the mainboard and psu are connected, the unit cycles power after 30 every seconds.

here is a video
https://www.youtube.com/watch?v=tCZ4SP3DDqw&

please let me know if i can provide more information/perform new tests

Connector PJ90 (psu to main)Standby V and Powered On V are:

1 - GND AUD - 0V - 0V
2 - GND AUD - 0V - 0V
3 - 18V AUDIO - 0V - 27.5V
4 - 18V AUDIO - 0V - 27.5V
5 - S_24V - 0V - 0V
6 - GND - 0V - 0V
7 - POW_TV - 0V - 3.3V
8 - GND - 0V - 0V
9 - 12V - 0V - 12V
10 - 12V - 0V - 12V
11 - 12V - 0V - 12V
12 - GND - 0V - 0V
13 - 5V1 - 5.1V - 5.1V
14 - GND - 0V - 0V

[budm]

Re: Toshiba 46xV645U Blinking Orange Light

UPDATE

I found a smb resister to be open and 2 shorted transistors on the powerboard, after replacing the parts the tv now gives me 3 GREEN blinking lights instead of the continuous orange blinking light

while the mainboard and psu are connected, the unit cycles power after 30 every seconds.

here is a video
https://www.youtube.com/watch?v=tCZ4SP3DDqw&

please let me know if i can provide more information/perform new tests

Connector PJ90 (psu to main)Standby V and Powered On V are:

1 - GND AUD - 0V - 0V
2 - GND AUD - 0V - 0V
3 - 18V AUDIO - 0V - 27.5V
4 - 18V AUDIO - 0V - 27.5V
5 - S_24V - 0V - 0V
6 - GND - 0V - 0V
7 - POW_TV - 0V - 3.3V
8 - GND - 0V - 0V
9 - 12V - 0V - 12V
10 - 12V - 0V - 12V
11 - 12V - 0V - 12V
12 - GND - 0V - 0V
13 - 5V1 - 5.1V - 5.1V
14 - GND - 0V - 0V

So those are the Voltage readings from the replacement board?
You are still not getting the 24V same as your old board.
Are you sure the 18V is really 27.5V?

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

bump

im devoted to figuring this out and will gladly share what i find. im eager to learn

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

UPDATE

I found a smb resister to be open and 2 shorted transistors on the powerboard, after replacing the parts the tv now gives me 3 GREEN blinking lights instead of the continuous orange blinking light

while the mainboard and psu are connected, the unit cycles power after 30 every seconds.

here is a video
https://www.youtube.com/watch?v=tCZ4SP3DDqw&

please let me know if i can provide more information/perform new tests

Connector PJ90 (psu to main)Standby V and Powered On V are:

1 - GND AUD - 0V - 0V
2 - GND AUD - 0V - 0V
3 - 18V AUDIO - 0V - 27.5V
4 - 18V AUDIO - 0V - 27.5V
5 - S_24V - 0V - 0V
6 - GND - 0V - 0V
7 - POW_TV - 0V - 3.3V
8 - GND - 0V - 0V
9 - 12V - 0V - 12V
10 - 12V - 0V - 12V
11 - 12V - 0V - 12V
12 - GND - 0V - 0V
13 - 5V1 - 5.1V - 5.1V
14 - GND - 0V - 0V

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

UPDATE

I removed a few transisters and found Q820 was open and Q860, Q861 were shorted, due to my current learning curve, i discontinued testing and i went ahead and ordered a used psu

When I installed the new psu it now fails to power on (no standby light)... possible doa part but its the only one i have now.

New PSU readings

1 - GND AUD - 0V
2 - GND AUD - 0V
3 - 18V AUDIO - 0V
4 - 18V AUDIO - 0V
5 - S_24V - 0V
6 - GND - 0V
7 - POW_TV - 0V
8 - GND - 0V
9 - 12V - 0V
10 - 12V - 0V
11 - 12V - 0V
12 - GND - 0V
13 - 5V1 - 4.85V (it jumps between .5-3.9v when connector is attached to mainboard)
14 - GND - 0V


supplying 3.3v onto pin 7 on psu (pow_tv) causes a relay to click on and off continuosly

[budm]

Re: Toshiba 46xV645U Blinking Orange Light

At this point you do not have the switched 24VDC to run the Inverter boards, so you will need to troubleshoot the 24V section and find out why, I do not have the diagram for the board so you will have to manually trace out circuit, or look into repair kit to see if it will solve the problem otherwise it will be time consuming process to locate down to component level without the diaagram.

[doesntmind]

Re: Toshiba 46xV645U Blinking Orange Light

I tested the two backlight connectors on the power board and read 3.38V where it's marked as 24vinv