samsung PS-42Q7HD power supply schematic wanted

[markymark]

does anyone have or know where i can get the power supply diagram for the samsung model number: ps-42q7hd. ?

i need to replace a zenner diode marked Z22AP but need to know voltage & watt rating for this diode.

thankyou

[vtech]

Chances of finding the diagram are pretty slim. But I can tell you that in general, if/when you can see a marking on a Zener, it is pretty safe bet to select it as it's rating . In this case 22volt and if a glass package, 1 watt will do.
Another way to check is to look at the dc rating of any of the electrolytic capacitors that are tied to the same line which will usually be close or slightly higher than the actual value(22). More than likely the Zener in question is used as a crow bar protection on that line and may OR may not be the only problem in the circuit?
Also in looking at the following page on a Samsung, toward the bottom half of the page, you can see the same diode listing with 3 more using the same Zxx listing for glass Zeners which translates to...18V, 22V, 4.7v,9.1v respectively
http://www2.electronicproducts.com/Samsung_LN-R408DX_HDTV_LCD_TV_-whatsinside_text-48.aspx
_________________

[markymark]

thanks vtech.

if the original is Z22AP, 22v glass package diode and you say ok to use a rating of 1 watt.

i do have some 24v 1.3w glass package diodes would it be ok to use these or would i need to use exact voltage ?

thank you

[markymark]

please disregard my last message as thinking about im sure these rating diodes will be fine.

just a few more different components to change which tested shorted and i will check the rail voltage and fire her up.

[vtech]

Yes, as you mentioned, 24v should be fine.

Remember though, if you have "burned" parts on that same line, it is usually indicative that it has lost regulation & shot upward causing the zener to clamp and burn whatever is tied to.
...meaning that if/when you replace them, it is likely that will happen again. Best way to prevent destruction of the new parts is to use a Variac(if you have one) to slowly bring up the main voltage as you monitor the line with a voltmeter.
Again in general, if everything is working, you should see a rise and leveling off below the 22V or else the zener will avalanch.
_________________