TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	SLHFR30	Unusual failure of brake solenoid	First three units received for service all displayed sameproblem, open solenoid.
SONY	KV1311CR	Rf bleed through when in rgb mode, readjusted rv709 & rv443	Using an ibm pc hooked up to the rgb/digital connector onthe side of the kv-1311cr and having an antenna hooked up to the tv input,with the computer turned on there was rf bleed on the screen. looked atthe possibility of ic401 on the b board to be the c
SONY	TCW7R	No record dub/line in record	Poor connection between plug and plug wire where wire is pressfitted to connector. this resulted in no record dub or line input record-ing. found problem by signal tracing to l107 and ry501 not energized.found q822 switching but not q504.
SONY	XR15	Wiring diagram of front end block is incorrect	Wiring diagram of front end block as shown on page 16 of thes/m is incorrect. pin numbers are backwards: i.e. #1 is actually #6.diagram attached to original. -hq comments: we will issue a s/b.
SONY	AVU270	B+ and power ry are reversed on schematic	Two lines on the outlet board labeled b+ and power ry(audio schematic, section g-11) are reversed with respect to each other.+12 volts should be connected to the cathodes of d901, d902 and powerry control connects to the anode of d901. -hq comments: thi
SONY	CPD1201	Screen is blue and dark	Screen is blue and dark. has also occurred on cpd-9000.
SONY	KV25XBR	Coarse picture	Coarse looking picture and improper interface.
SONY	CCDV8AFU	Camera oscillator failure	Camera attempting on run at 50% increase in sweep frequency.
SONY	TC250	No part number for j4 capstan idler assy	We need part number for j4 capstan idler assy on page 15. -hq comments: part number is x-0027-003-0.
SONY	KV25XBR	Dead set, replaced q1524	The horiz. output device q1528 would short out shortly afterturn on. if set was operated with 90vac applied, you could service itwithout immediate failure of q1528. waveform inspection revealed distor-tion at collector of q1528 relating to problem in d
SONY	CCDM8	Camera power dead, f002 open	All seven units had same problem, camera power dead due toopen f002.
SONY	CFSW30	Wrong part #	M901 and m902 should be two different p/n because one motorgoes cw and one motor goes ccw.
SONY	CCDV8AF	No eject	Tape jammed in the unit. the loading ring was jammed in theloading end. when i removed the tape, i noticed the tape was broken.
SONY	KV2682R	No functions, resolder connector wires	Set could be turned on. color, hue, sound, etc. would notwork. traced signal md1 from ic101 up to ma, mb board, but nosignal return key 1 or key 2 back to ic. removed front panel and setstarted to work. we either had a pinched wire or cold joint.
SONY	SLHF300	Audio interference in picture	No beta hifi recording carrier wave 2 or 4 on pins 11 and 9of ic3 respectively.
SONY	CFSW400	No part number	Missing p/n of cabinet ass'y in s/m. x-3327-907-1 silver x-3327-908-1 black -hq comments: we will issue a s/b.
SONY	STRVX550	Premature speaker protection	When four speakers were hooked up, the unit would prematurelydisengage the speaker relay - about 20db setting. we found c721 to beopen and causing the problem.
SONY	SLHF300	No horiz sync in cue/rev	The unit intermittently would loose horiz. sync in the cue/revmodes. we found q504 to be thermally intermittent which allowed phaseoutput to be mixed in with the c/r adjustment.
SONY	SL25	Incorrect capstan free speed (picture distorted)	The capstan was running at the incorrect speed in bi, ii, iii.the problem was caused by ic401/pins 52, 53, 54 putting out the incorrectlogic. this is the first time i have seen this happen with this ic.
SONY	KV4000	Intermittent band switch	The unit would intermittently not go into vhf high. we foundic102/band switch to be the cause.