Hello,
I've got this TV with two faults originally. One was the master inverter blown a ceramic cap. I've fixed that and the TV works fine again. The second issue is really confusing me. I'm not sure where to start.
Basically the TV gave this fault where you would turn it off expecting it to stay in standby, but instead it would turn back on again immediately. I checked the PSU board all over, re soldered a few cold joints but no change. Disconnected the power button, no change. Checked PSU caps, all good ESR, no bloating.
Then i proceeded to disconnect the POWER_ON wire going from the mainboard to the PSU to see if it was the PSU restarting itself or if the mainboard was indeed signalling for the TV to turn on again. After disconnecting POWER_ON, the TV stayed off properly with the standby led static. So this lead me to believe the fault is with the mainboard.
Now it gets weirder. Sometimes i noticed this fault never occurred, it's intermittent... BUT after lots of head scratching ive now discovered that this fault only happens if:
*The antenna is connected and the TV is on digital tv source*
If i disconnect the antenna, all is well. The tv can be turned off and it stays off.
I can also leave the antenna connected, provided that the tv source in NOT on dtv. So if it's on AV1 for example, i can leave the antenna connected and the TV will stay off when turned off.
Iv'e also cleaned all the connectors on the mainboard, HDMI's, Composite's etc. Turned off the "auto on" feature that can make the TV come on when a device is connected. Updated firmware to latest. No change.
Any ideas where i might be able to start troubleshooting the main board?
I'll get a picture taken asap, but any guidance would be appreciated.
Thanks,
James.
I've got this TV with two faults originally. One was the master inverter blown a ceramic cap. I've fixed that and the TV works fine again. The second issue is really confusing me. I'm not sure where to start.
Basically the TV gave this fault where you would turn it off expecting it to stay in standby, but instead it would turn back on again immediately. I checked the PSU board all over, re soldered a few cold joints but no change. Disconnected the power button, no change. Checked PSU caps, all good ESR, no bloating.
Then i proceeded to disconnect the POWER_ON wire going from the mainboard to the PSU to see if it was the PSU restarting itself or if the mainboard was indeed signalling for the TV to turn on again. After disconnecting POWER_ON, the TV stayed off properly with the standby led static. So this lead me to believe the fault is with the mainboard.
Now it gets weirder. Sometimes i noticed this fault never occurred, it's intermittent... BUT after lots of head scratching ive now discovered that this fault only happens if:
*The antenna is connected and the TV is on digital tv source*
If i disconnect the antenna, all is well. The tv can be turned off and it stays off.
I can also leave the antenna connected, provided that the tv source in NOT on dtv. So if it's on AV1 for example, i can leave the antenna connected and the TV will stay off when turned off.
Iv'e also cleaned all the connectors on the mainboard, HDMI's, Composite's etc. Turned off the "auto on" feature that can make the TV come on when a device is connected. Updated firmware to latest. No change.
Any ideas where i might be able to start troubleshooting the main board?
I'll get a picture taken asap, but any guidance would be appreciated.
Thanks,
James.
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