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Sony TV KV-36FS76U error code 5 blinks

Sony KV-36FS76U error code 5 blinks (AE5A chassis)
Please can you help me with this TV.
I just got this TV from a guy who has been using it for a year keeping it
alive by playing a fan on the back. I found that it would also work if the back
was removed.If not it would switch off after a few minutes with error code - 5
With the set running I put the back cover back on and within about 4 minutes
it tripped.
I considered which part could be so dramatically effected so quickly and
concluded that the PCB on the tube (the C board) would be the one so simulated
the effect by putting a dry cloth over this PCB. Within about 1 minute it
tripped. However now there is no video at all. Thare is sound for about 10 secs
then it trips and the error code is still 5 flashes. I find it hard to believe
such a minor action could have damaged it. If I disconnect the C board it does
not stop the set from tripping. Also If I disconnect the 2D board that carries
the LOPT it still trips.

I can be Emailed at

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  • Wayne Rogser Dec 26, 2008

    I am having a similar problem with my sony. I was having a problem when I turned it on, you could hear the relay click then in about 5 seconds it would go into diagnostic mode and blink 5 times. I took the back off and played with it turning it off and on and finally it came on and stayed on. After turning it off for the night, the next morning it would take it about 10 times of turning it off and back on for it to stay on, The 5 blinks is telling me it is in the video output section which I assume is the "C" board. Could the power supply board create this problem? Any help would be appreciated.



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I had the same problem, my telly was showing error code 5, led blinking 5 times and then the telly enters into standby mode. There is a great site with pictures of this telly and I found the answer here:

Tube Gone

Posted on Aug 26, 2011

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Cristoffr, this is very, very interesting! I replaced all three ICs per the repair discussed over in Agoraquest:

(scroll about half way down).

This did nothing. However, I had heard that a fan on the back of the TV might keep it from turning off. After the repair failed, I used a fan and for 24 hours the TV has remained on!

The Sony manual for repairing the DX-1A chassis gives testing and possible solutions for each of the blinking codes. About the five blink code it has this to say:

"Blanking - Standby light blinks five timesCircuit - The Ik signals are measured by Y/C, CRT Drive IC201 and areu sed to adjust the RGB gain to maintain color balance. As the picture tube ages, the Ik signals may fall below the threshold for automatic balance and mute/blank the picture. Testing - Increase the G2 control on the CRT’s C board. If that does not return cathode current to within operating range so the picture will appear, examine each filament to see if it is lit.

Then use your scope to examine the signal to the cathode. Go to CN9001/pins 1, 3 and 5 to see if there is a signal coming into the C board. Next check the signal at the CRT cathodes. If they are present, check the IK signal from CN9001/pin 8 of the C board. You should see three pulses and be able to change the level of the signal with the G2 control. If you get about 1Vp-p pulses at pin 8, this is the normal output from the CRT/C board so the problem is on the A board about IC201."

Note, Cristoffr that it mentions the C board in particular, the G2 control. However, it also mentions IC201 on the A board. I am going to post this finding to the Agoraquest board and see if anyone there has any ideas.

At least we have narrowed it down. We with the 5 blink shut-off are rare. Usually with the 5 blink problem the screen *blanks*, yet the TV remains on. I wish we could find a knowledgable tech who could diagnose this. Certainly this much information would lead him/her to a solution. I have heard it might be the flyback transformer, which does have a lead that goes to the C board. Possibly the flyback is not within output limits and the C board is initiating the shut down. Doesn't make sense though, because the power supplies are on the D board. Whew. Who knows? Anyway... I'll keep you posted with any info I gain, and I'd appreciate the same from you.



PS If you want to reach me via email you can at:


But perhaps we should do most of our communication here for the benefit of anyone who has the same problem. Just a thought.

Posted on Nov 21, 2008


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