Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!!!

[koopa8585]

Hi i have a veiwsonic vx910 with the blinking green light
i replaced 2 bulging caps ( 470 uf 25 v)
still had blinking green light
so i than replaced 4.7 uf cap

should i keep replacing caps????

what else coudl i do to find out the problem?

what are other common problems with the veiwsonic vx910

[seanc]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

What caps are you using?
Pictures of your power supply please, attached to the forum using the manage attachments function.

[PlainBill]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

Replace ALL electrolytic caps (possibly excluding the 450V one) with name brand low ESR caps such as Panasonic FM, FR, or FC series. That will cost under $10, including shipping. Replacing one at a time, using 'general purpose' caps, or buying parts from Radio Shack is an exercise in self flagellation.

PlainBill

[koopa8585]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

The large red arrows were the bulging ones that i replaced. the small red arrow i replaced as well. i am waiting on the 2 330 caps they are in the mail.

do i have to have the same rating caps? how much can they be off ?


The caps i used were from radio shack

i replaced them with the same values

i replaced the 2 of the 470 uf 25v caps
and 1 of the 4.7 uf cap

[sabre504]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

Hi the caps you have used if they were off the shelf from radio shack will be general purpose and not the correct type for this application .

Low esr caps as supplied on this site or from Digi key are what is needed ,
if you read the links on Plain bills post's they will point you in the right direction

[koopa8585]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

some more detail on the caps i used when replacing



http://www.electronix.com/capacitor-...uf-p-5682.html

this is what the product description was
These electrolytic capacitors are radial lead style, 50 Volt, 470 microfarad. Low profile design for small installation areas. High quality, 105C (Celsius) temperature rated.

were those the correct caps? or do i need to order new ones ?

[seanc]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

They're Jamicon - they're wrong.

[Rtech]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

The most common faults on this PSU/Inverter,used on a number of VX models are as follows:-
1) Electrolytic Caps as usual
2) Failure of T1(top right on your photo)
3)Failure of brown cap next to it,C24

[koopa8585]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

should i order a T1 and brown cap or could i get away with just buying a new set of electrolytic caps?

i have bought QUITE a few worthless parts alredy and i could have just bout a new power supply board by now i would liek to do this as cheap as possible.


Electrolytic Caps as usual
2) Failure of T1(top right on your photo)
3)Failure of brown cap next to it,C24

[PlainBill]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

should i order a T1 and brown cap or could i get away with just buying a new set of electrolytic caps?

i have bought QUITE a few worthless parts alredy and i could have just bout a new power supply board by now i would liek to do this as cheap as possible.


Electrolytic Caps as usual
2) Failure of T1(top right on your photo)
3)Failure of brown cap next to it,C24

This monitor also may suffer from shorted transistors in the inverters. You can test them with a DMM. Take a picture of the back side of the power supply / inverter board and I will point them out.

PlainBill

[koopa8585]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

thanks here are some pics

[PlainBill]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

thanks here are some pics

The first picture is OK, the second is useless. I'm running a little slow today, so rather than mark up the picture, I'll try to do this verbally.

On the left side, Q6 and Q7 are the drivers, check them for shorts. Also check the equivalent pair on the right side; sorry, I can't make out the location numbers. Also, check D9 and (I believe) D10

PlainBill

[koopa8585]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

i am a real newbie when it comes to fixing electronics.
can you please explain how to take the measurments and what readings i should get ?

[jetadm123]

Re: Viewsonic vx910 replaced bulging caps but still have blinking green light HELP !!

i am a real newbie when it comes to fixing electronics.
can you please explain how to take the measurments and what readings i should get ?

No use having PlainBill repeat himself. Please go to the link below and start reading at post #5

https://www.badcaps.net/forum/showth...ighlight=vx910