Question about Proscan Televison & Video

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I replaced the mainboard on my proscan TV, but the picture still won't show, what's wrong?

I have a Make Proscan Model plded4079sm Part# 186313 Serial # a1604167270001772. The TV will not turn on. The red light on the lower right side of the TV will blink 7 times when I try to turn the TV on. When I try to turn it on again the light disappears until I press the on button again. I read in a few places that if the TV doesn't turn on it's just an issue with the power supply and to just replace that part. This TV has a main board that has everything connected to it the power supply, the hdmi ports, EVERYTHING. So, I replaced it, but it still does not work.

Posted by Anonymous on

  • deton8 von Splosion May 03, 2017

    Sorry... Should have STARTED with telling you to restore your GOOD main board...
    date and note your install o the :SPARE".



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  • Proscan Master
  • 3,197 Answers

Hello Anonymous,

By putting your number (plded4079-sm) on eBay... immediately produced no "USA" power boards...

Likewise an AMAZON search failed.

Which means most FIXYA volunteers are going to
have some difficulty ... The number of your PROSCAN are the only thing that DIFFERENTIATES your set from our similar USA (domestic) models...

We just call them "power boards"... and they are popular
because the new industry standard for capacitors is
"cheap & cheesy"...

The bright-side = there is a bounty of "SPARES" on eBay...
and their reliability (& reputation) is NOT much worse...

(I'm just saying) Shop around...!!

Cautionary statements:
You MUST VERIFY your own circuit pack numbers
(stare & compare)...

Get and use ESD (electro-static Discharge) wrist straps while handling EVERY CIRCUIT BOARD you care about.
(see below)

Take lots of pictures going in... Put EVERY wire
EXACTLY back from whence it came...

PN50C450B1DXZA = USA (wrong)

Failed searches

ESD wrist strap
Amazon com Rosewill ESD Anti Static Wrist Strap Components RTK 002 Black...

Carnac the Magnificent

Posted on May 03, 2017


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 6 Answers

SOURCE: Viewsonic N3250W no power light ?

check out this website, it's got everything you need. I have to give all the credit to Alain, a brilliant guy in France who dug in and solved the problems. he gives instructions for the professional to fix the problem, but he also gives the sources for the power supply board to be purchased and for the little chip that causes most of the problems. I decided to take a risk and save some money and bought just the chip for $20 and very carefully soldered it in after removing the old one. The tv is fine a month later. The board comes out with no soldering, just some quick connectors and the back of the tv will come apart after you remove all the screws and the base by gently prying the back case from the front bezel along the sides of the tv. if you look closely, you will see the small cavities to pry from.

here's the website:

Posted on Aug 06, 2008

  • 41 Answers

SOURCE: Shuts off

From the information you have provided failed capacitors in the power supply is likely causing the problem. The safety circuitry shuts the TV set down when it detects a problem. This model of TV has over 2,000 parts which include millions of transistors inside the integrated circuits. The capacitors will change value, leak and become defective. Resistors will change value and burn. Integrated circuits and transistors can go bad. This can cause other components to become defective, which can have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again since if the parts that caused the failure to begin with are not replaced. The only way to know for sure what is causing the problem, which parts that are no longer within factory specs and for proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment and the skills to use the test equipment. The repair should cost about $250 if carried into a TV repair shop. A small TV repair shop will often charge less than a large repair facility.

Posted on Feb 25, 2010

  • 8457 Answers

SOURCE: plasma 50 inches dont turn on

The power supply board is dead.Tries the websites like, to buy the refurbish power supply board for the replacement.

Posted on Jun 22, 2010

SOURCE: TV power light blinks 7 times and won't turn on

your sc bord is shot replace board and do firmware upgrade will coast about 400

Posted on Dec 17, 2010

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