Vizio VP50 HDTV20A

[goggins.jim@gmail.com]

Hi everyone.. need some assistance with a Vizio which I believe is really a Samsung.. the screen appears fuzzy.. I can still see the menu however it seems to be lacking some color. Sound is fine. I've taken the back off the set and there does not appear to be any loose cables.

Caps appear to be fine looking them over.. the lower portion of the screen seems to have fuzzy black lines running through it. I'll attach a picture.. tonight I intend to check all the fuses based on what I've read on the forum..

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Update: Tested all fuses and all are fine. Picture still there but weak and fuzzy with black lines streaking somewhat across the bottom of the screen. The picture with No Signal shows the lines..

[freakaftr8]

Re: Vizio VP50 HDTV20A

Sounds like a lower ysus buffer fault

[ReeceyBurger123]

Re: Vizio VP50 HDTV20A

Possibly lower Y buffer failure. Do you have a Dmm ?

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

sounds like two possible items I can look into.. any tests I can conduct? I do have a Digital Multi Meter.. ready for next steps. Do I need to download the service manual or can you provide direction? Sure do appreciate everyones help.. I added another image.. note at toward the bottom of the screen the horizontal black streaks..

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Possibly lower Y buffer failure. Do you have a Dmm ?

I have a Digital Multi Meter.. are there tests I can perform to prove I have a Y Buffer failure?

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

O.K. I done some additional reading.. I'm going to connect a dvd player to the TV and capture a couple more pictures. Hopefully by capturing some actual TV images we can determine if I should be looking at a Y-buffer or sustain card. However if I'm reading and understanding correctly the Y-Buffer card failure can damage the Y sustain card.. am I going down the right path?

[freakaftr8]

Re: Vizio VP50 HDTV20A

Ok looking over your pictures again it may not be a buffer board however you may have a problem in your y Or z sustain. What are your voltage is coming off the power supply?. About vs voltage.

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Hello Freakaftr8.. I see you're online now. I can check voltages tonight is there a certain test point I should be looking at? I'm assuming these are all DC voltages

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

There appear to be multiple places to check the VS voltage if I'm reading this correctly I'm seeing 200 Volts DC. Vg appears to be approx. 15 Volts

[freakaftr8]

Re: Vizio VP50 HDTV20A

Those voltages sound about right. This looks like possibly a zsus issue. Can you post a picture of what the picture looks like when it's a full white screen? Also does the picture appear to be dim and washed out?

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Hello again... just got back from my daughters house where the TV is.. I attached a DVD player to her TV and captured a couple pictures. It seems like the color red is missing and I would agree the picture is somewhat washed out. I'll go back tomorrow and capture a couple more with full white. While there I did remove the Y buffer and X main boards and I could not find any sign of excessive heat or burnt parts. Both boards have been reinstalled and screen appears the same..

[tw2005]

Re: Vizio VP50 HDTV20A

Hello again... just got back from my daughters house where the TV is.. I attached a DVD player to her TV and captured a couple pictures. It seems like the color red is missing and I would agree the picture is somewhat washed out. I'll go back tomorrow and capture a couple more with full white. While there I did remove the Y buffer and X main boards and I could not find any sign of excessive heat or burnt parts. Both boards have been reinstalled and screen appears the same..

I'm going with Freak, i would look at ZSUS / XMAIN. Have you worked out whether this is Samsung or LG based? LG has those horrible IPMs. If samsung it'll be easier and cheaper if it's Z / X board.

If Samsung, check all the fuses including the small green pico fuses, samsung board picture below

[tw2005]

Re: Vizio VP50 HDTV20A

sounds like two possible items I can look into.. any tests I can conduct? I do have a Digital Multi Meter.. ready for next steps. Do I need to download the service manual or can you provide direction? Sure do appreciate everyones help.. I added another image.. note at toward the bottom of the screen the horizontal black streaks..

those black splotchy streaks are typical Xmain / zsus failure.

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Update: I have attached the white picture and also while there check the fuses.. the fuse in the attached picture shows 15V DC on one side of the fuse and approx 5V DC on the opposite side.. all other fuses have the same voltage on both sides.. could this fuse be bad and I'm picking up 5V DV from other components on one side of the fuse?

Ready for next steps... thanks again everyone for providing directions

BF= Blown Fuse
WS = White Screen
Sansung = Label

[vinceroger69]

Re: Vizio VP50 HDTV20A

take the fuse out and test the fuse what does it read on resistance mode? if your unsure of what a good fuse should read take one of the other fuses out and test it, my guess yes it bad but if it is more fault finding will be needed to see why it has blown.

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

I can certainly do that.. its the small pico fuse and I believe it's soldered in. I'll remove the board tomorrow and unsolder one end. I've looked at the cost of the xmain zsus board and it seems the price has a considerable range. I've seen from 18.00 to approx 80.00. When this board is replaced does it require any voltages to be set?

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Hello again... just got back from my daughters house where the TV is.. I attached a DVD player to her TV and captured a couple pictures. It seems like the color red is missing and I would agree the picture is somewhat washed out. I'll go back tomorrow and capture a couple more with full white. While there I did remove the Y buffer and X main boards and I could not find any sign of excessive heat or burnt parts. Both boards have been reinstalled and screen appears the same..

Here's the White Screen image

[vinceroger69]

Re: Vizio VP50 HDTV20A

sorry i didnt realise it was the small green one i didnt look at the picture to be fair just read your post yes just unsolder one side and test but a resistance reading in circuit should tell either way.

[goggins.jim@gmail.com]

Re: Vizio VP50 HDTV20A

Got pulled out of town on business this week.. will resume troubleshooting next Tuesday.. I certainly haven't given up.. just a slight delay.