SONY KDL-52ex700: No picture, No sound, No backlight but gets Standby & Green light
We came one evening & realized this problem when tried to turn on the TV (SONY KDL-52ex700), there has been, no sound, no picture, no click sound (for backlight).
Here is the sequence I have checked so far.
1. Pressing the Energy saving switch button, TV used to turn ON green light, get backlight click sound & used to show Sony logo with sound
- None above happen anymore. No green light, No sound, no picture, No backlight
2. Pressing the power switch button used to either put the TV in standby mode OR turn on green light, get backlight click sound & used to show Sony logo with sound
- Now when pressed first time I can do get Red stand by light & after pressing one more time gets green light but then no sound or logo
3. Checked for few minutes, on Green light & it remains solid green & does not turn Red until I press remote button to Standby mode. So Red light do not blink. Remains solid Red.
4. Backlights are not illuminated at any time
4. As per few suggestions changed the main board but all above behavior remains same. Said that I felt "probably" it didn't used to respond to other keys on the remote (like volume, channel change etc). But not very sure (I can replcae the original board & confirm if needed).
5. I checked the voltages & initially felt problem was more likely with logic board, as I do get 3.3V on Stand-by pin on Power board connector as well as Logic board input connector.
6. Gets 3.3V at connector CN6150 (picture attached) but do NOT get voltages on any other pins of the connector, either in Stand-by or Power On mode.
Question is, Do the other pin voltages on CN6150 are triggered thru the main board? Or should they be available all the times once in standby or power ON mode? Should I have replaced the Power board instead of Logic board?
Is there any flow diagram which shows how the voltages exactly flows thru this model of Sony. Unfortunately I didnt find the Schematic Board circuit diagrams for this particular model on any websites.
Will really appreciate any help on this.
Thanks
Sachin
We came one evening & realized this problem when tried to turn on the TV (SONY KDL-52ex700), there has been, no sound, no picture, no click sound (for backlight).
Here is the sequence I have checked so far.
1. Pressing the Energy saving switch button, TV used to turn ON green light, get backlight click sound & used to show Sony logo with sound
- None above happen anymore. No green light, No sound, no picture, No backlight
2. Pressing the power switch button used to either put the TV in standby mode OR turn on green light, get backlight click sound & used to show Sony logo with sound
- Now when pressed first time I can do get Red stand by light & after pressing one more time gets green light but then no sound or logo
3. Checked for few minutes, on Green light & it remains solid green & does not turn Red until I press remote button to Standby mode. So Red light do not blink. Remains solid Red.
4. Backlights are not illuminated at any time
4. As per few suggestions changed the main board but all above behavior remains same. Said that I felt "probably" it didn't used to respond to other keys on the remote (like volume, channel change etc). But not very sure (I can replcae the original board & confirm if needed).
5. I checked the voltages & initially felt problem was more likely with logic board, as I do get 3.3V on Stand-by pin on Power board connector as well as Logic board input connector.
6. Gets 3.3V at connector CN6150 (picture attached) but do NOT get voltages on any other pins of the connector, either in Stand-by or Power On mode.
Question is, Do the other pin voltages on CN6150 are triggered thru the main board? Or should they be available all the times once in standby or power ON mode? Should I have replaced the Power board instead of Logic board?
Is there any flow diagram which shows how the voltages exactly flows thru this model of Sony. Unfortunately I didnt find the Schematic Board circuit diagrams for this particular model on any websites.
Will really appreciate any help on this.
Thanks
Sachin
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