panasonic th42pz8b

[daz]

hi all,
fault is led flashing error 10 , psu not running, any ideas? or a service manual would come in handy if any one has one
thanks
daz

[brainstorm]

Hi Daz,

I have had problems with the Th42PZ80:
(worth a look)
10 blinks indicate problem on A PCB LT rails.
These LT lines are all made from FTSB15v rail (from PSU) going from P6 (PIN 7) TO PA5 (PIN 8)
THROUGH FUSE PA5400 ON PA PCB AND OUT FROM PA6 PIN 8 to A PCB (A6).
Check 15VSTBY is getting to A PCB by checking 15v on PA5 and PA6 as above.
A blown PA5400 protector on PA PCB may be the problem.
This can be caused by the metal coated ‘earth’ sponges (located around the metal housing
for the PCBs). These may slip off (when dismantling the unit) and then touch the HC or XS
circuit boards.

Brian

[daz]

hi brian
i have only got the 5v sby working, havnt got 15v sby from psu, main power relay drops out straight away,which i think supplys this voltage.carnt find any shorts or open resistors,perhaps a psu cpu problem?
any ideas no mater how mad always welcome!
thanks
daz

[brainstorm]

Hi Daz,

I think it's the 15v out if the power supply that is the important(from memory)

If you put a meter on the 15v OUT of the power supply and then switch on, does the 15v
come up for a second or two before the protection kicks in?Brian

[daz]

hi brian
no, not even a blip, got a smanual for the for the th42pz85 which looks like it has the same psu, the cpu looks to be shuting the psu down just as main relay pulls in.
pain in arse of a psu to work on, starting to look like a new one
daz

[mulja]

I uploaded service manual

http://www.tv.quuq.org/index.php?ind=downloads&op=entry_view&iden=1243

 

[brainstorm]

Hi Daz

I have sent you a guide which may help you

Brian

[daz]

thanks mulja for the smanual,and that guide you sent brian was very useful, using it I was able to isolate the psu which is defiantly causing the fault, will keep you updated, currently resisting the urge to hit it with a lump hammer
thanks again
daz