Mitsubishi vs-55707 or vs-50707????? bouncing horizontal lines weird color
Mitsubishi 50 inch rear projection tv. under the signal board it says model # vs55707 but on main board it says vs-50707. manufactured december 2000. the outside rear cover says its vs-50707. I have bouncing horizontal lines, color seems to be off a bit. and picture seems to be shifted down by about an inch or 2. it used to be fine after waiting about 10 minutes or so but now it just stays this way very intermittently. what could be the problem and is there an easy fix?
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there are some capacitors on the signal board that are associated with the pwer supply regulators off the 5 volt and other sources there that need to be replaced
if you have the tools and know how and soldering station you can do the repair your self if not then you might want to contact a servicer in your area i can get you the cap location numbers if you like
That is a VZ3 chassis, similar to Mitsubishi models Ts-4545, Ts-5045, Ts-5545, Vs-4543, Vs-4544, Vs-5043, Vs-5044, Vs-5047, Vs-6043, Vs-6047 and has common failures in the vertical circuit, specifically vert Ic401 which is a La7845 which is usually caused by defective C402 100uf 50v and/or open 1.2 ohm 2 watt R510 next to FBT.
If not that check C268 off Q215 on signal board 22mf/50v and Ic200 on signal module Cxa2025s. However the vertical failure is more likely.
These sets have capacitors that will go bad, but without a good ERS meater that tests these in curcuit you could be spending a lot of time doing nothing, But the most common is to find the 9 volt reg on the signal board and change all within a 2 inches of that regulator
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!