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Sony Repair Tips




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Search: sony
Results: 20073
Make Model Symptom Problem Solution By
SONY KP53S55
AP 		High voltage Unit has no high voltage, tech replaced the high voltage block and the set still has no high voltage. Measuring the b+ 's at the ""a"" board connector a2(1 &9) we find -90 & +115 respectively. the -90 is wrong. it should be 135 vdc. measuring the collectors of the drivers for the hv output q806, we find the voltage at 122. this would indicate the horizontal drive may be missing. tech needs to look at the h driver circuit for a no drive condition. "" Muller
SONY KP53XBR35
AP 		Ghosting Kp53xbr35 after unit has been playing a while the picture will duplicate it self on the left side of screen. customer was able to take a photograph of the symptom, The duplicated picture is in the proper chroma phase, sync, brightness, and contrast. but is slightly elevated in height about 3 or 4 horizontal lines. the symptom may stay on the screen for a few minutes or several hours. the second phantom picture is delayed by, what calculates in the photograph, 31 microseconds which is about 1/2 h. forwarding this case to sony. this symptom is intermittent. recommend the digital comb filter for this unit to be replaced. since the jungle ic was replaced to try and correct this symptom with. the digital combfilter is the only thing that could cause the storage of several lines of video and insert it in the wrong spot if the digital counters in the combfilter malfunction. swapping the combfilter cured the Muller
SONY KP53V15
AP 		Dead Unit is dead. will not turn on. just shuts down Q811 shorted. tech replaced the transistor with a 2sd188. tech checked the distribution of high voltage for pin holes in the lead dress. nothing was found. the transistor did not overheat and he let it run for 45 minutes. suggest the set run for a while and see if it shorts again. all looks well in its operation. Muller
SONY KP46S55
AP 		Dead Unit is a dead set. unit has an extremely hour glass picture. q508 getting very hot. Tech needs to check the b+ on the emitter of the horizontal output. tech will need to check the areas around the q508 and it's drivers. it was found the voltage was normal but q508(c) was at -106 vdc. but further visual inspection on the driver q507 found ring fractures in the solder connections in this circuit.. while the voltages were being measured the set began to operate correctly. Muller
SONY KPR53EXR15
AP 		Dead Kpr53exr15. unit had no power unit has q603 and q614 are shorted. when all are replaced only q614 shorts. Tech needs to apply power to this unit easily, with the use of a variac. while watching current go up gradually. suggest that the ""d"" board be disconnected and see if it will turn on with no more than 1 amp of current. it did not. an amp of current was reached at 38 vac.. further checking found a "" Muller
SONY KP46S55
AP 		Dead Kp46s55 serial 9104007 unit is a dead set unit has an extremely hour glass picture. q508 getting very hot. Tech needs to check the b+ on the emitter of the horizontal output. tech will need to check the areas around the q508 and it's drivers. it was found the voltage was normal but. q508(c) was at -106 vdc. further visual inspection on the driver q507 found ring fractures in the solder connections in this circuit.. while the voltages were being measured the set began to operate correctly. Muller
SONY KP41EXR96
AP 		Dead .kp41exr96 unit dead. will not power up. but will turn if the convergence board is disconnected The 15 or -15 volt supply was missing?.diode d605 shorted. tech should check all devices on the + and - 15 volt supply line as well as the 4 post regulators on the ""d"" board. tech found a shorted c1742 located on the ""d"" board. it connects between the -15 and + 15 regulators ic905, ic906. "" Muller
SONY KP41EXR96
AP 		Dead .kp41exr96 unit dead. will not power up. but will turn if the convergence board is disconnected. customer claimed, ""picture separated in to colors then the tv went out."" "" No 15 or -15 volt supply?.diode d605 shorted. feeds all devices on the + and - 15 volt supply line. note the replacement dual diode be sure it is a common anode device. Muller
SONY KV35S40
AP 		Crt 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 there 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 KP53S25
