Picked up this PALSONIC PDP4225HD PLASMA TV .
Conditons are : Plugged in: RED STDBY LED . PWR ON: Blue LED + Smokin PSU. No picture or sound.
Tracked the smoke to these RU4YX rectifiers.
Scavanged a couple of FR304 rectifiers from another PSU and got the set fired up but now has no sound.
The 24V appears to be missing and the R2A15112FP audio chip runs off the 24V so most likely the reason nil audio. The headphone output which uses a different chip is fine so all I need to do is figure out how the 24V is produced.
In the first shot you'll see a small 125V 3A fuse (green) directly next to one of the diodes. I saw it there, too lazy (and slack) to test it whilst I was poking around with the diodes. Since it fired up I thought the job was done until the no sound.
Schematics really help luckily I had a copy for the Sanyo equivalent.
Fuse replaced and sound is now back.
This set is electrically identical to the SANYO PDP-42XR9DA vers 1 & 2 with the main board re-located to the bottom instead of the side. Also most likely means another XOCECO built set but at least I can use the Sanyo manual for fault finding. This also means most likely similar to some DYNEX models as well.
If anyone nows what may cause these to fail I'd be interested to hear about it thanks.
Conditons are : Plugged in: RED STDBY LED . PWR ON: Blue LED + Smokin PSU. No picture or sound.
Tracked the smoke to these RU4YX rectifiers.
Scavanged a couple of FR304 rectifiers from another PSU and got the set fired up but now has no sound.
The 24V appears to be missing and the R2A15112FP audio chip runs off the 24V so most likely the reason nil audio. The headphone output which uses a different chip is fine so all I need to do is figure out how the 24V is produced.
In the first shot you'll see a small 125V 3A fuse (green) directly next to one of the diodes. I saw it there, too lazy (and slack) to test it whilst I was poking around with the diodes. Since it fired up I thought the job was done until the no sound.
Schematics really help luckily I had a copy for the Sanyo equivalent.
Fuse replaced and sound is now back.
This set is electrically identical to the SANYO PDP-42XR9DA vers 1 & 2 with the main board re-located to the bottom instead of the side. Also most likely means another XOCECO built set but at least I can use the Sanyo manual for fault finding. This also means most likely similar to some DYNEX models as well.
If anyone nows what may cause these to fail I'd be interested to hear about it thanks.
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