Dicas Reparação







Pesquisa: KV2670R

Resultados 33

MarcaModelo
(Chassis)
SintomaCausaSoluçãoPor:
SonyKV2670RRETRACE LINES AT TOP OF PICTURE, REPLACED C520 & C542 TV shows white lines on the top of screen.
SonyKV2670RBEAT PATTERN IN PICTURE/PIC. DARK/LOOSE TUNER/SOUND BREAKS All problems above occurred because loose connections on +9Vregulator Q-204. The high resistance connections caused the 9V DC levelto vary between 9 and 4vdc. Thus causing the tuner chroma/luma jungle ICand audio circuits to do many strange things.
SonyKV2670RNO PICTURE - NO SOUND, D-102 5V REG SHORTED No picture and no sound. Sleep light only. CPU had no dataoutput. The pulse from the vertical was there but its amplitude wasreduced by about 50 percent.
SonyKV2670RINTERMITTENTLY TUNING DRIFTED OFF, LEAKY C-202 Intermittently tuning would drift off. Found that when we usea tuner sub that the AFT pins out of VIF chip would change. Pin 6 of IC20would go approx. 5VDC. This was what was driving the tuner off station.Pin 5 was 0V but pin 7 which should be 3.6VDC
SonyKV2670RPICTURE SHRINK VIRTICALLY, IC-301 REPLACED This TV had a raster shrink virtically (2 inches from topand 2 inches from bottom). Vertical size control RV502 had very littleaffect.
SonyKV2670RINTERMITTENT VERTICAL JITTER ON TAPE, R-854 VALUE CHANGE This unit had an intermittent vertical jitter on copy guardtapes. The tape I viewed was MCM home video - MASK. The vertical jitterwas worse in the beginning. The tape was played through two SL-HF900and an SL-HF600 with the same results.
SonyKV2670RSYSTEM CONTROL LOCK-UP, REPLACE X-101 CERAMIC OSC TV has HV with ear next to speaker. There is noise fromspeaker. But there is no brightness and using the power switch on frontof TV or remote hand unit the TV cannot be turned off, clock at Pin 1IC103 less than half the amplitude given on the circuit d
SonyKV2670RSYSTEM CONTROL LOCK-UP, PERFORM PROCEDURE FOR NO VIP TV has HV and with ear next to the speaker there is noisefrom the speaker. But there is no brightness and using the power switchon the front of TV or remote hand unit the TV can not be turned off.
SonyKV2670RDELAYED TUNING, JUNGLE IC-301 When switching channels, picture flickers and audio is mutedfor several seconds. AFT voltage at Pins 32, 33 of IC103 bounces untilpicture stabilizes. No horiz. sync pulse from Pin 3 of IC301.
SonyKV2670RPURITY OFF, REPAIRED DEGAUSING COIL Minor purity problem in the upper left corner. Hand degauss-ing did not clear problem and could not be adjusted out. The purity wasso far off that the red gun controlled the green phosphor.
SonyKV2670RINTERMITTENT SYNC, REPLACE L-506 Intermittent no sync and no color.
SonyKV2670RLOSS OF -33V RESULTING NO CHANNEL DEL/ADD, REPLACE L-105 Could not erase or add a channel. All channels had to besequenced thru in numerial order. Found no neg -24V or -10V on Pins 6and 7 of IC105 (memory) only when set was on. The -33V supply source waspresent when set was off.
SonyKV2670RVERTICAL JITTER ON CABLE, REPLACED TUNER AND ADJ T-201 Vertical jitter up to 1 inch when connected to cable orsatellite antenna. Off air signal OK. Two sets with the same problem.Dealer exchanged the set and problem presents on replacement unit. Whenunit is connected to cable jitter, it was reduced to 1/2
SonyKV2670RINTERMITTENT SND/PIX, RESOLDERING FREQ SYNTH PPU1 Very intermittently the picture would turn all snowy. Wefound the Frequency Synth. unit to be improperly seated and poorlysoldered.
SonyKV2670RINTERMITTENT AUDIO, SPEAKER LEAD COLD SOLDER Two units with intermittent audio caused by unsolderedspeaker leads.



Assistência TécnicaAs dicas apresentadas destinam-se a técnicos de eletrónica, a tentativa de reparação ou assistência sem ter conhecimentos de eletricidade e eletrónica, podem provocar danos mais graves aos equipamentos e, devido a tensões muito elevadas em alguns circuitos, graves danos fisicos que podem constituir um risco em determinadas reparações.

Não arrisque reparar equipamentos com tensões elevadas se não tiver conhecimentos técnicos para o fazer em segurança.

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