Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds

Haven't tested it yet, but I did replace the cap with a 4.7uF 35V SMT. This one isn't shorted

I was thinking and I realized that the TV only uses a 2 prong plug. Is there any reason why I shouldn't replace that entire wire with a 3 prong plug one, and connect the ground to the chassis of the TV?

Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds

D'oh you're right. Of course. Only one of them needs to be shorted for them all to appear shorted.

It was indeed C3214. After that was gone, pins 5 and 7 on IC3201 no longer test as continuous.

The resistance between GND and P-ON+21V goes into the 10kΩ range, too.
Thank you so much! Hopefully that was the only issue.

Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds

Well, I'm in it to win it I guess.

I don't think the earlier linked documentation is super helpful since it doesn't even have a model number, and there's just a schematic diagram. That main board is using DDR3 SDRAM, my board has DDR2.

Found a picture of the main board BA31T0G0201_3 online, and also have a picture I took of my own board.

[URL="http://assets.shopjimmy.com/media/catalog/product/cache/1/image/f8f28dc4a19c21aeb55ee5774693fb5d/s/h/shopjimmy-a3ap1mma-001-top.jpg"]http://assets.shopjimmy.com/media/catalog/product/cache/1/image/f8f28dc4a19c21aeb55ee5774693fb5d/s/h/shopjimmy-a3ap1mma-001-top.jpg[/URL]...

Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds



GND and ALL+3.3V: 621 Ω
Gnd and AMP+13V: 1.68 kΩ
GND and P-ON+21V: 7.7 Ω

So uh, there's the smoking gun I guess?

I poked GND and P-ON+21V with cables disconnected and got a value between 20k and 50kΩ (well it said something like 50kΩ at first, and increased, then I probed again after a while, and it was around 20kΩ and increasing)

Tested these with a continuity meter too. They don't seem to be shorted , though D654 beeps...

Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds



For my own benefit, can you explain why parallel diodes are worse than a single diode? Is it because there's twice as much chance of failure?

Or maybe because real parts aren't ideal, and can have different forward voltages, so most of the current will go through the diode with a smaller forward voltage?...

Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds



There is no chirping when the ribbon to main board is disconnected.
I suppose I can poke around the main board too. Do I need to disconnect capacitors, or can I just use the continuity tester on my multimeter?


Yes, page 48 for the schematic, and 66 for the Circuit Board Assembly



Thanks for the help!...

Re: BA3AU0F0102_3 PSU transformer chirps every 2 seconds

Do you mean these?
D650 Diode
D653 Diode
D655 Diode
C651 Cap
C656 Cap
D654 Zener

...

I have a BA3AU0F0102_3, a power supply that's usually found in Phillips, Magnavox, Emerson, Element, etc.
My TV's particular model is ELEFW605, maybe that helps.
I don't know the background of the TV - I found it by my apartment's dumpster practically new in box - still had all the styrofoam, and a bunch of the baggies that the cables come in. No receipt though! One man's trash is another's treasure, so I decided to try and fix it.

I found this thread: [url]https://www.badcaps.net/forum/showthread.php?t=48259[/url]
But for most of that thread, I believe people were...

Re: New Members - please post your introductions here

Hi. I'm a recent grad who picked up a giant tv by my apartment dumpster. One man's trash is another's treasure, right?

Well, it's power supply is busted. But I've got a multimeter and effort to spare to try to fix it, so here I am!