TV Led Sony KDL-42EX44 - flashing half of screen after one hour

[johnvpr]

Hi Guys

I have a TV Led Sony KDL-42EX44

The right half part of the screen is flashing on and off after one hour the tv is on.

The tv have the led back-light driver on the PS (APS334 - 072-0001-3090)

Is the led driver on the PS that is causing the issue?

Should I replace the two 10uf 450V on the board?

Thanks

John

[Electronic Handyman]

Re: TV Led Sony KDL-42EX44 - flashing half of screen after one hour

Hi John. I'd check the voltages going to the leds via their plug in connectors see if one varies or isn't stable and if it's the correct voltages.Usually the board will have the voltage info marked on it. On some sets you can plug those out and the PSU still will work you could test the voltages on the board at those two connectors and at the other marked pins.If possible I'd try to isolate the PSU and test it's voltages that way too.

It's hard to see those caps that well to really see if their bad visually and you can't really tell sometimes just by looking at them.I'd go by how old that set is and what brand of capacitors are in the set.For example many capacitors fail within 3-5 yrs especially near the hot spots or if a set is used a lot etc.I'd check all the board soldering connections,voltages, then check the caps out of the circuit. Also check the resistors close by Q6801 and Q6801 etc. Since I have many different common caps on hand I'd change them regardless what their test results were.One thing I do is I try to up the voltages of the new caps so if it's a 10UF 450V cap I use the nest higher voltage cap available to me.

You can purchase caps on mouse.com and ebay and other sites , just be sure their a good brand and Low ESR. Also if you need something to test electrolytic capacitors, diodes, mosfets, transistors etc you can look Mosfet test equipment and try to get the ones that have test leads.Their not really expensive and their handy to have along with a good digital meter, soldering station, solder sucker, solder wick etc.