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Equipment Repairs => PLASMA TV forum => Topic started by: wils66 on January 27, 2010,02:42:59

Title: Hitachi 42PD7200A won't power up
Post by: wils66 on January 27, 2010,02:42:59

hello sir, ma'am,
any one know the value of D319 zener diode of the main power supply board?
i did'nt use my plasma tv for more than 6months(with ac unplugged), when i gonna use it it won't power up. just hear the relay click twice and no more( with green led indicator stay lighted).
thanks,
wilson

Title: Re: Hitachi 42PD7200A won't power up
Post by: brian on January 27, 2010,04:27:31

Hello.
Sorry cannot find value D319, corrupt file message when trying to download manual!! But did find this,
No Power appears dead.
Check Surge limiter res. R003 10ohm 5watt on p.supply for o.c.
But before replacing check Q003/004 Mosfets.
Hope this helps,
Bri.

Title: Re: Hitachi 42PD7200A won't power up
Post by: mulja on January 27, 2010,05:09:39

Try disconect drive boards
first disconect bottom board if half screen will light up
then some of chip on drive board shorting you even can see small crack or hole
on one of chip


but in 42pd7200 is the problem drive boards not replaceble
they part of the screen

Title: Re: Hitachi 42PD7200A won't power up
Post by: wils66 on January 27, 2010,20:51:44

hello brian,
i have also download the manual but the problem is the power supply page, very blurr...
so far  the resistor and the mosfet are all ok.
thanks for the reply.

hello mulja,
i'll will try your advise.
thanks for the reply