Lexsor LC32W18SD psu

[Manddave]

Hi can anyone help please I'm trying to repair this psu
All caps have been replaced but no luck yet.
The tv goes to stand by and there is a slight clicking from the power board

The board is 782.L32U25-200B V07

[multimeter]

Re: Lexsor LC32W18SD psu

need a better pic than that,more light

also what brand of caps did you use and series?

ticking or clicking sound can be due to shorted secondary diodes or failing startup cap,normally around 50_63v ,47uf-****

[Alastair E]

Re: Lexsor LC32W18SD psu

Ah--I know of those hideous PSU's!

LEXOR used a couple of types in their 32" sets, that one illustrated was the cheapest and nastyest!
--probably a later series of their set, The earlier supply was a bit of a beast, Dozens of bright orange caps, all dry out, double-sided print as delicate as tissue, and a bugger to work on without damage.

Check the diodes on the output of the 16 (or is it 17?) and 24V rails, there's two tiny fusible-resistors between the reservoir caps on the 'cold' end of the board after the recs, and between the caps--in series with the supply --should be very low resistance, summit like 0.2 ohm.

These are in series with the supplies and before the second cap in each rail.

You can confirm whether they are good by checking the '+' of each of the two caps in each rail for continuity--should have a low reading.

--Obviously,--there will be no continuity between each rail though....

A voltage-check across each of the Low-Voltage, (stdby 5, 12, 17, 24V) rail caps will also indicate the condition of the resistors, and also checking the plug headers with 5V input from stby 5v to Ps-on, header-pins via 1k
(could use the set to turn psu on, but I tend to work on the PSU on its own--much easier to work on....)

Cheap cruddy caps wont stop those supplies working--They just wont last very long, (talking hours or days) so I doubt that the cap quality is the issue to stop it running. (been there, Done that!)
From what you describe--the supply isnt 'loaded' and its in 'burst-mode'--hence the ticking/tripping sound....
--This also points to those series resistors....