Question about Mitsubishi VS-70705 70" Rear Projection Television

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What causes the image on the screen to jitter

Mitsubishi VS-70705.
What causes the image on the screen to jitter horizontally? It seems to get worst as the TV warms up.

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Sounds like bad convergence ICs. They are complicated to replace but a good tech should be able to do it for about $100. Let me know how this works out.

hardrocko

Posted on Jan 31, 2010

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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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For some reason it started to take a longer time to warm up...


This model has several caps. on the power supply voltages such as the 5v, 9v and 12 v lines that begin to dry out and open and such problems begin to manifest themselves. Most likely this problem will continue to get worse and worse. As far as burned in images there is nothing that can be done short of replaceing all three picture tube and that is very expensive and this unit is to old to consider a 1000.00 repair.

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1 Answer

Jitter and tearing on bright pictures


1. VERT JITTER/HORZ UNSTABLE-CHECK 'GE' CONNECTOR PIN 5 FOR 1VPP Y SIGNAL INTO PIP PCB THEN CHECK 'GE' CONNECTOR PIN 11 FOR 1VPP Y SIGNAL FROM PIP PCB. IF SIGNAL AT PIN 5 IS GOOD AND PIN 11 IS CLIPPED OR REDUCED. CHECK ALL ELECTROLYTICS (I.E.C7001, C7014, C7026, C7036) AND ALL CONNECTING TRACES TO THESE CAPS FOR CONTINUITY 2. HORIZONTAL TEARING, VERTICAL JITTER. SIGNAL RELATED CONDITION. 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).

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1 Answer

Had horizontal Lines replaced now have error 21 xray circuit


White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok
Severe vertical jitter on picture, horizontal sides of picture ragged
Replacing the TDA4950 cured the fault
White line down centre of screen (top to bottom}
Replace C805

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1 Answer

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When it gets better after warm up it can be a capacitor in the 160 Volt high voltage circuit or a cold solder joint. these 2 thinks would be my best guess on this set.

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No picture


When I first turn the tv on the picture comes on for a few seconds then the screen goes to green but I still have perfect sound

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Mitsubishi Model # VS-7085


It sounds like vertical jitters:INSTALL VERTICAL JITTER KIT, PART # KIT-V14VJ . If it gets bright and shutdown then:. CHECK THE VALUE OF R9A45 (180 OHM 1/2W RES.),IF OPEN OR INCREASED IN VALUE CHECK FOR A LEAKY OR SHORTED C9A57 (1UF 350V).AT THE CATHODE OF D9A07,ON THE MAIN-PCB.

Sep 05, 2007 | Mitsubishi VS-7085 70" Rear Projection...

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