Dicas Reparação SONY
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| 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 |
| Sony | KV27V40 BA4 | all snow | KV27V40 Unit will not change channels. The number changes but the set will only display a all snow image. Tech replaced the tuner and it did not solve the symptom. | Tech needs to check the SDA And SCL lines to the tuner. When the set is on the Clock line at the tuner has a pulse but the SDA is Low. No data pulses. Unit had a scratched trace leading to the tuner assembly/ Jumpered trace and tuner now runs correctly. | Muller |
| Sony | KV32V40 BA4 | acoustal vibration | KV32V40 serial Unit has an acoustical vibration on certain frequencies. | Tech will need to go out with an variable audio tone generator to see where the source is of this mechanical vibration. Once found the tech must apply a special tape to the mating surfaces of the cabinet parts that are vibrating as stated in bulletin 244R1. This bulletin does not actually apply to this model but the approach to the repair is the same. Part # of the tape necessary for this job is 7-632-661-51 | Muller |
| Sony | KV27V66 BA4 | A.C. hum | Unit has a slight 60 Hz buzz in the speakers. When in the external input mode and no signal applied the hum is evident. | I asked tech to check to see if the upgrade listed in CSV #397. Jumper are present in the correct spots of the ""K"" board. Tech can measure 9.6 volts buzz at speaker terminals. However with the speakers disconnected the customer still claims to hear the 60 hz buzz. It this is true the tech needs to look into the deflection yoke for a cure the buzzing. By putting pressure on the yoke, the tech can try to eliminate the vibration in the yoke assembly caused by loose "" | Muller |
| Sony | KV13V50 BA3 | NO RASTER | Sony KV13V50. No raster. Has sound. Tech replaced CRT and Jungle chip without any positive results. | I had tech measure the Cathode of the CRT. All cathodes were at 368 volts. This voltage is about 180 volts too high. This voltage did not vary even when the CRT was disconnected. This indicated the 180 volts source at cathode of D512 180 v source was too high. If CRT were disconnected the voltage is still too high. Open bleeder | Muller |
| Sony | KP61XBR38 AP | RASTER | KP61XBR38. Unit has no raster but has PIP, Sound, and On Screen Display. This symptom shows up in the tuner and video input modes. | When checking the monitor output from the rear of the set the video is fine. Next we needed to measure the video in to the P4 board. This is the digital combfilter. Checking P432(6) we had good composite video. But there was no Luminance out at P4-32(3). All B+'s were normal on the post regulators on the board. Placing a 4.7 mfd capacitor between these points, luminance was restored. This test proved the combfilter was defective and the rest of the set was OK. It appears that IC201 on board may be defective. Video can be traced to IC201(25). Clock & BGP are present at IC201(11 & 17). Tech will need to replace the board if it is available. | Muller |
| Sony | KP53EX20 AP | WRONG COLOR | KPR53EX20 serial .8001436 unit has poor black and white tracking. Tech needs to know how to get into the internal adjustments to adjust drive to each CRT | There are no drive controls to any of the CRT. The only adjustment that can be made is G2 and focus. All other adjustments are automatic through he IK circuit. Suggest the tech look at each tube faceplate and inspect the phosphor for the normal registration burn. If the tubes are coffee color in the registration area It may just mean we have a set with a lot of hours on the CRT and they simply cannot produce enough light to achieve normal white balance tracking. According the tech the tubes were very dark in the | Muller |
| Sony | KP53XBR15 AP | system control | When the set is in the external video input mode and put back into the antenna mode the set will be on channel 167 with white noise on the screen. | This is an illegal channel entry and is not a function of CATV our the UHF channel number. Everything else works normally with the exception of this glitch. My suggestion is to try to initialize the EPROM and see if the symptom clears up. This action did not correct the symptom. EEPROM replacement solved the problem. | Muller |
| Sony | KPR46EX35 AP | SYSTEM CONTROL | KPR46EX35. Unit turns itself on or off at its own will. Customer explains that the TV will turn it self on in the middle of the night or it will turn itself off while watching the set. The power switch, IC001 in ""A"" board. "" | When measuring the Power Key input to the main Microprocessor, IC001(11) it was only 3.7 volts with no keys pressed. Even when connector A-8 was disconnected IC001(11) stayed at 3.7 volts. Also this voltage fluctuated in level from 3.5 to 3.7. When C038 was removed the voltage increased to 5.1 volts. Suggest the tech replace C038 a 0.01 mfd capacitor. With the new capacitor the voltage retained the 5.1 volts. C038 was leaky. | Muller |