Sony Bravia KLV-32v550A Blinks 8 Times

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

Yes.
I have a feeling that your main board is slowly dying.

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

i have connected standby 3.3V to Pin 29 (Pin 29 is still connected to board, i have not lifted it) and after 2-3 minutes picture freezes and tv itself switching on and off most of the time backlight fails to turn on...

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

There is no need to lift that pin 29 because you already lift pin 43 (output pin) of the other IC already.
"and after 2-3 minutes picture freezes and tv itself switching on and off most of the time backlight fails to turn on" So the 8-blink codes went away and you are able to get the pictures but the pictures freeze.
I do not think there is much more you can do at this point.

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

yes 8 blinks error is sorted now i need to work on 10 blinks, tv worked for more than hour and ended up with 10 blinks and then restarting again and again and most of time i can see green light on but no picture...

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

Well, let me see if I will have the time to study the circuits again.

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

Allright

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

Hi
another major problem, Backlight don't turn on most of the time, its getting proper voltage, i have checked 24 volts but it turns on after approx 20 attempts

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

You need to look at the BL-ON (or INVR -ON) to see if the main board if the Main board is sending the ON command signal or not, you also need to look at the Dim or PWM Dim command signal also. It seems to me the main board is failing so all these things are happening.

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

INR-ERR Reads 1.90 volts
Backlight ON reads - 0 volts
Dimmer reads - 0 volts

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

INR-ERR Reads 1.90 volts
Backlight ON reads - 0 volts
Dimmer reads - 0 volts

Well, the main board is not sending either of the two command signals (BL-ON, DIM).

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

I have checked almost all resistance on board,
it reads INR-ERR Reads 0.55 volts
Backlight ON reads - 0 volts
Dimmer reads - 0.86 volts

Backlight is coming from ic5502 (MB91F313APMC-GE1) pin 78 and it reads 0 volts on ic, does it means ic is defective or ic is not getting input volts?
what should i do now??
Please suggest.

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

"Backlight is coming from ic5502 (MB91F313APMC-GE1) pin 78 and it reads 0 volts on ic, does it means ic is defective or IC is not getting input volts?
what should i do now??" It can be that chip is not running or something else causes it to be stuck in that mode. I have no idea how far you can go at this point.

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

hello just checking if you got some time to read the circuit again??
waiting for your kind reply

[budm]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

Sorry I have been out for a while, and still recovering (https://www.badcaps.net/forum/showthread.php?t=48410). I do not have the time right now to look back on what we have done to this TV since my last post.

[pawangulati]

Re: Sony Bravia KLV-32v550A Blinks 8 Times

Very sorry to hear this, I wish you a speedy recovery, Take rest, Good Luck