Question about Sony Grand WEGA KDF-50WE655 50" Rear Projection HDTV

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My LCD only shows a blank bright white screen

After normal use last night, tonight, the tv powers up but almost immediately turns bright white. I can not change video source, channels, volume... nothing... it is like it is frozen... HELP!

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  • 11 Answers

Power Supply board.

Posted on Dec 13, 2007

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Posted on Jan 02, 2017

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Dec 16, 2015 | Televison & Video

Tip

Diagnosing a LCD blank screen problem.


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.

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When I turned my Sansui 19


Chk all cabling for a short at back. If disconnecting cables turn off tv 1st.

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I have an LG 42LB5D LCD HD TV that has just developed a blank white screen for television (cable) broadcasts. The audio is still fine. The DVD shows up fine. And, the PIP small screen works. This occurred...


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I purchased an rca rlc1906 19" tv 2 months ago, worked fine when i turned it off last night, when i got home from work tonight i tried turning it on. but all i had was good volume but had no picture,...


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!

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Acoustic Solutions TV/DVD P1480 has stopped working


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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

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Hello, please contact your Philips Dealer ASAP. If you need more info please advice. Best regards, Arpi

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