Re: Sony OLED XBR65A8G no video, PSU problem?

Ah! Sorry, I thought I mentionned it: when I turn on the tv there is the thin red line for a second (while EVDD is present) and then it dissapears when EVDD goes away and the screen is all black and I can hear the sound. I felt it was a psu problem too.

I'll take everything apart and let you know if i see anything.

**any way to show me what you mean by edge boards?

Re: Sony OLED XBR65A8G no video, PSU problem?

When I turn on the TV, I get the red line in the middle and I can hear the sound (music from demo mode). It's the same red line that i get in the standalone test.

I can dissassemble some more parts to get access to the edge boards I guess, just let me know what to look for

Re: Sony OLED XBR65A8G no video, PSU problem?

Thanks, replacing the T-CON is the first thing I did when I got the TV and it didn't fix the problem. I'm really afraid that it's the screen that's defective, can you think of anything I can do to confirm it's the TCON and not the OLED panel itself? I'd order another TCON but I feel it's going to be another 100$ thrown out the window.

*** I tried heating the ICs without luck

Re: Sony OLED XBR65A8G no video, PSU problem?

Ok, I found out it was a ground problem, I hadn't put all the screws on tht PSU and when I did it fixed the problem of the missing 24v when the TCON was disconnected.

So just to go back a step, here are the voltages [B]on the PSU alone, with nothing connected:[/B]

TCON_12V: 12.73v
EVDD: 22.08

[B]Voltages on the fuses on the TCON when connected to PSU but 4 x flat cables [U]Disconnected[/U] from the screen:[/B]

VIN:12.67V
VDD: (Both fuses, both sides): 22.08V
...

Re: Sony OLED XBR65A8G no video, PSU problem?

So I unplugged the 4 TCON Ribbon connectors, voltage stays at 22.07.

On a side-note, afterwards I unplugged the TCON from the PSU to see if I had a higher 24V EVDD directly on the PSU nothing was plugged in and it looks like it's some kind of "pull up" because the EVDD voltage on the PSU is 0 unless the TCON is connected....

Re: Sony OLED XBR65A8G no video, PSU problem?

The two fuses on the EVDD side have 22.06V on both sides and the VIN fuse is 12.5V...

Re: Sony OLED XBR65A8G no video, PSU problem?

Thanks for the detailed walkthrough Diah, this is exactly what I wanted to do but somewhat wasn't able to achieve (testing boards individually).


So I bridged the pins with the standby voltage and got the right EVDD and TCON voltages. I then plugged in the VIN and EVDD cables in the TCON and got that weird red line on the screen instead of the color test.

Bad panel?...

Hi, I bought a defective OLED Tv thinking I would just replace the defective board and make it work. The problem was that the TV would turn on with sound but no image. I replaced the TCON first, didn't do anything so I replaced the main board and psu boards too but to my surprise the problem is still there.

So I began testing the PSU to see if at least all voltages were good. What I found is that all the voltages seem good (standby, AC_On, TCON_12v and PWR_On). The missing voltages seem to be EVDD and I'm not sure if BL_ERR should be high or low and if EVDD_ON should be just a pulse...

Re: New Members - please post your introductions here

Hi, I've been repairing stuff on and off since I'm about 8 y.o. I'm equally good at breaking stuff.