Seiki SE50FY10 sound no picture, NEW main board

[zacheriaj]

When I got this unit from the customer, it had sound and no backlight. PSU tested fine and when you pressed power, the light would turn blue as if it were on but no backlight. I figured the main board was out. Bought a new one from SJ and has the same symptoms. And to minimize questions, I did ensure that part numbers and panel numbers were the same. Any ideas?

[budm]

Re: Seiki SE50FY10 sound no picture, NEW main board

Please upload the pictures of the whole back side of the TV so we can see how all the boards are connected together.

[zacheriaj]

Re: Seiki SE50FY10 sound no picture, NEW main board

here are the boards

Please upload the pictures of the whole back side of the TV so we can see how all the boards are connected together.

[dkneyle]

Re: Seiki SE50FY10 sound no picture, NEW main board

What makes you think the backlights are OK? That would be the next place I'd be going. Not sure why you initially diagnosed mainboard? Is this a LED LCD TV? If it is I'd say you have a failed LED in the backlight.
Ah YES. I just looked at the power supply board. Know it very well. This TV sells here in Oz as a Palsonic. Crap. You'll find you have a failed LED in the string. I've just sold a LED string to a guy with the same fault, cannibalised from my TV that I couldn't repair because I couldn't get a LED string. If you want to risk opening the panel up carefully you can repair it, but they are such cheap TVs with further LEDs likely to fail you have to ask yourself if it's work the effort.

[zacheriaj]

Re: Seiki SE50FY10 sound no picture, NEW main board

What makes you think the backlights are OK? That would be the next place I'd be going. Not sure why you initially diagnosed mainboard? Is this a LED LCD TV? If it is I'd say you have a failed LED in the backlight.

LED. With the PSU being tested OK, minus the BL on from main board, I assumed the EEPROM was at fault on the main. Replaced EEPROM, and the tv did nothing. Contacted SJ and they sent a replacement EEPROM at the same time I received the new Main board. with the new main board in, it's back to the TV turning on except for backlight. Is there a way to test the backlights?

[dkneyle]

Re: Seiki SE50FY10 sound no picture, NEW main board

By the way, anyone else fault finding a TV with similar symptoms, always do the flash light test first. If you have sound and no flashing fault codes etc then it is likely you have a picture but no backlighting. In this TV the voltage across the string is about 120VDC. If that is coming out of the power supply then it dismisses power supply as being the problem.

[zacheriaj]

Re: Seiki SE50FY10 sound no picture, NEW main board

flashlight test was fine. simply no backlight.

[budm]

Re: Seiki SE50FY10 sound no picture, NEW main board

Check the DCV between the Red wire of the LED connector CON 11 and GND to see what you have when TV is turn on.
The LED strings are connected in series, the first string is on CON 11.
MEGMEET MIP550D-5tb
Pictures provided by shopjmmy.

[zacheriaj]

Re: Seiki SE50FY10 sound no picture, NEW main board

check the dcv between the red wire of the led connector con 11 and gnd to see what you have when tv is turn on.
The led strings are connected in series, the first string is on con 11.
Megmeet mip550d-5tb
pictures provided by shopjmmy.

123vdc

[budm]

Re: Seiki SE50FY10 sound no picture, NEW main board

You have open circuit in the LED strings.

[zacheriaj]

Re: Seiki SE50FY10 sound no picture, NEW main board

You have open circuit in the LED strings.

That voltage compared to chassis ground. Yikes. I was afraid of that. Looks like I'll be eating the cost on this one. Thank you BUDM. I learn something new from you on every repair.

[gtc526]

Re: Seiki SE50FY10 sound no picture, NEW main board

You have open circuit in the LED strings.

Thanks budm....I also researched this same problem and stumbled upon this thread. You were correct as well for my issue.

Did the flashlight test (saw picture). Tested voltage at COM11 (120V). Took apart panel and seen browning around some of the LED lights on the front of strips. Took the strips off and seen the burnt marks on the back of a few strips. One was more obvious than others. It looked like all five strips were about ready to go. I uploaded pics of the strips.

Question:
Would it be worth to strip down the working parts and sell them individually on Ebay or would it not be worth my time? I paid $195 for this TV on BF 2013 so I'm not out much and I got 2 1/2 years out of it. Lesson learned though to buy a warranty on the cheapo ones. My LG nd Sammy had warranties, but never any issues.

[gtc526]

Re: Seiki SE50FY10 sound no picture, NEW main board

Pictures of LED Strips

L9 seems to be the main culprit on the smaller strip

L6 looks like it's going on on every single large strip with one also having a burnt mark on L4

On just about every strip on the front side you can see some level of discoloration

[budm]

Re: Seiki SE50FY10 sound no picture, NEW main board

It looks like they got hot, so you need to test ALL the LEDs.
reeceyburger123 has the video on how to test them.

[ReeceyBurger123]

Re: Seiki SE50FY10 sound no picture, NEW main board

Cheers bud, here is the link to the video on repairing and testing Leds:

https://m.youtube.com/watch?v=RxwdC7V5Ue0

[gtc526]

Re: Seiki SE50FY10 sound no picture, NEW main board

It looks like they got hot, so you need to test ALL the LEDs.
reeceyburger123 has the video on how to test them.

Thanks for the response, but I already stripped down everything after I cracked the panel. Even if I didn't I think it wouldn't be worth the time and effort looking at how many LEDs would be problematic in the near future and would have to redo the process again.

Would it be worth my time though to sell these parts individually? Like I said before, I only paid $195 for the TV so the hit isn't that bad since I got 2 1/2 years out the thing, but if I can make any money off the parts then that would be a bonus.

[ReeceyBurger123]

Re: Seiki SE50FY10 sound no picture, NEW main board

Well I have had Led Tv's which I have repaired the backlight on sold for 1year and 5 months to be exact and not had one come back and seeing as it only lasted 2 years before it first failed its not that bad. Also I have done over 50 so far not one come back yet..... How did you crack the screen too ? I have never accidentally cracked one at all. Just dont see how people do it lol

[gtc526]

Re: Seiki SE50FY10 sound no picture, NEW main board

Well I have had Led Tv's which I have repaired the backlight on sold for 1year and 5 months to be exact and not had one come back and seeing as it only lasted 2 years before it first failed its not that bad. Also I have done over 50 so far not one come back yet..... How did you crack the screen too ? I have never accidentally cracked one at all. Just dont see how people do it lol

I had a tape measure (heavy duty) sitting on the counter and knocked it off by accident. Bounced perfectly onto where I had the panel laying and hit the corner and spiderwebbed a section. Into the it went.

[iSellHomes]

Re: Seiki SE50FY10 no picture or sound, NEW main board

Hello all, I have a Seiki SE50FY10 LED TV will no sound or video. The power board, MIP550d-5TB, is sending out 11.3V to the main board. Is that within spec and I should replace the Main Board, CV3393BH-F, or is that an indication my power board is bad?
Thanks for any help.

[web5]

Re: Seiki SE50FY10 sound no picture, NEW main board

Hi, my SE50FY10 today stoped working, boots and operate as usual, i can see the picture with flashlight, but no backlights.
It started a few days ago with blinking at start, and sometimes started normally with backlight. But today not blinking at start but still can see picture with flashlight.
Please help.