Sony Kv32Fs12 with stand by light blinking 2 times.

[SEAWOLF]

I am repairing a Sony KV32fs12 which tries to start up and then stand by light displays 2 blinks.I have tested the flyback transformer and the HOT, and
they have tested good.Can anyone offer any help with this problem?

[freakaftr8]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

Do you get any high voltage upon startup at all before shutdown? Like can you hear the crackle of high voltage?

[RON_CET]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

Here's the Service manual in case you don't have,when set shuts down and you get the 2 blink code do you here any ticking sound coming from IHVT (flyback)? Next have you measured the 135 volt dc supply @ pin 1 of connector CN515? if so is it steady before shutdown or is it unstable or want come up to full supply?

[SEAWOLF]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

Do you get any high voltage upon startup at all before shutdown? Like can you hear the crackle of high voltage?

Yes I get HV at startup before shutdown.

[SEAWOLF]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

Here's the Service manual in case you don't have,when set shuts down and you get the 2 blink code do you here any ticking sound coming from IHVT (flyback)? Next have you measured the 135 volt dc supply @ pin 1 of connector CN515? if so is it steady before shutdown or is it unstable or want come up to full supply?

I have the Service manual and I do not hear any ticking sound coming from
the flyback.The B+ is 137V at startup and the relay clicks a 2nd time and the B+ diminishes slowly.There is also HV at startup.

[freakaftr8]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

Ok. Disconnect the socket from the neck of the crt and see if you still get shutdown 2 blinks. This being B+ shutdown could be anything but start with basics. Looking for a heater cathode short in the crt or possibly a bad IC702 short on the CA board.

I believe it's considered the crt neck board.

[RON_CET]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

2 blink is the +135 OCP and H Protect to help determine which use this attachment,yes also what (freakaftr8) is saying a defective IC702 can cause this issue also

[ivtec]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

I am repairing a Sony KV32fs12 which tries to start up and then stand by light displays 2 blinks.I have tested the flyback transformer and the HOT, and
they have tested good.Can anyone offer any help with this problem?

check r595,330k off e of q532 ocp latch

[R_J]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

I have replaced ic702 in the past, disconect cn502 from the CA board and see if it stays on, if the ic is shorted it will kill the +200v, also check D501,504,one of them could be shorted, they are off of the horz. output transistor, Its been years since I worked on one of these.

[SEAWOLF]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

Ok. Disconnect the socket from the neck of the crt and see if you still get shutdown 2 blinks. This being B+ shutdown could be anything but start with basics. Looking for a heater cathode short in the crt or possibly a bad IC702 short on the CA board.

I believe it's considered the crt neck board.

I have disconnected the crt socket and there is still shutdown and 2 blinks.I have also disconnected the 200v supply to the crt board,and there is still 2 blinks and shut down which rules out IC702 on the CA board.

[SEAWOLF]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

check r595,330k off e of q532 ocp latch

I have not located r595 or q532,and I have not found these in the list of components in the service manual.

[SEAWOLF]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

I have replaced ic702 in the past, disconect cn502 from the CA board and see if it stays on, if the ic is shorted it will kill the +200v, also check D501,504,one of them could be shorted, they are off of the horz. output transistor, Its been years since I worked on one of these.

I have disconnected cn502 from the CA board and checked D501 and D504 and have found IC702,d501 and d504 to be ok.

[SEAWOLF]

Re: Sony Kv32Fs12 with stand by light blinking 2 times.

2 blink is the +135 OCP and H Protect to help determine which use this attachment,yes also what (freakaftr8) is saying a defective IC702 can cause this issue also

I have tried all that is contained is this attachment and the same problem is still present,very good information.