Dicas Reparação SONY
Modelo - Chassis
Pesquisa: SONY Enviar Dica Resolvida
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV27V42 BA4 | OSD | KV27V42 When playing the DVD player through the S-video input the Letters ""DVD"" show on the screen. "" | I asked the tech to enter the tech menu and change the setting in the VSS parameter from ""0"" to ""1"" Also change CDMD from ""0"" to ""3"" . This relates to the bulletin TV420. However this did not correct the symptom. I had the tech scrutinize the picture very closely and he discovered the image begins to have a slight sync stability prior to the event where the set displays the words ""DVD"". I had the tech interrogate the composite video out of the DVD player and look for any anomalies in the composite video, vertical blanking interval, and horizontal sync. This unit uses sync to determine if the input port is live with valid sync. If sync is missing or corrupt the OSD will show the words that are defined by how the input label programmed. This unit may "" | Muller |
| Sony | KV27S42 BA4 | NO RASTER | KV27S42 Unit has a flashing picture on channel 2. The raster will increase to a point where the raster will disappear with the Front panel LED flashing 5 times indicating an AKB failure. | Tech need to enter the tech menu and reset the VSS parameter from 0 to 1 and the CDMD from 0 to 3. Channel 2 is broadcasting a signal in the VBI area of the video signal. | Muller |
| Sony | KV27S40 BA4 | No Raster | Sony KV27S40 serial 8070786 No raster. Has OSD and Sound. Timer LED not flashing. Tracing the video signal found that it was getting to the comb filter but no chroma or luminance output. | Pin 27 of the combfilter did not have and 3.58 MHz signal on it. Looking in the Tech menu of the chassis found the parameter #51 fsc was set to ""0"" We set it to ""1"" and restored the chroma and luminance. "" | Muller |
| Sony | KV24FV10 BA4 | NO HIGH VOLTAGE | KV24FV10 unit will not turn on. No High voltage. LED in front blinks 4 times indicating there is a vertical deflection has stopped. Both relays will latch but RY600 will unlatch after 15 seconds | RY600 is the degaussing relay. The 15 second delay is normal. Since the unit never develops high voltage it would be obvious to all that vertical deflection will not occur. However the flashing of the LED ""4"" times is a bit misleading. The turn-on relay (RY602) latches but we are not able to achieve secondary B+. Closer inspection discovers that we are not getting primary voltages either. Jumping the relay (RY602) achieves High voltage and all functions work normally. Unit has a defective RY602. part # 1-755-266-11 "" | Muller |
| Sony | KV27S45 BA4 | NO HIGH VOLTAGE | KV27S45 serial 8015302 Unit will turn on but will have high voltage. It will shut down with the LED in front flashing 5 times indicating there is no vertical sweep. Jumping RY602 I was able to keep the set on and test the power supply and IC451 integrity. | Checking all the ""MUST HAVES"" I found that all B+'s were normal on the vertiical output IC. But checking the Data and clock I found that the pulses, after the power is pressed the data and clock pulsed 3 time during a the 3 second period wait affter power button was pushed. After the 3 seconds there was a were a series of pulses with a duration of only 120 microseconds wide remaining for 3 more seconds then disappeared. The pulses were 5 volt peak to peak and looked OK. Artificially I was able to ""tickle"" IC451(1 & 7) with my Fluke 77 meter in the diode check mode. This tests the ability of the IC to deflect the beam up or down to check the intergrity of IC451. I was able to get the beam to move up and down with this test. We had the same type of Data and clock going to all peripherials. I unplugged the ""P"" board and started the set again. The Data and Clock now changed dramatically. Instead of a 120 Microsecond pulse train, it increased to was 1000 microseconds. Unit has defective ""P"" "" | Muller |
| Sony | KV27FV15 BA4 | INT RASTER | KV27FV15 Unit has Unit has a symptom when it is on Channel 4 (KNBC Los Angeles) the set will display a normal picture then get brighter and brighter then go to a no raster symptom with sound. | Tech needs to enter the tech menu mode and change the values of CDMD to 1 and VSS to 3. | Muller |
| Sony | KV27V40 BA4 | Dead | Unit is dead. Only the Timer LED flashes. | There are apparently no shorts circuits on the secondary of the main switcher supply. However when trying to discover why the IC601 was shorted we could not find any evidence of line surges that might have shorted the VDR601 or open R618. But when checking the secondary of the Flyback transformer at the outputs of D560 and D561 we found nearly 4.6 ohms from the +13 to the -13 volt source. Floating IC541(2&4) removed the shorted condition. Unit has a shorted vertical output IC541 shorted from the +13 volt to the | Muller |
