Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

[PohTayToez]

The TV was completely dead at first, and when I opened it up there were several blown caps. In the picture you will see 10 blue capacitors, those are the new ones. After replacing those the TV now turns on and functions normally however the picture appears faded/washed out. Turning the brightness up or down seems to do nothing at all.

I actually just now, while writing this and uploading pictures, noticed that there is a single cap on the main board that is the same as those that I replaced on the power board. I have one of these, which I learned after buying it apparently isn't very useful for testing capacitors. Would I be able to get an accurate measurment in this case? I set it on 2000uF (the cap is 25v 1000uf) and hooked it up, it started reading at just under 400 and slowly increased until it evened out around 530.

Also here are the readings off of the power board:
BON = 4.66v
PWM = 3.39v
GND = -0.01v
12V = 12.13v
32V = 0.00v
5VZ = 5.00v
5VS = 5.00v
PON = 4.52v

[tom66]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Please list the brand and series of the capacitors used for replacement. Inadequate capacitors can cause a variety of symptoms.

[PohTayToez]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Damn, didn't think about the new ones being bad.

Here is a pic of one of the replacement capacitors.

[tom66]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Ugh, wouldn't touch them with a ten-foot pole. Never heard of them, so I do not trust them.

[retiredcaps]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Damn, didn't think about the new ones being bad.

You live in the USA with access to reputable distributors like digikey, mouser, badcaps.net, etc. With digikey, USPS 1st class shipping will be around $3 for caps and you get it within 2-3 days.

Why deal with capacitors on ebay when 95%+ are fake?

Just get Panansonic low ESR FR, FM and FC series.

[MisterD]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

I wonder why the 32V is not present?

[tom66]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

That is analog tuner voltage, may not be present if it only has digital tuner.

[PohTayToez]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Hey so I'm a bit of a newbie, and a little lost on how to order from Digikey. I assume these are aluminum capacitors, right? Do I order off of the product index? I don't know what I need outside of capacitance and voltage. The options for ripple current, ESR, impedence, etc have me completely lost.

[retiredcaps]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

The options for ripple current, ESR, impedence, etc have me completely lost.

The following has why, how, examples, and suggested replacements (regulars may skip).

https://www.badcaps.net/forum/showpo...84&postcount=3

[PohTayToez]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

I want to go ahead and replace all of the through-hole caps on this board however there is one that I absolutely cannot find the datasheet on. It a 10uf 25v capacitor manufactured by Changzhou (Chang), and the series is CD81. Would it be possible to assume safe values for a replacement capacitor?

[retiredcaps]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Would it be possible to assume safe values for a replacement capacitor?

If you cannot find a datasheet for it, just use Panasonic FC.

http://www.digikey.com/product-detai...1212-ND/356116

[PohTayToez]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Alright I've replaced all of the cheapo caps with good ones and replaced two more caps on the power board along with one on the input board. It still does the exact same thing (color is washed out; with no video input the screen is more of a gray than a black like it would be normally).

I'll be testing voltage regulators next.

[budm]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

It sounds to me like it has Gamma problem due to bad power supply in the T-CON board.
Can we see the screen shot?
Does it look like this?
https://www.badcaps.net/forum/showth...mma#post304275

[PohTayToez]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Alright, I attached too pictures. The first one is the TV in question. The second picture is of a smaller but similar model TV that is in good working condition, taken with the same camera in order to compare the coloration of the two.

[PohTayToez]

Re: Dynex DX-L22-10A -- At First No Power, Now Picture is Washed Out

Voltage Regulators:
Main Board-

N602
1117SADJ
0820PJ
Pin 1 = 2.04v
Pin 2 = 3.30v
Pin 3 = 4.99v

N603
AZ1170
-3.3E1
927J59
Pin 1 = 0.00v
Pin 2 = 3.32v
Pin 3 = 4.87v

N604
1117SADJ
0820PJ
Pin 1 = 0.58v
Pin 2 = 1.83v
Pin 3 = 3.32v

N605
AZ1117D
-3.3E1
927J81
Pin 1 = 0.00v
Pin 2 = 3.32v
Pin 3 = 4.94v

N611
1122G
0923EG
Pin 1 = 0.00v
Pin 2 = 1.20v
Pin 3 = 3.32v

T-Con Board-
IC501
50117K-5
Pin 1 = 0.00v
Pin 2 = 3.31v
Pin 3 = 4.81v

I haven't looked at any datasheets yet but I'm thinking that N611 seems like it may be off?