Seiki SE39UY04 Main board AND Tcon board bad?

[jayjr1105]

Just replaced the main board on this set I picked up for free. The original main board made a weird hissing noise and the standby light just stayed red. New board came in, installed and the noise is gone and the set turns on now (standby light goes from red to blue) also the backlight comes on but now I have no on screen display. No splash screen, volume indicator, etc.

I made absolute sure the main board matched up with my set because there were 3-4 revisions.

Power supply seems rock solid. All voltages are reading as they should.

Tcon is cheap like $12. Should I go there next or did I maybe get a bad replacement main board as well?

[nomoresonys]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Try holding in power button on tv for 30 seconds or until it restarts if it does restart.

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Did that, and it reset once. Now I hold it for a few minutes and nothing.

Still no OSD

[budm]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Did you verify that the LVDS cable from main board to T-CON board is properly seated? Did you check and find out if you do have `2VDC at both ends of the fuse on the T-CON with ref to GND?

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

All cables are nice and snug. Not sure where to measure the fuses on the tcon board. I don't see any fuses. Maybe a surface mount 0 ohm resistor or two.

http://prntscr.com/os6pgl

[R_J]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

The fuse is FP1.

[nomoresonys]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Maybe try a firmware update.
Unplug the power cord from electrical outlet.

Need the firmware on fat32 formatted thumb drive. Plug USB thumb drive into USB input.

Plug power cord back into electrical outlet.

Power on indicator light in the front of the TV will flash red, blue rapidly.

Once indicator light stops flashing and stays red, give it a couple more minutes just for good measure, unplug the power cord.

Remove the thumb drive.

Plug power cord back into electrical outlet and turn on TV.

Do not remove the USB flash disk or power-supply during updating, otherwise the operation will fail.

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Maybe try a firmware update.
Unplug the power cord from electrical outlet.

Plug USB thumb drive into USB input.

Plug power cord back into electrical outlet.

Power on indicator light in the front of the TV will flash red, blue rapidly.

Once indicator light stops flashing and stays red, unplug the power cord.

Remove the thumb drive.

Plug power cord back into electrical outlet and turn on TV.

Do not remove the USB flash disk or power-supply during updating, otherwise the operation will fail.

Where might I find that firmware file? Just a fat32 formatted flash drive?

[nomoresonys]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

No, you need the firmware, isn't there a seiki website?

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

No, you need the firmware, isn't there a seiki website?

Found the firmware. Someone had it dropboxed from a website. Looks like the procedure is to press the menu button, hit 0 four times then hit sw update. Unfortunately I don't have the remote to do this.

[nomoresonys]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

See some here too, some say the 50 inch firmware works better on the 39 some say it don't, I would try the method I posted, might work, won't hurt nothing if it don't, seems to be some modified firmware floating around too, that's if the links work, I didn't click any: https://www.dropbox.com/sh/vjoupvucu...ZvoCukqGa?dl=0

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

That's the link I used. I tried your method, no dice. I think I'm going to bring the board into work tomorrow. A guy has a chip flasher he uses for motherboards. Maybe he can flash my ROM that way.

[nomoresonys]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Well anyway there's 4 pages here, looks like the modded firmware is working best: https://www.overclock.net/forum/44-m...sappeared.html

[diif]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

All cables are nice and snug. Not sure where to measure the fuses on the tcon board. I don't see any fuses. Maybe a surface mount 0 ohm resistor or two.

http://prntscr.com/os6pgl

Did you take the tcon cover off before looking ?, measure both sides of the fuse.

The .img file is really a .tar file. several tools, firmware update and video animation so it's not possible to flash with an external programmer.
It's not ROM (read only memory), it uses NAND flash.

[budm]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Check the Voltage on the SMD fuse on the TC-ON first.

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

With the set powered on, I get .3v on either side of the fuse on the Tcon board. It is labeled FP1 like someone mentioned. White surface mount fuse.

[nomoresonys]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

.3 is too low, how are you measuring? black probe on chassis ground red probe either side of fuse, meter set dcv 20.

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Yes, DC voltage mode. Good meter, probemaster probes with sharp gold tips. 0.3v on either side of the Tcon fuse. Does that indicate a Tcon or Mainboard issue?

[budm]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

Please upload good clear hi-res pictures of the board, especially the main board which the switch 12V to the T-CON is generated from.

[jayjr1105]

Re: Seiki SE39UY04 Main board AND Tcon board bad?

https://imgur.com/a/XU8KTWd