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Sony Repair Tips




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Search: sony
Results: 20072
Make Model Symptom Problem Solution By
SONY KP46S25
RA1 		No green Sony kp46s25. unit turns purple (looses green) Tsound has been a case history problem with the sample and hold capacitors c313, c314, c315 in the jungle ic circuit. these devices become leaky and cause a loss of 1 specific color. Muller
SONY KP53S25
RA1 		Lines Kp53s25.. horizontal lines in pix in the tuner video and osd. actually the lines appear as gaps between the normal scan lines. Problem appears to be related to the jungle chip. the vertical drive signal is supposed to be a clean saw tooth wave form but when the problem showed up on the screen the saw tooth develops sharp and rapid deviation in the the angular movement of the wave. replacement of the jungle ic Muller
SONY KP53XBR45
RA1 		Line paring Sony kp53xbr45 ra1 chassis. unit has line paring. ?this condition is when the vertical scan rated changes an possibly reverse directions quickly then return to normal again I had tech freeze the jungle chip which stopped the symptom. heating the chip aggravated the symptom. this is caused by the jungle chip Muller
SONY KP53XBR45
RA1 		Keyboard Sony kp53xbr45 when the power is turned off at the set the tv will turn back on again Install a de-bouncing capacitor 2.2 mfd@ 16vdc) between the low and high side of the power on/off switch. the front screen will have to be removed to accomplish this. Muller
SONY KP46S25
RA1 		Horizontal Kp46s25 this set has horizontal overscan. tech was trying to find a failure in the circuit that houses q811. The tech was in wrong area of the chassis. the area he should be in is the horizontal output not the high voltage output. the set uses q510 as h. output, and q509 as pin output. tech needs to verify the presence of vertical parabolic drive signal at r501 on the ""a"" board. "" Muller
SONY KP53XBR45
RA1 		Horizontal Kv53xbr45 unit has horizontal overscan Tech needs to look at the vertical pin correction signal on the ""a"" board cn304(5). this signal must be about 1 volts peak to peak of a vertical parabolic waveform riding on a 2.7 volts dc level. if the voltage is significantly over three volts the pincushion ciircuit will saturate and damage will occur. if the voltage is too high, too low, or missing the parabolic wave the jungle ic should be suspect. "" Muller
SONY KP53XBR45
RA1 		Dead Kp53xbr45 serial number 9017123 unit is dead. the set went up in smoke. customer unplugged the set and called for service. Unit has burned a board on the corner 1e coordinated. this circuit is for the dynamic focus output and the 3 horizontal deflection yoke drives. the corner is completely burned away from the a board. tech will need a replacement aa board a1297-540-a. Muller
SONY KP46S15
RA1 		Dead Unit will not turn on. at no time can a ""click"" be heard from the ""g"" board when the power is applied or when the power is turned on. "" I had the tech measure the standby b+ at the input of ic652(1) the voltage should be 24 vdc. we only had 9 volts. checking with an oscilloscope we found 22 volts peak to peak on the input of the regulator. unit had defective c667 a 470mfd@ 35 vdc. replacing the capacitor corrected the Muller
SONY KP41T15
RA1 		Dead Unit is dead. was hit by a power surge. d655 was defective. unit still will not power up after the device was replaced All power supplies are normal in operation. unit has horizontal sweep when checking the q505(c) we have over 900 v peak to peak . we do not have high voltage or high voltage drive to q801(b) or q810(b) find no horizontal drive. checking the hv protection circuit finds the ic902(1) is sitting at 6.2 volts. this is because ic902(7) is higher than ic902(6). this is attached to the ocp circuit. it is conceivable the flyback is shorted due to the fact the 135 vdc ocp line is being triggered. unit did have a shorted Muller
SONY KP46S15
RA1 		Dead Unit has an overheated standby transformer. the 20 volt power supply is running at 3 volts. I had tech disconnect the connectors to the ""m"" board m cn653 on the ""g"" board. this removed the load on the 20 volt stand by and let the 12 volt stand by to rise to near 20 volts too. it is possible we have two regulators bad ic652 and ic001. ic001 may have been damaged by too much voltage on its input because of a defective ic652. or tsound is a severe load on the output of ic001 the 5 volt standby on the ""m"" board wsound the 12 volt stand by enters on connector cn053 pin 1 then to the ic001 a post 5 volt regulator. tsound is also a 1000 mfd @ 6.3 vdc on the output of the 5 volt post reg. suggest the tech bring out both regulators and the capacitor c002 as a precaution. "" Muller
