Greetings!
This is my office TV and came back to work after the weekend to find the TV with blue power light on (which is normally the on state), but no picture. Power had gone off over the weekend in the building. Also, found that TV was plugged into a 3 prong outlet surge protector with the ground prong cut off sometime in the past. Tried resetting the AC and found that it clicks on when plugged in, no panel prime, blue LED turns solid, can hear fans come on, then another click as if it's shutting down, but blue LED stays on. Pressing power will not do anything; it's just stuck that way.
Voltage readings on power supply:
connector: CN64
VA: goes to 4.0v at initial click, then to 66v (full) when fans come on, but goes back to 4.0v when shutdown click is heard, then slowly to 0v.
VS: goes to 4.0v at initial click, then only to 66.6v (full is 89.5v) when fans come on, but goes back to 4.0v when shutdown click is heard, then slowly to 0v.
Vcc5.1: goes to 5.1 after initial click, but drops to 0v when shutdown click occurs.
connector: CPPS
15v: comes up to 15v at initial click, drops to 0v at shutdown click.
16v: comes up to 16v at initial click, drops to 0v at shutdown click.
10v: does not come up (0v)
5.4v comes up to 5.6v at initial click, drops to 0v at shutdown click.
connector: CN8
REC_STBY: comes up to 3.1 with initial click and drops to 0 when shutdown click occurs.
POD_STBY: comes up to 4.7 with initial click and stays at 4.7 even when shutdown click occurs.
AC-CLOCK: 4.6v when TV off, goes to 3.3v when clicks on and stays at 3.3v when shutdown occurs.
POWER_OFF: 3.9 when TV off, goes to 0v and stays at 0v through shutdown.
STBY: 5.2v constant.
connector: CN68
Vcc5.1 (same as above reading on CN64)
Vra: goes to 1.7v when fans start, then goes to 0v when shutdown clicks.
Vrs: goes to 2.3v when fans start, then goes to 0v when shutdown clicks.
Vcego: goes to 2.3v when fans start, then goes to 0v when shutdown clicks.
Vsago: goes to 2.7v when fans start, then goes to 0v when shutdown clicks.
Note: Disconnecting CN64 will stop the TV from automatically coming on when AC applied; instead it will have a red standby LED and you can press power, but VS and VA will be at that 4.0v, but never ramp up and the blue LED will blink a x4 code.
What I've replaced:
Logic board replaced (used) no change in symptom.
Main digital board (used) (the one with the HDMI connectors) replaced and no change in symptom.
Note: I've also removed both Y-DRV buffers completely and no change in symptom.
Any help would be greatly appreciated!
This is my office TV and came back to work after the weekend to find the TV with blue power light on (which is normally the on state), but no picture. Power had gone off over the weekend in the building. Also, found that TV was plugged into a 3 prong outlet surge protector with the ground prong cut off sometime in the past. Tried resetting the AC and found that it clicks on when plugged in, no panel prime, blue LED turns solid, can hear fans come on, then another click as if it's shutting down, but blue LED stays on. Pressing power will not do anything; it's just stuck that way.
Voltage readings on power supply:
connector: CN64
VA: goes to 4.0v at initial click, then to 66v (full) when fans come on, but goes back to 4.0v when shutdown click is heard, then slowly to 0v.
VS: goes to 4.0v at initial click, then only to 66.6v (full is 89.5v) when fans come on, but goes back to 4.0v when shutdown click is heard, then slowly to 0v.
Vcc5.1: goes to 5.1 after initial click, but drops to 0v when shutdown click occurs.
connector: CPPS
15v: comes up to 15v at initial click, drops to 0v at shutdown click.
16v: comes up to 16v at initial click, drops to 0v at shutdown click.
10v: does not come up (0v)
5.4v comes up to 5.6v at initial click, drops to 0v at shutdown click.
connector: CN8
REC_STBY: comes up to 3.1 with initial click and drops to 0 when shutdown click occurs.
POD_STBY: comes up to 4.7 with initial click and stays at 4.7 even when shutdown click occurs.
AC-CLOCK: 4.6v when TV off, goes to 3.3v when clicks on and stays at 3.3v when shutdown occurs.
POWER_OFF: 3.9 when TV off, goes to 0v and stays at 0v through shutdown.
STBY: 5.2v constant.
connector: CN68
Vcc5.1 (same as above reading on CN64)
Vra: goes to 1.7v when fans start, then goes to 0v when shutdown clicks.
Vrs: goes to 2.3v when fans start, then goes to 0v when shutdown clicks.
Vcego: goes to 2.3v when fans start, then goes to 0v when shutdown clicks.
Vsago: goes to 2.7v when fans start, then goes to 0v when shutdown clicks.
Note: Disconnecting CN64 will stop the TV from automatically coming on when AC applied; instead it will have a red standby LED and you can press power, but VS and VA will be at that 4.0v, but never ramp up and the blue LED will blink a x4 code.
What I've replaced:
Logic board replaced (used) no change in symptom.
Main digital board (used) (the one with the HDMI connectors) replaced and no change in symptom.
Note: I've also removed both Y-DRV buffers completely and no change in symptom.
Any help would be greatly appreciated!
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