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Sony Repair Tips




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Search: sony
Results: 20100
Make Model Symptom Problem Solution By
SONY KV32V25
AA-2 		Retrace lines Kv32v25 serial 7019547. unit has bright screen with retrace lines then shuts down. Measuring the 200 volt b+ at the crt socket we found the voltage to be under 126 vdc. this indicated the 200 volt power supply was not running. i had the tech check r553 a .47Ω 1/2 watt resistor and it was open. replaced the resistor and the set operated normally Muller
SONY KV32S26
AA-2 		Retrace lines Kv32s26. unit has bright screen with retrace lines Unit has the 200 vdc cathode power supply voltage measures 179 vdc but when measuring on the cathode directly the voltage is very low 22 vdc. disconnecting the socket causes the voltage to rise back to 198 vdc. unit has a defective crt. Muller
SONY KV32S26
AA-2 		Retrace lines Kv32s26 unit will go to as bright screen with retrace lines then shut down. When the set shuts down. all cathodes of the crt are only 66 volts. with the crt disconnected from the module the rk, bk,& gk will increase to 202 vdc. . unit will need a replacement crt Muller
SONY KV32S22
AA-2 		Retrace lines Kv32s22 serial 8046606 blue screen with retrace lines then shuts down. Monitoring the ""c"" board blue cathode terminal the tech found the voltage was less than 70 volts when connected to the crt. removing the module from the crt the voltage raises the voltage to 189 vdc at kb. crt... unit will need a replacement crt "" Muller
SONY KV32S22
AA-2 		Retrace lines Kv32s22 serial 8011789. unit has intense blue raster with retrace lines then shuts down. tapping on neck of tube aggravates the symptom Tech will need to replace the crt. 8-733-741-05 Muller
SONY KV32S22
AA-2 		Retrace lines Kv32s22 serial # unit has bright screen with retrace lines then it will shut down. Disconnecting the crt and measuring the rk, bk,& gk on the crt socket we found all of them running at 187 vdc. but after connecting the socket again to the crt they immediately dropped to 33 volts. unit will need a Muller
SONY KV32S26
AA-2 		Retrace Unit has bright screen with retrace lines. the flyback was changed but did not correct the symptom. Unit has the 200 vdc cathode power supply voltage measures 179 vdc but when measuring on the cathode directly the voltage is very low 22 vdc. disconnecting the socket causes the voltage to rise back to 198 vdc. unit has a defective crt. Muller
SONY KV32V25
AA-2 		Retrace Unit has bright screen with retrace lines then shuts down. Measuring the 200 volt b+ at the crt socket we found the voltage to be under 126 vdc. this indicated the 200 volt power supply was not running. i had the tech check r553 a .47Ω 1/2 watt resistor and it was open. replaced the resistor and the set operated normally Muller
SONY KV32S22
AA-2 		Retrace Unit has bright screen with retrace lines then it will shut down. measuring the g2 supply finds nearly 420 vdc but the crt cathodes are running only 55 volts. disconnecting the crt socket causes the cathode power supply voltage to rise over 180 volts. It appears the crt is loading down the cathode voltages. unit will need a replacement crt. Muller
SONY KV27S22
AA-2 		Retrace Unit goes to a bright blue screen with retrace lines then shuts down. Unit has a defective crt. when unit is able to turn back on again the set will sometimes be in the video input mode. Muller
SONY KV32V25
AA-2 		Raster Unit had an arcing inside the flyback transformer. the tech replaced the transformer now the unit has a bright band at the top of the screen. the tech replaced the jungle ic without affecting the symptom Tech noticed the +15 volt power supply was lower than expected. it was only 10 volts. it is not unusual. the voltage is normally 12 volts. what the tech missed is the -15. this voltage must be tsound in order for the set to have any vertical sweep. resistor for the -15 volt power supply from the flyback was open. d530 and r537 a 0.47Ω resistor. Muller
SONY KV32S20
