Hier einmal ein kleiner Nachtrag:

Inzwischen bin ich dem Fehler auf der Spur. Nach Lösen des LVDS Kabels vom t-con board, stellte ich einen Kurzschluss auf dem t-con board am Eingang fest. Als Übeltäter war ein SMD Kondensator (C10) für den Kurzschluss verantwortlich. Nach Wechsel des Kondensators war der Kurzschluss weg und die Versorgungsspannung von 12V DC konnten am Eingang gemessen werden. Im t-con board war wieder Leben zu spüren.

Als Erfolg dieser ERSTEN Reparatur konnte ich die fehlenden Spannungen auf den anderen PCBs messen. Auch die 24V DC auf dem Power Supply sind nun da! Das Backlight ist auch wieder vorhanden.

Dies ist ein riesiger Schritt in die richtige Richtung. Nun das Bild wird noch nicht angezeigt. Vermutlich ist noch ein weiterer Fehler auf dem t-con board.

Ich packe mal ein Bild von meinem t-con board hier rein. Vielleicht hat ja nun einer von euch einen Tipp, wo es weiter gehen soll.

I will answer in English

First, find the LCD panel model on the sticker. Then, do a search on the Internet to find if a replacement T-CON board can be found for that model.

Repairs at the component level on this board are difficult without a schematic if the damaged part can't be identified visually.

Good luck.

 

very interesting findings! Well done!

I have a BeoVision 7-40 MK6 (Type 7741) as well with exacly the same fault, so I will try to dismantle it at some point and hopefully be able to repair it as well.

So as I understand it, there was no additional fault after all? But you are missing the correct value of the faulty capacitor?

/Dennis

Hello Dennis,

correct! No additional fault but I have no information about the faulty cap. When I see it correctely the cap works parallel with another cap against GND and is in line with a coil. So it is only a filter.

If you have the same problem with your MK6 unplug the LVDS cable and check if there is a short in the supply chain. If you find 0 ohms between the fuse and GND then it could be the same problem as mine.

Good luck.

Congratulations!

It is a good thing that we are able to repair our TVs even if they are "officially" too old. Having to discard an expensive and beautiful TV because of a small capacitor is ridiculous.

To find the exact capacitance of the cap, the only way would be to remove it on a working board, measure it, and put in back in place. Perhaps also there is a schematic of the T-CON board somewhere.

 

 

link

To find the exact capacitance of the cap, the only way would be to remove it on a working board, measure it, and put in back in place. Perhaps also there is a schematic of the T-CON board somewhere.

So it is! But the problem is that to remove a working t-con board from the BV is too time-consuming and I think that nobody destroy" a good BV7-40 only to get the value of this tiny capacitor. If anybody owns a working t-con board for the BV7-40 MK6 and want to sell it ... here is your buyer! I tried all to get the schematic of the t-con board but without success. I wrote an email to SAMSUNG with the result that they said, 'It's a B&O and therefore we have no schematics or manuals for the panel or t-con or LED driver'. The answer from B&O is, 'We don't give any documents to end customers and by the way it's a SAMUNG device'. It is really frustrating to deal with such arguments. Maybe some day WE - and of course the manufactures - realize that we have to get rid of the "throwaway society".