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Power board circuit for L20V34S - Projection Televisions

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Repair of the Zenith L20V34S
The power supply is responsible for 90% of failures on this model.
Symptom 1
TV cannot be turned on. It will act as if it is completly dead.
Repair
Replace capacitors C5 and C6, rated at 47uf@35V, 105c, on power supply board. Shield on bottom of PS must be removed first. These caps are small and are located in the middle of the PS up against a heatsink. Select caps that will fit in this small space.
Symptom 2
TV will power up but when the screen comes on it will only flash on for a moment then go dark. Powering off and on will only produce the same flash for a moment.
Repair
Replace C14 and C15, 2200uf@16V, 105c, These filter caps are located near the output connector. When these caps become degraded the inverter board startup current is more than the PS can provide. It is recommended that all four of these caps be replaced at the same time since its very likly they have all become degraded. Don't forget to replace shield.

Posted on Dec 04, 2013

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I WORK FOR A HOSPITAL HAS SOME 70 L20V34S. THEY HAVE STATRED ALL GO DOWN. CAN SOMEONE HELP ME WITH THE CAUSE OR PART NUMBER FOR POWER SUPPLY OR WHAT EVER THE PROBLEM. THANKS HCC

Posted on Jun 05, 2009

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Sony TV Error Code - Two Blink Solution


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1 Answer

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