Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thanks, Nick. I certainly will. My board delivery was delayed so I’m hoping to get it tonight or Monday at the latest.

Have you ever experienced what brucetv just described? Meaning, with the 65” P652ui-B2 model, specifically, has it ever turned out to be a bad panel when it’s displaying my same symptoms (especially the half-picture)? Just trying to reason whether a bad panel on this particular set can actually result in only half the picture arriving on screen. Seems like a bad panel would more likely affect the entire screen, or a more defined segment of the overall screen (as opposed to half and half).

(Same question for you, bruce, if you read this over. Thanks.)

~ kca

[Nick's Tvs]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

KCA we just got another P652ui-B2 walk into the shop today, and sure enough same symptoms as yours. What sully stated is all correct however. I wouldn't worry about that cap to much. Let the community know how your new main board instal goes. We shall do the same.

[brucetv]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I'm thinking bad panel. I see a lot of bad panels in the P series Vizio's which sucks because you pay more for them and then they put shit panels in them. Especially the P-502Ui-B2 and the P602Ui-B2. We had a Vizio P652Ui-B2 in last week and same problem...bad panel....what a joke Vizio oh ohhhhhh...pitiful...Lucky to get 2 years out of them. The Mexico plant is spewing out tons of them...pure crap.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thanks for the detailed explanation, Sully.

I'll go with the 1uF then and monitor the outcome closely. Good to know that it might even work without a cap in place, just for future knowledge.

Appreciate it. Have a great day!

~ kca

[Sully805]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

KCA,

You might be lucky and have noting what so ever in parallel with that capacitor, and be able to measure the capacitance while in circuit, however I 99% doubt nothing is in parallel with it. You most likely can install your new main without replacing the cap and still get picture. A lot of these circuit boards have redundancies, but yes based on the fact that you got .94 reading off the original. Most components for low grade electronics such as TV's have a 5% tolerance out of the factory, so if its between 0.95 and 1.05 its good enough to work in your set. You might have gotten .94 because the measuring tool used was slightly inaccurate, and or simply because the cap is a few years old, or a bit of both.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thanks for the feedback on this, Sully. Can I ask if you’re basing this on the .94 reading I got off of the dismounted cap, or on some other experience/ knowledge you have?

I’m still waiting for the main board to arrive in the mail, but have been leaning toward the 1uF cap solution as well.

[I also decided a couple days ago to order a capacitance meter, but since it’s coming from Hong Kong it might not get here for another 10-20 days. The other helpful piece of this puzzle is that there is a “quasi-mirror image” cap on the other side of the set that I’m almost 100% sure is the “match” for C114. But, I don’t want to take that SMD off the board to measure its value unless I absolutely have to. Is there a way to get any kind of accurate reading of capacitance without removing these SMD’s, either with a regular Digital Multimeter or (more realistically) with the capacitance meter itself when it arrives in December?]

[Sully805]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

place a 1uf cap back on

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Hello Nick ~

Just wondering if you had a chance to read my last post (#118) and have any ideas re: the uF value of C114 on the lower-left panel board.

I'm nervous about putting in the wrong value cap and doing any kind of damage to this set. Hoping you, or anyone else, has a way of confirming the C114 value.


Note: I had the C114 cap I took off the board tested at a local electronics shop and it turned up a reading of .94. This would lead me to think that it's a 1uF, but if it's faulty then it might well be a 2.2uF or even a 4.7 uF and just giving a very low reading. I covered this back in Post #93 in this thread if you want or need to go back and look at that set of messages.

Hoping maybe someone has access to either a test set or the information regarding C114 via a service manual for the Vizio P652ui-B2.

Thank you in advance for any help you can provide.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thanks, Nick ~

{I’ll call you Nick, even though I’m not sure that’s actually you. }.

I’m wondering if you could help me decipher something. Do you have a capacitance meter and could you measure the C114 cap that rests on the bottom left-hand side panel driver board? Of course, I’m assuming you have a Vizio P652ui-B2 in the shop at this time, which you may or may not.

