Dicas Reparação
Modelo - Chassis KV27HFR
Pesquisa: KV27HFR Enviar Dica Resolvida
Resultados 26
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV27HFR | DEAD SET SHORTED DAMPER DIODE, Q501 | Customer reported dead set found D512 shorted, replaced D513also and Q551 and C550 as precaution. | ||
| Sony | KV27HFR | BARKHAUSEN OSCILLATION, RESOLDERED FBT CONNECTIONS | We received some reports of barkhausen oscillation which maybe intermittent in nature and sometimes signal strength dependent. Theproblem is caused by a poor ground connection on the focus block sectionof the flyback. | ||
| Sony | KV27HFR | INTERMITTENT SHUT DOWN, REPLACE IC-681 ON "G" BOARD | The unit would very intermittently shut down. The relay wouldopen in the failure mode indicating a problem with the OVP circuit. Theproblem was caused by an intermittent power module DM-36/IC-681 in theswitching supply. Replacement resolved the proble | ||
| Sony | KV27HFR | NO ON SCREEN DISPLAY, LEAKY D-121 | No on screen display. | ||
| Sony | KV27HFR | VERTICAL ROLLING OF PICTURE, REPLACE R-527 | Checked the signal of IC-301 pins 47 and 48 found the synclevel at pin 48 was rounded off. Checked surounding components and foundR-527 had increased in value. I also checked C-520. | ||
| Sony | KV27HFR | DEAD, REPLACE R-664 ON "G" BOARD | Resistor R-664 (base of Q-655) had increased in valueaffecting the bias of Q-655. As a result, unit did not start up. | ||
| Sony | KV27HFR | DEAD, SHORTED D-686 ON "G" BOARD | Dead - could not get 135V line past 40 volts. This unit isdifficult to troubleshoot due to incorrect voltages in some areas aroundIC-682, IC-651, etc. | ||
| Sony | KV27HFR | NO COLOR, REPLACE C-508 | Pin 12 of IC-301 was about 1 volt DC, waveform was ok. Thehorizontal pulse at this pin is also used for burst flag inside this IC.C-508, connected to pin 12 of IC-301 was leaky. | ||
| Sony | KV27HFR | SHUTDOWN, REPLACE R-505 | Shutdown due to excessive Hi voltage disconnected H-out andchecked horizontal waveform at pin 11 of IC-301. Frequency was 7 kHz.adjustment of FH control (RV-501) would bring into specs. Checkedresistance of RV-501 and R-505. R-505 read 1.5 Meg (should | ||
| Sony | KV27HFR | DEAD, REPLACE C-658 | 135VDC supply dead - no output at IC-651 and pin 12 was low.Tried supplying 3V to pin 12 with external supply. Noticed output at pin7 returned, but was in the MHZ range. | ||
| Sony | KV27HFR | NO SYNC, NO COLOR, APPEARANCE OF AGC BENDING, C-520 | Picture appeared to have sync-AGC trouble. Placed a videosignal to the video input, and displayed the same problem. Thiseliminates IF and tuner section. Checked video signal through and foundC-520 bad. This is the second set with C-520 bad. Closer l | ||
| Sony | KV27HFR | VERTICAL JITTER AND HORIZONTAL INSTABILITY, C-520 | Some inputs displayed vertical jitter horizontal bend/insta-bility and smear of bright areas of picture. Found C-520 to be leaky.Key is to look at sync inputs on pins 47 and 48 of IC-301. With strongsignal inputs the sunc tips are lower P-P value than | ||
| Sony | KV27HFR | NO RASTER, C-574 OPEN | No raster - sleep light on and audio is muted. Turning upscreens raster showed retrace and foldover at top of screen. Sprayingvertical section raster would return but retrace still visible and fold-over still present. | ||
| Sony | KV27HFR | INTERMITTENT VERTICAL | These units displayed intermittent vertical roll. Traced toIC-302 pin 4 and CU-301 video signal was low 1.9p.p - replaced C-520.I had two units with the same problem. | ||
| Sony | KV27HFR | NO POWER ON VIA REMOTE CONTROL; POWER OFF IS OK, OPEN FOIL | Once set manually powered on, all other remote and manualfunctions ok. Remote control works ok on another set. |