Vizio jv50p hdtv 10a

[BanditXX]

After much research over the past week or so I decided to register and post to this site/forum because it kept coming up in my internet searches. You have created an excellent source of information and I wish add to your collection.

My folks handed over this TV to me because it stopped working properly; they purchased a new TV to solve their problem. From conversations the problems appear intermittent and the set initially lost audio and then both audio and video. I've been monitoring the TV for a few weeks and noticed the following initial indications:

1. When it does turn on, the right front speaker does not work (I used the speaker set up that emits a tone from the Menu)

2. When it does not turn on...
a) the amber VIZIO light turns white
b) there is a sound of relays that click
c) the screen appears to backlight
d) after 5 seconds or so there is a strange "whiz" or "zap" sound
e) I believe the panel remains backlit

This appears to be intermittent because when the set turns on, it works pretty good (see note2 below). For now I'm testing with coaxial cable input and RGB input from my laptop.

The other day I removed the back panel and noticed some burn/score marks on the backside of the thin, metal back panel about 10 inches from the top and centered horizontally. This area corresponds with the Power Supply #EAX322441201 (30360601/6) with a manufacture date of 2006.12.15.

I immediately noted a number of bloated caps, most of which did have a small amount electrolyte residue on top. These are the same samwha (WB) caps that appear throughout a number of your forums, but I do not recall seeing these specific ones being mentioned: 3300uF 10V M. Additionally, there was a significant amount of dust inside the set.

There were no apparent other signs (sight & smell) and all plug connections were snug.

Regretfully, for now, I did not take any initial voltage measurements on the Power Supply because I'm convinced these caps need to be replaced (9 in total w/same specs) based on my research. Once I replace them I will power up and take readings regardless of whether or not the TV works properly. This may, or may not, be a misstep depending upon whether or not the Power Supply is the problem or a symptom of a problem.

Today I unsoldered the caps and I am now looking for suitable replacements of high(er) quality. After researching capacitors at various distributors I think I have identified decent replacements, but I would like to see the datasheet on the samwha caps first; I can't find it anywhere.

Will be happy to purchase from the BadCaps store. These are the replacements that I believe will work based on manufacturer datasheets:

1. Nichicon UPM1A332MHD
2. United Chemi-Con EKY100E__332MK25S

BadCap specs:
3300uf
10V
105degC
(M)
samwha WB
backside label: U9A
25mm X 12.5mm (approx) 1" x 1/2" using measuring tape

These caps are labeled on the Power Supply as C201, C202, C203, C227, C271, C272, C281, C282, and C283.

Do you have the datasheet for these caps?
Can you provide some guidance on appropriate replacements?

Also, I did snap a few pics, but my camera battery is now dead. If there is interest in this thread I will post them in a few days.

note1: this Power Supply is riddled with additional samwha caps of various specs...hopefully I won't have to replace them all

note2: Intermittent Audio - I found that I can get the right front speaker to work properly by unplugging the power cord, holding the on/off switch for 30+ seconds, plugging in the power cord and then turning the TV back on

[retiredcaps]

Re: Vizio jv50p hdtv 10a

samwha WB

Do you have the datasheet for these caps?
Can you provide some guidance on appropriate replacements?

1) WB is the series. So searching for "samwha WB", your very first search result back is



2) PCBONEZ will me if I don't explain that when replacing caps, you want the same or more ripple and the same or less ESR (ohms) as per

https://www.badcaps.net/forum/showpo...47&postcount=3

3) As for choosing a low ESR series, there are a number to choose from at

https://www.badcaps.net/forum/showthread.php?t=2280

Pick one series that meets the criteria as explained by PCBONEZ.

Hint: Panasonic FR and/or FM might be a good match to WB. For example,

Samwha WB 3300uF 10V = 18 mOhm, 2770 ripple
Panasonic FM 3300uF 10V = 15 mOhm, 3190 ripple

4) Repeat the same check for each capacitor.

[retiredcaps]

Re: Vizio jv50p hdtv 10a

note1: this Power Supply is riddled with additional samwha caps of various specs...hopefully I won't have to replace them all

5) Members here generally recommend replacing them all especially if they are the same brand caps that went bad originally. One member here likes to say "guilt by association". So those other Samwha caps have been baking in heat for 5 years and could have possibly dried up.

Remember these big TVs run temperature hot since they don't have active cooling fans. Capacitors die from age, heat, and shoddy build quality. Capacitors DO NOT have to be visibly bloated in order to bad. They can be out of tolerance uF (a 1000uF measures 20uF) and/or have high ESR (ohm). A multimeter will be insufficient to test for ESR. For that you need an ESR tester which costs between $50 and $300.

For a 50 inch plasma TV, I suggest it is worth the extra $5 to $10 in caps to get a few more years life. You can still get a good picture with 1080i.

6) Until you get the replacement caps, I suggest you leave the set unplugged and not run anymore tests. By leaving the bad caps in there, they could be causing possible damage to other very expensive or non user repairable components.

[PlainBill]

Re: Vizio jv50p hdtv 10a

Samwha has a reputation for bad production lots of capacitors. The 3300uF, 10V is one that shows up bad in a number of cases. Definitely replace ALL of them.

Quick results - neither of the caps you identified will work - the ripple current is too low.

PlainBill

[BanditXX]

Re: Vizio jv50p hdtv 10a

Thank you both for your insight. Let's see if I got this right....

1) when replacing caps ensure same capacitance, but greater than or equal to ripple current and less than or equal to impedance <--- is this true in all cases, or primarily for power supplies?

2) since the samwha caps are "known" bads (both in forums and on my power supply) it makes good sense to recap the entire board.


Well, now it's just a matter of ordering and replacing these caps. Once again thank you.

[retiredcaps]

Re: Vizio jv50p hdtv 10a

1) when replacing caps ensure same capacitance, but greater than or equal to ripple current and less than or equal to impedance <--- is this true in all cases, or primarily for power supplies?

True for all.