- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Recently a 3 year old VIzio TV I bought started having problems. The set would turn on normally for a few seconds then the picture would go dark with everything else operating normally including sound. Remembering a similar laptop computer problem I diagnosed previously, I immediately suspected a defective TV screen backlight. To verify this in your own TV, get a very bright flashlight and with the TV operating in the failed blank screen mode, shine the flash light into the blank screen from various angles and distance (including touching the screen). If the LCD is still operating, you'll see a dim motion in the flashlight's reflection, thus proving it is indeed a failed backlight.
I had a similar problem with blacks showing up as green. Turning up the brightness a bit fixed it for me. Not a permanent fix, but something to try if you want to make it last a bit longer until you can get a new one or fix it.
Same RCA RLC1906 LCD T.V. "Same problem"; working normal shutoff, and never came on again; just white screen.Took off back cover to inspect "CAPS"... all looks good. To this point only thing that seems odd is resistance varies 50ohms between diods D5, D6, D7 on main power supply. On another note our tv was supposedly a refurb yet considering that fact; I closely inspected all three circuit boards, and none show any signs of repair, meaning everything appears new, original. If the capacitors are blown it should be pretty obvious by swelling or leakage. I don't see any of those obvious signs of heat damage. Diode's don't appear shorted when reversing polarity but D6 specifcally tests just over 600 ohms, all others test just over 550 ohms though I believe they are all suppose to be identical value. Perhaps that helps but I am going to try replacing diodes first and retry as it does seems power supply is also connected to video input/output which I would think is inverter board!
I believe you have a shorted transistor on the crt board on the back of the picture tube which should be Q5104. Let me tell you my experience with these Zenith's The original problem is the picture tube shorting out and caused this problem. If you replace the transistor the same problem could arise again because of the tube and it could even knock out the main board power supply. I have seen this happen. And I have put in the transistor and no problem. You can get one at the Radio Shack by taking the bad one out and get them to cross reference it for you. All Zenith transistors have a prefix number (not on the transistor) which is 121- (with the dash!) and the number on the transistor The new one must go back in the way it came out! I recommend someone with electronic soldering and desoldering experience. Hope this helps