There is a clicking noise when it comes on. Checked fuses and no obvious bulging capacitors
Clicking noise is usually produced by a shorted load or overloaded SMPS (power supply), black screen as you had mentioned may contribute to a short circuited load.Check voltages (secondary) might be pulsing from high to low that sync the clicking sound.Checking load resistance through filter capacitor will help a lot then try isolating circuit branches to localize the shorted or leaky parts.Try isolating(one at a time) the power supply's loads may help a lot.
SOURCE: sanyo dp42746 low volt power problems
The power supply is failing, or there is another circuit area that is pulling too much current, and the supply is going in to protect mode.
This would require proper troubleshooting by an experienced tech. If the problem is very involved, or the tech is not familiar with the set, he will require the service manuals and service information.
Jerry G.
SOURCE: dead relay(?) on dp42746 is this common.
Ok Fellas I found the Problem!
The Problem is the V4 Y-Main Board. This board is located on the left side of the case looking upright from the back. I spoke with may suppliers, and Sanyo all confirming this. Apparently it has been an issue for some time. Sanyo has replaced the V4 Y Main board with a W1 Y main board in newer models. The W1 Board is NOT compatible for us tho. Just to be sure... If your T.V is taken apart (like mine) Disconnect the peripheral cable from the V4 Y Main, and turn on the set. I bet it will power up with audio and channel function just NO picture. When you plug the board back in... POOF set shuts down. Replacement boards are VERY hard to come by. So Happy Hunting!
42' HD V4 Y-MAIN
PCB: LJ41-02760A LJ41-02761A LG92-01200A BN96-03352A
Oh yeah.. just FYI, Sanyo, Phillips, and Samsung all use the same parts. Hopefully that will help your searching.
SOURCE: screen went black on my 42" sanyo model dp42647 lcd
Hi there! The panel may be in protection mode. The Inverter board is the most logical area to start after checking power supply Voltages.(5,6,24 and 13Volts). There may be coils on the Inverter Board which have bad soldering or faulty. Other than this it may be main board which controls switch on or off. If all else fails, refer to a repairer. Beware of High Current!!! Best Wishes and Good Luck, Jus004
SOURCE: Sanyo DP42746 42 in. Plasma No Video
to test all y sub boards remove the main power connection to the y main and turn the tv on if it powers on one of those boards are bad.. remove both sub boards. and plug in the y main. if it powers on then that board is good either, put your multimeter on 2k omh and test the upper ysub boards black connector, the top 2 pins with negative to the 5th pin positive. you should read 500-1k ohm if its way under 100 there is a short.
the bottom ysub board place the multimeters black probe on the bottom 2 pins of the black power conection and the red on the 4th pin.. results are the same.
low resistance means theres a short in the board.
158 views
Usually answered in minutes!
×