Question about Mitsubishi WS-65611 65" Rear Projection Television

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GREEN LIGHT FLASHES (70 + TIMES),THEN SHUTS OFF AND TV WONT START. ALL STANBY VOLTAGES OK MICRO VOLTAGES OK CRYSTAL OK WHEN DEPRESSING POWER BUTON -POWER-IN PIN ON MICRO GOES LOW, BUT POWER1 PIN DOESN'T GO HI FORSSING TV TO TURN ON - ALL SWITCHED VOLTAGES SEEMS TO BE OK, NO HD TO GET HV ANY SUGGESTIONS WHAT COULD IT BE? REGARDS pete

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  • petargrbesa Jul 23, 2009

    the only stand-by voltages we have checked are 5v, and 12v. they are there. within the power supply, since there is no P-ON1 voltage from the micro, we checked that micro, and found vcc ok, and the xtal is oscillating. in an attempt to turn the supply on, we shunted the collector of Q9A51 to ground, forcing it on. the main power came on, and we read 210v on the 220v supply, and 110v on the 110 supply, etc at transformer T-9A50. there was still no h.v., and the set did not come on any further. please continue to assist us on this model. Thanks.... John Steinway

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  • Mitsubishi Master
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Hi,

standby voltages? what do you get?

try checking B+, can you get the voltage reading at the positive side of the diode at the secondary side of the chopper?

indicate all DC voltages you can measure on it.

try this:

if voltage is low,
you might have a partially shorted flyback

if voltage zero,

might have shorted diode
might have shorted horizontal output


if voltage is OK say 110V, there is no drive in horizontal output transistor, might be blocked, will not oscillate, will not turn on


hope this helps, thanks for using Fixya!

Posted on Jul 23, 2009

  • Rommel Cana
    Rommel Cana Jul 23, 2009

    try to trace down the circuit from base of the horiz out, it needs signal to oscillate, might be blocked

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