Viewsonic n2752w Red Power light Blinks

[BiG_TaNk]

Hi, new to the forum here.. you guys seem extremely knowledgeable..

I have a Viewsonic n2752w 27" LCD tv that was made in 2007.. It worked great until last week friday it turned off by itself and wouldn't turn back on. Now the red power led light just flashes red over and over... I did a lot of research and heard about the bad caps... So I open it up and sure enough there are 5 caps that where bulged and a couple of them even had some leakage.. I Went ahead and made a cap repair kit from lcdalternatives.com and had them sent to me.. I had no electronic or soldering know how but I went ahead and practiced removing some caps from a old broken ps2 so I could get some experience before the tv repair..So I was ready to operate and I replaced the 5 bad caps and then tested it and no luck tv still wont turn on and the red light still just flashes... So I go ahead and replace all 14 caps on the power supply board and still, the red light flashes...

Does anyone know where I should trouble shoot next? What to look at, possible other causes for the red flashing power light? Any help will be greatly appreciated...

The first pic is a pic of the power board and mother board.. Second pic is of the bad caps.. third pic is of the replacement caps.. pics 4 through 8 are just clusters of things on the back of the power board.. pic 7 I circled something that looked darker than the others, could this be bad?
and pic 8 is the diagram I made..

[BiG_TaNk]

Re: Viewsonic n2752w Red Power light Blinks

wow thanks for the help...

[PowerAmpFreak]

Re: Viewsonic n2752w Red Power light Blinks

I would search for the service manual for the unit. Some sets flash the led in a special sequence and actually tell what is wrong. You could also verify that the output voltages from the powersupply seems ok, but of course this might require the manual aswell.

[PowerAmpFreak]

Re: Viewsonic n2752w Red Power light Blinks

The servicemanual for the '2750 is here:


Have no idea if this is similair enough, but sure worth a download.

[BiG_TaNk]

Re: Viewsonic n2752w Red Power light Blinks

thx but I cant understand the troubleshooting thing..

I give up Im gonna end up bringing it in to the repair man..

[Dgtech]

Re: Viewsonic n2752w Red Power light Blinks

It sounds like you are on the right track with what you have done so far. If you want to spend money though, I'd take it to the repair guy who is just gonna go onto badcaps.net and try to find a fix just as you are doing.

A couple of things are in your favor right now:
1. You have had visually bad components that were easy to correct.
2. You have located a service manual for this unit.

Odds are you're one step away from having a working set.

What are the output voltages from the connectors on the top and left hand side of the board (picture 9)? Which one goes to the processor board?

Could you post a close up picture of the processor board also?

[smason]

Re: Viewsonic n2752w Red Power light Blinks

wow thanks for the help...

Nice.


I had one of these on my bench a while ago.
All voltages were fine, power supply was good, just wouldn't power on.

After much spinning of wheels I dertermined that the microcontroller was bad, and scrapped it. I should have kept the PS and Inverter boards, but didn't bother.

[mbates14]

Re: Viewsonic n2752w Red Power light Blinks

yup. I had a viewsonic 27" one time with the same issue, had to replace the mainboard.