Question about Sony FD Trinitron WEGA KV-34HS420 34" TV
The size of the picture is smaller than the standard size. Tried by referring to the manual but didn't work. And the manual doesn't really explain how to increase the size back to normal.
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Posted on Jan 02, 2017
SOURCE: Sony FD Trinitron Wega
The power supply board is failing. There are twi integrated circuits in the horizontal drive circuitry that have to be replaced. The original integrated circuits are the same type and you will see written on each..."MCZ3001D" and need to be replaced with Sony # 670581001 or the "D" board with those parts on it needs to be replaced. The cost of the entire board is high-about $375.
Posted on Mar 01, 2008
Since this seems to recover for a while, I'd first look for poor solder connections on the board. If you can solder, resolder any connection that appears grainy or has rings. Let me know if that resolves the problem. If not, the likely part is a bad capacitor in the kine bias circuit. I'll look up your specific model in that case and get you specifics.
Posted on Aug 26, 2008
SOURCE: KV-36XBR450, FD Trinitron WEGA
This sounds like the HV protection circuit is cutting off the TV due to a high current event in the set. This could be a problem in the High Voltage section of your TV (Horizontal output transistor, Integrated High Voltage Transformer, and y of the deflection components, and or the CRT in cases of shorts).
I would suggest that if you do not have a background in electronics, you should have an experienced TV technician troubleshoot and repair this problem.
This is due to the nature of the dangerous voltages that are present in the television.
I hope this helps,
Posted on Nov 23, 2008
have over 10 years experience in electronic tech
I know this isn't what you want to hear, but the problem you've described can't be fixed with troubleshooting. Your TV will have to be repaired. There is a part that has developed a defect and needs to be replaced. If you're still in warranty, the TV will be repaired at no charge to you. The warranty would likely be at least one year from the date of purchase from the manufacturer. If you purchased an extended service plan they will repair the TV at no charge as well.
If the TV is no longer in warranty, it will likely cost a minimum of $150 parts and labor. This is assuming that you only need one circuit board or small part. If the problem is more than one of the circuit boards, the price of repair could go much higher.
I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.
Please let me know if I can be of further assistance.
Posted on Jul 11, 2009
WARNING- VOLTAGES STORED INSIDE YOUR TV CAN KILL YOU EVEN AFTER ITS BEEN UNPLUGGED FOR DAYS..your problem is in the zero cross detect circuit . youu should take it to a repair facility. -Or replace diode D647 . Or on remote in this order press "display -5- vol down - pwr ." and then you could watch it right now ..kinda
Posted on Oct 01, 2009
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