Dicas Reparação SONY
Modelo - Chassis
Pesquisa: SONY Enviar Dica Resolvida
Resultados 18945
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | KV32V20 AA-2 | VIDEO | KV32V20. Unit has poor contrast. Tech has to raise the G2 just to get a raster. When the raster appears the picture is washed out and lacking good contrast ratio. | Gaining a little more information from the tech I found out the set actually had a ""No Raster"" condition, and the timer led was flashing. The G2 was increased tin order to get this washed out picture. The probable cause of this problem is the IK pulses may be too low for the Jungle IC to correctly interpret them. By raising the G2 voltage the IK pulses are raised up to a point where the Jungle will acknowledge them. But by then the RGB drive is too great and a overdrive condition occurs on the CRT. Tech needs to check the components in the ""IK buffer circuit on the ""C: board D1792= 3.9 volt zener diode, & Q1790=2SA1309A "" | Muller |
| Sony | KV36FV1 AA-2 | VERTICAL SWEEP | KV36FV1 Unit has insufficient vertical sweep and vertical foldover at the bottom of the screen. | Suggest the tech try to replace the Charge pump diode and pump up capacitor D561 & C565. This did not correct the symptom. But it was found while moving the wires around the yoke connector the symptom changed slightly. But when tugging on the wiring going into the deflection yoke the tech found a significant change in the vertical deflection scan. There isn't a schematic for the yoke assembly but a small connector inside the yoke housing where the 3 controls were mounted. The connector is called P16.It was not soldered very well. It had thin solder across the land to the pin but what looks like pin oxidation it from making a good electrical connection. Resoldering the connection returned the set to | Muller |
| Sony | KV35V35 AA-2 | vertical sweep | KV35V35. Unit has not vertical sweep and no sound. | No vertical drive from Jungle chip. Data and clock normal. Jungle chip has been replace several times with no effect. EPROM was changed too with no effect. But the CPU IC001 repaired problem. | Muller |
| Sony | KV32S45 AA-2 | vertical lines | KV32S45. Serial # 8047063. Unit has a thin vertical lines in picture that are spaced 1 inch apart on the left side of the screen. It can be scene on all inputs. Best seen on scenes around 10 ~ 20 IRE. | The description sounds like jail bars caused by a ringing in the B+ to the Flyback transformer. It is suggested to install a capacitor with a value of 33 mfd at 250 vdc in place on top of chassis in positive side to FB503 and negative side to ground. This simply increases the capacitance on the 130 volt line to the horizontal output section, and reduce ripple caused by the hard demand of current when the flyback is switched on. Part # 1-107-654-11. This minimized the effect | Muller |
| Sony | KV32XBR48 AA-2 | VERTICAL | KV32XBR48 this is a AA2C chassis. The television has no vertical sweep, and no sound. Tech replaced the vertical output IC without correcting the symptom | Tech is trying to cure the vertical sweep defect but the not the sound. These are related to each other. This set will not develop vertical sweep unless there is data communications between the microprocessor and Jungle IC. Tech needs to monitor the SDA & SCL lines that are marked on this chassis. If there is a short on either line the set will loose vertical sweep. Clue is you need the SCL & SDA lines to control audio, if a short is on these lines or data is corrupt the set will have no audio too. There was no Data or clock on the UX board. Checking the presence of 9 volts we found it to be only 7 volts. Monitoring the protect diode D261 zener diode on the SDA line. Unit had a defective D261 on the UX | Muller |
| Sony | KV32S25 AA-2 | uneven brightness | KV32S25. Unit has Bright glow at top of screen. Unit had 8 volts at pin 5 of vertical output chip. It is supposed to be ""0"" volts. Also unit has no audio. "" | Both 2 and 4 of IC1501 are +12v and -15v.. Appears to have the wrong inputs to the vertical output chip. Data line shorted to ground. The clock line sitting at 5 volts with no clock signal. Removal of the PIP module restores the normal operation/ Unit has defective PIP module. | Muller |
| Sony | KV32S22 AA-2 | uneven brightness | KV32S22. Unit was dead. Has a glow at the top of the screen only when the G2 voltage is increased. | Unit is missing the -15 volt source voltage to the vertical output | Muller |
| Sony | KV32S20 AA-2 | uneven brightness | This product has a strange glow toward the top of the tube. Sort of an out of focus raster but only at the top 1/5 of the tube. | When raising the G2 voltage it was discovered the CRT had a uniform brightness where the top of the screen was brighter than the rest in the CRT. Measuring across the vertical yoke windings we found a8.5 volts. It should be ""0"" volts if the vertical output is working. It was also discovered the -15 was missing. Tech needs to look at D530 and R537 a 0.47 ohm resistor. Unit had bad diode, resistor and vertical output "" | Muller |
