Re: Vizio Symptoms and Possible Solutions
I have an E420VL, I think, and it has multiple voltage regulators on the board. They are a high failure part. I would suggest checking them. There is likely several posts that I made a few years ago about them. They all had a common IC that regulated to a lower voltage.
I have a feeling the 'input select' switching devices(ICs) are not doing their job as something glitched causing the HDMI, PC or TV selections to fail unless the PC has voltage on pins 9,12,13 and 15.
The boardI had(now on the workbench in the basement) failed...
tmwalsh
Senior Member
Last Activity: 09-01-2023, 09:18 AM
Joined: 01-07-2009
Location: suburban atlanta
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Re: Vizio M420SL Backlight Issue
NoMore is suggesting changing the load on the backlight power supply by demanding less to see if the power supply will totter on for a while longer with less demand.
If there are no shorts in the diodes, the supply is likely the problem area. You could measure the amps required by the strings to see if they are more than nominal.
tomLeave a comment:
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Re: LG47LN5700 With no image
daveFiguera:I put the positive cable of the multimeter in the channels and the negative cable in GND, with no LED's connected in the PSU
CH1 + and GND = 163V to 77V
CH1 - and GND = 28V
CH2 + and GND 163V to 77V
CH2 - and GND = 28V
I put the positive cable of the multimeter in the channels and the negative cable in GND with LED's connected in the PSU
CH1 + and GND = 78V
CH1 - and GND = 1V
CH2 + and GND 78V
CH2 - and GND = 1V
If you monitor ch1...Leave a comment:
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Re: Vizio E470VL Orange Light/No Power
Oh, frack. The ROKU tech gave no warning 'bout that, and the set & ROKU were both new to me. He walked me through several power-down, swap, power-up conditions, but not the specifics beyond " now lets try HDMI-2"...
Whatever he said to do, I followed, power-wise. I even asked specifically what was to be powered and in what order. Rats.
I always say, you either learn to do it yourself, or you pay for not learning. This was a 'spensive lesson. Cannot wait to tell the Mrs. I told her setting up a ROKU was simpler...Leave a comment:
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Re: Vizio E470VL Orange Light/No Power
Splitcrete, I am chasing the same problem. No change from orange to white, no video, no back light, and literally no response to the power button or remote. Did you ever resolve the problem?
The power supply is up and running, and the chip under the RF shield on the mainboard is pretty warm after sitting overnight laying face down in standby. 105F by contact with the RF shield using a digital meter.
I checked all regulators, and the numbers seemed proper. The 7805 is not doing anything because it is in standby.
...Leave a comment:
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VIZIO E20VL mainboard cap right by U14 EEPROM
Title should be E420VL but my keyboard needs remedial training. So do I.
Can anyone tell me if I wiped C147 off the board when doing a replacement of the EEPROM? I cannot tell if it was ever there, and if it was, I have no idea of the value. Cannot find any parts list or schematic, so it is difficult to know if it was there or if it was, the proper value
Thanks to anyone who has this information.
I might have it in a blob of solder used to remove the old EEPROM, but it is so small that it's like searching for 1/10 grain of rice...
tom -
Re: Turn the wayback machine to 30-pin SIMMs
Simms with 30 pins? I remember 2114 individual 4k static ram chips with 16 pins. And they were expensive. And 4116 dynamic ram that could be swapped out and replaced with 4164's to quadruple the memory. I had an Atari ST that came with 512K which I bumped to 1Meg by piggybacking and running 'blue wire' CAS and RAS signals. Solder most of the pins to the original memory, and then jumper three {I think} pins that were bent upward and the wired to the GLUE chip ... maybe.
Thirty pin simms are too easy.
tomLeave a comment:
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Re: Dell E172fpb
In my case, I found that there were two places where grounds could have been connected by the case. Both were from the SMPS, one where AC line was coming in, the other further on.
Given that, after isolating those grounds, it still didn't work. Made no sense. There must be something that changes when the boards are mounted to the case.
It was one of the new C5707 hitting the shield apparently as it works now, displaying these words. I made sure to tilt it away from the slanted case, and it must have cleared as it is working fine.
Thanks for all...Leave a comment:
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Re: Dell E172fpb
I think I understand now. I can check for long legs by keeping the board, mounted to the frame, insulated by cardboard as it sits on the backside of the display panel.
There are no non-ground screws. The two spots that could qualify for that are held in place with plastic posts that spread, and must be pinched to make them let go of the board.
The large ground plane is connected directly to the display logic board with four of the ten pins. The logic board is in turn connected to the frame with bared trace on both sides of the board at the two...Leave a comment:
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Re: Dell E172fpb
selldoor said: Try mounting it in the frame with only screws in the holes with solder rings.
budm said: Just to see if it is the component's leads may be touching, put the card board under the boards than moun the boards back in, if it still goes dead, then more likely to be bad connections/solder joints, if it works with card board underneath, then you have short circuits caused by the component leads some where.
Oh boy. One suggests to only use holes where a ground connection is guaranteed{with rings}
The other suggests using...Leave a comment:
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Re: Dell E172fpb
Two pics attached?