I’ve got all three values of ceramic SMD cap (the 1uF, the 2.2uF, and the 4.7uF) at the ready, but I’m not sure which one is the true and accurate replacement for the cap I took off the board at location C114 a couple of weeks ago. It is an 0805 package capacitor. It's also possible that it is a different value cap than any of the three I just mentioned, but others on this board recommended that it is very likely one of these three.

I’d really like to use the absolute correct value with the new Digital Main Board that is coming in the mail (probably tomorrow). Can’t really afford to make a mistake now being so close to the end.

If you don’t have a P652ui-B2 there in the shop right now, perhaps you’d have access to the Vizio Service Manual for this exact model. I have scoured the Internet for several hours trying to find it on my own with no luck or progress.

I’ve included 3 pics below to help you visualize exactly where this C114 cap rests on the lower left-hand panel board (as viewed from the back of the set).

Thanks, in advance, for whatever you might be able to do.

[Nick's Tvs]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

The light fading away is normal when the TV is plugged back in for the first time after being disconnected from power. It doesn't seem like it on the users end because this only occurs when the TV is first plugged in. Most people don't disconnect their TV from power every day, so they never see that light fading away that way.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

My LED power light indicator (white, in the lower-left hand corner of the set) does come on and does a very quick fade of less than a second and does so about 8 seconds in. Not sure if it’s fading as much as it is simply turning itself off. So, very similar if not the same to yours. This is after I hit the power button on the remote.

You may have purchased a bad main. Hard to tell. I think it could be in the panel boards down at the bottom b/c if any of the SMD’s are faulty down there then it may be denying the picture. Could also be the ribbon connectors, though this is less likely yet.

You are saying that there is no picture whatsoever, though, right? Different than mine which is a half + half picture issue and one that only appears on very intermittent occasion. I have hope that the Digital Main Board might well be the fix for mine because I am getting the half picture to appear and that it is nearly flawless when it does.

I’ll let the rep from Nick’s TVs and/or others answer, as they are still likely more insightful than I am at this juncture.

I will post again after I try my new Digital Main Board, and that will give you some further insight into what may be happening with yours.

[brandx34]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I just wanted to clarify but the eeproms on these main boards in our experience have never failed. They will NOT be the source of your failure for the symptoms you are experiencing. Replacing the eeprom will NOT fix your board since the eeproms on these boards do not fail. They are in our experience always fully functional. The failure is due to other parts of the module malfunctioning. I was just suggesting to avoid buying repair kits for these boards as several retailers sell them, but they will not fix your problems.

Per our experience of seeing more than 5 of these of all different sizes with the exact same symptoms you have, we have always fixed them with main board replacements.

If you are skeptical, or unsure of the sellers, just make sure you purchase a main board with a return policy.

In your experience with this line, are one of the symptoms a fading power indicator upon startup? Comes on with power up, but then fades after about 8 secs?
I have a p502ui-b1e that I have changed every board, but to no avail...same symptoms as orginal post. No video, had sound. Changed, tcon, main, psu and led driver...thinking I may have purchased a bad main now?
Any insight?
TIA

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Good to know. Thank you. I figured it was probably okay as these axial leads suffer through much higher temps on other boards than they are likely to experience on this lower-left hand corner panel board.

Thanks to everyone who has helped me so far. I’ll update this again when I get the new Main Board in and give it a try. Still not quite sure which value cap to use for the C114 SMD capacitor, but I’ll try the 2.2uF first and see what happens.

[budm]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

"budm ~ I have a question for you. Assuming I get the full screen picture after I put the new Main Board in, do you think it is safe for me to just leave the small piece of axial leg on R009 as opposed to trying to get an actual 0 Ohm resistor back on there? " That will be fine to leave the jumper wire in place.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Well, bought the Main Board after the company confirmed that it should work.


budm ~ I have a question for you. Assuming I get the full screen picture after I put the new Main Board in, do you think it is safe for me to just leave the small piece of axial leg on R009 as opposed to trying to get an actual 0 Ohm resistor back on there?

I don't think I'll have any real problem replacing the 0802 cap labeled C114 with one of those I already purchased at the local electronics store. It's big enough for me to easily manipulate.

But the 0 Ohm (0402 package) resistor is so small that I'd rather just leave the SMD situation as it is with this small piece of axial metal working as a conductor if it's safe to do so in the long run. Is overheating over time an issue if I leave it in place? If need be, I can attempt to replace it with the correct SMD resistor.


