Dicas Reparação

Modelo - Chassis

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Resultados 79454
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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.
KEYSTONE, REPLACED D5313, D5312, Q5537 Keystone effect on all three tubes. Pix normal at top butnarrow at bottom.
H PICTURE DISTORTION Horizontal frequency changes after short warm-up.
NO PICTURE Q502 runs red hot for about one week and then fails, causingno raster.
V FOLDOVER ON THE BOTTOM Severe foldover on bottom.
GRAY BAR ON THE SCREEN Gray bar very dark on left side and becoming lighter lookingtoward right side of CRT.
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.
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.
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.
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
SHUT DOWN, REPLACE IC601 Set turns off by itself after 45 minutes.
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.
INTERMITTENT SOUND, REPLACED IC202 Unit had very intermittent sound.
SOUND POP NOISE, REPLACED C226 Sound would pop off and on intermittently.
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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