Question about Televison & Video
KV-36FS76 (AE5A chassis) sound for 15 secs then 5 blinks)
The previous owner of this TV kept it on by playing a fan on the back. I have taken the back off and it ran OK. Put back back on and it shuts down after a minute. Now hoever theres no picture at all (sound OK) and it shuts down after 10 secs. tried disconnecting panel C (on back of CRT) and then Panel 2D (Line output) but still trips after 10 secs.
Your help appreciated.
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Posted on Jan 02, 2017
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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