Seiki se421tt

[wintersoldier12]

Re: Seiki se421tt

I know this is an old thread but I am having a similar problem. I recently discovered a Seiki LE-55GB2 Television that does the exact same thing. Picture and sound are great, however the TV is not reliable. It will shut down without notice at any given minute, sometimes working hours before shutting down. Blue LED on front stays on the whole time. You have to power the set down, let it rest a few minutes before it will power back up. Other times it will shut down every 10 minutes. Its a great looking set and I really want to keep it going if I can as I found it on the curb worst case I am keeping it for a garage TV or something. Its just too great of a picture to just give up on.

I popped it open and checked for any shorts or signs of bulged caps, no luck. However the power board has some scorch marks near JP25 Center transformer right where the wording is near the prongs. http://assets.shopjimmy.com/media/ca...402a-top_5.jpg
I am assuming there is a short somewhere. I thought of ordering a new powerboard but they are scarce and your gonna pay for it. Before I make the commitment I want to ensure its' the part I should be focused on rather than just throwing money at it and hoping it works. I have read a lot of tips on here and I was wondering if someone has had more experience with this problem in the past?

[heavymachines]

Re: Seiki se421tt

Did get it working then about a week later did same thing i just junked it.... it blew diodes that time and yeah i tossed it.

[70JUDGE]

Re: Seiki se421tt

Maybe this might help.Under specifications,it shows what components might be going bad.Thank You very much!

Tyler

http://www.shopjimmy.com/viore-htx-p...repair-kit.htm

[toddmc451]

Re: Seiki se421tt

To heavymachines:

I see no follow-up post from you after the 10/27/2012 - and was wondering if you found anything else?

I am working on a similar problem for my Son-in-law.

Thanks!

[heavymachines]

Re: Seiki se421tt

well it still shuts off and transformer is hot, this this is a big P.O.S....will recheck for shorts...

[heavymachines]

Re: Seiki se421tt

Good, I am glad you located the shorts that way you do not have to take it apart again, you may as well look at the other 3 to see if the same thing can happen on the other 3set of wires, just for prevention. I am sure there are other TV with this sample with the same problem. You can use KAPTON tape.
Can I see the pictures?
By the way, I have never heard of this TV brand before, may be they do not sell them in California.

already thought of that, its a nightmare to take apart and put back together, so i did preventative measures and insulated under those wire the whole way to the though hole...


i am certain if you look hard enough you will find this cheapo in cali ...cali has everything i used to live there....

[heavymachines]

Re: Seiki se421tt

The screen isn't a Samsung or something? Sounds pretty poor. I have noticed a lot of price slashing in the LED TV market, so expect to see a lot more failures soon.

there is no good brand name on this set anywhere as labels are concerned. Black Friday special here...got it back together now testing, so far so good...not celebrating yet till it can do 24hrs....

[tom66]

Re: Seiki se421tt

Tianle micro electronics or dynamic those are the only clues....and its cheap as it gets....

The screen isn't a Samsung or something? Sounds pretty poor. I have noticed a lot of price slashing in the LED TV market, so expect to see a lot more failures soon.

[budm]

Re: Seiki se421tt

Good, I am glad you located the shorts that way you do not have to take it apart again, you may as well look at the other 3 to see if the same thing can happen on the other 3set of wires, just for prevention. I am sure there are other TV with this sample with the same problem. You can use KAPTON tape.
Can I see the pictures?
By the way, I have never heard of this TV brand before, may be they do not sell them in California.

[heavymachines]

Re: Seiki se421tt

Who made the panel in this TV, out of curiosity?

Tianle micro electronics or dynamic those are the only clues....and its cheap as it gets....

[tom66]

Re: Seiki se421tt

Who made the panel in this TV, out of curiosity?

[heavymachines]

Re: Seiki se421tt

May be put the meter in the beeper mode and move the wire or flex the screen a little to see if you can make the meter beep.

ok spotted the shorts, there were 2 shorts one red wire and one black wire and its located right were it goes into led strings and the aluminum bars that hold those leds in place has fairly a sharp edge and low behold i found bare copper in the wires, i will wrap them up and probably use a file on those sharp edges.

[budm]

Re: Seiki se421tt

May be put the meter in the beeper mode and move the wire or flex the screen a little to see if you can make the meter beep.

[heavymachines]

Re: Seiki se421tt

They are separate strings. Yes the wires for the assembly are very fine and it may got cought on a sharp corner somewhere and the insulation got damaged. The problem may come back if you cannot locate the short that went away. At least we are getting some where.

can't see any sharp corners, the wire pass threw has a rubber boot, so only thing i can think of is to use packing tape under the wires where it makes contact with the sheet metal since there is zero insulation under those wires. what is your thought? i can't see any other area thus far....BTW thanks for working with me

[budm]

Re: Seiki se421tt

They are separate strings. Yes the wires for the assembly are very fine and it may got cought on a sharp corner somewhere and the insulation got damaged. The problem may come back if you cannot locate the short that went away. At least we are getting some where.

[heavymachines]

Re: Seiki se421tt

okay after i took the panel apart the short to chassis seems to disappear and it will power all led again i am certain each string is independent of each other, there are 4 total , one on each side and 2 on bottom, i think its grounding out thru either the coating on wire somewhere, what can i use to wrap them wires and not take too much space since it is very tight tolerances. Thanks in advance...

[heavymachines]

Re: Seiki se421tt

You have 4 connectors for the 4 LED strings, so right now one of the connector show low resistance to the chassis compared to the other 3? I will wait to see the pictures, most TV with LED will have the LED assemblies on the bottom edge of the screen for the edge-lit TV.
By the way, I see you are working on two TV's.

actually working on three tv's it has one sting on each side and 2 strings on bottom...none on top.....each string has its own connector. I will see what i can do for pictures, thanks for helping me out.

[budm]

Re: Seiki se421tt

You have 4 connectors for the 4 LED strings, so right now one of the connector show low resistance to the chassis compared to the other 3? I will wait to see the pictures, most TV with LED will have the LED assemblies on the bottom edge of the screen for the edge-lit TV.
By the way, I see you are working on two TV's.

[heavymachines]

Re: Seiki se421tt

okay i found resistance from red wire to chassis and like you said very low resistance but enough to upset the tv, anyhow i have it torn down to access the leds and will post what i find it has 2 rows on sides each having one connector and the strip on bottom has two connectors on each end of the strip i will post more of what i find...

[heavymachines]

Re: Seiki se421tt

If you unplug one of the LED string and the TV started up, then you may have cable that may be shorted to the chassis, the LEDs are connected in series, so if one short out, it is not likley to be enough to cause it to draw too much current. One string of LED may have 50 or more LEDs in series.
I unplug the LED cables and measure between pins and also measure between pins and chassis to see if it shows any low resistance reading.

Thats a very good theory of whats going on and makes total sense i will have to check that out, all the pains of taking panel apart seems to be in order will report results... of course test resistance before the big task.... Thanks budm