Sony TV Repair: Common Faults and Solutions.


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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYKP5040
Shut down, replaced high voltage blockDoor would not open. unit would shut down.
SONYKP5000
Out of convergenceGreen would go in and out of convergence as the green tube wasarcing. also brightness level change would affect size of green pictureproducing misconvergence effect.
SONYKX2501
Intermittent black blobs in pix, replaced t1501Black blobs intermittently come and go and move around thescreen. the intensity and size can be varied by adjusting the videoinput level or ac input. by observing the waveforms in the horiz.circuit we found varying amounts of distortion at the secondar
SONYKX2501
Volume level changes with pix control, replace ic101Sound would increase when increasing picture level, decreasewhen lowering picture. adjusting sound control would have similar effecton picture level. mute control would not fully mute sound. pwm signalsfrom up, ic101 pins 2 and 3 were of the same ampl
SONYKV9400
Intermittent colorThis set was intermittently losing color. found horiz. pulsemissing at pin 20 of ic301. traced problem to c311 which was opening up.
SONYKV9200
Retrace linesCustomer objected to three-four vertical retrace lines onlyvisible while watching two channels 9 and 32. lines appeared to sparkleas if they were being modulated with information. scoping verticalblanking pulse, noticed excessive pulse width. working
SONYKV2647R
Black lines on the screen, replace ic501Solid black line across the screen about 1/2 inch thick,2 inches from the top. very intermittent.
SONYKV2647R
No color, replace ic501No color. very low burst.
SONYKV2645RS
No uhf, replaced prescaler bt-981No uhf, vhf ok. all voltages and pulses present excepttp-59.
SONYKV1943R
Intermittent sound, replaced c226Highly intermittent audio. slight popping noise beforegoing out.
SONYKV1923
Tuning up/down would not lockIn the program mode tuning up/down set will not lock onchannel.
SONYKV1914
No soundNo sound. voltage at pin 21 of ic201 was low, should havebeen 5.8 vdc, was only 4.0 vdc.
SONYKV1543R
Intermittent color fade, replaced c308Intermittent color fading. this problem was highly inter-mittent, sometimes taking weeks to manifest itself. the color would fadeout completely. chroma input to ic301 pin 13 would not change at allduring fade outs. dc level was varying slightly, betw
SONYKV1515
No vhf channelLow vhf channels cannot be received. found d501, d502shorted.
SONYKV1221R
No remote control function, replaced c007There were no remote control functions. the volume up/downfunctions would shut set on and off. manual input of ic (remote control)pin 1 always had a noise pulse and frequency at this point was incorrect.this noise pulse inhibited any input data from re
SONYKP7220
No picture, connector da-5 intermittentConnector da-5 gets loose and causes picture tubes to blankout, can also cause a line on green tube which burns to mark in tube.
SONYKP5040
Poor focus, replaced hv blockUnable to get a good focus. problem traced to high voltageblock.
SONYKP5040
Dead, replaced cx171, q5521, q5522Set would not turn on. servicer found cx171 defective whichis believed to have caused q5521 and q5522 to short, fuse found defective.
SONYKV2145R
Set locks on ch 88, replaced ch indicator nd3101Set was locked onto channel 88, unable to clear or change.found pulse out of ic001 on mf board loaded down. traced problem tochannel indicator display nd3101 on ta board. pin 3 on display isshorting to something inside display loading down pin 40 on ic
SONYKV2141R
No picture, leaky d511 zenerUnit completely out of horizontal frequency. at pin 8 ofic501 the dc voltage reads 4v instead of 10v. trouble traced back toleaky d511 (rd15e).