SCREEN WENT BLACK STILL W/ SOUND, PSB BEEN REPLACED ONCE AS EARLY AS ONE AFTER PURCHASED AND THEN NOW 5 YRS LATER. DID CHECK ALL FUSES IN THE PSB, NO LUCK. WHERE DO I GET POWER SUPPLY BOARD AND HOW MUCH? OR THAT THE PROBLEM OR SOMETHING ELSE, COULD IT BE A LOGIC ISSUE OR THE ROSTER IS NOT RESPONDING? NEED ASSISTANCE. THANKS.
SOUNDS LIKE IT COULD BE Z-SUS BOARD...POWER SUPPLY IS PROBABLY OK IF YOU HAVE SOUND...WHEN Y-SUS FAILS ..IT USUALLY CAUSES SET NOT TO TURN ON AT ALL...CALL ANDREWS ELECTRONICS IN CALIFORNIA WITH MODEL NUMBER...THEY WILL GIVE YOU PART # AND PRICE...JOE ACE
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Your tv contains protection circuitry that would shut down the tv if the ymain was out. If the ymain had blown, you'd have no sound and just a flashing standby light. My gut tells me you need to replace the Power Supply Board (PSB). I've seen this before and after spending too much money trying to diagnose a ymain failure, I was surprised to learn that when you have sound but no picture, the psb is a gonner. Try ebay, shopjimmy.com or discount-merchant.com for a replacement.
eithor the flyback just craped out or the tube went
try turning up the flyback failing that call a service tech and ask for a quote
quote cose 30-50 bucks
atleast you will know forsurre if it's worth fixing
SOMETHING IS LOADING DOWN THE POWER SUPPLY...COULD BE THE Y-SUS BOARD OR UPPER OR LOWER Y-DRIVE BUFFERS...TAKE THE BACK OFF SET..GIVE IT THE SMELL TEST AND EYEBALL THE FLAT I.C.`S ON THE THIN BOARDS TO THE LEFT OF Y-SUS BD. IF NO BURNING SMELL AND NO CRACKS ON THE FLAT I.C.`S ...TRY REPLACING THE Y-SUS BOARD...NUMBER ONE PRIME SUSPECT...DO NOT POWER UP SET WITH BACK OFF UNLESS YOU ARE QUALIFIED SERVICE TECH...JOE ACE
Remove the Power Supply cable to Y Main board and check the Vs voltage in Power Supply board.
1. Vs voltage is OK, replace the Logic board or Y Main board.
2. Vs voltage is NG, replace the Power Supply board.