Sony Repair Tips

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Make	Model	Symptom	Problem	Solution	By
SONY	KV27V42 BA4	Shut down	Kv27v42. unit had led in front flashing 4 times after turn on. this indicates the unit has no vertical deflection.	The vertical out is shorted and burns out the -15 volt supply. the resistor r561 is a 1/4 watt and r562 is a 1/2 watt. these resistors typically are both the same wattage. it is suggested to replace both with the same value. 0.47Ω @	Muller
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 replace the setting in the vss parameter from ""0"" to ""1"" also replace 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 wsound 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 wsound 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 tsound 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 tsound 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 tsound 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 replaced 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 replace the values of cdmd to 1 and vss to 3.	Muller
SONY	KV27V40 BA4	Dead	Unit is dead. only the timer led flashes.	Tsound 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 4.6Ω from the +13 to the -13 volt power supply. 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 tsound 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 power supply that blew the mov, then the fuse. checking q5001 we do not find a short between drain and power supply. 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.	Tsound 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 4.6Ω from the +13 to the -13 volt power supply. 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. tsound was composite video at ic010(1) but tsound 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 loses 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 replaces 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 wsound the power supply 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 power supply at cathode of d512 180 v power supply was too high. if crt were disconnected the voltage is still too high. open bleeder	Muller

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