| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV1910 | RETRACE LINES ON THE SCREEN | Vertical retrace lines were seen on the top of the picture onchannel 2 and 4. | ||
| Sony | KV1746R | INTERMITTENT SHUT OFF | Unit came in with complaint of goes off intmtly and blowsR232 fusible resisotr. Servicer changed Q205, Q206, C238, R212, R246.After all components changed unit went out again and in further investiga-tion, found R231 had 330 ohm instead of 10K as schema | ||
| Sony | KV1546R | BLOCHES IN PIX AND UNSTABLE, CHANGED VALUE OF R555 TO 82K | Screen has oval blotches with no info and will increase insize with signal received. Originally had 100kohm res. installed, aftercomparing with a KV-1547R with a 30P chassis we noticed it had an 82kohm. | ||
| Sony | KV1514 | BLACK BAR ON THE SCREEN | Black bar, about 3/4 inch wide on left side of screen. Blackbar would start bottom left corner and extend diagonally to top. Byhitting front of pix tube I was able to shift bar from left to right, incheach way. | ||
| Sony | KV1222R | DOORS DO NOT STAY CLOSED | The TABS on the front door that fit into the spring loadedlatch on the mask are not long enough nor are they notched. The doors donot stay closed but rather flop open. The tabs on units whose doors stayclosed are longer and are notched on the right han | ||
| Sony | KPR4600 | CONVERGENCE DISTORTION, REPLACED IC-5505 | Unable to correct severe keystone error of red and bluepattern. Red was more severe. Waveform at base of Q5510 and Q5517 wasdistorted, namely the right portion of vertical deflection was missing.This distortion was traced back to output of IC5505. | ||
| Sony | KP5040 | INTERMITTENT MECHANICAL OPERATION, REPLACED IC6502 N S953 | Intmt operation of the mirror assy which was not related tothe load on the motor/mechanism. The tubes were lubricated and movedfreely, mirror was removed. Actually the voltage to the motor droppedfrom normal 25V close to 0V and the motor would coast to | ||
| Sony | KP5040 | NO CHANNEL LOCK, INCORREC IC001 | This unit would not skip channels or operate on UHF onchannels 83, 84, 85. The tuner switched back to VHF-low operations.We found the incorrect uPC installed. It was uPD553C-056. | ||
| Sony | KP5020 | NOISE LINES ON THE SCREEN | This unit produced a drive line at the left side of thescreen on all three tubes. This was also radiated to any nearby sets.The problem appeared to be located on the board. However we found thedrive line to be caused by a noisy stopper diode - D5313. | ||
| Sony | KP5000 | NO CHANNEL LOCK, REPLACED Q2207, Q2208 | When programming the set, tuner would not stop on thechannels. We found a constant H (12V) at Pin 4 of IC2202 (Neon Drive).We traced the problem to a leaky Q2207/Q2208 sync detect/clamp circuit. | ||
| Sony | KX2501 | SHUTDOWN, REPLACED Q653 | Set would work for about 2 minutes and then Q652 would getvery hot and short out. Inspection revealed E to B open on Q653, pulseamplifier. | ||
| Sony | KX2501 | NO POWER, REPLACED C657 | Q652 shorts at turn on, extremely difficult to service thispower supply due to immediate failure at turn on. Used the followingprocedure to repair the set: Connect 22VDC to junction of R667 and R677.Also connect jumper from this point to 320V line. Co | ||
| Sony | KX2501 | SQUEEL, REPLACE POT | Customers are objecting to the 15,734kHz squeel. The noise ismost evident when the viewer is adjacent to or 45 off axis to the set, andduring the first 10 to 15 minutes of operation from a cold start. | ||
| Sony | KX2501 | DEAD, INTERMITTENT SOLDER CONNECTION TO EMITTER Q1501 | Found this unit to have a shorted horiz. output and converter(power supply). We traced the problem back to a loose connection on theemitter of the horiz. driver transistor. | ||
| Sony | KX1901 | NO BLUE ON RGB INPUT | No blue on RGB input. Writing from computer comes out yellow. |