Disconnect it from the receiver it was plugged into
if no problem comes means the problem is due to external interruption. some sort of interference probably with ground looping.
else it is internal.
Most of the flickering also comes from the 75 ohm connector in the back. Wiggle the cable and picture flickers.
coming to internal issue
>>Sounds like a L-MAIN board
>>Could be a bad ground or its picking up some static in the air.
>>Your problem may be due to intermittent power in the backlighting circuit.
This is usually caused by swelling of electrolytic capacitors in the
power board. If you can find an honest electronics technician it is
about a $40.00 fix.
>>try resoldering the vertical output. Its located on a aluminum heatsink.
>>Check the Power Supply board to see any puffed capacitors. If found faulty cap, replace them.
you must get fixed with any one of these above.
thanks for ur patience in reading my solution
hope it helped you
dont forget to accept the solution if u go by it.
thank you once again
have a great day
good luck
http://www.youtube.com/watch?v=rt1282vcX...
have a look at the video
if that is happening what u would do is buy a can of freeze from radio shack and spay the
convergance ic it as soon as it starts, if it comes back to normal it's
the ic's if not try another ic or transistor
http://home.earthlink.net/~oleg.filippov...
if convergence ICs:
Your set needs to have both Convergence ICs replaced they are Both
STK392-010 you can get new ICs at the following link and they provide
free step by step instructions with pics so you can do the job yourself
which takes about 45 minutes. Heres the link.
http://servicemanuals.vstore.ca/
source: fixya co-experts solutions
thank you once again
have a great day
good luck
×
1:Check for poor solder connections on the
sweep/power assembly.
2: Check the fuses on the convergence panel.
Hello
if your set under warranty? - If so please get it replaced.
The CRT's might need to be replaced. That wont be cheap.
in this case I recommend you contact a professional repair man.
The CRT (Cathode Ray Tube) Projection System
When rear-projection televisions first arrived on the scene, television technology was based on the Cathode Ray Tube (CRT). In a CRT-based rear-projection television, three small CRTs (one for each primary color), coupled with a light magnifying lens, projects a color image onto a mirror and is then reflected onto a screen. With the proper video processing circuitry, CRT size, and lens combination, a CRTs can produce excellent high resolution images.
read more here
http://hometheater.about.com/cs/televisi...
I may be mistaken this may be a DLP type television.
Yes I was wrong this is not a CRT type rear projection.
In this case the bulb would need to be replaced.
It may also be a problem in the ballast which powers the bulb might be best to get a repair man inspect the television.
×
The problem in your tv is not external.
The problem is in the power supplies internal filtering.
On the primary side of the power supply main board you will find
a large electrolytic capacitor very near the fuse and the primary transformer( the small one). Next to this capacitor you will find a
large 5 watt diode.( black with a silver band at one end). Next to this you will find one lone 1/4 watt resistor. This resistor in conjuction with large electrolytic capacitor is responcible for the internal filtering of the high voltage side of the board. As your unit heats up( anywhere fron 5 to 30 mins) you will notice horizontal
flickering and prior to that red or green or even purple pixelation.
Check this 1/4 watt resistor for dark discoloration and or a bad solder joint on the solder side of the board. This resistor
is directly responcible for controlling the bias current to the high voltage regulators for the 160 volts DC. At no time should you handle or troubleshoot this board with the line plug in.
Even when this board is powered down that capacitor still holds a charge for up to an hour and can knock your you know what
in your sock. If you do not feel comfortable please take the board to someone else. Hope this helps.
The most common problem of picture flickering,its by a power supply problem ,the solution is to reheat all the the power supply section and of horizontal section also. so flickering will gone.
If
still under warranty or if you have no electronic repair experience you
should take the set back to the shop or to a repair person. Some of the
solutions described below can be dangerous, TV's are very hazardous to
service. Even when plugged out, TV's can store very high voltages.
The
five blinks(count them again just to be sure) is an error codes that
stands for the following: "FIVE Blinks---AKB circuit (AKB), the
timer/standby indicator blinks for about 30 seconds then goes to the
self-diagnosis function. Something is wrong with the video. Check video
out, Q705, 732, 761 and other components on the C board, also check
Q218, 219, 220 on the A board. Also unit be in IK blanking, try turning
up screen slightly."
So what is the AKB? It is Auto Kine Bias;
a circuit that holds the video OFF until the picture tube (kinescope)
is warm enough to run video. So, if there is trouble within the AKB it
may not be turning on the crt. Or, the crt could be cold, or there
could be power supply problems (which I favor because the audio is
gone, too, which means it is not a "video only" matter).
Therefore, I do not favor replacing the C board (or A board as
indicated in the url above). I favor finding out why the AKB circuit is
not functioning.
It is necessary to get the set to come ON
long enough to make sure the crt is heating up. You may have to
manually defeat the protection circuit and force the set to come ON. If
you can find the ON relay you may be able to hold it ON manually - at
least long enough to find out more symptoms, but not too long or some
further damage may occur.
Go to: http://www.schematicsforfree.com/archive... where you may find a schematic or service manual for this set - or one that is close/similar enough to be of great value.
Last comment: Some sets will, upon failure of the AKB function, after a
few seconds, go into diagnostics - which is similar to protection. So,
the audio may be working okey. Turn the set on with the volume up; if
you hear audio for the until the set cycles into the flashing light
routine it means the audio is really good. So, check that carefully.
You may have to do a hard reset to cause the AKB function to reset. So,
do this: Unplug the power cord for 4 hours or more. That will reset
everything.
Hope this helped, or gave you a general idea, but please don't take a further step unless you know the safety issues involved.
Good luck
×
Hello lanrob!!!
Many problems are due to poor connections. Don't just check your
connections, unplug the cable, clean the ends and the contacts on the
components if necessary with "isopropyl (rubbing) alcohol" and if
possible "reverse" the ends. Put what was at one end into the other
component. Make sure that the "colours match". Red-red, Green-Green,
etc. Make sure the cables are inserted all the way. Often, if the
connectors are very tight, people don't insert all the way. Check every
connection - don't forget the ones coming from the wall.
Regards
Smilemaker
53 views
Usually answered in minutes!
I DISCONNECTED AND RECONNECTED ALL CONNECTIONS AND MAKE SURE THEY WERE CLEAN AND CORRECT. STILL HAVE THE SAME PROBLEM. IT IS LIKE LIGHTENING FLASHES. IT DOES NOT COVER THE WHOLE SCREEN.
WHAT DO YOU MEAN BY REHEAT THE POWER SUPPLY SECTION
STILL HAS FLASHING
I DID ALL OF THAT
STILL FLASHING
WHAT ARE CRT.
×