TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1945R	Picture distortion, replaced hlc	Complaint about horiz. linearity specifically when writingtransversed screen. replaced hlc with p/n 1-459-136 (hlc from 1930r).problem resolved. expect inductance of hlc (1-459-316) too low. pleasesupply definite fix - have had 3 complaints to date.
SONY	KV1923	Sound distortion, replaced d2006	When set was first powered up, volume was maximum and couldnot be lowered. unit was turned off and restarted with no sound now atall. checking output of a/d convertor, tns3701bns, found no pwm signal.measured standby supply voltage, pin 8, with power o
SONY	KV1722	Set fails after a few days, replaced r569	Intermittently this unit would fail after servicing for astart circuit problem anywhere from one week to two months later. theunit had been in 7 times in the last 6 months. after running for aconsiderable time under a heat lamp the voltage at the colle
SONY	KV1207	Poor vertical	Vc amp leaky. repaired by replacement q101, 2sc1815 withreplacement 2sc1364. unit was ok for 6 weeks, then q101 failed again insame way. replaced and checked circuit. found no reason for failure.perhaps static problem. enclosed you will find the ori
SONY	KP5040	Test signal interference, install cap	Cross hatch bleed through on kp-5040. bar pattern when view-ing a weak incoming active channel. this condition sometimes can be moreeasily observed by setting the tv line switch s907 to the line position.in this configuration a faint bar can be seen ru
SONY	KP5040	Picture distortion (oscillation), add cap	Oscillation (snivet) down center of screen noticed on set inclose proximity. also had white horizontal lines similar to ignitionnoise.
SONY	KP5040	Color distortion, replaced ic3301 and crt	Red very weak, unable to set gray scale. bias wrong onpicture tube. changed ic3301 corrected bias, but red picture tube bad,had to change it too.
SONY	KP5020	Incorrect convergence	All three colors would not center properly. found d5501shorted on da board. also schematic is labelled wrong, voltage afterresistor r5597 should read +5 volts but schematic indicates +12vdc onda board.
SONY	KX2501	No color, replaced ic1302	No color under any input, faint retrace lines in black andwhite picture. sometimes flickering of colored snow but out of colorsync.
SONY	KV9000	Tv would not come on	Tv would not always come on. found c508 intermittently open.
SONY	KV2648R	Color confetti on b/w, adj cv301	Color confetti on b/w telecast.
SONY	KV2648R	No picture, replaced f601, q602 and q603	This unit keeps on blowing f601 and q602. isolated problemon the f board by disconnecting the 135v b+ and supplying a separateexternal b+ (tp92 was the ground return) to the a board. this makes thea board work. hv normal but no raster. then by using
SONY	KV2648R	No manual operation, replace c4038	You cannot turn set on or off by manual button. set wouldwork ok with remote. i found no logic high at pin 33, ic4001. capacitorc4038 was shorted on mz board.
SONY	KV2648R	Bottom of screen blank out, replaced cx841	Bottom and left side area of the screen blanked out. foundcx841 defective.
SONY	KV2647R	Black line on the screen, replace v out ic502	After set would warm up a black line about 3/8 inch (veryfaint) would appear in the center of screen.
SONY	KV2647R	No operation, h out q-502	No sound, no picture. found horizontal output shorted.
SONY	KV2643R	Vertical bars on the screen, replaced c539	Vertical bars on left side of screen. almost like ringing.horizontal spike riding on b+.
SONY	KV2602	Vertical jitter, replaced c511	After 5 to 10 minutes on, vertical jitter is noticed andbecomes increasingly severe. sometimes a brighter line is apparent acrosscenter of screen (slight folding). found c511 2.2ufd at 20v tantalumcapacitor very slightly leaky (100k).
SONY	KV1943R	Intermittent sound, replaced t207	Sound intermittently goes dead. troubleshooting indicates that the sound is not passing through the if section. isolated problem to t207.
SONY	KV1923	Picture noise	Retrace line.