TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2649RX	No function, replaced d021	Set cannot be turned off, except by the master switch.channel up/down, volume up/down, picture, color etc. do not work. foundd021 leaky.
SONY	KV2602	Vertical distortion, replace c516	This unit would play for approx. 20 minutes with no problem.after the circuit had sufficiently heated up the vertical would start tocollapse until there was only about 1/2 inches of deflection. we foundc516 to be defective. monitoring the resistance ac
SONY	KV1975R	No vip function, replace ic103	The above 6 units came randomly in a period of 2 weeks from2 servicers (all in the city), for no vip function. two could be resetfor vip, the rest remain with no v/p function. acquired a few new chipsand installed with very good results (cx-520-111n).
SONY	KV1913	No sound	No sound, but picture ok.
SONY	KV1554RWP	Intermittent on/off	Will come on intermittently.
SONY	KV1354R	Dead, replaced ic-003	This unit would not turn on and all other functions wereinoperative. we found ic-003/pll controller to be defective.
SONY	KV1221	No tuner lock in, replaced n2503	This unit worked fine except that intermittently the tunerwould not lock in on the c position. when the n position was selectedduring the failure mode then the c channel information would be present.we found the neon lamp n2503 to be the cause of the pr
SONY	KPR4600B	No picture	Set would lose display and scan channels. no picture.traced problem to open t502.
SONY	KP7220	Erratic tuning and distorted picture, replaced r547, r546	Picture is dark and shrunken in on sides, will not staytuned on channel selected. tuning is erratic.
SONY	KX2501A	No sync, remove copper insert from u1001	There have been several units brought into the fsc for repairwith the symptom of no sync. the problem has been traced to theprotective insert installed on the u1001 input terminal. this plug shortstogether pins 1 and 18. this turns on q1329/sync switc
SONY	KV2675R	Snowy picture, q-201 uhf amp on "a" board	Picture was snowy on both vhf/uhf.
SONY	KV2675R	Crt arcing and vertical roll, crt socket	Set would arc (more like a loud tick noise) then picture wouldvertical roll for about 20 to 30 seconds, until the next ticking noise.
SONY	KV2650R	Snowy picture, replaced band switch ic002	The set would occasionally tune in the vhf low channels. allother channels were snow. we found the band switch ic to be defective.this is becoming more common problem with the units using the la7920 ic.
SONY	KV2649RX	Mislanding, removed short	When viewing pix at low brightness, the edges of the rasterappeared reddish in color. inspection revealed slight distortion in redinput signal to video drivers. i found the output terminal on the avboard had a lead shorting to the junction of r12 and r
SONY	KV2649R	No vertical deflection, replace c508	The set had two problems. no vertical deflection. thewaveform at pin 7, ic502 was pulsing, all the voltages were fine. foundc508 had a 47uf instead of a 1uf that the manual calls for. the secondproblem was no high band. found the uhf and vhf output
SONY	KV2145R	No v deflection, replace q502/503 & r520/r555	Vertical problem.
SONY	KV1961	Sputtering of the audio, replaced lamp	On channel 7 only, you would hear a sputtering of the audio.
SONY	KV1952RX	Dead, replace hdt t501	Unit came in dead, found horizontal output (2sd1938) shortedand fuse open. after replacing output transistor and fuse, foundincorrect waveform on horizontal drive transistor. found hdt (t501) tobe defective.
SONY	KV1946R	Intermittent shut down, leaky d502	Unit would shut down intermittently.
SONY	KV1924	Spot burning on crt	Set came in for a burnt spot center of screen (size about1/8 inch). servicer replaced picture tube and after two months set camein again, same problem with new tube.