Question about Toshiba Televison & Video
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Posted on Jan 02, 2017
There are a couple of things you could check on this one if you have the equipment and are somewhat skilled in electronics.
Take a test meter if you have one, if not try the local radio shack. Unplug the set and remove the back. Locate F802 a small pico fuse in the SMPS 4a/125v. Test this for open - if open replace it...
Next locate Q472 ( 2SC1740 ) a common NPN amp transistor which will cross to NTE85 in a pinch. This transistor is in the shutdown circuit and if it's failed usually causes the conditions you have there..
Try at least these, and if anything here sounds the slightest complicated take it to a shop - it should be a rather inexpensive repair...
Posted on Nov 17, 2007
Did you check the supply fuses to the convergence ICs? Did you check the output resistors
other wise i would replace the convergence ic first.
Posted on Jan 08, 2008
tart checking the cable connection to receiver, try moving or replacing cables.
If you have a surround with external speakers check surround connection cable and speakers wiring.
If the cables are OK, then the unit may be faulty.
In that case the fault can be either the audio board (often audio circuit is integrated on the main board) , or the sinput output signal board.
Also a contact on connection to internal speakers can give you same problem.
Posted on May 22, 2009
The power light is using the same small 'always on' power supply that keeps the infra-red receiver for remote functions alive too.
It is likely that the main power supply is sick and will need repair or replacement.
This is probably a separate board (these are often outsourced to specialty companies) and should be user replaceable once you identify it.
What you can do is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for a separate board with mostly larger components on it; it will have a ferrite core (no laminations as with a line-frequency part) transformer on it and several larger capacitors which are cylindrical and mounted vertically to the board.
Before touching anything inside, especially on that board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.
If you see signs of overheating such as discoloration of the board material, the PSU may not be repairable but if you can find a part number on the board, you might be able to buy the power supply from the mfr.(or company linked below) and install it yourself but it will likely have the same problem eventually unless they have altered the design or improved component quality.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the main power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload and the power supply for the backlight may be at fault.
Possible board source:
Posted on Nov 23, 2009
Testimonial: "great information! thought it might be power supply but needed expert view and advice. Thank You very much."
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