Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
---|---|---|---|---|---|
Sony | KV2649R | INTERMITTENT LOSS COLOR AND HUE CHANGE, REPLACE IC501 | Intmt loss of color/hue change. Chroma and Y do not look likeschematic, signals look trashy, even when video is good. Traced problemIC501, sync out of Pin 15 was varying 2 to 3 times pulse width whenproblem was occuring. | ||
Sony | KV2647R | DARK PICTURE IN SCRAMBLED CABLE, CABLE BOX SIDE PROBLEM | When using a Jerrold model 400 addressable converter allscrambled cable channels were dark. Looking at the converter output on ascope indicated a wide sync pedestal than on standard reception and 1 or 2horiz lines early, when both cable output and broad | ||
Sony | KV2647R | SHUT DOWN, HVR CRACKED | These units would go into HV shutdown intermittently. Thereason is that the HVR block had a hair-line crack. The voltage out ofthe HVR block feeding Q505 would increase up to 30VDC at times activatingprotection circuit. | ||
Sony | KV2645R | DEAD, REPLACED FBT | FBT (2) transformers were replaced the same week on twodifferent units for excessive vibrations or singing. Wedging did nothelp. | ||
Sony | KV1920D | BLANKING BAR AT THE TOP OF THE SCREEN | A blanking bar at the top of the screen approx. 2 inches high.It did not vary with line voltage. Tech. had had some initial verticalproblems. Found only 33V on collector of Q502. Obviously 135V was noton D506. | ||
Sony | KV1915 | POOR CONVERGENCE | Cannot adjust B & W tracking, the convergence changes, andthe only way that the set will come close to being in focus is if thecontrol is all the way to one end of its range. | ||
Sony | KV1747R | NO CENTERING OPERATION | This unit had the picture centered too far left even afteradjusting the centering tap. Shorting L504 in series with the tapprovided enough range. | ||
Sony | KP7220 | FAINT CROSS HATCH ON THE SCREEN, REPLACED D303 | This unit had a faint cross hatch superimposed on picture. | ||
Sony | KP5040 | NO RED VERTICAL CONVERGENCE, REPLACED CRT NECK ASS'Y | The red vertical convergence does not move. Found open coilon the CRT neck assembly. | ||
Sony | VTX1000R | HISS NOISE IN AUDIO | Slight hissing noise in audio only on channel 13. | ||
Sony | KX2501 | SHUT DOWN AFTER WARM UP, Q1520 | Unit would go into shut down after warm up. The shut down wastraced to the hold down circuit, where the horizontal osc. output wasdefeated. Inspection revealed a voltage being developed at collector ofQ1520. All other voltages and devices checked OK. | ||
Sony | KX2501 | DOTS IN PICTURE, REPLACED CRT | With no input signal, even with the brightness and picturecontrols completely off the CRT exhibits about 12 white dots distributedin a random pattern over the entire face of the CRT. These dots willrandomly burst in a sort of fireworks pattern, dispersi | ||
Sony | KX2501 | UNABLE TO CONTROL CONTRAST, REPLACED C1568 | Unable to control contrast. Using pix control found ABL #3transistor reading 3.8VDC, should be 25.2VDC, isolated problem to C1568.Capacitor was read 200 ohms. | ||
Sony | KX2501 | NO PICTURE, REPLACED R761B | Lose video immediately after turn on. Traced video info. upto the base of Q704 and no further on C board. Voltage on collector ofQ713 was about 7V DC and it would not allow Q707 to conduct. ReplacingQ713 would allow video to be present about 20 second | ||
Sony | KV4100 | PARTS AVAILABILITY | Referring to Page 74 of the S/M, servicer claims that mountedon the capstan shaft above the flywheel there is a plastic gear which isnot shown in the S/M. My manual does not show such a gear either. -HQ COMMENTS: The plastic gear in question is a part |