Repair Tips

Search:
Results: 87710

Make	Model	Symptom	Problem
SONY	KV1546R	Bloches in pix and unstable, changed value of r555 to 82k	Screen has oval blotches with no info and will increase insize with signal received. originally had 100kΩ res. installed, aftercomparing with a kv-1547r with a 30p chassis we noticed it had an 82kΩ.
SONY	KV1514	Black bar on the screen	Black bar, about 3/4 inch wide on left side of screen. blackbar would start bottom left corner and extend diagonally to top. byhitting front of pix tube i was able to shift bar from left to right, incheach way.
SONY	KV1222R	Doors do not stay closed	The tabs on the front door that fit into the spring loadedlatch on the mask are not long enough nor are they notched. the doors donot stay closed but rather flop open. the tabs on units whose doors stayclosed are longer and are notched on the right han
SONY	KPR4600	Convergence distortion, replaced ic-5505	Unable to correct severe keystone error of red and bluepattern. red was more severe. waveform at base of q5510 and q5517 wasdistorted, namely the right portion of vertical deflection was missing.this distortion was traced back to output of ic5505.
SONY	KP5040	Intermittent mechanical operation, replaced ic6502 n s953	Intmt operation of the mirror assy which was not related tothe load on the motor/mechanism. the tubes were lubricated and movedfreely, mirror was removed. actually the voltage to the motor droppedfrom normal 25v close to 0v and the motor would coast to
SONY	KP5040	No channel lock, incorrec ic001	This unit would not skip channels or operate on uhf onchannels 83, 84, 85. the tuner switched back to vhf-low operations.we found the incorrect upc installed. it was upd553c-056.
SONY	KP5020	Noise lines on the screen	This unit produced a drive line at the left side of thescreen on all three tubes. this was also radiated to any nearby sets.the problem appeared to be located on the board. however we found thedrive line to be caused by a noisy stopper diode - d5313.
SONY	KP5000	No channel lock, replaced q2207, q2208	When programming the set, tuner would not stop on thechannels. we found a constant h (12v) at pin 4 of ic2202 (neon drive).we traced the problem to a leaky q2207/q2208 sync detect/clamp circuit.
SONY	KX2501	Shutdown, replaced q653	Set would work for about 2 minutes and then q652 would getvery hot and short out. inspection revealed e to b open on q653, pulseamplifier.
SONY	KX2501	No power, replaced c657	Q652 shorts at turn on, extremely difficult to service thispower supply due to immediate failure at turn on. used the followingprocedure to repair the set: connect 22vdc to junction of r667 and r677.also connect jumper from this point to 320v line. co
SONY	KX2501	Squeel, replace pot	Customers are objecting to the 15,734khz squeel. the noise ismost evident when the viewer is adjacent to or 45 off axis to the set, andduring the first 10 to 15 minutes of operation from a cold start.
SONY	KX2501	Dead, intermittent solder connection to emitter q1501	Found this unit to have a shorted horiz. output and converter(power supply). we traced the problem back to a loose connection on theemitter of the horiz. driver transistor.
SONY	KX1901	No blue on rgb input	No blue on rgb input. writing from computer comes out yellow.
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.