Hello all!! My name is Jake and I am new to badcaps.
First and foremost, this forum is a god sent!!! A big thanks to all members for the valuable info you have posted here. I didn't know were to begin till I found this site.
Just a brief rundown of my background:
4 years experience troubleshooting hardware and software defects for a certain computer manufacturer that promises to make the PC personal again (uh-huh). But most of that was replacing entire hardware rather and troubleshooting the hardware itself. Didn't fix the motherboards, we just replaced them.
After that about 8 years experience in industrial maintenance, factories and such.
So I am pretty familiar with a multi meter and with electronic hardware, just not both at the same time, lol. In other words, I know just enough to be dangerous, so please be patient with me.
Ok, lets get down to it.
POTENTIAL CAUSE:
While undoing some tangled cables behind my entertainment system, I saw the flash of an arch. Not 100% sure that was the cause because my TV kept working for several hours before crapping out.
SYMPTOMS:
After the short happened, nothing seemed to change. A few hours later the TV shut itself off while my kids were watching a movie. I turned the TV back on and got no pic, just the NO SIGNAL icon came up on the TV. Cant say about the sound, it is always turned off. Bluray goes to the receiver, then from the receiver to the TV. I had sound from the receiver though.
So I moved the HDMI cord to different ports, to avail. Still a no signal icon on the TV. Tried different inputs at the receiver which controls input selection to the TV.
After trying this for about ten minutes, the TV turns itself off again, the VISIO insignia on the front went from white to orange. I could not get it to turn on after that, not with the power button or the remote, but the VISIO insignia remained orange.
TROUBLESHOOTING ATTEMPS:
I tried the easy fixes first:
Different outlets
Unplugged it for 6 hours
Different power cord/data cables/inputs
No dice
Next, I visually checked all the caps. No leaking or bulging.
Checked the main board for burns, found nothing.
After that a continuity check of all onboard fuses, all checked out good.
Check the power button and got voltage going through when pressed.
Next, I went for the volt regs. I found a lot of them but half of them are common 3 pronged regulators, the other are 8 pronged (not sure if the 8 prong ones are even volt regs). So far I have only checked the three pronged ones. I cant seem to find the datasheets for the 8 prong ones. U33 is one of the 8 prong ones, I did take readings on that one, seemed there is a lot of chatter about VISIOs having problems with U33, but without a datasheet, the readings from U33 don't mean much to me.
Anyways, here are the results of the readings. With the fat tab up, pins 1, 2, 3 from left to right.
Adjustable Voltage Regulators with Part #1117 (no suffix for prefix):
U2
Pin 1 - 2.1
Pin 2 - 3.3
Pin 3 - 5.1
U4
Pin 1 - 0.0
Pin 2 - 1.2/1.3 (I am assuming it was drifting cause my meter only reads to the tenth, and the correct reading should be 1.25)
Pin 3 - 3.3
U7
Pin 1 - 2.0
Pin 2 - 3.3
Pin 3 - 5.1
U46
Pin 1 - 2.1
Pin 2 - 3.3
Pin 3 - 5.1
Voltage Regulators with Part # G1084
U3
Pin 1 - 2.1
Pin 2 - 3.3
Pin 3 - 5.1
TU5
Pin 1 - 0.0
Pin 2 - 0.0
Pin 3 - 0.1
Voltage Regulators with Part # 7805CT (I am suspicious of this one)
U8
Pin 1 - 12.3
Pin 2 - 0.0
Pin 3 - 5.0
8 Prong Voltage Regulator with either Part # A22334 or 4953GM, not sure but if I had to choose it would be A22334. It was the one on the second row, all other components with 2 number series on them list the part number second.
With the numbers oriented upright, Pins 1-4 are the pins on top, from left to right, Pins 5-8 are the pins on bottom, from left to right.
U33
Pin 1 - 0.0
Pin 2 - 0.0
Pin 3 - 0.0
Pin 4 - 0.0
Pin 5 - 12.3
Pin 6 - 12.0
Pin 7 - 12.3
Pin 8 - 12.0
To be honest, I'm not sure that U33 is a volt reg, but I think I read somewhere that U33 feeds several of the other volt regs so I took a reading. I found only one other component with the same part # as U33, here are the readings.
U1
Pin 1 - 5.1
Pin 2 - 5.1
Pin 3 - 5.1
Pin 4 - 5.1
Pin 5 - 5.1
Pin 6 - 0.0/0.1
Pin 7 - 5.1
Pin 8 - 0.0/0.1
I understand my multi meter does not go to the thousandths, so if more accurate readings are needed I will redo them with a different meter.
I've been suspicious of the main board (perhaps misguided) which is why I attacked it first. At this point I need to know where to go from here. Any help would be huge!!
Pics of my main and power board are attached.
Thanks in advance for the assistance!!
