No Backlight on Toshiba 32HL67U

[Misterkeeks]

The other day while the TV was on, it made a noise and the picture disappeared. Sound still works fine. I investigated further today and it looks like the TV works, it just doesn't have a backlight. It seems as though this could either be an inverter board issue or something with the backlight on the panel itself. I'm thinking about buying an inverter board and seeing what happens when I replace it.

Does anyone know how to replace the inverter board on these, or have a service manual? Any other advice?

Thanks!

[Diah]

Re: No Backlight on Toshiba 32HL67U

Tow things you need to do before you go to buy any replacement

1- did you try with torch light to see if there picture on screen to see while sound can hear ?

2- post photo on whole boards of your Tv back to see how they are connected to each other

[dick_barton]

Re: No Backlight on Toshiba 32HL67U

Download the service manual

http://elektrotanya.com/toshiba_32hl.../download.html

[Andrew F. Ali]

Re: No Backlight on Toshiba 32HL67U

Download the service manual

http://elektrotanya.com/toshiba_32hl.../download.html

Site says file corrupted........Could you please upload the file for us????

[Misterkeeks]

Re: No Backlight on Toshiba 32HL67U

Tow things you need to do before you go to buy any replacement

1- did you try with torch light to see if there picture on screen to see while sound can hear ?

2- post photo on whole boards of your Tv back to see how they are connected to each other

TV works (tried with a flashlight, can make out the screen being on), but there is no backlight.

I will try and take a picture of the TV sometime soon.

Download the service manual

http://elektrotanya.com/toshiba_32hl.../download.html

Thanks. Too bad that it isn't in PDF form, it will be a pain to get this Zeus stuff working...

Site says file corrupted........Could you please upload the file for us????

The file isn't corrupted, there is just no preview because it is not a PDF file. To download, scroll down past the preview window and click on the download link- I have attached a picture for you.

[mmartell]

Re: No Backlight on Toshiba 32HL67U

Yes, more than likely you need a new inverter (or repair the one you have).

Check all fuses on the inverter, I bet one is open.

[dick_barton]

Re: No Backlight on Toshiba 32HL67U

Site says file corrupted........Could you please upload the file for us????

It is a zip file and not a pdf file which is why it says may be a corrupted pdf file.

[vinceroger69]

Re: No Backlight on Toshiba 32HL67U

yes the files are ok once unzipped but you will need the ZEUS ENGINE software on your pc
http://elektrotanya.com/toshiba_zeus.../download.html

[dick_barton]

Re: No Backlight on Toshiba 32HL67U

yes the files are ok once unzipped but you will need the ZEUS ENGINE software on your pc
http://elektrotanya.com/toshiba_zeus.../download.html

Thanks. I only took a quick peek at it but did not attempt to download.

[vinceroger69]

Re: No Backlight on Toshiba 32HL67U

ive never had much luck in getting zeus to work i think budm has has this issue in the past too with this toshiba software.

[dick_barton]

Re: No Backlight on Toshiba 32HL67U

Best to start without the manual and follow Diah suggestion in the earlier post.

Edit
Is there any blinking led sequence or just sound and no backlights

[budm]

Re: No Backlight on Toshiba 32HL67U

Is this your inverter board?
http://www.shopjimmy.com/samsung-inv...t-inverter.htm
Samsung INVST320T (HS320WK12) Backlight Inverter

The service manual does not have any info for the Inverter board.
What Voltage testing, fuses testing, etc have you done so far?

Picture provided by shopjimmy.
BTW, I installed ZEUS and the necessary files from AUTODESK, AKAMAI on my old XP machine to be able to view the service manual.

[Misterkeeks]

Re: No Backlight on Toshiba 32HL67U

Finally was able to open the tv and test voltages. Here is an overview picture of the boards.



And a better overview:


I started testing with the leftmost connector located on the top orange board (the cables, not the metal part connecting boards). Here's a picture of the orange board itself:



And here is the connector itself.