AP 		Crt Kp53s25 serial 9002282 unit has burned tubes caused by the word ""video"" is burned on the screen "" This unit has 3 defective crt's that have letter burns on them. all three tubes need replacement. Muller
SONY KP53V15
AP 		Convergence Unit has a pulsating red convergence . Tracing the pulsating we find the output of ic506 has a pulsing on it that is coinciding to the pulsing on the screen. unit has a defective ic506. Muller
SONY KP53V15
AP 		Convergence Sony kp53v15 ap chassis. this unit will not allow the customer convergence centering to function. tech needs to know where the electronic centering takes place. Electronic centering is accomplished by the customer using the remote. serial data codes will instruct the bus decoder ic506 to replace the d.c. offset voltage to ic551 on ""v board"" defective ic551. "" Muller
SONY KPR46EXR1 5
AP 		Convergence Kpr46exr15 unit has no control over the red or blue horizontal centering for the customers convergence adjustment. Suggest the tech check the possibly that a problem on the ""a"" board ic506 may be causing the trouble. this ic controls both the horizontal and vertical centering of the red and blue crt registrations. the horizontal correction voltages are simply a dc voltage that is fed to the ""v"" board. the ""v"" board houses the ic's and drivers that will replace the dc offset voltage that effects the horizontal centering. however these circuits were operating correctly. it was determined that ic902 was running warmer than normal. unit had defective ic902 cxa1268p the wave generator was defective. "" Muller
SONY KP53V15
AP 		Convergence Kp53v15 serial 9011915 unit was serviced by another service vendor. unit has a pulsating red convergence . Tracing the pulsating we find the output of ic506 has a pulsing on it that is coincident to the pulsing on the screen. unit has a defective ic506 Muller
SONY KP46V15
AP 		Convergence Kp46v16. unit does not have control of red horizontal centering Tech needs to look at the output of ic506(5) for the red horizontal centering. this ic is the bus decoder that decodes the data to 4 separate outputs. each output is for red h & v, b h & v centering. since the centering is fine for the b horizontal and poor for red it is suggested too replace the ic. new ic corrected the symptom. Muller
SONY KP53XBR45
AP 		Control panel Kp53xbr35 unit has symptom of when the volume up is activated the channel down is activated instead. all other buttons act normally on this analog string. tech did not check the other analog string which is where the ""menu, +, -, and display key. "" There are two identical analog keyboard voltage dividers attached to the ksens0 & ksens1 lines to the microprocessor. the should act identical in operation. the switches that acts as the volume up was swapped with the menu key switch. the volume switch began working correctly and the menu stopped. the switch was replaced and now it works correctly. Muller
SONY KP61V15
AP 		Arcing Tv will turn on but the front panel led will continually blink on and off. unit gets high voltage but has a lot of arcing around the high voltage distribution block. unit does have sound and has vertical sweep. the chassis is heavily corroded due to the environment. unit is located next to an open window that receives ocean spray from the surf. After closer inspection tech found the focus screen block assembly wires were falling off of the assembly. cleaning the connections with water and thoroughly drying the connections then resoldering them to the block assembly corrected the fault. Muller
SONY KV32SR10
ANU-2 		Raster Kv32sr10 unit has dark raster with flaring across the picture. Measuring the g2 voltage at 1000 vdc power supply for the g2 only finds 62 volts. r519 is open. replacing r519 a 2.2k resistor & d501. Muller
SONY KP41EXR96
ANU-1 		Dead Sony anu-1 chassis. unit has defective horizontal output transistor Apparently nothing else is damaged with this chassis. however if the horizontal output is shorted after several hours of operation. unit has defective horizontal driver transformer and driver transistor. leads on driver transformer show signs of oxidation Muller
SONY KV27HSR10
ANU1 		Raster Unit has intermittent raster. bringing up the g2 voltage stops the intermittent action of the crt Remove the following parts on the c-board. r754 resistor, 10kΩ, c719 capacitor, electrolytic 22nf/25v, r755 resistor, 5mm jumper, 330Ω. confirm and readjust the g2 for correct white balance. Muller