| Sony | KV27S45 BA4 | Dead | KV27S45 VDR5050 Unit dead. Inspection of the chassis discovered there is no stand by voltage. Inspecting the ""E"" board found that the fuse F5050 was open and the VDR5050 had a chunk of material blown off of it. "" | VDR5050 is metal oxide varistor. It is in parallel with the AC line voltage . It appears the customer had a AC line source that blew the MOV, then the fuse. Checking Q5001 we do not find a short between Drain and Source. Suggest the tech remove the MOV and replace the fuse and try operating the set. It operates fine. Suggest the tech replace the MOV, but disable the television until the MOV can be replaced, since the MOV is a Protection device in the event the Power surge returns. NOTE: It was discovered the VCR was also dead which not was not evident at the time of the call. This confirms the power surge theory. VDR5050 = 1-801-074-41 F5050 =1-576-193-11 6.3 amp @ 125vac. | Muller |
| Sony | KV27S40 BA4 | Dead | KV27S40 Unit is dead. Will not turn on LED flashed 5 time . The set will latch the relay but will not develop secondary voltages from the main power supply | Checking the secondaries of T603 we could not find any short circuits on the se The needs to connect a variac up to the television and supply 18 volt AC. A jumper need to be installed across the contact connections of RY602 in the A"" "" | Muller |
| Sony | KV27V40 BA4 | dead | KV27V40 8112963 Unit is dead. Only the Timer LED flashes. | There are apparently no shorts circuits on the secondary of the main switcher supply. However when trying to discover why the IC601 was shorted we could not find any evidence of line surges that might have shorted the VDR601 or open R618. But when checking the secondary of the Flyback transformer at the outputs of D560 and D561 we found nearly 4.6 ohms from the +13 to the -13 volt source. Floating IC541(2&4) removed the shorted condition. Unit has a shorted vertical output IC541 shorted from the +13 volt to the | Muller |
| Sony | KV27V40 BA4 | CONVERGENCE | KV27V40 Unit has vertically skewed convergence. Center vertical convergence is Skewed with red skewed counter clockwise by 0.5 inches and blue skewed clockwise by nearly the .05 inched. Green lines are straight. | Problem is caused by a defective CRT. | Muller |
| Sony | KV27V66 BA4 | clock | KV27V66 serial Unit looses 3 minutes a in 2 weeks on the internal clock in the television | The clock should remain within 7 seconds + or minus in a seven day period. The time base is from a crystal and the count down circuit inside the microprocessor. Suggest the tech replace the crystal, and the two padding capacitors in the crystal network. | Muller |
| Sony | KV27S42 BA4 | AUTOPROGRAM | KV27S42. Serial 411756 Unit does not autoprogram. When using direct access to change channels the set will execute channel change but takes nearly 4 seconds before it will lock in. channel the set will access it | All TV's that use autoprogramming must have 2 inputs to the CPU that will tell the CPU it will store a channel in its memory. These inputs are AFC crossover voltage & presence of horizontal sync. The AFC get the frequency of the video carrier centered in the passband of the IF. The horizontal sync is used to validate the signal is a non-scrambled video signal. This television did not have the Horizontal sync from IC010, an HSYNC-SW. This device is used to detect valid horizontal sync from both tuners. There was composite video at IC010(1) but there was no output on IC010(7). Neither one of the tuners had good channel lock in characteristics. Suggest the tech check out IC010. IC)10 had a contaminate under the chip. It was a light brown compound that covered all pins under the IC. The contaminate was removed and the old Chip reinstalled and the set operated | Muller |
| Sony | KV27V65 BA4 | audio | KV27V65. Unit has a 60 hz buzz in the audio will near minimum level is selected | Tech needs to add a ground wire to the ground side of R544 to the ground under the flyback transformer | Muller |
| Sony | KV27V40 BA4 | audio | KV27V40 8024539 Unit goes looses audio on voice peaks or when ever the volume is moved to a high position the volume will mute for about 1 second | When Isolating the mute transistors I find that removing the Coupling capacitor C223 stops the muting action. This capacitor appears to be monitoring the B+ used for the audio output IC. We do have a slight fluctuation of voltage 0.3 ~ 0.5 volts to the audio output when the volume is maximized out. this is coincident to load variations of loud to soft sounds However when this variations reach the 0.5 volt deviation the audio will mute. R210 is good and so is Q204. We replaced C223 with a new one and even tried to reduce the value to 1 mfd but we still get the same muting effect on voice peaks. IC401 has been replaced on an earlier visit with no changes in the symptom. It is unknown why this is causing this | Muller |