Horizontal lines began slowely but as unit warmed up screen was clear.
SOURCE: Mitsubishi TV Model VS-7083
The deflection board and/or smps have most likely ring-cracked on one or more components on the board due to heat stress. It's not an expensive fix at the moment, but continuing to operate it this way will place additional stress on components like the regulator and they will eventually fail...
If you're taking it into the shop for this repair also discuss with your tech to do the following per Mits bulletin: APPLY FOLLOWING CIRCUIT CHANGES ON PCB-SIGNAL: A. REPLACE R2K8 WITH A 1K RESISTOR (BASE OF Q2B2). B. REPLACE R2K3 WITH A 47 OHM RESISTOR (IC201 PIN 50). C. ADD A 100PF CAPACITOR FROM BASE OF Q2B2 TO JUNCTION OF R2L0 AND R2K6 (GROUND).
Have a great day!
Bill
SOURCE: Horizontal Lines On Screen
horizontal lines = horizontal sync off . mitsbishi always seemed to have this problem .. on the older sets I would take the back off and inside deep on the board i would adjust a pot and sync it right .... and never had a recall, maybe your newer model has this too .. this little control,
but its a horizontal sync problem.
if no change the horizontal processing ic.
SOURCE: blue screen with flickering horizontal lines
Sounds like the 1000uf capacitors on the FMT board need replacing. This is a common symptom with that chassis. There are three 1000uf caps that fail on that PC Board
SOURCE: Mitsubishi TV had horizontal lines across the screen and rolls up
Answer
ONE: Yes, the speaker mounted close/near to the set
can be a cause of mischief; please move it further away and see if that
helps clear up the problem. But, you must keep it away for several
days before you will know for sure because it takes some time to
degauss all the internal parts that may have become corrupted by the
magnets in the speaker.
TWO: Yes, any set can be repaired the question is cost and wisdom.
Old sets are sometimes not worthy of the repair simply because of the
likelyhood that another failure will follow soon after. A big screen
always invokes a repair charge of $200 and up. After a few of these you
will wish you had put all the money into a new set!
THREE: The lines are most likely a problem in the vertical blanking
circuits of the set. These are horizontal retrace lines that are
supposed to be blanked out during vertical retrace of the raster.
Think of it as a paintbrush that scans across the screen painting thin
lines and when you get to the bottom of the screen it goes quickly back
to the top, but during that time the horizontal, which is many times
faster, has made several sweeps; so it must be blanked out during the
retrace. The repair involves finding the guilty parts and replacing
them. Usually this repair runs over the $200 somewhat.
FOUR: Prior to calling in a service tech try a hard reset to see if
that will recover any of the circuit degradations. Merely unplug the
power cord and leave unplugged for 4 hours or more. It may help. Or,
it may not help; but worth a try since is won't cost you anything.
If the set is over 5 or 6 years of age it probably is not a condidate
for any expensive repair. On the other hand, it is a Toshiba - and
they make a fine set.
Hope this helps. Let me know if you have further thoughts.
SOURCE: Black horizontal lines. Looks like I am looking through venetian blinds
OK this problem is caused by a failing electrolytic capacitor back in the power supply. It's job is to filter AC interfence from that voltage source. Locating the correct capacitor is something not for a do-it-yourselfer. A respectable tv shop experienced with Mitsubishi tv's can usually repair this problem in your home. Average repair cost would be between $200 and $300.
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