Have TV Questions? Ask a TV Technician
Hi, my name is ***** ***** I will do my best to help you today. To make sure I don’t miss anything, please give me a minute to review your question.
Please note that I am an independent technician who depends on your positive rating to get paid by this website.I have no control over the phone (or other) offers , these are sent by the website ,not by me but let me know if you`d rather do this on the phone.That being said please reply following info request to troubleshoot the issue.1- Does TV show normal picture when it power up?2- What video devices/ sources (such as cable box DVD player etc) are connected to TV and does the problem occur on all video input sources?
3- Any idea how old is the TV and how long it have had the problem?Thank you.
Thanks for the info.
- So TV shows normal picture after some time, correct?- TV is connected to cable box through HDMI cable, correct?- And TV is 2005 model, is this correct?
Did you get all those boards from reputable source and are the replacement boards new or used?
Two more questions as follows..
- Do you get any change in TV symptoms after those boards replacement?
- Did you get all those boards from reputable source and are the replacement boards new or used?
OK, have you tested Vs (180V), Va (55~65V) and Vcc (5V) output of power supply board with multimeter?
Vs, Va and Vcc test point would be marked on power supply board, these are DC volts.
OK, take your time.
Vcc could be marked as STB or standby volts.
No, standby power section wont be on sub-power supply board, you can test 5V DC at connectors such as CN63 or CN89 etc while TV power cord is plugged in but TV is in standby mode/ no power up.
Did you check Va and Vs volts output?
OK, I need to go offline now, can we continue it at later time such as late hours at night or tomorrow morning?
Thanks, I'll reply as soon as I come online but not before 6 hours.
Standby volts seems OK.
Vs volts are low and can be cause of trouble.
Va volts seems OK.
Please turn On the TV, take reading of Vs volts, leave the TV On until the flicker stops and normal picture appears then again get reading of Vs volts. Is there any difference between these two readings?
If so that means either power supply board is defective due to failing capacitors or ysus board at left side has weak/ failing capacitors or display panel/ screen is going bad.
OK, take your time and reply back with the result to proceed.
This is odd, Vs should be around 180V DC because it is display panel requirement.
Please find a sticker/ label pasted on metal frame of display panel/ screen that would contain required Va and Vs volts info. What is written there for Vs volts?
I never come across such issue as this panel needs only 82V, let me repost this question for other experts to have a look and hopefully some one will soon respond to assist you further.
I'm opting out to repost the question.
Hi I sent you a phone call offer, I made it as cheap as possible. Please accept so I can give you the proper advice on this.
Thanks It will be much quicker than us typing the whole thing back and forth.
Or we can work here if you dont want that?
Please let me know.
Ok Im here when you ready;-)
Hi Bill, it was a pleasure speaking with you today, hopefully i can get you the schematic for that power supply but I really do suspect that above all else in this.
I will be in touch and you can keep me informed of your progress;-)
Hi, yes that is correct, I was able to get some info today. But these power supplies can cause the trouble you have because somewhere on that board, there is either a low voltage, or noisy signal on one of the lines, An oscilloscope is needed to check for that. That will show the exact wave forms and if the signals are clean and when the warm up period that it should not have lol. Also bad electrolytic capacitors can also certainly cause this issue;)
I will be back in the morning to work further with you on this.
Have a great evening!
Hi, thank you for the pics I still suspect the power supply.;-)
Hi, well all these components have different values. But yes if you can ones with the same value part # then by all means yes;-)
Tech Mike ;-)
I would look at every capacitor on the power supply, look for any that have bulging lids and ones that appear to maybe leaked a brown or green fluid that will have dried by now. Also you will need a capacitor tester to be certain they are all good internally;-)
I agree totally ;-)
Let me knwo how the new one works out.
I will be here to help if needed.
Have a great weekend!Tech Michael