Question about JVC Televison & Video
Main board fault. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
Posted on Feb 12, 2020
Describe the past - How did it fail? One day or acting up for a while? Could be a weak power supply - a bad capacitor on a power supply too. Look for popped up capacitor top inside.
Posted on Apr 29, 2008
Most often, this symptom is a result of a failing POWER SUPPLY CIRCUIT but a faulty MAIN BOARD can certainly cause very similar symptoms. Unfortunately, without a donor TV to swap parts with or a dedicated test rig, it can be very difficult to differentiate between these problems.
One quick way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one, since this is the most often the source of the trouble.
You can usually find replacement supply circuit boards online by searching for your TV's model number. Here is a link to the SHOPJIMMY.COM parts supplier website where you can find all the available replacement circuit boards for your model of TV along with their prices:
Here is a direct link to a replacement POWER SUPPLY BOARD for your TV which runs for about $103 US plus shipping, although SHOPJIMMY appears to be currently out of stock of that one:
Here is a link to that power supply board currently available on EBay for about $90 US:
Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and items at the website indicated.
The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.
You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed if necessary, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.
When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your circuit boards and confirm that they exactly match the ones provided in the Ebay listings. Also make sure that any part you order is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is probably faulty itself as well.
Then unclip and remove the various electrical wire connectors leading to the power supply circuit board. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.
Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.
Here is a link to another Expert's solution to a similar problem which includes links to his excellent and informative set of LCD TV / MONITOR TROUBLESHOOTING GUIDES:
These guides will give you some idea of the various problems with LCD monitors and the associated repair procedures.
If you choose to rate BUDMRTN's troubleshooting tips by clicking on the YES THIS WAS HELPFUL icon on his solution page at the above link, then I thank you very much for your time and consideration.
Please comment back here to this page if you have any details to add, have any questions, have difficulty with the links, or just require further general assistance and I will respond as soon as I see it.
I hope that was helpful to you, good luck.
Posted on Sep 06, 2011
set has a shutdown or failsafe circuit:
I see so many here with no sound/nopicture issues:
1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.
Answers to issues:
1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.
2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.
Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.
What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.
3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.
4. Safety first--no TV set is worth getting injured or even killed over.
Posted on Apr 01, 2012
Tips for a great answer:
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In most cases the standby light might blink with different rapidity to indicate a fault relevant to the processor. It is possible that most of these indicate that there are errors in the processing section. Since there is a possible short or leak in the circuit the output driver section can take in huge current to trip the SMPS or from advice from the micro processor. Remove the power plugs and make sure that high voltage sections are discharged of the potential stored in capacitors. Look for visible signs of leak or of busted capacitors. Look for bulged capacitors or damaged components- burnt or busted. Use a multi-meter to check the continuity or shorting in components, if so detach from circuit and test. If the voltage builds up and the set power ON and then shuts up then the suspected section must be checked in detail.
The processor must have the +5 voltage to the function properly, the +B and secondary voltages also must be checked to infer the fault. Trace with caution and in running through the signal path , circuit trail.
Check for tips to check the SMPS unit:
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