TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1547R	Picture blanks	Set would play 15 mins., then would start blanking in and out.vertical would then start shrinking and soon would collapse.
SONY	KV1520R	No volume control	This unit had no volume up. we found d1117 to be ever soslightly leaky.
SONY	KV1355R	Unit goes shut down mode, crack on board	Any movement of cabinet would cause the set to go intoshutdown mode. i defeated the input to the shutdown circuit, pin 17 ofic501 to prevent shutdown in order to isolate the problem. the voltageat pin 16 of ic501 would increase when the problem occurre
SONY	KV1221R	Intermittent turn off, replaced ic001	This unit would intermittently turn off. we found the remotedecoder ic (ic001) to be thermally sensitive.
SONY	KP5040	Noise bar in the center of othe screen, connection change	A vertical bar appeared in the center of the picture whenviewing a normal program. investigation of the circuit revealed that thelot transformer pulse seen at pin 1, of t504 on the e board wasdisplaced from its normal in phase relationship to the flybac
SONY	KP5040	Mechanical incorrect operation, replaced ic6501	Drive voltage to the mirror door motor would not be removedonce the door had reached its end of travel. instead, the drive motorwould continue to ratchet.
SONY	FD20A	Intermittent poor focus, replaced crt	This unit had intermittent focus. the focus voltage wouldgo up to 900 volts.
SONY	KX2501	Pic distortion on ch 7, add ground between "c" and chassis	Oscillation left side of crt, 1 wide, appeared on channel#7 only.
SONY	KV8100	Unit shuts down	When turned on, unit would shut down. isolated problem tothe 22 volt line. it was reading 27 volts. found q602 regulatordriver leaky.
SONY	KV3000R	Unit could not be powered on	Unit could not be powered on. inspection revealed lack of12 volt dc to control circuits.
SONY	KV2650RX	No picture, replace ic002	Vc voltage on chs. 2/3/4 was low - below 2 volts. chs. 5/6and all others were fine. found 4 volts at pin u on tuner.
SONY	KV2647R	Picture distortion, replace c508	Vert. foldover and decreased vert. deflection becausecapacitor (c508) failed. this same capacitor is also failing in othermodels and quite frequently.
SONY	KV2647R	S/m correction, voltage at ic-302 and ic301	Pin 8 of ic302 and pin 3 of ic301 show two different voltages,although they should show the same if they are directly connected, asshown on schematic. -hq comments: your are right. it should be the same (7.2v).
SONY	KV1954R	Squeal, replace l502	Customer complained of squeal from unit. servicer could notlocate as problem did not show up when in service shop. worked withservicer and found we could duplicate problem by putting very slightpressure on the coil.
SONY	KV1943R	Dead, replaced bridge diodes and filter cap	Four times within the past 3 years customer has had to havelow volt diode replaced. found that only one diode at a time was beingreplaced. found filter cap leaky. replaced all 4 diodes along withthe filter cap to help prevent further customer aggravat
SONY	FD20A	Need p/n for removing pin face screws	Servicer has requested p/n for tool to remove pin face screws(p/n 3-314-055-00). tool kit catalogue recommends three types7-700-731-11, 7-700-731-21, 3-832-391-00. will any of these tools do thejob or are we coming out a new tool? -hq comments: a pair
SONY	XR65	Malfunctioning ic303	Ams worked. display would not light up. ic303/q outputalways low.
SONY	XM1	Open q210	After 20-30 minutes of running normal it distorted l. ch.
SONY	WMF10	Incorrect soldering of th901/r904	These units displayed erratic or intermittent speed control.the problem is with the connections on r904 or th901. these parts arenot properly soldered to the board and are occasionally offset.
SONY	WMF8	Plastic eject lever shears off	The eject lever shears off at the end driven by the stop/ejectbutton. the wm-11 eject lever is made of metal. can we substitute? -hq comments: use the metal eject lever in the wm-f8 instead of theoriginal plastic one.