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Sony Repair Tips




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Search: sony
Results: 20072
Make Model Symptom Problem Solution By
SONY KV27S20
AA-2 		No raster Kv27s20. unit has no raster. tech had replaced crt but the symptom was not corrected power light still flashing indicating the unit is in the stand by mode Open trace on the crt driver board causing the ik pulses not to be returned to cn1761(6) not to be fed back into the jungle chip. Muller
SONY KV26V36
AA-2 		No raster Kv26v36 unit has no raster. further checking we found the set had high voltage and vertical sweep. just no filaments. I had tech check the must haves. the only thing that was not present was heater voltage. i had the tech remove the socket and measure the total resistance of the filament power supply by measuring the h1 & h2 terminal pins on the ""c"" board. it was open. h1 & h2 at the flyback were less than 1Ω. checking cn503 found the black wire was loose and fell out of the connector when unplugged from the main board. connector wire would stay in place if reseated. pushing connector back in place corrected the trouble. "" Muller
SONY KV32V25
AA-2 		No highvoltage Kv32v25 serial # 7014651. unit has no high voltage. The horizontal driver has tremendous amount of ringing on it. does not replace if we remove horizontal output transistor. the transistor has drive has 7 distinct pulses on the base that go above and below the cut off point of the transistor. these seven pulses are 1 microsecond in duration and are grouped in clusters after wsound the horizontal drive pulses are supposed to be. if allowed to operate for more than a minute the horizontal driver transistor q502 will short c to e. the product has a bad jungle ic301 Muller
SONY KV32S25
AA-2 		No highvoltage Kv32s25 unit will not develop high voltage. when the set is turned on no high voltage appears. the set has sound and has a flashing light on the front indicating the set is still in a stand by mode waiting for ik pulse feed back acknowledgement from the jungle ic When monitoring the horizontal output collector we found the 140 dropped slightly at turn on. but the horizontal driver q501(c) dropped to 85 and back up to 140. i had the tech to remove the horizontal output transistor and try starting up the set again. after power up measure the q501(c) horizontal driver transistor. it should be about 85 volts and stayed. this told us we were looking at a shutdown symptom. checking all secondaries we found nothing shorted. replaced flyback which corrected trouble. Muller
SONY KV27S25
AA-2 		No high voltage Kv27s25 serial 811908. unit has no high voltage. led in front is flashing on and off after power up. tsound does not seem to be any horizontal drive to the horizontal drive transistor. defeating the horizontal output by removing the collector connection still will not allow horizontal drive to appear at ic351(37). this pin is sitting at nearly 8.5 volts, not the 3 volts it is supposed to be. also ic351(38) the hoff/afcpin is at 3.3 volts which is normal Looks like the tech has a bad ic351 cxa2025as. a second jungle ic corrected the problem. Muller
SONY KV32XBR48
AA-2 		No chroma pip Sony kv32xbr48. no chroma in pip X3304 0n px board not soldered (pip) Muller
SONY KV27S15
AA-2 		No chroma Kv27s15 unit has no chroma. black & white is ok. also no chorma while using the pip. sound and on screen display ok. initializing eprom does not change the effect. Scoping the first place wsound the chroma signal can be readily available is on the pip module. they are marked ""c in"" & ""c out"" on connector cn501(1 & 5). we have chroma going into the pip board but nothing coming out. jumping these pins together with a 1 mfd capacitor caused the color to return, as long as the capacitor was in place. unit has bad "" Muller
SONY KV36FV75
AA-2 		No audio Kv36fv75. unit has no audio. but also has no osd stating ""main"" or ""stereo"" main picture is fine. "" Id codes are 0=25, 1=55, 2=47 3= 0 , 4= 155, 5 =143, 6 =6, 7=0 which is correct. initializing the eepom did not correct the trouble. tech will be returning with a manual Muller
SONY KV27V22
AA-2 		Intermittent snow Kv27v25 unit has intermittent snow in the picture zthe tuner pn# 8-598-340-20 was replaced. now the set has a symptom wsound 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 KV32S26