I've included an image below of the way it looks right now.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I understand now re: the eeprom. Thanks for the clarification.

Good to know you've had success with 5 or more. That is good enough for me.


I found a replacement Main Board online and here are the details:

791.00D10.0001 Vizio TV Module, main board, 748.00606.001M, P652UIB2, P652UI-B2
Your Price: $84.24

Quantity in Stock:1
Availability: Ships Same Business Day by 4PM EST
Product Code: 791.00D10.0001


Is the $84.24 a good price, in your opinion, or is there a way I can get that more inexpensively?


I have already written to the company about a small, but may be important(?), discrepancy between their worded listing and the photo they've posted (see link below).

I'd like to know your opinion if this is important or not.

Their worded listing reads 748.00606.001M, as you can see up above b/c I copied and pasted that information here, but their photo actually shows a board that reads 748.00602.001M.

The board I am replacing also reads 748.00606.001M, with the 606 designation, as you can see from the photo of it I've posted below.

Does that matter at all, in your experience? I'm thinking it probably does not make much of a difference but would feel better about making the purchase if I'm sure. Here is the link to the website where I found the potential replacement part:

https://www.tvpartstoday.com/791-00D...00d10.0001.htm

[Nick's Tvs]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

I just wanted to clarify but the eeproms on these main boards in our experience have never failed. They will NOT be the source of your failure for the symptoms you are experiencing. Replacing the eeprom will NOT fix your board since the eeproms on these boards do not fail. They are in our experience always fully functional. The failure is due to other parts of the module malfunctioning. I was just suggesting to avoid buying repair kits for these boards as several retailers sell them, but they will not fix your problems.

Per our experience of seeing more than 5 of these of all different sizes with the exact same symptoms you have, we have always fixed them with main board replacements.

If you are skeptical, or unsure of the sellers, just make sure you purchase a main board with a return policy.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Thank you VERY much for the feedback!

I greatly appreciate it. Really good to know that you have had successful experiences repairing this with a new and working Main Board.

I've been debating for the last couple of days if it could be originating in the Main Board, since the T-con I bought from China did nothing to change things and my SMD work trials on the panel board has also not had any effect.

So, can I ask what your success rate is with the 65" model after you put in a new Digital Main Board? Or, alternatively, how many have you been able to fix and have those only required the replacement of the Main Board and nothing else? Also, did some or all of the 65" sets you worked on have the intermittent pattern with the backlights that mine does, where they remain off about 95% of the time and then come on at very random and unexpected intervals?

I will buy a new Main Board, per your suggestion, and not mess around with the eeprom. But just for my own knowledge, is it the eeprom that is the only defective component that's causing this situation?

Note: If you look up at Post #104, I illustrated an IC chip on the lower panel board that I thought might be the cause of the problem. Do you think I can rule that out and just focus on getting the replacement Digital Main Board instead?

Thanks in advance for your reply.

~ kca

[Nick's Tvs]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

You have a faulty main board!

The symptoms of turning on with no picture or backlight is common for the following models:
P502ui-B1
P502ui-B1E
P552ui-B2
P652ui-B2

The symptoms of the half screen showing discoloration such as what you have been experiencing is also a main board however we have not seen that symptoms with the 50 inch version, only with the 55 and 65 inch models.

I do want to point out however that you will never fix these boards with an eeprom replacement. Not sure why some companies out there sell the eeproms, but don't wast your money on those, we already have.

We have had several of these TVs come in to our store front location, and have never seen these with anything but bad main boards with the symptoms you are experiencing.

[kca]

Re: Vizio P-Series 4K tv with temporary sound and no picture P652ui-B2

Don't think I ever posted a video of the half-screen issue for this 65" Vizio, so below is a link to show others what it looks like. Tv was upside down when I shot this, so it may look a bit disorienting, but it makes clear what the "white / pink / green" side of the screen looks like when it periodically appears. Video also shows the working half side in operation.

https://youtu.be/vTGLIS4jtpk

Hoping that it might trigger someone's recollection about a similar issue they solved or have insight into.

Thanks much ~

kca