AA-2 		Raster When turned on the raster has a dim glow, with the top brighter than the bottom. the timer led in front flashes. unit has high voltage and sound. When raising the g2 voltage it was discovered the crt had a uniform brightness wsound the top of the screen was brighter than the rest in the crt. it was also discovered the -15 was missing. tech needs to look at d530 and r537 a 0.47Ω resistor. Muller
SONY KV27V22
AA-2 		Raster Kv27v22 serial # 8049735 unit has red screen with then no raster g2 voltage drops to 3 volts. tapping on neck of tube causes the picture to return to normal. tech could not duplicate the trouble again. after this the set ran fine. Crt.. due to this symptom and the intermittent nature of the trouble i suggest that we replace the crt a68kzj50x Muller
SONY KV36V15
AA-2 		Purity Kv36fv15 serial # 9026985 unit has in the lower left corner the tube has a sever convergence and purity error. No magnets appear to have moved into a position that would this effect. it cannot be adjusted out. it has been determined the crt needs replacement. Muller
SONY KV27S45
AA-2 		Purity Kv27s45 serial 8056889 unit has sever purity error in the lower right hand corner of the picture The ""q"" distance has been severely compromised because the aperture grill has shifted. unit will need a replacement crt "" Muller
SONY KV27S22
AA-2 		Purity Kv27s22 serial 8091271. after the unit is turned on and the picture is on tsound is evidence the degausser is still running for about 5 seconds after the picture comes on. tsound seems to be a 18 second delay before the degaussing relay unlatches. tsound is only a 10 second delay for the picture to appear after power up. I don?t know what the latch time is for the degauser relay. i thought that it was a bit excessive. but even though the latch time is excessive the posistor thp601 should increase high enough in resistance to drop the degaussed current to minimum levels. the trouble was corrected by replacing the thp601 Muller
SONY KV35S40
AA-2 		Overglow Kv35s40 unit has preglow at the instant the television is turned on. ?the preglow shows in the lower left and right hand corner and stays until the raster appears. This phenomena is normal and is caused by the ik pulses that are produced at the instant of turn on. even thought the cathodes are not completely warmed up tsound will be a slight amount of beam current produced by just the ik pulses. since these pulses are at the top portion of the tube or on the curved funnel portion of the crt this symptom is common and is not considered a defect in the crt. Muller
SONY KV32S40
AA-2 		Power supply chirp Kv32s40 8096389 customer complaint is when the set is turned off tsound is a slight noise "" zip"" noise from the flyback transformer that lasts for about 2/10 of a second. the customer replaced the first sony for this trouble. but the symptom was also in this tv too. the customer tried two of the same models, and claimed they did not sound this noise when they heard it at the store. "" This noise is normal due to the fact the set does not shut off the main b+ from the main smps. what is turned off is the 9 volt power supply from ic642 in the ""g"" board. as the voltage decays the tsound may be a slight phase shift in the horizontal drive signal as soon as the 9 volts begins to drop. the reason the customer could not hear this symptom in a store is due to its acoustics. the store is far noisier and carpeted walls and floors. in the customers home the set sits in an enclosed oak cabinet (no doors) in a bedroom with tile floors. one can sound a pin drop in this room. this set is operating "" Muller
SONY KV35V36
AA-2 		Pip Kv35v36 unit has no control over pip channels. the pip only displays the main channel. it will not change on its own I asked the tech go through the id codes for this unit and see if they were the correct value. id3was 10 id5 was143 & id6was 0. these were wrong. the id codes are supposed to be from id0 ~ id7 = 25, 55, 47, 10, 155, 6, 0. after resetting the id codes the set operated the pip correctly but still needed to set the pip chroma phase Muller
SONY KV32XBR50
AA-2 		Pincushion Kv32xbr60 unit has narrow picture and hourglass distortion Q505 shorted and r571 open Muller