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Sony TV KV-XR29M31 with supply blow-up. Fet Q608 and Q607 short circuit taking horizontal output Q and R642 .1 ohm. Is it caused by dried-out caps and does it take IC 602? Appreciate any help. Thanks.

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Replace the FETs with ones from Sony distributor. Do not substitute. Replace all of the small blue disc caps in the area. These can short causing the power supply to fry. In your case, the HOT probably was the initial problem, not the supply.
Dan

Posted on May 01, 2008

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The problem is from the power panel of the television. It got burnt due to the voltage that hit the panel.

Mostly, it's a capacitor that gets burnt on the panel, so what you have to do is, open up the television with the appropriate screwdrivers and locate the power panel, it is attached to the main cord that is connected to the power supply.

Assess the panel, and check for the burnt capacitor that is on the panel, or you can as well replace them power panel.

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HORIZONTAL OUTPUT TRNSISTOR SHORTS WHEN POWER ON TV


ALL the next is with the tv unplugged (NO NO power)
  • resold the jungle (video processor) all around
  • following the horizontal drive pulse path and arriving to the horizontal area just after the horizontal transformer and in the base of the horizontal DRIVER there is a electrolytic capacitor (if this chassis uses this one,) Change it (maybe is dry)
  • solder all components i just told you in the last step. horizontal driver, transformer, etc
  • remember:
  • if a transistor is blowing with no reason (there is a reason: the collector receives 130 volts but cannot hold it forever, It has to be in some place. if the switching pulse doesn't arrive to it the transistor throws this 130 volts and burning itself. i hope it is help full.

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Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.

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It is definetly a power supply problem shorted bridge ,switched mode transistors DO NOT TRY to fix if you dont know what yor doing I got 30 years in it.GOOD LUCK. WAYNE

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