Dead Olevia 265TFHD-T11

[budm]

Re: Dead Olevia 265TFHD-T11

From the pictures, it has two identical power supply modules, each module supplies the 24V to 3 inverter boards. So do you get 22.7v on the output of BOTH power supplies?

[tom66]

Re: Dead Olevia 265TFHD-T11

22.7V is low for a 24V line. It may be enough to keep the inverters off. If you disconnect the inverters, does the 22.7V rise closer to 24V?

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

Please see the attached files.

[budm]

Re: Dead Olevia 265TFHD-T11

Can we see the pictures of the whole back side of the TV? I would like to see how the two connectors with white wires on the inverter board are connected to, and any labeling on those two connectors.
Also good clear pictures of the inverter boards.

[tom66]

Re: Dead Olevia 265TFHD-T11

It would appear the inverters do not use those control signals and they may well go through the T-con board.

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

Can you show a detailed look around the 24V connectors going to the inverter? Is there any place for inverters with 24V and VBRI/VBL/VLAMP etc., but it is not used?

I took some pictures. Please see the attached file.

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

So per information provided by LBH in the adjacent Olevia thread the lack of any voltage on the three mystery wires Pin 10 (YEL/VBRI), Pin 11 (BLU/VBL) and Pin 12 (WHT/VLAMP) appears to be normal.

OTOH per information provided by mcross in yet another adjacent Olevia thread Pin 11 (BLU/VBL) shows 2.3v. His is a different TV, so it might be some other pin number on his main board, but his power supply is identical to mine.

Now I am completely lost.

[tom66]

Re: Dead Olevia 265TFHD-T11

I for one am enjoying the annual 3 days of sunny weather.

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

Been to London many times but never ventured further North than Stratford-upon-Avon (to see Much Ado About Nothing) in THE place to see it. Whenever I went to the UK the weather always was dry and sunny believe it or not.

[tom66]

Re: Dead Olevia 265TFHD-T11

I have almost finished my first year, just a week left. Nice and sunny in Leeds at present.

The limit on editing is 90 minutes after posting.

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

I'll try to take a few pictures Tuesday. Also the more I think about it the more I suspect the Main PCB to be the culprit. Weather.com predicts a nice partly cloudy day with 25°C for Tuesday in Philadelphia. I'll remove the Main PCB (and the T-Con PCB for a good measure), take them outside and shoot a few high resolution pictures.

Have a great weekend, tom66! Thanks for your help and best of luck to you in your studies. See you here in a couple of days.

P.S. BTW, is there a statue of limitation of some sort on editing one's own posts? I amended the MainPCB.pdf file and wanted to replace the one a few posts above but the system no longer allows me to do so. I am attaching this amended file to this message. Just didn't want to multiply entities thus creating unnecessary clutter.

[tom66]

Re: Dead Olevia 265TFHD-T11

Can you show a detailed look around the 24V connectors going to the inverter? Is there any place for inverters with 24V and VBRI/VBL/VLAMP etc., but it is not used?

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

Oh yeah, I vividly remember how in university years I managed to go on for months without getting a good night sleep. Still, I really appreciate you doing this for me.

Yes indeed this TV set has two identical PSUs. I have attached a file showing both.

[tom66]

Re: Dead Olevia 265TFHD-T11

I am a student; there is no "bed time" in between the golden ages of 18 to 22.

Can you show me a picture of where the power connectors actually go out to the inverter as well? I am thinking that those lines there are a relic for smaller screen sizes where the control signals are routed through the PSU to the inverter to reduce wiring clutter. Does this TV use one power supply, or multiple? Older Olevia 65" had two power supplies in them.

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

OK, I will shoot a T-Con picture after the long weekend (it's the Memorial Day weekend here in the States). The TV is at my friend's house. I'll grab the wife's DSLR and crank up the ISO as much as I can - perhaps I'll be able to produce a better picture.

If the good PCB on another forum were in Stanby mode, then why there's +4.2v present on the PSON pin in the PSU? I have attached a better picture of the PSU with my commentaries.

Oh, and thank you for bearing with me so far tom66. It's way past midnight in the UK and I am hoping that I am not the reason why you're still up this late.

[tom66]

Re: Dead Olevia 265TFHD-T11

OK, the layout makes more sense to me. Sharp made the panel in this TV. They are quite the leader in massive LCD tech. Anyway, can we have a picture of the T-con? I'm thinking that there may be a fault there.

As to why the diagram of a good motherboard does not show voltages on those pins, perhaps it was in standby at the time?

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

I have attached a .pdf file with a picture of my Main PCB with commentaries but like I said, the quality is horrible.

[tom66]

Re: Dead Olevia 265TFHD-T11

Can we see some pictures of your boards?

Using external pictures is OK, but we prefer to see your own, because there can be minor changes that make a big difference, and sometimes there can be obvious failures that we can spot, but that you would not necessarily have noticed.

[HAHOMETP]

Re: Dead Olevia 265TFHD-T11

Thanks for the reply, tom66. Yes, that is correct. Each of my inverter boards only have 24V in from the PSUs.

You have reinforced my suspicion that T-Con is somehow involved in turning the inverters on. I read about this before, just never encountered this design in real life.

Also, yet another mystery lies in the PSUs. All pins in all connectors produce voltages consistent with their silksreen labeling except for the following 3 in the attached picture:
VLAMP (feedback from the CCFLs?)
VBL (voltage to the inverters?)
VBRI (brightness control?)

They show no voltage whatsoever regardless whether the TV is ON or OFF.

This TV has two identical PSUs. One has wires connecting the above pins to the CN2 on the Main PCB:
Pin 10 => YEL - VBRI
Pin 11 => BLU - VBL
Pin 12 => WHT - VLAMP

The second one does not. Neither PSU shows any voltage on either of these three pins regardless whether the TV is ON or OFF. Swapping the PSUs did not change a thing.

What mystifies me further still is that this picture of a good motherboard also shows that these three pins do not carry any voltage. So why were they put there with such descriptive silkscreen labels in the first place if they do not have any function?

[tom66]

Re: Dead Olevia 265TFHD-T11

Do each of your inverter boards only have 24V in from the main board? No control signals like BLON? Some T-con boards have synchronisation signals which keep the inverter in step with the T-con. The idea is to limit apparent flicker and improve apparent motion response by blinking the backlight between frames.