Facing TV Problems? Ask a TV Technician.
Hello if the set shuts down when you apply a signal it is a faulty Mainboard- the mainboard is the only component that can cause this. Where did you send it to and what tests did they do to determine it was okay?
What signals have you tried plugging into the TV so far? In other words- have you tried more than one source (cable box/SAT box, DVD player, etc.), as well as different HDMI cables?
We need to make sure there's not an issue with the source sending a DC spike down the cable.
If you've tried that, then there is CN2 on the power supply, which has the 5 volt feed that runs the Mainboard, and also a 24 vdc voltage for the screen. You will need to measure these voltages using a meter while the set is ON. Ground the black meter probe to the metal frame of the set (meter set to DC volts), then use the red probe to test these pins- which are labeled on the power supply. With the TV ON let me know if both the 5 and 24 vdc outputs are present.
Connector CN2 on the power board.
It's labeled on the power board- it's the largest connector on the board.
Then there are TWO possible causes:
1) The speakers in the TV- one of them or both are shorted/blown. This causes a dead short to the mainboard when audio is applied. Try subbing a different pair of speakers (simply tap an 8 ohm pair onto the existing wires and disconnect the factory speakers. If the set stays on- then you found your culprit and the TV speakers are bad.
2) The Mainboard. As the audio out on the main is derived from an amplifier IC driven from the 5 volts on the board. You know the 5 volts is present on the power board since you tested it, so the mainboard's audio output is shorted and you need to replace the mainboard.
If you need further assistance let me know. Please do not forget to click the 5 STAR RATING, at the top of the page for my efforts. It is my livelihood and you can follow up at any time if needed.
Do you need any further assistance with this?If not, could you please click the 5 STAR RATING, at the top of the page for my efforts? It is my livelihood and you can follow up at any time if needed.
Hi, You did not pay "me" $38- you paid the site a deposit. I am not credited anything until you rate me. I told you what is causing the issue above- if it's "not working" then you need to isolate it by trying new speakers, OR disconnecting the speakers entirely in the set and see if it stays running. Once you've gotten enough info to narrow this down and fix it- then kindly rate my service as i am working of my own time here to help you.
I don't know what else I can tell you- the TV speakers are what caused the problem, and you will need to try to retro-fit some tiny speakers into the TV and use them. There's some places you could check like www.partsexpress.com and find some tiny full range speakers- use their site and check the dimensions to see if they'll fit. Other than that we found the culprit so if you would kindly rate the service I've provided so that I am compensated or my time spent working with you.
Rating does not close the question, you can still follow up at no additional cost. All it does is credit me a PORTION of what you paid the site as a deposit. As of now, the site has been paid, but I have been working of my own time unpaid.
Thank you. I cant remember the last time I've been to Radio Shack, so I wouldn't know. I order all of my speaker drivers from Parts Express (as they have a huge selection and much better prices than the "Shack") so that was why my suggestion was to check them out.
I'm going to opt out- perhaps another expert has some ideas? Good luck!
Then this points right back to the audio chip on your mainboard being faulty. No way around that, so the conclusion is that your mainboard IS indeed bad- more so in the audio chip. Solution is to have a different shop test it at length WITH speakers, or live with having it connected to your stereo. Now, I have substantial time with you on this trying to troubleshoot, so was wondering if you could please at this point click a positive rating.
Hello, I just wanted to follow up and see if you received the information you were looking for?