SONY KP46S15
RA1 		Dead Dead. unit has leaking crt's. both red and blue crt's are noticeably leaking with the green showing signs of moisture around the expansion chamber. Unit will need replacement crt and the convergence output ic's. Muller
SONY KP61XBR48
RA1 		Dead Kp61xbr48 unit is dead. q601 & q602 are shorted along with r607 open. preliminary checks of the secondary loads on this supply indicate no shorts circuits. replacement of these devices again resulted in the instant failure of these transistors again. Forcing the power supply on with artificial loads on the + & -135 vdc power supply allowed the supply to run correctly. high voltage was disabled by removing g4 connector. this disables the b+ to the high voltage output transistor q801. it should be known this television has a high voltage output transistor and a horizontal output transistor q508. with the hv disabled we could check out the h. output stage with reduced b+ and current by placing a 40 watt light bulb in series with the -135 power supply. al power up with the shutdown defeated, the bulb lit up brilliantly. this indicated too much current. a process of elimination indicated c514 was breaking down under operating voltages. the value was a .0068 @ 1.2kv. i physically measured .001 mfd. replaced Muller
SONY KP61V25
RA1 		Dead Kp61v25 serial 9001930 dead Unit has no high voltage. ""e"" board is wet from glycol coolant leak from the red and blue crt's that are leaking red an blue tube "" Muller
SONY KP46S26
RA1 		Dead Kp46s26 serial 9003745. the set is completely dead All three tubes are leaking. coolant leaking on ""e"" board. "" Muller
SONY KP46S15
RA1 		Dead Kp46s15. unit has an over heated stand by transformer. the 20 volt power supply is running at 3 volts. I had tech disconnect the connectors to the ""m"" board m cn653 on the ""g"" board. this removed the load on the 20 volt stand by and let the 12 volt stand by to rise to near 20 volts too. it is possible we have two regulators bad ic652 and ic001. ic001 may have been damaged by too much voltage on its input because of a defective ic652. or tsound is a sever load on the output of ic001 the 5 volt standby on the ""m"" board wsound the 12 volt stand by enters on connector cn053 pin 1 then to the ic001 a post 5 volt regulator. tsound is also a 1000 mfd @ 6.3 vdc on the output of the 5 volt post reg. suggest the tech bring out both regulators and the capacitor c002 as a precaution. as a idea this board can be worked on outside of the "" Muller
SONY KP46S15
RA1 		Dead Kp46s15 serial 9013723 dead. unit has leaking crt's. both red and blue crt's are noticeably leaking with the green showing signs of moisture around the expansion chamber Unit will need replacement crt and the convergence output ic's. Muller
SONY KP41T25
RA1 		Dead Kp41t25 serial 9006330 unit is dead. Further checking has discovered the ""e"" board has a large hole burned through the board caused by a coolant leak from one of the crt "" Muller
SONY KP41T25
RA1 		Dead Kp41t25 serial 9003158. unit is dead. all three tubes are leaking. unit has been leaking for quite a while. The ""e"" board is heavily corroded and cannot be sμFficiently cleaned. e module and all 3 crt's must be replaced. "" Muller
SONY KP41T15
RA1 		Dead Kp41t15. unit has coolant leak which destroyed the ""e"" board. "" Unit will need a replacement ""e"" board. "" Muller
SONY KP41T15
RA1 		Dead Kp41t15 unit is dead. was hit by a power surge d655 was defective. unit still will not power up after the device was replaced All power supplies are normal in operation unit has horizontal sweep when checking the q505(c) we have over 900 v peak to peak . we do not have high voltage or high voltage drive to q801(b) or q810(b) find no horizontal drive. checking the hv protection circuit finds the ic902(1) is sitting at 6.2 volts. this is because ic902(7) is higher than ic902(6). this is attached to the ocp circuit. it is conceivable the flyback is shorted on this due to the fact the 135 vdc ocp line is being triggered. unit did have a Muller