TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	CDP101	Defective crystal	1) disc motor would run at power on. 2) no loading orchucking operation. 3) sometimes pause and play, leds would light.4) sometimes drawer would open partly.
SONY	XR85	Loading drive belt stretches	Loading drive belt stretches and belt will slip. when thebelt slips the cassette will not load.
SONY	XR85	Incorrect part number in manual	A tech. ordered a volume control (r/n 502 in the s/m) by theparts number 1-228-735-00 but he received the part 503, instead.
SONY	WM10	Cold solder joint on flexible board	Unit stopped rewinding or fast forwarding several secondafter pressing rew or ff button. found cold solder on the flexible boardbetween s901 and r634 as indicated in the diagram.
SONY	TCK88B	Unit out of adjustment	Dealer complained of gross wow and flutter. verified problem,measured 0.6% jis weighted.
SONY	TCK88B	Loose wire between servo board and syscon board	Counter was intermittently not advancing. determined thatic602 derives count from supply reel revolutions using output of q536 andq535 on servo board.
SONY	TCFX77	Missing part # in manual	There is no p/n for the capacitor c134, 234 (56pf/500v),which are connected to the r/p head, in the service manual.
SONY	TCFX44	Defective relay	Erratic system control operation. when record button isdepressed, unit will intermittently enter rewind mode after 2-3 sec(record deactivates). results from high resistance of relay contacts.
SONY	SPP11	Service manual instructions	P31. lacking a linear detector, i adjust rv2 to energizebase relay.
SONY	SPP11	Service manual instructions	P10 of service manual instructs tech. to turn rv6 ccw forfreq. adjustment. it is my belief that it should read rv5, instead.
SONY	PSX800	Glue on s/n 800439	Intermittent cue up/down malfunction. symptom was no dampingaction. checking output of vert. mfb det coil with scope showed inter-mittent no signal or noisy erratic signal. tan glue on the solderpads of the coil's pcb in the bearing assy caused proble
SONY	PSX800	Open lead in s/n 802218	Intermittent cue up/down malfunction. symptom was no dampingaction. checking output of vert. mfb det coil with scope showed inter-mittent no signal. an open lead, confirmed withΩmeter was the cause.
SONY	KV1222R	Bright picture with retrace lines	Set would come on ok when very cold. then after abouta minute, pix would get very bright and have retrace lines.
SONY	STRAV880	No power - unit dead	Unit had no power - completely dead.
SONY	D7	Insufficient line muting	Insufficient line muting. when pushed, line output wasreduced by better than 40db but not totally muted. signal level slowlydropped off from this point and finally muted completely after severalseconds. the effect was not noticeable on headphone outpu
SONY	KX2501	Dead, connector shorted,also replaced q652, q651, and q653	Set came in dead. found connector shorted and q653 and q651reading 40Ω between base and emitter (forward and reverse the same).
SONY	RM708	No commander operation	This remote commander produced no infrared output. thetransmit indicator did light.
SONY	KV2650R	Aft drift, leaky q024	When you tuned a station it appeared as if the aft wassearching before it locked in on the strongest portion of the signal.vc was changing slightly before it locked.
SONY	KV2649R	No sound, replace ic605	No sound in left or right channels.
SONY	KV2648R	No bar display, replace shorted q4028	No bar display in any function except if volume was atmid-range. picture control would increase or decrease length of bardisplay. with color, hue or brightness there was no bar display.pressing hue, bar was all green. checking input to counter reset,