Had blinking red light, replaced power board, same problem, replace the siene board, excellent picture but ,nosound. Returned to factory settings, no joy.

HI Ray....unhook the plug going from the power to main board and see if you get backlights when you plug the set in, if you do chances are you have a bad replacement main

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electronicshelponline.blogspot.com/
http://electro-medical.blogspot.com/
Blinking codes details of many popular brand TVs are given. Surf the site with patience.
If blinks continue without any pause, the main board is faulty.

If there is no audio then most likely your main board. If your red power stand by light blinks less than 3 s then its the M/B. If its more than 3 s then its the P/B.

Good day sir Thor!!!!


I already encounter that kind of problem many times..It looks like all normal even the green power light is not blinks or change to red or amber color but still no sounds or picture on TV..

Sometimes it will happen to plasma TV in all brands and model..It cause of faulty main board..

This is the sample picture of main board of your unit..Part # (3850-0142-0150)


You can order this parts here:
http://premiertvparts.com/index.php?main_page=product_info&cPath=1&products_id=797

http://www.ebay.com/itm/NEW-VIZIO-VP50-HDTV20A-MAIN-UNIT-3850-0142-0150-2A-/320737894046

http://tvpartsfast.ecrater.com/p/12695612/vizio-3850-0142-0150-main-board-for-vp50hdtv20a

http://modulesrus.ecrater.com/p/11497716/vizio-main-a-v-3850-0142-0150

Just replace the board to fix your TV and it works again..

Note: When you install the board make it sure that the static energy on your body discharge to ground to avoid corrupt of main board IC..

EXAMPLE: open the cover then find the main board..before you do that make it sure you hold the metal portion of your TV to discharge static after that you can now freely replace the board and also make it sure to memorized the connector to avoid damage to make it sure take a picture on it before unplug connector for future reference in case..

again discharge static please!!!..Only few tech or other people know this that's why when they install new boards its not works even it is new..I discover this base on my experience and study..

Hope it helps..

Please don't forget to rate!!!!

Thank you using fixya..

Tries unplug,replug the tv back like an hour later.The tv now,should resetting itself back to the factory setting.The tv should work now.Not,than the tv power supply board have problems,not giving the tv it wright voltages anymore.The tv power supply board that the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Ur video backlight board it dead,must replaced to get the picture back.

Replace the digital/ siene board

If the red lights comes on and stays on, you will need to replace the lamp. However, if the red light blinks repeatedly, your internal motherboard was either fried during a recent power surge, or the circut board will need recalibrating. In short, you will need to contact a cert. technician to re-initialize your set. It may be more cost-efficient to purchase new flat-screen plasma set. Good luck with your investment.

Solved by resoldering some solder joints!!!!!!!
********
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

• Upon turning on set I got flashing red power light and nothing else.
• Removing plug for one minute and plugging in results in:
• Audible click, steady red power light for 2 seconds then slow flashing red light
• Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
• Removing power cord for several hours and plugging back in made no change
• Audible click, steady red for about 2 seconds then slow flashing red light
• Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
• Fuses F850 and F852 found blown

Repairs Made:

• PD0074 DEF/CON Power Board
• There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
• Replaced blown fuses F850 and F852.
• I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
• Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
• Used a fast blow 2 Amp for F852.
• PD0073 SIGNAL Board
• Re-soldered Q751 + Q752 STK392-110 Convergence Amps
• Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10

• Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
• Already owned Service Manual and Circuit diagrams from a different 2004 repair.
• Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
• Some solder. Already owned de-soldering tools, etc.
• Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

If I remember right the set is blinking a code, dont remember which code, but what happened something on the power board failed and knocked out the 5vdc regulation? The power board will most likely need replacement, this should be done by a qualified technincian or someone who knows how to dissassemble/ repair set.