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Samsung HCP4741W - Won't turn on. Red light flashes on the power button. I checked inside and all boards and wires look fine. Any idea???

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6 Suggested Answers

  • 65 Answers

SOURCE: power button flashing red

stk convergence packs may haqve failed in the dead short mode stk392-110 removing them from circuit may allow the set to turn on again good possibility do you know how to solder?

Posted on Dec 09, 2006

SOURCE: no power,red power lights keeps flashing.

Just my coment THis tv has a complex system that include a digital signal porcessing in a high levle technology to show a good performance, i myself work on the development of that model, we was thinking we are best, for improve that many eng. dedicates almost all life to have that technology in our rooms, I offer my apologize for that but many eng dedicates all year 18 hours a day to fix that, thanks

Posted on May 13, 2007

  • 179 Answers

SOURCE: ON/OFF button (red - off and on - green) flashing all the time

it is important to count the number of red flashes, if it is 5 then the lamp ballast board has failed, (part #1-468-798-14) if it is 4 then the optical block fan (# 178706511) is probably to blame, if it is 6 then the thermal fuse has gone bad..(# a1137954a)

Posted on Nov 29, 2007

  • 1779 Answers

SOURCE: Lamp power supply board on Panasonic PT-50LC13 mulfunction.

You can purchase the lamp supply thru "Encompassparts.com... The cost is $100.00, there is a $250.00 core charge on that module, so when you return the old they refund the 250. Initial investment will be 350.23 then take the 250. off that. That will be the end cost.

Part # LSEB3087A

Posted on Apr 16, 2009

  • 1164 Answers

SOURCE: Sony rear projection TV power light flashing red.

hello it will flash if the bulb is not securely fitted and make sure the front cover is fitted securely as well


regards
shaun

Posted on Jan 22, 2010

  • 1 Answer

SOURCE: Have a Hitachi 53sdx89BA Rear Projection TV. Turn

Discharged Flyback Transformer. Removed main pc board from bottom of TV and flipped over, no apparent damaged components or blown board traces were found. Noticed a lot of flux in various areas on the board that seemed unusual (maybe TV was worked on before as I bought a showroom demo at Circuit City). Used a plastic screwdriver to remove all flux between connections on ICs, Transformers, Flyback Transformer, and various other components. Cleaned all debris, dust and crud accumulation (TV is over 10 years old and there was alot around the Flyback Transformer) from both sides of board using a lightweight paint brush.
Used a magnifying glass to check all solder joints for possible cold solders and found none. Did the same for Power Supply Board. Checked various ICs and Power Transistors for opens or shorts (in machine) and they seemed fine. Reinstalled boards, said a few Hail Mary's and fired it up.

The protector Led no longer flashed under power and lo and behold I got picture and sound!

I cleaned the lens on the projectors (again 10 years of dust accumulation) did a magic focus adjustment and it works fine!

After reading other fixes, I fully expected it to die after 10 minutes so I left it on all day and against all odds it still works.

What was the fix......Dirt buildup on and around Flyback and other components,,,,,,Flux conducting electricity between contacts on Flyback and other components.....or oxidation on connectors between Power Supply and Main Board.....I don't know.... all I know is that for the moment I saved around $ 300 - 400 in repair bills by doing it myself.

Posted on Feb 02, 2010

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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
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    • Re-soldered adjacent pads that looks suspicious

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