Here are the voltages on the connector:
VCC_LCD....5.1V on, 0 off
VCC_LCD....5.1V on, 0 off
3.3VD2.......3.41V on, 0 off
3.3VD2.......3.41V on, 0 off
3.3VD1.......3.41V on, 0 off

and on the next connector:

VCC_DDR....3.41V on, 0 off
6VD............6.39Von, 0 off
18VD..........19.61V on, 0 off

These are the next connectors. They are located vertically on the rightmost side:


18V............19.61V on, 17.97 off
40V............44.9V on, 42.4 off
Audio_VCC..28.7V on, 0 off
Power_SIG..3.28V on, 0 off
5V..............4.91V on, 5.00 off

24V_INV......23.9V on, 0 off
6V..............6.43V on, 6.46 off
12V.............11.87V on, 12.17 off


On the inverter, I only tested the VCC pins. They were all 23.9 volts

Is this your inverter board?
http://www.shopjimmy.com/samsung-inv...t-inverter.htm
Samsung INVST320T (HS320WK12) Backlight Inverter

The service manual does not have any info for the Inverter board.
What Voltage testing, fuses testing, etc have you done so far?

Picture provided by shopjimmy.
BTW, I installed ZEUS and the necessary files from AUTODESK, AKAMAI on my old XP machine to be able to view the service manual.

That appears to be my inverter. I put all of my voltage info above.

Best to start without the manual and follow Diah suggestion in the earlier post.

Edit
Is there any blinking led sequence or just sound and no backlights

It behaves just like normal, except this is not backlit.

Yes, more than likely you need a new inverter (or repair the one you have).

Check all fuses on the inverter, I bet one is open.

I briefly looked at it and only saw one fuse, that had no resistance, so I assume it is good.

[budm]

Re: No Backlight on Toshiba 32HL67U

'I briefly looked at it and only saw one fuse, that had no resistance, so I assume it is good.'
Do you mean the resistance shows <1 Ohm, right?
You should have 24VDC at both ends of the fuse with ref. to the chassis if the fuse is good.

https://www.badcaps.net/forum/attach...8&d=1471577178
What DCV do you have on pin 12: ENA (same as BL-ON), and pin 13: DIM?

[Misterkeeks]

Re: No Backlight on Toshiba 32HL67U

'I briefly looked at it and only saw one fuse, that had no resistance, so I assume it is good.'
Do you mean the resistance shows <1 Ohm, right?
You should have 24VDC at both ends of the fuse with ref. to the chassis if the fuse is good.

https://www.badcaps.net/forum/attach...8&d=1471577178
What DCV do you have on pin 12: ENA (same as BL-ON), and pin 13: DIM?

Fuse shows 24V (23.9V) on both sides.

Pin 12 (ENA) is 4.48V.

For kicks I tested pins 11-14
14...3.11V (EX_DIM)
13...3.36V (DIM)
12...4.48V (ENA)
11...0.01V (ERROR-OUT)

Pins 14 and 11 do not have a wire corresponding to them on the cable.

Thanks for your help!

[budm]

Re: No Backlight on Toshiba 32HL67U

OK, you have all the correct Voltage and signals for the Inverter board to function, so you need new inverter board or you can try fixing it down to component level.
It is 32" TV so it is not worth that much.

[Misterkeeks]

Re: No Backlight on Toshiba 32HL67U

OK, you have all the correct Voltage and signals for the Inverter board to function, so you need new inverter board or you can try fixing it down to component level.
It is 32" TV so it is not worth that much.

Great, thanks for the info. I purchased this used inverter board for $17.79 on ebay. Hopefully it will work, not the end of the world if it doesn't.

[budm]

Re: No Backlight on Toshiba 32HL67U

That is really good reasonable price.

[Misterkeeks]

Re: No Backlight on Toshiba 32HL67U

That is really good reasonable price.

The inverter board arrived yesterday. I installed it and everything was back to normal! Thanks so much for all of your help!

[budm]

Re: No Backlight on Toshiba 32HL67U

That is great, $18 repair works + the knowledge you gain.