SCOTT 772 B+ Boost problem
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SCOTT 772 B+ Boost problem

 
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danyk



Joined: 09 Aug 2006
Posts: 2
Posted: Wed Aug 09, 2006 10:15 pm    Post subject: SCOTT 772 B+ Boost problem Reply with quote
Ticking sound. I found IRFS634A (b+ boost) shorted. I used IRF730. Now the monitor turns on, but the picture is very dark and too high. Seems like EHT is low. What can case this? is IRF730 good replace´ment for IRFS634A ?

Thanks.

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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Sat Aug 12, 2006 5:18 am    Post subject: Reply with quote
what is your mulfanction? where how when?
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danyk



Joined: 09 Aug 2006
Posts: 2
Posted: Sat Aug 12, 2006 12:06 pm    Post subject: Reply with quote
It is SCOTT 772C monitor. Seems to me like EHT is low. I measured B+ on IHVT. It is 96V @ 68,5kHz line scan, 70V @ 43,4kHz. Is it OK or low? If low, what can be wrong?

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neon



Joined: 25 Feb 2006
Posts: 570
Posted: Sun Sep 03, 2006 10:06 am    Post subject: Reply with quote
I think you are describing a driver condition and there should be 3 RGB. some monitors are capable to operate at different frequency if it is dimm then the HV regulator is malfunctioning you should check the HV get 10 mega resistor in series with 1k and measure the IR drop across the 1k.
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