TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	ICFC411W	Incorrect part number - reversed	Incorrect part number - reversed.
SONY	ICFC410W	Defective d4	Continuous hum as if bad filter capacitor caused by shorteddiode, d4 replaced d4.
SONY	ICFC33W	Display too bright	Customer complains that display is too bright and wants toknow if his unit can be modified to correct his complaint. -hq comments: safety regulations do not permit changing the value of thecomponent that controls lamp brightness.
SONY	ICFC15W	Defective power transformer	Dead. check for hum in radio when repaired.
SONY	ICFC15W	Defective ic - mm5387n	Hour numbers jumped from 4 to 7, 8 back to 7 instead of 4, 5,6, 7.
SONY	ICFC15W	Short in pcb	No clock read out. voltage on grid too low.
SONY	ICFC11W	Poor contact	No alarm, switch was not making proper contact.
SONY	ICFC11W	Poor connection in switch	Cannot set alarm.
SONY	ICF9650W	Crack in pcb	No sound, dial lamp lights, found no b+ to radio.
SONY	ICF9650W	Breaks in pcb	Circuit board broken at 3 out of 4 places where circuit boards mounted on front panel. no damage visible on main cabinet assy.,packing or box.
SONY	ICF9650W	Cold solder joint t404	Hum only, no am, no fm, b+ for radio was only 1.5v insteadof 7.5v.
SONY	ICF9650W	Break in pcb	Dial light works, no sound.
SONY	ICF9530W	Missing p/n	The volume control part number is missing from the s/m.
SONY	ICF7750W	L17 needed redressing	No weather band reception and dead carriers at intervalsacross high vhf band. only sound of 2 local tv stations came through.
SONY	ICF7750W	Leads become loose	No sound intermittently because the audio output transformerby its very weight had caused its secondary leads to become unsolderedfrom the board. if this transformer were held in place by tabs as aretransformers used in color tv's, this problem, i feel,
SONY	ICF7370W	Missing switch arm	Radio would not switch from fm to psb band.
SONY	ICF7280W	Cold solder joint on ct4	No am.
SONY	HST49	Leaky cap	Unit came in with no am and no fm. the amplifier and tapeportion works fine. checked b+ at pin 7 of ic101 and found 18.5v (nocurrent draw by ic). replaced ic101 (cx-168), still no am or fm.
SONY	HST49	Defective tuning cap	After 15 minutes of operation, am section stops operating.
SONY	HST49	Defective q901	Output ic (501, 601) failure. a hole was found in ic's afterthey failed.