AA-2 		Int raster Kv32s26 unit has a brighter than normal picture. when g2 is lowered the picture blinks on an off. tech replaced the flyback and jungle chip with no changes in symptom I had tech short the cn1761(1, 2, 3, & 6) together. this should give a perfect black and white picture. but when this was shorted we had a black and white picture but the picture still was flashing. since the jungle ic was already replaced it was assumed the ik pulses were ok from the jungle chip. the main concern is if the pulses are leaving the main board, and if the pulses are getting back to pin 27. this flashing condition indicates the ik feedback pulses are insμFficient some wsound in this path. further static check indicated a shorted zener diode d1792 in the ik bμFfer path on the crt Muller
SONY KV35V75
AA-2 		Horizontal sweep Unit has shorted l511 and q512. tech replaced these items and they burn out again Tech needs to replace d503,d502, d504 and c511, c512 the retrace capacitor along wit the other components. Muller
SONY KV36FV1
AA-2 		Horizontal sweep Kv36fv1 serial 9023663 unit has a sever over scan condition for horizontal sweep. tech did not measure any voltages in the pin amp circuit Tech needs to check on l511, q512, c513, c511, d502 & d504. one or more of these are shorted. Muller
SONY KV35V35
AA-2 		Horizontal sweep Kv35v36 product has a insufficient horizontal sweep. the sweep is reduced by 10 to 15% on the left side and 2 ~ 5% on the right. When going into the tech set up parameters and adjusting the hsiz value the sweep will replace to full sweep. monitoring the voltage at the collector of @q512 the voltage will vary from 27 volts hsiz set to 22. when hsiz is set to 48 q512(c) will drop to 16 volts. the set will have full sweep but it has a slight foldover condition on the right side of picture. it is recommended the tech replace the retrace capacitors c511, & c513 and the yokes"" capacitors c518, & c515. tech replaced all of the capacitors and the symptom "" Muller
SONY KV32S40
AA-2 		Horizontal sweep Kv32s40 ser 8053998 unit has sever over scan of horizontal sweep. tech replaced q512 shorted and q511 open all elements. Measuring the collector of q512 tech finds the voltage running in excess of -7 volts. the voltage on this transistor in inconsistent with the symptom on the screen of a narrow raster that is hourglass shaped. l511 and q512 are burning up. suggest the tech replace the following additional components d502, d503, d504, c511, and c513. Muller
SONY KV27S20
AA-2 		Horizontal lines Sony kv27s20. black banding across the screen. symptom does not appear when playing a tape. Gave tech modification on the kv27s20 to replace c1267 from a .047 to a .47 tantalum capacitor. Muller
SONY KV32S40
AA-2 		Horizontal Unit has severe over scan of horizontal sweep. tech replaced q512 shorted and q511 open all elements. Measuring the collector of q512 tech finds the voltage running in excess of -7 volts. the voltage on this transistor in inconsistent with the symptom on the screen of a narrow raster that is hourglass shaped. l511 and q512 are burning up. suggest the tech replace the following additional components d502, d503, d504, c511, and c513. Muller
SONY KV36FV1
AA-2 		Horizontal Unit has a severe over scan condition for horizontal sweep. tech did not measure any voltages in the pin amp circuit. Tech needs to check on l511, q512, c513, c511, d502 & d504. one or more of these are shorted. Muller
SONY KV35V36
AA-2 		Horizontal Unit has a insufficient horizontal sweep. the sweep is reduced by 10 to 15% on the left side and 2 ~ 5% on the right. When going into the tech set up parameters and adjusting the hsiz value the sweep will replace to full sweep. monitoring the voltage at the collector of @q512 the voltage will vary from 27 volts hsiz set to 22. when hsiz is set to 48 q512(c) will drop to 16 volts. the set will have full sweep but it has a slight foldover condition on the right side of picture. it is recommended the tech replace the retrace capacitors c511, & c513 and the yokes"" capacitors c518, & "" Muller
SONY KV27S25
AA-2 		High voltage Unit has no high voltage. led in front is flashing on and off after power up. Tsound does not seem to be any horizontal drive to the horizontal drive transistor. defeating the horizontal output by removing the collector connection still will not allow horizontal drive to appear at ic351(37). this pin is sitting at nearly 8.5 volts, not the 3 volts it is supposed to be. also ic351(38) the hoff/afcpin is at 3.3 volts which is normal. unit has a bad ic351 cxa2025as Muller
SONY KV36FV1
AA-2 		Geometry Kv36fv1 serial 9032273 tech needs yoke modification for the yoke upgrade. Gave tech bulletin 387r2 relating to the shoulder roll off Muller