Dicas Reparação




Modelo - Chassis


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MarcaModelo
(Chassis)
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SonyKV1512
DEAD This unit initially appeared to have a shorted SG613 and2SC867. Upon powering up the set with a DC supply it was noticed thatthe waveforms were irregular. Closer examination revealed R522 hadchanged in value.
SonyKP7220
KEYSTONE, REPLACED D5313, D5312, Q5537 Keystone effect on all three tubes. Pix normal at top butnarrow at bottom.
SonyTV790
H PICTURE DISTORTION Horizontal frequency changes after short warm-up.
SonyTV123
NO PICTURE Q502 runs red hot for about one week and then fails, causingno raster.
SonyKX1901
V FOLDOVER ON THE BOTTOM Severe foldover on bottom.
SonyKV2648R
GRAY BAR ON THE SCREEN Gray bar very dark on left side and becoming lighter lookingtoward right side of CRT.
SonyKV2647R
JAILBARS, POOR GROUND ON "S" BOARD Jailbars present on left side of screen more pronounced onthe higher channels. Found poor ground on S board opposite the groundingposts from the tuner.
SonyKV2647R
NO VERTICAL SWEEP, REPLACE RV2206 No vertical sweep. Voltage at IC501 Pin 11 should be 6.3 VDC.Actual reading was 2.2 VDC. Found vertical hold control had an 8000 ohmreading center tap to case at all times.
SonyKV2643R
VERTICAL LINE ON THE PICTURE, REMOUNT Q701 Vertical line appears in the center of screen on brightscenes. Found Q701 installed wrong at factory. C was connected to E.B was connected to C and E was connected to B.
SonyKV2602
PICTURE BLANKING, ADJ JERROLD CABLE BOX, VARI-LOSER When using models with 30P chassis on cable systems thatscramble the pay channels (by removing the sync pulses at the head end andreinserting them thru a converter) the sync is sometimes compressed tooclose to blanking. This apparently reacts with the k
SonyKV1946R
SHUT DOWN, REPLACE IC601 Set turns off by itself after 45 minutes.
SonyKV1946R
SOUND AND PICTURE DISTORTION, REPLACE Q051 Set would not go all the way off. When turned off, pix woulddim, sound goes off. Found Q051 relay drive transistor completelyBURNED OUT.
SonyKV1945RS
INTERMITTENT SOUND, REPLACED IC202 Unit had very intermittent sound.
SonyKV1945R
SOUND POP NOISE, REPLACED C226 Sound would pop off and on intermittently.
SonyKV1922
NO LOW VHF No low band VHF-UHF OK. VHF high OK. No negative 6 volts atVHF HI terminal of tuner apply external -6 volts could tune in low band.Q102 VHF HI drive had no negative voltage at base troubleshooting found-12V rectifier being loaded.


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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