| Sony | KV35V68 AA-2 | TV Guide Plus | TV guide plus does not function. When the television is setup for TV guide Plus the customer is selecting that they have a VCR and CATV box. But they are not using the Cable Mouse or IR Blaster. | The IR blaster is used to communicate from the television to the CATV box in order for downloading to occur. If the IR blaster is not used the feature will remain inoperable because when the set downloads the data, it must find the host channel. It uses the IR blaster to change channels on the CATV box in order to find the host channel. In order for this to operate the customer must use the IR Blaster. If not they will need to split the cable before it gets to the CATV box and deselect any VCR or CATV box questions by answering ""N0"" to questions about them in the initial setup menu. "" | Muller |
| Sony | KV35V68 AA-2 | TV Guide Plus | KV35V68 Serial 9005526 TV guide plus does not function. When the television is setup for TV guide Plus the customer is selecting that they have a VCR and CATV box. But they are not using the Calble Mouse or IR Blaster. | The IR blaster is used to communicate from the television to the CATV box in order for downloading to occur. If the IR blaster is not used the feature will remain inoperable because when the set downloads the data, it must find the host channel. It uses the IR blaster to change channels on the CATV box in order to find the host channel. In order for this to operate the customer must use the IR Blaster. If not they will need to split the cable before it gets to the CATV box and deselect any VCR or CATV box questions by answering ""N0"" to questions about them in the initial setup menu. "" | Muller |
| Sony | KV36FS10 AA-2 | System control | Unit will turn on but not have any raster until the channel is selected. The LED in front flashes indefinitely until the channel is selected. After a channel is selected the set will run fine the rest of the day. The unit has high voltage, filaments, & vertical sweep during the no raster condition. | After first turning on the set the cathodes of the CRT are measured with an oscilloscope. An interesting fact that after the set is turned on there are no visible IK pulses on any of the CRT cathodes. IK pulses only appear when the channel is addressed with the remote or the Channel up down command on the television. Initialization of the EEPROM did not correct the symptom. No incorrect values found in the alignment parameters. Only by elimination was the trouble found to be in the EEPROM. | Muller |
| Sony | KV27V25 AA-2 | system control | Unit has intermittent snow in the picture. 8-598340-20 tuner was replaced. Now the set has a symptom where the remote control causes the set to enter the video input mode when the channel is selected. Also the set will enter the video input mode if another brand of remote that operates a stereo receiver is used. | I instructed the tech to enter the tech mode and set the ID codes...ID0=25, ID1=23, ID2=47, ID3=0, ID4=27,ID5=135, ID6=1, ID7=0 . Write these in memory, then press ""8"" ""Enter"" to initialize. "" | Muller |
| Sony | KV27V22 AA-2 | SYSTEM CONTROL | KV27V25 Unit has intermittent snow in the picture zThe tuner pn# 8-598-340-20 was replaced. Now the set has a symptom where the remote control causes the set to enter the video input mode when the channel is selected. Also the set will enter the video input mode if the and another brand of remote that operates a stereo receiver will put the set into the video input mode. | I instructed the tech to enter the tech mode and set the ID codes...ID0=25, ID1=23, ID2=47, ID3=0, ID4=27,ID5=135, ID6=1, ID7=0 . Write these in memory, then press ""8"" ""Enter"" to initialize. This corrected the problem. "" | Muller |
| Sony | KV27FV15 AA-2 | SYSTEM CONTROL | KV27F15 The set has a symptom of the keyboard doing the wrong functions. Cannot get into the tech menu. When the display button is pushed the set will shut off. | Checking Key-in to the I001 we found it to be sitting at 3.7 volts without any keys pushed. This is an analogue input to the CPU and must be at 5 volts with no keys pushed. Keyboard had small board contamination on the channel down switch. Removing the channel down switch corrected the problem. All remote control functions return to normal and so did the keyboard functions | Muller |
| Sony | KV27S40 AA-2 | squeal | KV35S40Unit is making a noise internal to the television that resembles the sound a fax machine makes when listening to it over a telephone connections | These sounds are apparently caused by loose laminations in the Linearity transformer. It is suggested the tech replace L511=1-406-607-41, C520= 1-101-821-00(.002 mfd @ 500 vdc) R506 =1-215-861-00(47 ohm@ 1 watt Metal film) | Muller |