Question about Samsung HCM4215W 42" Rear Projection Television

1 Answer

Will not turn on

Press power botton power light flashes a few times then nothing replaced the red PCB and converg board with NEW parts, TV turned on for a min, long enough for me to start the perfect focus deal. went to 4% and got stuck, so i turned off the TV . turned it back on and now the light flashes but nothing happens. when you normally turn on the set it clicks,, well theres no click now and no little tones from the speakers , but you can hear something actually charge (for lack of the actual term) then nothing , if you unplug it and hit the power button it goes BEWWET.. then its silent once again.
i was really hoping to just replace the STK board and red PCB that caused all the problems to start with, and was pleased that it didnt explode when i was done installing the new parts , but now i need help with this new issue.
Josh

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  • duncyn Feb 26, 2008

    ok i am GREEEN GREEN to tv repair, and i will not attempt something im not confident in trying, that being said.
    are the pico fuses being "open" meaning to test with a DVoM or is there a way to visually check them? aside from the normal black soot and stench of electronic failure.
    and this blue stuff you speak about? where might that be located?
    Josh PS. thanks for your fast answer :)

  • duncyn Feb 26, 2008

    ok i read on another post about unplugging the convergence board to get the set on, i did this , and when i did the set fired up and looked GREAT except that the convergence was all misaligned, but it was a uniform misalignment. so i looked through the menu that you mentioned and could not find factory reset in ANY menus at all.
    i then plugged back in the convergence board and started up the set again and same thing ,, just a flashing light and no picture at all. (hope this helps)
    so that being said im HOPING this is a simple common problem that everyone but me has seen and the fix is as simple as me:)
    Is there a plug i can pull on the board(S) that would revert this back to factory settings? kinda like a motherboard jumper resetting the bios?
    Josh

  • duncyn Mar 05, 2008

    PERFECT response.
    i have an RMA in the mail for the new board i will do the reset of the convergence now , i have looked in the CRT and the guns are CRYSTAL clear,, almost as if theres no coolant (eep!) anyhow thanks for posting a response, ill certainly keep us all posted.
    Josh.

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Check the convergance board for open pico fuses located near the stk amps if they are open the you may have a yolk problem as well. also check the blue gum for cloudy fluid this may be the reason the perfect focus got stuck. if you should get the tv to fire up go to the menu then select reset factory in the convergance menu of the customer menu. this will pull the convegance back to tollorance. the trouble is that when the convegance amps fail customers tend to perfect focus the set and each time they do the convegance memory goes further from tollorance. thus failing the ICs once again. check the pico fuses 1st this is a tell tail sign of those two conditions (yolk, or out of tollorance).

Posted on Feb 26, 2008

  • Robert Johnson Feb 27, 2008

    since you unpluged the convergance board and the set fired up replace the convergance board once again. I ment the blue gun (big fingers small keys). there is a fluid inside the gun itself this keeps the gun cool. often the fluid gets cloudy mostly in the blue gun (crt assembly). if you look directly into the gun with the set off you should see the face of the CRT clearly if not the coolant needs to be replaced. if the menu has a manual convergance setting (1st unplug the convergance board as you did) start to adjust one of the colors then stop and go back to the manual settings, it has a "save new setting" option and "reset factory" option choose this option before replacing the convegance board again.

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