Vizio JV50p - Turns on then clicks off - No audio or picture

[tester_matt]

Thanks in advance for all the help...

After reading the HOW TO guides I have removed all connections and isolated just the power board. When I plug it in it turns on then off automatically. I looked at the caps and many were bulging so I order a replacement package and did all of them versus just the 4 that were obviously bad. The unit still does not work and I do not get the proper reading on VA or VS? Any ideas...

[nomoresonys]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

can you post some good clear pics. of each board and one of how they all connect together?, you know what they say, a pic. is worth a thousand words. careful when working with power supply HIGH VOLTAGE on primary side.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Here is some pics..

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Let me know if you need more detailed pics. I show the BAD CAPS I replaced and the overall pic from the back view.

The picture named "LIGHT" - This card has 4 lights on it named D5, D4, D3, D2

When the system tried to power on they light up for a couple seconds on everything except for D2.

[nomoresonys]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

not too familiar with plasmas, maybe look the power supply over real good, check anything labeled F, F=fuse, check with multimeter on diode mode, should read 000 or close to it, check all the fuses you find on the boards.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Thx for the replies Sony. I tested all fuses first and they are all fine. I will eventually figure it out and will post my findings to help the next person. Thanks again and hopefully someone else may have some advice. I read up on LDO but very familiar so I am gonna do some homework. Just confused as to why va and vs readings are. I am to test when powered but how when it powers itself off?

Matt

[tw2005]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

It's possible that the IPMs on either the ysus or Zsus are blown and it's going into protection. Maybe try removing the power lead from the Ysus and see if it stays on or not and / or recheck voltages.

[MagicSmoke]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

When you say replaced all caps, how many were in the kit? That PSU looks a lot like mine in a Vizio I have w/ LG panel and boards.

If the P/N is AAX30284301 Then there are about 25 caps to replace. That's not counting the ones over 100 volts.

Its the very small ones that can keep it from powering on.

Edit... If that is the same p/n PSU as mine I can help you test which voltages are supposed to be present when only plugged in and not turned on. And where they are supposed to be tested from.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Thanks for the reply TW2005. I did that first when troubleshooting the power board when reading about the Z and Y cards being a common problem. When the tv is powered on I see the lower VISIO logo turn white but no picture. I let is sit for 1 hour and there was no heat coming from either side on the heat sinks. Cold..Cold.

After disconnecting all cables except for power source which measured correctly (110) I powered on the TV and I hear a click within 5 seconds turning itself off.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Thanks for the reply MagicSmoke..

I purchased a capacitor replacement kit from lcd alternatives. There is 18 or 19 caps I think.

Maybe I am testing the VA and VS incorrectly. I am trying to test when the unit is powered up but as it turns off automatically it is difficult. I will try your method above of testing with power cord plugged in so the board is getting the power and then test and see what my reading are. According to the SPECS it should be VA60 and VS193

I also noticed when taking the board out that it had been worked on previously. I asked my brother who is the original TV owner and he said that at one time a service tech had come out and installed a new board but that was all. He said it worked great for another 3 years then just died. I am taking this on as a little side project and only in $18 dollars so far..

I will post my readings shortly..

Matt

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Checked and readings were (Zero) on both VA and VS with the unit plugged in but turned off.

BOARD = YPSU-J013A PN:AAX30284301 (Match to yours)

Please let me know how to test and I will try again. Perhaps I am testing incorrectly?

I am connecting to VA and the other to GROUND (Tried to chassis and terminal labeled GRND)

I am connecting to VS and the other to GROUND (Tried to chassis and terminal labeled GRND)

Voltage (DC)

Matt

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Running to the store to get a new 9v battery for my tester. That is one thing I have not checked and is an easy way to rule out my tester.

[nomoresonys]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Thanks in advance for all the help...

After reading the HOW TO guides I have removed all connections and isolated just the power board. When I plug it in it turns on then off automatically. I looked at the caps and many were bulging so I order a replacement package and did all of them versus just the 4 that were obviously bad. The unit still does not work and I do not get the proper reading on VA or VS? Any ideas...

you should at least replace all the caps in that area, they dont have to bulge to be bad.

[MagicSmoke]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Be VERY careful when probing test points. Some of the voltages on the board can kill. Also don't slip and short something out. (don't ask)


Alright, first test... disconnect cables at CN805 & 806, these power the Y board, leave or reconnect the other 4 cables to mainboard and switch assy.

Set meter for 20v, plug in AC cord. PSU will make one loud click within 5 seconds, it will then click again within 10-15 seconds. It will now be in STBY mode. LED on frt of tv should be on, (unsure of color, mine turns orange in STBY).

If yours does not click twice then there might be other caps to replace.

If it clicks twice then check w ground on chassis, red to 5vsb on connector P800 should be a brown wire. Needs to read at least 4.8v to 5.2v.

Next go to connector CN805 and check bottom 2 pins for 5vctl.

Then check CN 807 towards the bottom left on the top 3 pins for 3.3vsc.

Next on bottom of board connectors CN 802 should have 24v.

CN 803 should have 5v and 12v and CN 804 should have 9v.

ALL of these readings are before trying to turn on the tv, so no VA or VS yet.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Sorry for the delay....

I followed your instructions and disconnected the Y connectors from the PSU. This time when I plugged in the TV I heard nothing. I did not get the normal click on and then off within seconds.

I looked at the front and the VISIO logo was on showing the amber color (standby).

Tests:

5vsb on connector P800 = 4.9 on first startup

CN805 and check bottom 2 pins for 5vctl = .01/.00 (nothing)

CN 807 towards the bottom left on the top 3 pins for 3.3vsc = .01/.00 (nothing)

CN 802 should have 24v = .01/00 (nothing)

CN 803 should have 5v and 12v and CN 804 should have 9v = All .01/.00 (nothing)

I think I should pull the board and take a closer look at all the solder connections under a scope. I must be overlooking something here..

When testing the 5vsb on connector P800 = 7.1 and climbing after running for 5 minutes

[MagicSmoke]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

If 9v, 12v and 24v are missing there may be other problems than caps.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Thanks Magic..

I will try and take a look tomorrow after work. It is a long day so I will more than likely post my findings, if anything Wednesday.

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Well, I have fixed my first TV!!

I decided to take a close look at all the connections/solder to see if anything stood out. It didn't take long and right there in front of me was a broken solder for a part that I had not worked on. I was thinking it was the capacitors due to the bad caps and did not check the rest of the components as the bad caps stood out.

It is a learning experience and I am glad I found this forum for the extra guidance.

I have attached a picture of the bad_solder and the fix. I am not sure what the purple component is (maybe a capacitor due C865 label) but that was causing the problem due to open circuit.

Rookie mistake but a great side project to learn a little. Good news is the capacitor kit I used will save me the headache later on as majority of the caps are now new.

Thanks again Magic and Sony for lending a hand.

HAPPY NEW YEAR!

[tester_matt]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Everything was working fine and I decided to review the menu and make some changes to the picture. There was an option under menu for white reset. I choose this and the screen turned white and could hear a humming sound. It was doing a calibration for white I assumed and it was going on over a minute. I started googling with my phone to see if this was normal time frame when the unit turned off an I can smell burning electrical.

Lol- guess I shouldn't have done that? Will pull apart tomorrow, curious as to what failed now.

[MagicSmoke]

Re: Vizio JV50p - Turns on then clicks off - No audio or picture

Check the area around that cap you re soldered, it looks like that pin was getting hot.

The white screen cleaner pulls the most amps from PSU so weak parts will fail.