Is there a schematic for the main board for this TV around anywhere? I have no power and a visual inspection shows C921 burned out. I am looking to get the value and type of capacitor to replace this part.
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Replace convergence IC (location 8c01) which is a STK-393-110. You will need to order an after market market convergence IC (STK 393-110) I have had good luck with this IC. Next, check and replace all the 3.9 ohm 2 watt resistors, that are bad. You can check them with an ohm meter or visually inspect for burns or peels. Resolder the Convergence board, as by now there are many bad grounds (broken solder connections). Be sure to resolder the jumper jacks that connect the board to the next board too.(Under this board are solder traces that adhere to the jumper connections that will snap to the next board.) These would include jumper jacks PM, VU, and PF. Good luck and thanks for asking, show all hands of support!
Ok you are going to need these items before we begin. digital multimeter, and the schematic of your set. These items are the bare necessities for troubleshooting this problem. If you are uncomfortable around electricity, don't even attempt troubleshooting the set.
Ok the thing you need to do first is:
1) get the schematic of the TV set (Call the manufacture to get this)
2) get a digital multimeter (your local radio shack will have this)
3) take picture of the circuit board so as I can have a visual guide by which to help you locate components.
4) send me a copy of the scematic so as I can guide you through the
Ok get these items and we can begin.
Your problem is caused by dry joints and cold solder on the board. If you have a soldering iron and soldering lead open the back panel of your tv. Look for dry joints around the board especially on the power supply section.Cold solder is hard to spot, it is necessary that your working area have sufficient source of light or you may use a table lamp.
Hope it may help you.
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Nov 2011 - Comment Have similar problem on a Panasonic Tau model CT-27SL15. It's a 27" CRT TV manufactured around 2005.
Other posts / solutions on this problem say possibly a capacitor going bad in the vertical circuitry / near the vertical IC / vertical blanking circuitry. Telephone call to a TV repair person mentioned something similar - "possibly a bad capacitor in the vertical circuitry".
Found a service manual online w/schematics and board layouts.
Panasonic Service Manual http://dl.dropbox.com/u/35219914/PANASONIC%20CT27SL15.pdf See pg 25 (of 42) - Deflection Schematic Diagram (Main PCB) Shows: V Output IC - IC401 Finding the actual bad component(s) may not be so easy. Anyway ... just wanted to add this comment.
You can only get the service information from a pay for service. They will charge you money for a copy of the information.You can find the service information with the use of a search engine. Use the brand name of the television and model number,ask for service manual. You can call the Panasonic customer support telephone number and ask them where to purchase the parts and service information. The telephone number is 1-800-211-7262 between the hours of 9am-7pm EST. They will help you with the service information and parts. If you have never done this type of repair before you will need to upload the schematic or service manual and ask for help from one of the experience television technicians. The troubleshooting will start from the power supply and continue until you fix the problem. This will require tools, test equipment, and a work space to work on the television. You will want to visually inspect the circuit boards for bad components and test the one that are suspect. You will have to unsolder some components to test them. This may require advanced solder techniques. This is because the boards are layered and can be damaged if not worked on properly. Hopefully this problem is only in the power supply board. Which is the simplest repair. I hope this information helps you with your repair.
this can be caused from numerous reasons, I will specift only the most common ones which doesn't require professional skills to deal with. The "easy" initial technical troubleshooting that can be performed, without a schematic and without a service manual, is using your DMM to make voltage readings and test components, also do a careful visual inspection and make not of any faulty or cracked solder connections around the high heat producing components and other pertinent details. Given the symptoms you
reported, it should be obvious that the areas of initial troubleshooting interest in the television circuitry are the main PS, B+ regulation, and B+ distribution, standby B+ , the HV and HOT area.... also pay attention to the and flyback derived B+ circuitry and components.