SOURCE: no picture but sound plasma tv
If it is affecting video only, the display's power supply
is probably at fault and without some
technical background and a couple of test instruments, you will not be able to
do the repair yourself.
What you can do though is; unplug the set, let it
stand overnight or at least several hours, remove the back panel and look for
two separate boards with mostly larger components on them; they will have
ferrite core transformers on them and several larger capacitors which are
cylindrical and mounted vertically to the board.
Before touching anything inside, especially on either
board, allow several hours to be safe since the larger capacitors can hold a
painful voltage charge for some hours.
The
section most likely to fail and cause your problem will be one that you see
associated more with the display than the incoming AC line; the latter is the
main power supply and its failure would result in no sound or video.
If you see signs of overheating such as discoloration of
the board material, it may not be repairable but if you can find a part number
on the board, you might be able to buy the power supply and install it
yourself.
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.
SOURCE: Our Big Screen TV a 42
The problems must be trouble shoots by the shop.The priced to trouble shoot and replacing boards should aroud $500-$600 dollars.
SOURCE: My 27" Sanyo DS27800 when
U using the RCA AV cable Y,R,W plug into those tv video input holes wright?Tries another RCA Y,R,W AV cable,see if it work?U have tools like a soldering iron,a roll of solders,also can u do basic soldering?Tries take some alchahol clean the Yellow input hole and take the tv aparts resolders it connections joints,now the video out it should work again,if not yellow input hole might be shorted require replacing.
SOURCE: The sound just suddenly quit on my Sanyo model
Test the preamp outputs - audio/line out - of the TV to be tested on an amplifier . If there is sound then the fault is with the power amplifier within the TV. If not there is fault in the SIF- sound IF and preamap.
To trace you will need to use a signal trace and injection with a voltage check on the output IC. If absent check for open fusible resisitors or if this burns out the IC is short and must be replaced. Check also the speaker.
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