VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

[Hiatsu2k8]

Hello All!

When I got the television it was not powering on and the person told me that they heard a loud pop and then it turned off. This person replaced the fuse but it kept blowing. Once I had the television I confirmed that, yes the fuse was blowing whenever it was replaced. There was no standby light and the replacement power board was not expensive so I opted for a replacement immediately. Link to image of original board is attached.

Once the new board was installed the fuse no longer blew but I was still not getting a standby light. Putting the meter up to the 3.3v on pin one shows 3.33v which I'm assuming is the stanby voltage. This may be my problem but there are no other indications of where to test for stanby voltage. When testing pins 14, 9, 8, and, 4 they all read what they're supposed to read. I've attempted shorting pin 3 to pin 1 pin 4 and pins 8 and 9 to force the television on but I get nothing. I've also shorted pin 11 to pin 12 and the back lights flash on and off over and over. I've replaced this board with 3 others with the same results. I've also replaced the main board with no success. Every time no standby light. To be honest I'm a little in experienced when it comes to advanced testing so any help would be appreciated. Thanks!

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

What voltage do you get on Pin 10 (Backlight Error)?

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

What voltage do you get on Pin 10 (Backlight Error)?

It bounces from 1.9 to 2.4 very quickly. That's with no jumpers.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

It looks as though you have a faulty led(s).
Can you measue the led voltages at the connector (picture fuzzy so cannot see the number) and post them. Suspect at switch on they are high and then fall.

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

It looks as though you have a faulty led(s).
Can you measue the led voltages at the connector (picture fuzzy so cannot see the number) and post them. Suspect at switch on they are high and then fall.

To do this I should test pin 12 or 11? Or am I testing the other connection on the bottom left. I'm assuming it's the pins that read VLED 1-2- etc... I'll check them and get back to you while I'm waiting for a reply. Concerning "switch on", must I short PS-ON pin 3 to "switch on"?

Thanks

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

I don't think you have a problem with the main board so reconnect everything and check the voltages where it says VLed1,2,3 etc. Switch on and see if the voltage goes high and then drops low. Set meter to 200V dc.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

It bounces from 1.9 to 2.4 very quickly. That's with no jumpers.

If the voltage on this pin is bouncing then you have a backlight problem.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Also check the 4 diodes alongside with your meter set to "diode" check.

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Also check the 4 diodes alongside with your meter set to "diode" check.

I don't think you have a problem with the main board so reconnect everything and check the voltages where it says VLed1,2,3 etc. Switch on and see if the voltage goes high and then drops low. Set meter to 200V dc.

All 4 diodes read around .43V with Negative on the silver side and OL when switched. Am assuming this is correct that it's because they are allowing current through one way but not as much through the other? This makes me think they are working correctly.

Concerning reading the other pins, I was already fairly sure that the back lights were the issue now I'm trying to understand why. The labels are confusing me when they say VLED 1-2- and 1-2+ does that mean I need to use the positive on 1-2+ and negative on 1-2-? Or is it just a positive lead on each pin and negative on ground? Or is the 1-2- just lead to ground anyway?

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

If you can read them with the negative lead on the chassis and use positive pin to take the readings.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Here's a video to help you.

https://www.youtube.com/watch?v=ihBE...8TwwMjA1MjAxNg

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Here's a video to help you.

https://www.youtube.com/watch?v=ihBE...8TwwMjA1MjAxNg

Thanks for all your help. I'm not too worried about the, actual, back light portion of the repair. I'm concerned about getting the panel and other parts out without damaging them. Oh well I guess we shall see.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

You haven't said what the readings were? Could be helpful to others who have the same fault.

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

You haven't said what the readings were? Could be helpful to others who have the same fault.

Each pin was right around 5v. They would fluctuate between 3.5 to 6v up and down. A couple of pins were steady at 5. What was more confusing was on certain parts of the chassis I got fluctuating readings but they were much higher, in the 100s. I had the ps-on pin shorted to the 3.3v while I did this.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Disconnect all the led connections and measure the voltage at switch on between the edge connectors and chassis. I would expect an intial voltage of 150 - 200V at switch on and then a sudden drop.

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Disconnect all the led connections and measure the voltage at switch on between the edge connectors and chassis. I would expect an intial voltage of 150 - 200V at switch on and then a sudden drop.

I tried disconnecting the leds but the probe isn't small enough to get a reading from the cable connecting the lights to the power board. Anyway, at switch on, which was me just plugging in television in to a power source with the ps-on pin jumped to 3.3v, it certainly does spike to 380 volts and then jumps down to 100+ volts and repeats for a few seconds. Then it remains steady around 3-6 volts and does nothing else. I will be purchasing the back lights in the next few days. However, I'm still concerned about removing the panel. I've fixed a lot of phones and tore down the lcds. They are very similar to the one television panel I've removed and I'm not so sure I'll be able to get the whole thing apart and back together without causing additional damage to the panel components. But who cares.

[Electronic Handyman]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

If you look on youtube you can find helpful videos regarding changing leds on sets.It might help you a lot to watch a few vids first.Having a good clean area to lay down the screen and the other parts is vital and keeping them in order they came out helps too.You may not need to change all the leds and sets work fine even with a couple of leds that are bypassed.

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

Are the 4 diodes connected to the led output connector which would be an easy point to connect your meter to.
Also didn't the video show that if the voltage was steady without the leds connected then it was likely to be a led fault. You say it drops to 100V and was that steady at the four Led+ connections. However again with the leds disconnected if the voltage dropped to a low voltage then it was more likely to be a fault on the power supply?

[dick_barton]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

I tried disconnecting the leds but the probe isn't small enough to get a reading from the cable connecting the lights to the power board.

With the leds connectors removed it is the connector on the power supply board which you need to measure not the cable.

[Hiatsu2k8]

Re: VIZIO e601i-a3 No Stby Light but Stby Voltage Good.

With the leds connectors removed it is the connector on the power supply board which you need to measure not the cable.

I installed lights and it did the same thing. In the end I gutted the unit and tossed it. I was sick of dealing with it. I replaced the leds, psu, and main board and nothing changed. I was having the same issue as before, either it was not the lights or the lights I received were bad. Either way, I tossed the f****r.