Question about Sony KV-27V42 27" TV
My KV27S42 is dead and red front led blinks 4 times when I plug it or switch ON then stop after 3 cycles (15 seconds). I replaced the IC541 with no success and I noticed that lots of voltages are missing (+13V, -13V, +135V and +200V on PCB A). I can hear the relay RY602 clicking and it supplies the 120VAC. I do not see any short between the +13V and -13V inputs of IC541 (pins 2 & 4) but when the multimeter is set to 20 Ohms, I can see the value increasing slowly, I think it is due to the capacitor between the inputs 2 & 4 of IC541, I did not check with IC541 floating. Resistances R561 & R562 are good with 0.47 Ohms.
I would like to jump the relay RY602 to achieve high voltages to see all functions working normally but it seems that all voltages are removed when the relay RY602 contacts close.
Any idea ?
The +13 and -13 are generated by the flyback transformer as well as the 200 volts. the 135 is your B+ voltage and sould be there at start up. check the HOT and the Flyback. if there is no 135v check IC1751 on the C board sometimes if bad it loads down the 135v line. and can give a faulse vertical error.
Posted on Apr 02, 2008
I also have the exact same problem but mine is the 27V42....I think the circuity is almost the same. I tried replacing the IC601, IC1751, and IC541 as suggested in some of the posts but to no avail. I'll try to check the Q502 for short between B-C and E-C and possible replace it also. Interestingly, a month before my set died I get a loud vibration whenever I turn on the set. It vibrates the entire TV which last about <1sec but the TV will turn on. Not sure if this had anything to do with the failure.
Posted on Apr 11, 2008
If you already change IC1751, I would suggest to check IC601 on the power supply just to see if the voltage is getting to T603.
Try to disconnect and isolate lead # 2 from the FBT to be able to measure the voltages in the power supply circuitry.
Download the service manual if you do not have it yet.
Let me know if you need further assistance.
Posted on Apr 02, 2008
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