Re: Vizio E321VL no signs of life.
Success, today I received a replacement board for one I purchased online and the new replacement mainboard works.
Using the resistor was a nice trick to see that the power supply could handle the load.
When I put the new board in, I only hooked up one cable at a time just to make sure if something else was killing the mainboard, I would know who the killer was. I was suspicious of the IR board so I did that one last. All plugged in and working.
Many thanks for your help.
dv
rasterdan
Rasterdan
Last Activity: 08-24-2016, 06:05 AM
Joined: 05-18-2011
Location: St. Petersburg, FL
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Re: Vizio E321VL no signs of life.
I contacted the seller and he said they had another board in stock he could send me. He also said to keep the original board for now. Very generous in my opinion.
Do you think I should install the board and only connect the power bundle first with nothing else connected and slowly start adding back the external connectors? I don't know if any of the other boards are required for the mainboard to start up.
I was thinking of only the main board and the connector going to the Visio logo for a start, then adding the display...Leave a comment:
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Re: Vizio E321VL no signs of life.
I got my power supply from shopjimmy. The mainboard I got from someone else. I have contacted them for return. I have connected the power supply connection and nothing else to the main board as a test and it still over currents the power supply. It must be bad. With nothing else connected it loads the power supply.
I will look for another one or try to fix the original. I just wish I had a schematic or sams photo fact for this TV (if they still make them ... am I dating myself?)
Thanks for all your help, I will continue this thread...Leave a comment:
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Re: Vizio E321VL no signs of life.
I pulled the two capacitors in question, both were 22um caps. My meter had one at 23.53um and the other at 23.69um. I went ahead and changed them for good measure but no change in the symptom. The power supply board will run with a resistor between 5.2V pin 1 and the middle ground pin. I ran it for 30 seconds and it ran perfectly with the resistor.
I did not have time today to go to the garage, get a couple 20ohm resistors to make a better load. But, 30 seconds or so to me would indicate the power supply board is ok. When connected...Last edited by rasterdan; 09-01-2014, 12:47 PM.Leave a comment:
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Re: Vizio E321VL no signs of life.
With everything connected and I heat the capacitors 104 and 104A on my board, 0.053VDC steady. When they cool back down the voltage jumps up and starts dropping. My meter starts registering at .5V and is quickly dropping and after a couple minutes 0.05v.
With a 10 ohm resistor, 5.20VDC and heating brings it up to 5.24VDC. I could not run this very long because my quarter watt resistor was getting hot. It was the only size that would fit in the connector and for a short test it was ok to get hot. I have plenty more.Leave a comment:
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Re: Vizio E321VL no signs of life.
Actually it is creeping down and not up. Is the start up cap the big electrolytic or is it a ceramic, one of the little guys by what are probably the regulators?
The thing that is bugging me is I bought a new set of boards just to have the exact problem with any combination of the boards. Maybe someone sent me a bad board with the same problem as the one i have. Not likely but I have certainly got bad boards our of our stock, had 3 in a row but they were all bad in the same way and pulled one off the production line and presto....Leave a comment:
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Re: Vizio E321VL no signs of life.
Immediately after plugging in the power cord, the visio light goes to orange for about 200ms. So ... flash on then off. The meter jups up and doesn't have time to read the voltage because it is falling very fast. Within 60 seconds the meter reads 0.110VDC and a minute later was 0.090VDC.
If I remove the connector the power starts creeping up but if I unplug the tv and replug it back into the wall, then the power jumps back to 5.23VDC and remains steady.
I replaced the tuner board/mainboard and it does exactly the...Leave a comment:
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Re: Vizio E321VL no signs of life.
Is it possible that one or both of the boards I received are bad in the same way as the one in my tv? How to tell? .... anybody?Leave a comment:
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Re: Vizio E321VL no signs of life.
I have disconnected the IR cable. No change. I removed the IR board and it looks like new. Disconnecting the board but leaving the cable is of no advantage since the cable is off at the main board. Still only flashes the Visio for half a second then a click can be heard and nothing. No signs of life.
You would think that by unloading the backlight that might allow the system to power up. The only thing that I have noticed is that if I unplug the wire bundle going between the power supply and the main board from either end allows the...Leave a comment:
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Re: Vizio E321VL no signs of life.
Had a read through that but ordered the main board because I needed to get this going. Well, no luck. ... or not much. Now I have replaced the power supply and the main video board. The Visio light flashes on for less than a second when power is applied to the power connector then goes off. No DC power can be measured.
I attempted disconnecting the cables one at a time with power off to see if I could identify a problem component dragging the system down but no change. I suppose it is possible that one of the boards that I received...Leave a comment:
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Re: Vizio E321VL no signs of life.
Sorry, I could not find my camera and my phone takes lousy photos. Attached are requested photos. The power supply is a replacement but both look identical and none of the caps appear to be blown. I know what they look like when bad. I have changed about 50 over the past few years fixing LCD monitors.
Thanks for having a look. I was hoping to find a way to measure something with my meter to confirm the bad board or jump something to kick start the power supply. I have an analog scope if that helps.
dv...Leave a comment:
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Vizio E321VL no signs of life.
I read through some of the other E321VL posts but this failure mode is slightly different. I have AC power going into the power supply but no DC power from the power supply. If I disconnect the cable going to the main board from the power supply, the standby 5.3V power can be measured on those pins labeled 5.3VDC but no 12VDC is ever measured.
I saw on a different model where you could jumper the power supply to kick it on for testing but did not see any jumpers labeled the same on my board.
I replaced the power supply thinking that I have AC going in but nothing... -
Re: Hannspree HF257 w/bad backlight
After changing the caps, the board was still not functioning properly. Recently I was Christmas shopping online and searched eBay for the power supply number and finally got a hit.
You can purchase an almost identical board on eBay for $34 - free shipping. Search by your board part number and you will find one one digit different (the board is for a HH251). I looked at it and it looked exactly like mine. I ordered it and it looks exactly the same and ... it works perfectly.
FSP060-2P109
eBay store "monitor-0...Leave a comment:
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Re: Hannspree HF257 w/bad backlight
Replacing the caps (even though they looked ok) solved the 12v problem. I still had the 2 second to black.
I pulled the inverter transformers and they measured both the same and very close to what the generic replacement said their values were so I am assuming they are ok. I can unplug the back light and the power supply still shuts down.
I believe it is a bad surface mounted Current Mode PWM controller. It seems to have the same voltage and wave form coming out of every pin except ground. The DVM also has every pin about...Leave a comment:
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Hannspree HF257 w/bad backlight
I have a Hannspree HF257 25" display that goes black after a couple seconds. After reading many posts, I replaced all of the caps on the board even though the cans did not looked popped on top. I also replaced the 12 v voltage regulator for good measure since the 12 v would shut down after a couple seconds. One of my friends said that was because it was probably in over current and it is one of those non-breakable regulators with a safety built in.
So, all the caps and regulator replaced, still have the same problem. I can see with a flashlight that the display is working,...
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