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So you're saying the datasheet you posted is not the right one?Comment
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12 pin is GND, and VCC is 10 pin.Attached FilesPremium supporters get full download access and other benefits.
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Ok, not exactly sure but might be able to get a clue by testing resistance from neg. leg of filter cap to pin 10 VCC, see what you get, done with tv unplugged from power.Last edited by nomoresonys; 03-19-2025, 01:11 PM.Comment
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It was Nicks datasheet that said 12 pin is VCC.Comment
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I am not mistaken in this case, in post #10, the datasheet clearly labels pin 12 as VCC, so it must not have been a match to your IC.Last edited by nomoresonys; 03-20-2025, 06:27 AM.Comment
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What do y'all think? seeming like a capacitor issue maybe?Comment
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UCC28064A and FA6B22N are completely different microcircuits and we were talking specifically about FA6B22N.​Comment
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That explains it, picture was not very clear.Last edited by nomoresonys; 03-20-2025, 07:23 AM.Comment
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Maybe reflow the solder joints on the transformers and anything on a heatsink or any others that may need it, just in case it's a simple thing like that.Comment
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Maybe check DM807 and that little transistor next to it.Comment
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Can you post a good clear picture of that IC and the mosfet area you replaced? can be two pictures just need a little more detail.Comment
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Make sure none of the resistors are bad or have risen in value, it doesn't take much to mess up the balance.Comment
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Let me know if these are sufficientAttached FilesPremium supporters get full download access and other benefits.
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Guess this ones too tough for me, maybe test all your blue ceramic caps on top of board, test them in ohm mode in circuit, they should probably read in the m or k ohms. They can be bad and not show externally, I assume you did check all the solder joints paying extra attention to transformers and things on heatsinks, the joints can get micro-cracks that are not easily detected. Just tried this test but didn't work on my meter tho.Last edited by nomoresonys; 03-21-2025, 09:06 AM.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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I did not have any 27uf @ 50 volt capacitors but one nice thing is that it has enough room for two capacitors in parallel a 22uf and a 4.7uf @ 50 volts 22 plus 4.7 equals 26.7uf which so very close to 27uf I will show some pictures of it sometime tomorrow
This is one of the shit est boards I seen in a very long time and it was the daughter board the traces just lifting off the board I had to use the capacitor leads to repair the the traces and the main board is not any better because I had to repair several traces for the daughter board to the main board
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I am attempting to test a samsung power supply board to verify the pfc ic is working. I am powering up the board with my isolation transformer. The board turns on fine but when I attempt to connect the ground for the scope probe, it trips out the isolator. I was taught not to 'float my scope' so I am wondering if I should test without connecting the ground lead or would that be asking for trouble? Not sure how else to test, I don't have a portable scope. I could plug direct to mains power but that would bypass the safety factor.
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I picked up this TV from Facebook Marketplace, original owner described it as "screen went black after a pop" and I hoped to see an obvious fuse or cap to replace. Doesn't seem to be the case, but my experience and electrical knowledge are kind of limited for this.
The power board (BN44-00445A, see attached) turns on and Vs and Va seem to momentarily have power, then they steadily drain to zero over a minute or two as if they're only getting power from capacitors. I've been measuring Vs and Va from the test pads, with and without the other boards connected to the power board... -
I was working on this CNC machine today found no keyboard functioning no control relay powering on
The screen powered on and was giving an operation error but the manual was not very clear about what the error exactly was but with a little bit of troubleshooting and finding out that the control relays not powering on and no keyboard functions we narrowed down to this one switching power supply which of course does not have any indicator LED light they are on the keyboard interface/relay controller board
Found shorted diodes on main controller relays there are 3 of them that...
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