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Old 04-03-2022, 01:08 PM   #341
Ancient1
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

lotas : I have "Transistor like", TO-92, AZ431. I got the PDF now.

Davi.P
1. I can replace , as I bought 2. But Vcc is now fine, last time I checked.
2. What do you want me to do with U2
3. " I see QF1/2 , it's not clear," = you made a mistake ? or .. where are they
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Old 04-03-2022, 01:44 PM   #342
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

1. can you answer about plastic bag?
2.to replace it, but i would put attention first on the ic2
3. I mean the 2 mosfets on the large heatsink on the left on the previous photo top/bottom view, towards the ac input..
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Old 04-04-2022, 02:34 AM   #343
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

I received new 2xIC2 in anon plastic bag.

I attach a previous Photo of QF1 QF2 as a reminder: you saw correctly

OK. So this is the plan :

Measure V : IC2 and U2 and AZ431
Measure Hz : QF1 QF2 Gate . and AZ431 too ( Cathode Anode Vref )?

I will post results before I replace U2 and IC2 ( with the 2nd one I got )
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Old 04-04-2022, 05:41 AM   #344
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

No,some corrections:
1-Measure V on ic2 / u2 is not useful, you have already seen V on ic2 is ok, on u2 you can apply 1,2v on the secondary side and watch if primary side conducts between 2 pins
2-Measure hz on AZ431 has no sense
3-replacing ic2 from the same lot has no sense, i suspect both are fake, better to buy from your country from big supplier, in my country there are 4-5 big ones like farnell, RS, Distrelec, Mouser..
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Old 04-04-2022, 01:59 PM   #345
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Its isn't simple to buy from Mouser here, the importer require minimum of ~$15. I will try and find..
Do you think there is a way to test IC2 if it is OK ?

OK. The store I got the 3x 0.22 Ohm doesn't have. I see 5x on eBay for $6. But I'll replace first, thats why I bought 2 in the first place.

Last edited by Ancient1; 04-04-2022 at 02:08 PM..
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Old 04-04-2022, 02:10 PM   #346
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

I have no information of that chip, and how to test it..
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Old 04-05-2022, 12:36 AM   #347
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

If this helps ...

I asked the eBay seller ( chinese ) if he sells like in the photo he put - blister pack. waiting for the reply
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Old 04-05-2022, 01:51 AM   #348
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

i don't think that waiting others months helps much the repair, it's like cold pizza..
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Old 04-07-2022, 02:36 PM   #349
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Hi

So I measured :
Both QF1 QF2 measure ~3Khz
All the AZ431 pins fluctuate V.
U2 Opto : Cold side 11.4V and 1.5mV , Hot side Conducts.
3rd IC2 measures are in the photo .

I replaced IC2 and still no High V.
I also measured IC3 pins but ...
I'm done. Finito.

Why shouldn't I use a good PSU board instead ? I need 24V to the BL , and 12V. I'll check price of new one now

P.S found good series in youtube "Howto repair switch mode power supplies".
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Last edited by Ancient1; 04-07-2022 at 02:38 PM..
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Old 04-07-2022, 05:06 PM   #350
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Thank you
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Old 04-07-2022, 05:38 PM   #351
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Todah Rabah.
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Old 04-08-2022, 04:40 AM   #352
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

was it sealed?
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Old 04-08-2022, 08:12 AM   #353
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Davi.P : "sealed" ?? you mean IC2 ? no, I used the 2nd one I bought.
I got no reply from the eBay seller who put a blister pack photo.

See Item 1005002778572497 in Aliexpress. Beside a regular resistor in place of the wire one, it looks identical.
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Old 04-08-2022, 09:05 AM   #354
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

you say 3rd, so it is 2nd.. for a board that cheap get it immediately.. for the ic2 i already said it is probably fake, no useful to mount another from same lot.
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Old 04-08-2022, 11:32 AM   #355
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Ordered.
Expected delivery date : May 12.

I will try using the new to see where the difference to the old is. I'll keep you posted
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Old 04-28-2022, 09:23 AM   #356
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

WOW

First try ! I was prepared for a completely messed up image !!

Few anomalies :
1. the "no Input" box insides split insides
2. Few Horizontal lines showing

But the Menu looks totally normal

I will connect a laptop now, see how this go...
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File Type: jpg 20220428_180742.jpg (638.9 KB, 11 views)
File Type: jpg 20220428_181017.jpg (534.9 KB, 10 views)
File Type: jpg 20220428_181031.jpg (589.5 KB, 11 views)
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Old 04-28-2022, 11:26 AM   #357
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Not Good

1. Horizontal lines
2. Horizontal Areas
3. Middle Vertical area seems darker

The last image (Van Gogh) painting is the original.

I'll try a video to see how it actually looks = usable.

What a saga

by the way. the new board has a 4 Ohm metal film axial Resistor, not wire resistor
Attached Images
File Type: jpg 20220428_193423.jpg (834.9 KB, 9 views)
File Type: jpg 20220428_193545.jpg (649.2 KB, 6 views)
File Type: jpg 20220428_200022.jpg (416.1 KB, 7 views)
File Type: jpg 20220428_200103.jpg (793.2 KB, 6 views)
File Type: jpg 20220428_200220.jpg (548.2 KB, 7 views)

Last edited by Ancient1; 04-28-2022 at 11:28 AM..
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Old 04-28-2022, 02:48 PM   #358
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Sorry, the patient gone... Not good new because i have a tv with similar image
for the 4 ohm resistor this can explain maybe the bad experiments around the pfc area..
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Old 04-29-2022, 01:22 PM   #359
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

I tried a youtube video too, but clearly , the image is very bad
I offered a guy to give him the TV, but its not worth the effort. Clearly unusable

I flipped the TV image vs the Laptop, for better appreciation.
The white strip is in fact where we ripped the Tab off.

The new board R was 4 Ohm and the Wire one ~2 .

I'll take out what I can and put for sale. I doubt I'll get back what money I spent on it - ~$80.
Oh well. Was very interesting ! Thank you so much !!
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File Type: jpg 20220429_172752.jpg (307.1 KB, 8 views)
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Old 04-29-2022, 02:31 PM   #360
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Default Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Quote:
The white strip is in fact where we ripped the Tab off.
this is interesting... indeed i was in doubt if ripping off all or only that tab on the side, but seeing this the tab must be removed all , those maybe interferes with others side, stupid me..
the image on the ripped band appears ok..
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