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Main => Monitor/Video Forum => Topic started by: BlomSwe on June 08, 2009, 09:30:36 am

Title: Repair Toshiba p502sg Rear Projection Display
Post by: BlomSwe on June 08, 2009, 09:30:36 am

Hello.

I've got some convergence trouble with a Toshiba p502sg in a of House of the Dead DX.

One day the convergence went away. I've changed the two large heatsinked convergence circuits.

The green is back to normal convergence, but the Reb + Blue are still way of . . .

Title: Re: Repair Toshiba p502sg Rear Projection Display
Post by: grantspain on June 08, 2009, 10:43:10 am

it may be a faulty new ic or your resistors may be open circuit-i have had both happen
also check the pico fuses on the power supply board

Title: Re: Repair Toshiba p502sg Rear Projection Display
Post by: qrz on June 08, 2009, 09:54:08 pm

when purchasing stk series amp ic's , be careful . there are a number of FAKE STK's being sold by far too many distributors these days :soapbox:

the newer toshiba projos have a digital convergence module ( dcu/hyper module) that is chock full of surface mount 'lytics.  i.e. leaky/high esr , etc.....   
to reduce callbacks , best to replace them all with STANDARD 105 degree 'lytics.

and currently have a 42h83 in shop for just that  ;)


qrz

Title: Re: Repair Toshiba p502sg Rear Projection Display
Post by: BlomSwe on June 10, 2009, 05:29:40 pm

Thanks guys for the fast replies . .

Does any of you have the values/ratings for the following resistors:
(all are located on the convergence board!)

1) R744, R732, R739, R713, R725, R720 (all same = gold/gold/green/yellow?brown?)
2) RH05, RH14 (all same = gold/gold/Black/Yellow?brown?)

Title: Re: Repair Toshiba p502sg Rear Projection Display
Post by: BlomSwe on June 10, 2009, 06:05:19 pm

I figured them out:
1 = 1,5 ohm 5%
2 = 1,0 ohm 5%

I hope that 2 W resitors will be enough?