Question about Toshiba 55ZV650U 55 in. LCD HDTV
We have re placed the main board and the power supply board and it is still doing the same thing. What do we need to check or do next?
Ok, does it have audio? If you have audio and no picture, you could have a backlight problem or a defective T-Con board.
Posted on Jan 05, 2013
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Posted on Jan 02, 2017
SOURCE: Snowy black picture
I would think that the signal board would be more suspect than the hyper board for the symptoms you're describing. However I would recommend getting the service manual and doing some troubleshooting rather than just replacing circuit boards.
Posted on Sep 11, 2008
Resetting the TV
Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can saved time.
1. Unplug the TV power cord from the power outlet for 3 - 4 hours.
2. Unplug any connected devices (DVD, Set-top boxes, etc...)
3. Press and hold the TV power button for five seconds.
4. Plug the TV power cord back into the power outlet and turn on the TV.
5. Open the on-screen menu to confirm that the TV is responding again.
6. Turn off the TV and reconnect the devices.
7. Turn on the TV.
hope this may help;
Posted on Sep 13, 2008
if you was to leave it plug in and about 1 to 2 hours do it turne on if so you need to have the power rebuld
you could have bad caps in power suppy but it sound like a bad power suppy
Posted on Nov 11, 2009
SOURCE: I have a Toshiba 42hl67
The point is that with LCD TV (which are very different from computer repair) you often need testing before finding the fault. In this case you have replaced amost everything, the fault then is either the T-con, the main boardm (which are only parts with panel and chassis that you have not replaced), or one of the parts already replaced that had failed because of incorrect installation procedure.
Since it is very easy to fry a board, and since a technician diagnosed the inverter (I assume that they tested the TV), testing will start right from the inverter. The inverter is tested reading DC in from main board to master, dc from master to slave, and AC high voltage out from slave, which hosts the oscillator section that should also be tested using an oscilloscope.
Since the TV is in forced standby (protection because the fault is detected), in order to get DC to inverter from main, the control line to correspondent DC voltage from PSU must be activated. The inverter voltage is the higher DC line from PSU. This is activated jumping the control line with the 3.3 or 5V low DC from PSU. In this way both PSU and inverter get tested. The procedure is also a superficial test for some main board functonalities. This kind of test is done with live power and involves testing high voltage lines. For safety reasons the operation must be done by a trained person.
The alternative is once again taking a chance and replacing main and T-con, but as said, that is not a good way of repairing a 42'' TV.
Here parts for this TV.
Posted on Dec 06, 2010
it is definately the main board buddy the power board will be fine what it is there is a common fault with this model of tv the boards are faulty on the earlier models ive seen this plenty times before i am a tv technician
Posted on Jan 20, 2011
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