Forum > LCD TV forum
Bauer XT32 / Phihong PSU fault
Turnip:
Hi Pd,
First met the prob with Profilo tellies, where FSD200 blows a leg and some nearby zeners and BC337, so thought to include a 4R7 (S) in the S/by HT feed should it pop again before repair guarantee had expired.
Sky codes for volume haven't been a prob as wife uses 5 hopeful RCUs for Freeview and Freesat even while washing up.
For reliability, just that 4R7, as there are no other reported problems if recovered with the initial FSD200 bits - if not -
Dave will be bigger with an LG Plasma - Chris.
ProDave:
Okay, making some progress.
I've powered up the tv from bench power supplies. That took longer than it should as I found one output on my twin o/p bench PSU had died, so first job was to repair the bench PSU.
Anyway, fed with 5V, 12V and 24V from bench psu's the set works and has a good screen. So at least I now know it's worth spending money to fix the PSU.
So I'll dismantle and look at the PSU probably tomorrow now.
michael first:
Hi,ProDave take a look at this.As for the main fuse the cause could be one of the two SPP07N60(mosfet) along with the corresponding ICE1QS01.Hope it helps.
ProDave:
Here's what I found. The cause of the blowing main fuse was a short circuit main reservoir capacitor. No other obvious blown parts.
So I put the PSU back together and tried powering it up, with the 5V standby supply coming from my bench power supply. But the rest of the PSU remains dead and the other voltages won't come on.
I'm reluctant to spend much time or money on this PSU, partly because it's a pig of a thing to work on, you have to remove a heatsink and 2 devices (attached to the heatsink) to get to most of the board, with no opportunity to do testing and fault finding. Plus of course there's no guarantee of success.
So I'm in the process of engineering an alternative power supply. Here's what I am doing:
In my accumulation of bits, I had a small Lascar 5V linear psu. This is now providing the 5V standby supply. I also had a Melcher switching regulator that has a 12V output and 20-80V dc input range, so that is providing the 12V power.
The only bit I didn't have is a 24V psu. So I've ordered one from someone on ebay for the princely sum of £16.35
All I need to engineer is some switching (a relay) to power up the 24V psu when the set is turned on and it should all work. (it's currently working with just the 24V supplied from my bench power supply)
This will have the advantage of being cheaper and more certain than any other fix, plus, in theory, it will all be powered with industrial power supply units, rather than a consumer quality PSU so will hopefully be more reliable.
It will sure confuse the next engineer that looks inside the set though.
To all those who know this set, do any of you have a users manual for it? In particular does the hdmi input support HDCP? I'm confused by the labelling on the back of the set referring to it as a DVI input which rather suggests it does not fully implement hdmi and hdcp.
Turnip:
Hi Mike 1st.
Sorry now I mentioned Profilo, it was just that FSD200 pop business, where repairing the original problem sometimes gives a solution, but often - not.
Never dismayed, as local tips are now full of 'em - Chris.
PS - as a thought, RM4040 from Wiltsgrove usually does the biz for Profilo stuff, for XT32 it's IRM1165.
PPS - Hi, Pro Dave, just grateful it does the basic biz - wife happy with Corrie and Emmie, so won't try open any of Pandora's boxes, as tea might be in doubt.
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