Preview shows them, we'll see, maybe.
I'm sure I can do better, but don't have a clue as to what they'll turn out when I take them. Any hints?
There are no tall caps, all are as when I opened it up. Perhaps, likely, moved to a different spot on the board, as I removed and tested all. The 'keys' board is in a bezel that surrounds the screen, and was insulated, etc, when testing. Once I put the two boards in the case, and attach screws to hold the boards in place, it quits working. I don't think it is a torque...Last edited by tmwalsh; 07-20-2012, 08:07 AM.Leave a comment:
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Re: Dell E172fpb
I tested the transistors using a transistor test meter that I built from a kit. You hook to BCE, and press the 'test' button. A led will light up indicating "OK". It has a pot to adjust current flow, and 3 of the 4 lit the led brightly, the 4th lit the led dimly. I was assuming that its gain was not on a par with the others. The led was barely lit as I remember. It is an Elenco Electronics DT-100k transistor & diode tester.
RTECH, I flowed all the transformer pins on the board, and also where the windings are soldered to the other end of the...Leave a comment:
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Re: Dell E172fpb
budm,
I checked them as I noted, seeing a bit of movement on a DMM or VOM, and no short. As long as I don't put the inverter and logic into the metal cage and tighten down all the screws, it works.
If the 0.15uf caps were bad, wouldn't they kill the board output, and mess up the transformers output in or out of the metal shield/cage?
tomLeave a comment:
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Re: Dell E172fpb
I did check with a DMM, and got 'instantaneous' readings that quickly went to zero, making the assumption they are not shorted, and do have capacitance.
As noted, it came to life once 'out of the box', and I am now in the process of putting it back together piece by piece to see when it 'stops'. It displays the 'self check' floating display after I slid the CCFLS back into their slot and re-energized...
The board looks like your photobucket shots, but none of the caps or transistors have red racing stripes...
tomLeave a comment:
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Re: Dell E172fpb
I re-soldered all the leads on the solder side even though they looked fine. Given that, I also re-flowed all the leads on the transformers where the windings terminated.
I don't have a cap tester, but did check ESR and for a tiny reading for a flash of time on a DMM, and slight deflection on an analog VOM. All seemed good.
Everything is now out of the case, and lying on cardboard. Of course, it lit right up, and is glowing even as I type. Moving my hand over the whole megilla, feeling for hot spots, nothing is particularly hot. The smoke has not escaped...Last edited by tmwalsh; 07-19-2012, 02:39 PM.Leave a comment:
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Re: Dell E172fpb
I can't believe I read the whole thing. But I did. My brother sent me his E172FPb, which died unexpectedly one morning.
It has an almost invisible quick flash, a blink if you will, of the CCFL, and the on/off button was flashing.
I confidently replaced the C5707's, and flipped the board expecting to see ring around the transformer leads. No such luck. I read the 'trouble shooting' guide, and printed out a copy of version 3, IIRC. The fuse checked ok, and the two 9024's when measured in circuit showed nothing when checked, reading OL in the display...Leave a comment:
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Re: dv9000 won't charge or start with ac adapter
Read the label on the computer [dunno what a DV9000 is...] where it indicates the power it takes to operate & charge the battery. It should have a symbol like a large letter "C" with a small dot in the middle. The labels should indicate which is + and which is -, and the voltage supplied. Using this information, take a VOM and read the voltage on the AC adapter connection with the adapter plugged in. There should be voltage produced of the form, AC or DC, indicated on the label, and of similar voltage. Most chargers...Leave a comment:
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Re: 27 years old Brandt TV
Take the model number and cruise the WEB for problems noted. I have used Google or Yahoo groups alt.electronic.repair or similar to fish around for problems. I would also try to get a schematic. The symptoms you describe are common to power supply problems caused by failed solid state components and capacitors getting out of spec, taking IC's along for the ride. The old CTC series by RCA/GE/xx had a standby system that had a smart chip, well sort of, that would sense problems, and either try 3 times and shut down, or not even try when things were out of...Leave a comment:
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Re: Control Board Failure
Is is possible there are 'out of balance' sensors that are mounted further down in the chassis such that they were being flooded? It looks from the 1st two pictures and your diagram that the circuit was simply over loaded. Flood waters make good conductors.
C2 is totalled. Hard to say about the MPSA06. Do U4 and U7 have any connection to this power circuit? From the picture, the labelling on the top of the two IC's seems 'brownish', as if they'd been over heating.
As noted above, the cap is cheap, the transistor is cheap, and you could get...Leave a comment:
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Re: how to get rid of wifi mooches
You can stop advertising the SSID, but it is buried in the packets you send and receive...
Anyone that really wants to get in can spoof their MAC address, so that is not a real protection.
Given the noobieness of Prettygirl, I'd turn on WEP and see what happened. If you don't have any encryption not, what will it hurt? Unless you are in an area with a lot of networks, who will be looking at your WEP packets?
I am just reporting what I read on an old Microsoft web page written by one of their programmers.
...Last edited by tmwalsh; 02-27-2011, 09:41 AM.Leave a comment:
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