Hi,
I have a LG RZ-27LZ31 LCD TV that doesn't power on. The 5V Stby are OK, but when you try to switch on, a relay clicks on the PSU several times but no other voltage comes from the PSU (5V, 12V, 18V, 24V).
I've tried the PSU alone, making a bridge between the 5Vstby and the DPM line. Same results, so it's not a short in any other TV part.
The PSU is a KN Powertek KNP-3370. The TV service manual doesn't include schematics from this board and I haven't found any.
Any ideas? Which is the primary switching controller or regulator that I have to check first? I don't detect any shorts in switching mosfets, as far as I can check.
I have a LG RZ-27LZ31 LCD TV that doesn't power on. The 5V Stby are OK, but when you try to switch on, a relay clicks on the PSU several times but no other voltage comes from the PSU (5V, 12V, 18V, 24V).
I've tried the PSU alone, making a bridge between the 5Vstby and the DPM line. Same results, so it's not a short in any other TV part.
The PSU is a KN Powertek KNP-3370. The TV service manual doesn't include schematics from this board and I haven't found any.
Any ideas? Which is the primary switching controller or regulator that I have to check first? I don't detect any shorts in switching mosfets, as far as I can check.
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