The TV turns on and works normally for a short time but eventually the video shuts off and only the sound is playing. The problem has been getting worse over the past couple of weeks. Initially, unplugging for a while solved the problem and it worked properly for several hours until the next failure. Now it usually fails after a few minutes and unplugging does not always reset it to a good state. Also, it does appear that using the remote for functions like accessing the menu or changing the video input sometimes causes the failure to occur immediately, though changing the volume seems to have no effect. Also, the TV's IR receiver seems to be functioning poorly in general and doesn't always respond to the remote. Have tried it with different inputs and cables to rule out that issue.
Opened it up and visually nothing seems out of the ordinary. I tested all of the fuses and they are fine. Caps appear to be normal. I tested the key voltages and when it is operating correctly they match the specs. After the picture goes out, the voltages (Vs, Va, Vsc, Ve) are abnormal, all under 10V. Only the standby voltage is holding steady at it's normal value of 5.3V.
On the logic board there is an LED labelled LED2000 that flashes in a very slow cycle of about 6 seconds when the picture fails. Normally it flashes every second when working properly. I've read elsewhere that slow flashing indicates a fault on the logic board. I'm thinking that the logic board might be incorrectly putting the TV into a low power or sleep mode state.
The X and Y-mains seem to be functioning correctly because the picture is flawless when the TV is in a good state. Replacing the logic board would be the most obvious solution. Or is this maybe a case of the power board being on the verge of total failure?
Has anyone seen a similar problem before or have any advice about other things to check before I go and order the logic board?
Opened it up and visually nothing seems out of the ordinary. I tested all of the fuses and they are fine. Caps appear to be normal. I tested the key voltages and when it is operating correctly they match the specs. After the picture goes out, the voltages (Vs, Va, Vsc, Ve) are abnormal, all under 10V. Only the standby voltage is holding steady at it's normal value of 5.3V.
On the logic board there is an LED labelled LED2000 that flashes in a very slow cycle of about 6 seconds when the picture fails. Normally it flashes every second when working properly. I've read elsewhere that slow flashing indicates a fault on the logic board. I'm thinking that the logic board might be incorrectly putting the TV into a low power or sleep mode state.
The X and Y-mains seem to be functioning correctly because the picture is flawless when the TV is in a good state. Replacing the logic board would be the most obvious solution. Or is this maybe a case of the power board being on the verge of total failure?
Has anyone seen a similar problem before or have any advice about other things to check before I go and order the logic board?
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