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Author Topic: Wells Gartner WG7487 there is no neck glow / verry hot resistor  (Read 575 times)

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perjmolsen

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I have som problems with my Wells Gartner WG7487 there is no neck glow.

The large resistor (180R 25W) mounted at the upper left side gets very hot after 2-3 sec. (it gets so hot that i easy burn my fingers, then i turn the monitor off)
If i at the resistor where the read lead is mounted it get 150V and the other side at blue lead 15V

If i check the resistor i get 180 ohms reading...

I have changed the following components, but i still get no picture, but a verry hot resistor:

IC4 is changed the orginal where shorted (original where a STR30130, changed to STR3123)
HOT (d1398) is changed it where sorted
Flyback is changed

I have changed the following CAPS

C56 - tested high vloss - changed to 22uf 160V
C57 - tested open - changed to 47 uf 250V
C25 - tested open - changed to 1000uf 35V
C45 - tested ok but changed to 47uf 35v
C46 - tested ok but changed to 470uf 25V
C204 tested ok but changed to 4,7 uf 250V
C40 - tested ok but changed to 2200 uf 35V
C42 - tested ok but changed to 1000uf 35V

Diodes
D19-D21 tests out OK

If i measure volt at resistor R103  I have 151Volt, I have also tried to unsolder D10 but silll no neck glow.
Also tried another C57 Cap (47uf 250V) still same result

What am I missing?
« Last Edit: June 12, 2018, 08:53:29 am by perjmolsen »

perjmolsen

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Re: Wells Gartner WG7487 there is no neck glow / verry hot resistor
« Reply #1 on: June 12, 2018, 04:03:25 am »
Anyone ? :)

perjmolsen

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Re: Wells Gartner WG7487 there is no neck glow / verry hot resistor
« Reply #2 on: June 12, 2018, 04:17:58 pm »
Problem solved!!!  :applaud: :applaud: :applaud:

I have changed IC4 from type STR30130  to STR3123
When thats done, remember to remove the two bridges in front of IC4 called "JB" and "JBB"

When they are removed all volts are fine and chassis works!

grantspain

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Re: Wells Gartner WG7487 there is no neck glow / verry hot resistor
« Reply #3 on: June 13, 2018, 02:11:14 am »
so you changed a 130v regulator ic to a 123v regulator ic?
19" or 29" crt?

perjmolsen

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Re: Wells Gartner WG7487 there is no neck glow / verry hot resistor
« Reply #4 on: June 13, 2018, 02:43:55 am »
Hi

yes it where the only one i could get from my supplier
It is a 25" CRT - do i need to find an STR30130  then?

The only issue right now is that the red color is not so bright as green or blue. I have tried to adjust it but I am unable to get as bright as green and blue.

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Re: Wells Gartner WG7487 there is no neck glow / verry hot resistor
« Reply #5 on: June 15, 2018, 04:23:13 pm »
the b+ will be too low, for 25" it should be 130v hence why you need a str30130 or str3130


the red issue is most likely weak red gun

  
 

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