Re: TCL 75R615 has sound, no backlight
The only pictures I have are the ones from post #3. Other than that, the TV has been working since the repair, use it every day pretty much.
thetonywarren
Senior Member
Last Activity: 07-14-2023, 10:21 AM
Joined: 02-21-2013
Location: Green Bay, Wi.
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Re: Samsung un32j5205af turns on, but needs to have power disconnected to power back
That's a great idea, I would agree, it doesnt seem like a hardware issue to me, do you have any instruction or help on how to flash/re-write the winbond flash?
Which IC would need to be re-written?Leave a comment:
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Samsung un32j5205af turns on, but needs to have power disconnected to power back on
SAMSUNG UN32J5205AF
Wierd issue. Set turns on, works as normal, then turn off, and when you try to turn back on, it wont. The backlight comes on, but doesnt boot up. You need to disconnect power supply from back, then reconnect it, and then the set works again. somewhat annoying issue.
Where to start? I can provide any videos or pictures needed to troubleshoot....... -
Samsung A21 SM-A215U WONT POWER ON
I have a relative that has a A21 that all of a sudden wouldnt power up, they brought it in to the cellular provider and was told they needed a new battery.
A new battery was installed but this did not correct the issue.
Currently new battery installed, but no signs of life when pressing power button, and also no signs of life if plugged into usb charger.
Where can I start to troubleshoot. Im pretty proficient with troubleshooting as well as soldering. Is anyone out there that can help me get this going... -
Re: Pioneer VSX-3300 Receiver Wont Power On
Any further insight after I posted what I have checked so far?Leave a comment:
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Samsung PN51E450 Plasma Vertical Lines
Friend of mine has a Samsung Plasma panel with some vertical lines that are starting to form on the screen.....Ive never worked on a plasma panel, so Im not sure what to look for, would this typically be a main board issue, or something else?
Any help would be appreciated.....Please let me know....... -
Re: Pioneer VSX-3300 Receiver Wont Power On
this is as far as I have gotten....See picture for details on good/bad components......im sure you guys can see some sort of pattern or where the source of the issue is/was??...Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Ok, great, thanks, I ordered a resistor kit and will start replacing them.......Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
I think I answered my own question, but just looking for verification, I believe by this picture, measurement, and chart attached, that these should be 1/4W resistors.......Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Looks like some of the resistors burned up, Im guessing that's where I let the magic smoke out.......In looking at the documentation, Im not seeing specifications for the required wattage, I think I read there that they should be 5%, but im not sure on wattage and how much that actually would matter.........any input?Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Amazing, thanks for the help with that....
Also is it ok to test the transistors in circuit, vs out of circuit, I just want to be as thorough as possible with my troubleshooting, but dont want to take each one out if not needed.....
Thanks!Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Ok, so I am tracing the circuit back and the next transistors for each channel, from what I can gather are Q509-Q512, I took those out of circuit and tested them, two of which are PNP, and the other two are NPN, I tested them and believe they test good....not shorted, and are showing with my DMM to be passing current correctly......do I stop there or should I keep tracing back to Q505-Q508, and then Q501-Q504? There's also Q515 and Q516 too......Thoughts?
On a different note, the 4 main transistors are from my research obsolete,...Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
So I tested out the 4 main transistors and all 4 are shorted out......
I removed them from circuit just to check all of them, and they are all indeed shorted out.
Then I plugged it in and pressed the power button, the relay/circuit protection clicks in....
but im also assuming I'll have to follow the circuit further back to see if other transistors in the driver stage and pre driver stage, or other components are fried.....Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Ok, I'll see what I can do.....
I appreciate the help, will update with my findings......
If you get a chance to take a look at the schematic that would be awesome....whenever you would have time of course......
Thanks for walking me through this.....Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
Can you be a bit more specific and take a look at the circuit diagram, just to point me in the right direction as to where to start to look?
Any help is appreciated....
Thanks so much.....Leave a comment:
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Re: Pioneer VSX-3300 Receiver Wont Power On
So I was able to replace the suspect cap, and started re-assembly....now I have a different problem.....
As I started to re-assemble, in between mounting boards and re-installing screws, I would pause, plug the unit in, press the power button and make sure things were still working... which they did for a bit, I would press the power button, I would hear the relay click and the receiver would turn on...
I got to a point where I had to step away from it for a few minutes, and I left the unit powered on....then...Leave a comment:
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Re: LG Flatron L1910S DEAD
FYI, I replaced the 0.47uf cap and it's working now, I appreciate the help....
Here's a pic of the screen afer cap replacement.......Leave a comment:
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Re: LG Flatron L1910S DEAD
Yep, I appreciate the help, I actually replaced every cap on the SMPS, so the bad one was the only one I didn't have on hand.....go figure.......Leave a comment:
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Re: LG Flatron L1910S DEAD
Before I saw your reply, I soldered in the 2.2uf in place of the 0.47uf just to try it, and it came right on.....I'll get a new 0.47uf and put that in its place when it comes in......I'll update when I get the new 0.47uf cap.......Leave a comment:
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Re: LG Flatron L1910S DEAD
I have two caps, one of 2.2uf and another is 0.22uf, will either of those be ok???
both are rated at 50vLeave a comment:
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