Dell M770 CTR Monitor Dieing a slow Death

[sam_sam_sam]

I have had this monitor for about 6 year it was made 3/ 1999
I have always like using this monitor until about 6 to 8 month ago when it slow started to pulsate the picture bright to point now I think I am in the Twilight Light Zone and it real bad looking at it at night

So I though let me see if it is suffering from capitis and SURE enough it is
so far I have check the video in board that goes to the picture tube board has 6 caps that read low when being test 2 of them read more than 10%

On the main board there at least < 6 > 1000 uF @25 volts that read 950 uF or lower less

There < 3 > 47 uF @ 25 volts that read 42 uf or less
There one 220 UF @ 400 volts that reads 205 to 210 this one is a ? able if it good or not




I have only check 1/ 10 of this board so far

Dose any one think that this would give this problem that I am having with this monitor

I am going to recap it I do not have all of the cap for it right now but the ones that I do have I am changing them now

On the video in board that goes to the picture tube board has three of .47 uF @ 160 volt NO ( + or - ) on it, it has a ( NK) on them Where do I find these caps they are made by CapXon

There are On the video in board that goes to the picture tube board there are 16 caps By the way the one that you see the red paint on the caps those read low I do not have these caps yet and on the main board there at least 50 caps on it

Below are are some photo of the two boards

This is the BIGEST Project that I have taken so far

I am recapping it with mostly Panasonic (FR)

[Th3_uN1Qu3]

Re: Dell M770 CTR Monitor Dieing a slow Death

Those caps are still in tolerance. Without an ESR meter you can't know for sure whether the caps are failing or not. I'm betting on a flyback failure more likely, specifically the focus/screen divider.

The caps on the video board are bipolar electrolytics.

[sam_sam_sam]

Re: Dell M770 CTR Monitor Dieing a slow Death

It still has a good picture and still in focus and will run for hours with out shutting down or any thing like that

This is the cap tester that I am using NOW

[sam_sam_sam]

Re: Dell M770 CTR Monitor Dieing a slow Death

Is this ESR Capactiance Meter any good

[sam_sam_sam]

Re: Dell M770 CTR Monitor Dieing a slow Death

I order the meter that is in the photo below today


I will update this post when I have put this meter together and what I find out about the caps in this monitor



I hope I do not any trouble putting this kit together or there might be some going on

[sam_sam_sam]

Re: Dell M770 CTR Monitor Dieing a slow Death

All of these caps are in my Dell CTR monitor M770
All caps that have a * are on the picture tube socket board
All othe caps are on the main board

Here are some cap reading that I have check so far

Teapo Brand Caps (SH) series
uF @ Volts > ESR Readings
Data Sheet (SH) series


If I am reading this right 4 is the MAX reading

1-------250--------12.--------*
47------100----------.44-------*
47------100----------.42-------*
3.3------250---------7.4--------* ??? this one might be bad


CapXon Brand Caps (NK) series
Data Sheet for (NK) series

If I am reading this data sheet right the valve should be no more than 2 not the reading that I am getting

On the video in board that goes to the picture tube board has three of .47 uF @ 160 volt NO read .42 uF

.047----160-------18.0-------*
.047----160-------19.0-------* ???? These might be bad
.047----160-------19.0-------*


Taicon Brand Caps (VT) series
Data Sheet for VT series


If I am reading this right 4 is the MAX reading I should have

330------16---------.22---------*
10-------50--------1.7----------*

1000 ----16---------.09

On the main board there at least < 6 > 1000 uF @25 volts that read 950 uF or lower less

1000-----25---------.06
1000-----25---------.05

(FR ) series brand caps NEW

47-------25--------.13--------*
47-------25--------.13--------*
47-------25--------.13--------*

[sam_sam_sam]

Re: Dell M770 CTR Monitor Dieing a slow Death

I hope I do not any trouble putting this kit together or there might be some going on

I had a few set back putting this kit together mostly not taking the time to make sure all part where in the right way.....

All went well after fixing thing the right way......

[sam_sam_sam]

Re: Dell M770 CTR Monitor Dieing a slow Death

Those caps are still in tolerance. Without an ESR meter you can't know for sure whether the caps are failing or not. I'm betting on a fly-back failure more likely, specifically the focus/screen divider.

The caps on the video board are bipolar electrolytics.

This is out of the Dell M770 monitor



I just bought a Blue Ring Tester for High Q Inductive Components

from Ana Tek Corporation

So what Pins do I check on this fly back transformer