Re: Coby LEDTV5028 - No signs of life
This was a response I received from the seller. He seemed pretty knowledgeable.
"This board is very tricky and apparently you must match the model and part number when ordering it. Your tv was a 50" and mine a 39" using completely different software yet the same part number.
Such a major failure on Coby's part but nothing we can do about that."
Well, that stinks. Same part number and version but not compatible.
It doesn't seem that anyone sells the replacement for the LEDTV5028...
MKGort
Member
Last Activity: 06-06-2015, 08:39 PM
Joined: 09-24-2013
Location: GA
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Re: Coby LEDTV5028 - No signs of life
That never occurred to me. I think I will send this board back and ask for a replacement. I'll post the results.
Thank you, again, for the advice.
-MKLeave a comment:
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Re: Coby LEDTV5028 - No signs of life
I reseated the LVDS cable a couple of times just to be sure. I was really hoping it would be the sharpness settings but, alas, no. I was using the VGA port, but even with nothing plugged in it still exhibits this fuzzy picture (see pic).
I am going to try to wiggle the LVDS while the set is on and see what happens.
Thanks again
-MK...Leave a comment:
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Re: Coby LEDTV5028 - No signs of life
Good call. I checked the 5 and 12 and sure enough there was a short. I could not determine where it was coming from, so I found an inexpensive replacement board. It seems to have fixed it, except I am having a picture issue. Do you have any idea what could be causing the odd "offset" in the picture. This also shows in the menu, even when nothing is attached. Could I have gotten a bad board?
Thank you again for your input and help. It is greatly appreciated.
-MK...Leave a comment:
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Re: Coby LEDTV5028 - No signs of life
Well, shoot. I replaced both diodes and all the smaller range caps, but it's still a no-go. Problem still pops up when I plug in the main board.
Could this be a main board problem, or am I still looking for a short on the power board.
Thanks for the help!
-MKLeave a comment:
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Re: Coby LEDTV5028 - No signs of life
Being new to the TV repair hobby, I wanted to make sure I was giving an accurate description of the sound it is making before I start replacing parts:
[url]https://www.youtube.com/watch?v=6ye9SNLG6KA[/url]
Thanks again,
MKRe: Coby LEDTV5028 - No signs of lif...]<br /> <br />Leave a comment:
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Re: Coby LEDTV5028 - No signs of life
The diodes on the board are a HER103G and a HER107G. If I am reading the datasheets correctly, they seem to be very similar to the 1N4007, of which I have plenty. Would it be acceptable to use the 1N4007?
Thank you,
MKLeave a comment:
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Re: Coby LEDTV5028 - No signs of life
Thank you for the response. I will go ahead and order some diodes and replace them first. All of the caps show OK with the meter, so I'll start triple checking them and see what happens with the new diodes.
Cheers,
MKLeave a comment:
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Coby LEDTV5028 - No signs of life
Greetings everyone.
I am looking for some assistance in troubleshooting a Coby TV for a friend.
The model number is LEDTV5028.
There seems to be no power at all to the set. No standby LED or any signs of life.
When everything is plugged in, there is a "chirping" noise that pulses about every second. It seems to be coming from what I believe is a small transformer (red circle in picture).
All voltages are present at the connectors (green circle).
If I disconnect the main board (not shown) the chirping stops,... -
Re: New Members - please post your introductions here
Greetings Everyone.
My name is Matt from Athens GA. I am fumbling my way through the world of microelectronics. I recently began trying my hand at TV repair, and found this forum to very useful. I look forward to growing my knowledge and helping others.
Thanks
MKLeave a comment:
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