Jake
First and foremost, this forum is a god sent!!! A big thanks to all members for the valuable info you have posted here. I didn't know were to begin till I found this site.
Just a brief rundown of my background:
4 years experience troubleshooting hardware and software defects for a certain computer manufacturer that promises to make the PC personal again (uh-huh). But most of that was replacing entire hardware rather and troubleshooting the hardware itself. Didn't fix the motherboards, we just replaced them.
After that about 8 years experience in industrial maintenance, factories and such.
So I am pretty familiar with a multi meter and with electronic hardware, just not both at the same time, lol. In other words, I know just enough to be dangerous, so please be patient with me.
Ok, lets get down to it.
POTENTIAL CAUSE:
While undoing some tangled cables behind my entertainment system, I saw the flash of an arch. Not 100% sure that was the cause because my TV kept working for several hours before crapping out.
SYMPTOMS:
After the short happened, nothing seemed to change. A few hours later the TV shut itself off while my kids were watching a movie. I turned the TV back on and got no pic, just the NO SIGNAL icon came up on the TV. Cant say about the sound, it is always turned off. Bluray goes to the receiver, then from the receiver to the TV. I had sound from the receiver though.
So I moved the HDMI cord to different ports, to avail. Still a no signal icon on the TV. Tried different inputs at the receiver which controls input selection to the TV.
After trying this for about ten minutes, the TV turns itself off again, the VISIO insignia on the front went from white to orange. I could not get it to turn on after that, not with the power button or the remote, but the VISIO insignia remained orange.
TROUBLESHOOTING ATTEMPS:
I tried the easy fixes first:
Different outlets
Unplugged it for 6 hours
Different power cord/data cables/inputs
No dice
Next, I visually checked all the caps. No leaking or bulging.
Checked the main board for burns, found nothing.
After that a continuity check of all onboard fuses, all checked out good.
Check the power button and got voltage going through when pressed.
Next, I went for the volt regs. I found a lot of them but half of them are common 3 pronged regulators, the other are 8 pronged (not sure if the 8 prong ones are even volt regs). So far I have only checked the three pronged ones. I cant seem to find the datasheets for the 8 prong ones. U33 is one of the 8 prong ones, I did take readings on that one, seemed there is a lot of chatter about VISIOs having problems with U33, but without a datasheet, the readings from U33 don't mean much to me.
Anyways, here are the results of the readings. With the fat tab up, pins 1, 2, 3 from left to right.
Adjustable Voltage Regulators with Part #1117 (no suffix for prefix):
U2
Pin 1 - 2.1
Pin 2 - 3.3
Pin 3 - 5.1
U4
Pin 1 - 0.0
Pin 2 - 1.2/1.3 (I am assuming it was drifting cause my meter only reads to the tenth, and the correct reading should be 1.25)
Pin 3 - 3.3
U7
Pin 1 - 2.0
Pin 2 - 3.3
Pin 3 - 5.1
U46
Pin 1 - 2.1
Pin 2 - 3.3
Pin 3 - 5.1
Voltage Regulators with Part # G1084
U3
Pin 1 - 2.1
Pin 2 - 3.3
Pin 3 - 5.1
TU5
Pin 1 - 0.0
Pin 2 - 0.0
Pin 3 - 0.1
Voltage Regulators with Part # 7805CT (I am suspicious of this one)
U8
Pin 1 - 12.3
Pin 2 - 0.0
Pin 3 - 5.0
8 Prong Voltage Regulator with either Part # A22334 or 4953GM, not sure but if I had to choose it would be A22334. It was the one on the second row, all other components with 2 number series on them list the part number second.
With the numbers oriented upright, Pins 1-4 are the pins on top, from left to right, Pins 5-8 are the pins on bottom, from left to right.
U33
Pin 1 - 0.0
Pin 2 - 0.0
Pin 3 - 0.0
Pin 4 - 0.0
Pin 5 - 12.3
Pin 6 - 12.0
Pin 7 - 12.3
Pin 8 - 12.0
To be honest, I'm not sure that U33 is a volt reg, but I think I read somewhere that U33 feeds several of the other volt regs so I took a reading. I found only one other component with the same part # as U33, here are the readings.
U1
Pin 1 - 5.1
Pin 2 - 5.1
Pin 3 - 5.1
Pin 4 - 5.1
Pin 5 - 5.1
Pin 6 - 0.0/0.1
Pin 7 - 5.1
Pin 8 - 0.0/0.1
I understand my multi meter does not go to the thousandths, so if more accurate readings are needed I will redo them with a different meter.
I've been suspicious of the main board (perhaps misguided) which is why I attacked it first. At this point I need to know where to go from here. Any help would be huge!!
Pics of my main and power board are attached.
Thanks in advance for the assistance!!
Jake
Attached Files
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