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Equipment Repairs => PLASMA TV forum => Topic started by: Typhoontimmy on October 04, 2009,05:55:37

Title: Hitachi 42PMA400A Plasma
Post by: Typhoontimmy on October 04, 2009,05:55:37

Hi there
I have a Hitachi 42PMA400A Plasma and it has a power up problem. when you turn it on the realy clicks and the light on the front goes from red to green and it displays the picture for a split second and it goes away and about 5 seconds later the light goes back to red and the relay clicks.

People have told me "just replce two Caps in the YSUS board and this will fix the problem but i have replaced a total of 12 Caps in the board already and it's still doing the same thing.

plz help   

Title: Re: Hitachi 42PMA400A Plasma
Post by: PMZ on October 23, 2009,08:34:13

 Hi,
I'm not too familiar with the 400A but an earlier model 350??? :dubbio: (memory not too good) had a similar fault and it turned out to be the 5v standby circuit at fault. Could yours be the same?
Regards,
PMZ.

Title: Re: Hitachi 42PMA400A Plasma
Post by: Typhoontimmy on October 26, 2009,02:02:50

Hey thanks for the reply

with the 5v standby circuit is that on the main power supply

Title: Re: Hitachi 42PMA400A Plasma
Post by: brian on October 26, 2009,12:00:09

Hello,
 Had a different model,type 42PMA500 and not sure if same/similar p.s.
as yours, but check diode D114 for short, and dry joints on IC202. As I say might be worth a look!
  Cheers
Bri.

Title: Re: Hitachi 42PMA400A Plasma
Post by: Typhoontimmy on November 08, 2009,02:26:32

Hey Brian thanks for the reply

With the diode D114 isit on the ysus board.
cheers

Title: Re: Hitachi 42PMA400A Plasma
Post by: Typhoontimmy on November 08, 2009,02:50:01

Also i have and lg 42pxp... and the screen works fine but once it heats up it flickers on and off like there is a dry joint somewhere.  Is this correct or do i have to replace a board to fix the problem. Cheers

Title: Re: Hitachi 42PMA400A Plasma
Post by: brian on November 09, 2009,10:15:20

Hi,
From memory!! the diode D114 is a ERA91-02 type and was on the power supply
It had gone short.
 Cheers
Bri.

Title: Re: Hitachi 42PMA400A Plasma
Post by: astracat on November 12, 2009,17:24:29

hi typhoontimmy
had a similar problem with an hitachi power up ok for few seconds, found relay supply resister had gone high maybe worth a check for your problem
g/luck
astracat