WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

[stj]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

can you meter the pins on the back of the tube,
all combinations.

most will show nothing.
what we are looking for is if the gun related to that resistor is shorted to something else - such as the heater!

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

q206 has broken solder joints, the narrow chip needs completely resoldering,
the resistor that fell out needs re-soldering.
by resoldering i mean remove the old solder first.

I went ahead and pulled the Big board out too. If I cant get it, I am going to send the boards out to be repaired. Here are front/back pics if it helps anything

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

q206 has broken solder joints, the narrow chip needs completely resoldering,
the resistor that fell out needs re-soldering.
by resoldering i mean remove the old solder first.

Yes, You are correct about q206, I am aware of the joints at that Transistor/sink. I believe it from recent handling and checking parts for solid mounting. And I know the Resistor needs re-soldering as well, I will make sure to remove the old first. I am afraid the trace on one end of r242 is trying to pull away from the board as well.
I would rather try to figure out the issue before making all the final connections. Wouldn't this be a good idea?

Would having a shorted q201 cause r242 to heat up? thx

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

so q212?

Oh left that out, q212 looked ok as far as I can tell too. About .658 B2E / B2C and open E2B and C2B

[stj]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

q206 has broken solder joints, the narrow chip needs completely resoldering,
the resistor that fell out needs re-soldering.
by resoldering i mean remove the old solder first.

[stj]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

so q212?

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Picture of the bottom side of the board? You should also remove the black stuff and the glue off the board so we can see the Green paint lines on the top side of the board.

Here Are pics of the front and back of the board, I removed the glue and black junk around r242... I have a few transistors unsoldered and a resistors with a leg pulled out...

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

r242, then looking at the schematic,
check d208, q211, q212 for shorts.

also, check the resistance of r215, and r267 in the heater circuit.

r242 is measuring 1.333k, d208 test good, q211 looks good to me, its npn right? E C B is what sheet i found said.

r215 reads 2.5 ohms (i think its marked 2), and r267 reads 1.1 ohm.
Interestingly, i accidently wrote q201 down instead of q211 at first, i tested it pulled and got readings everywhere, looks bad. 201 and 211 are c35502e resistors. I am going to take pics of the board with glue off as Budm requested too... Hope this gives you more insight

[R_J]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

That resistor is for the blue crt drive, even with it out you should get a picture, just missing blue. so I suspect once this fault is found there will be another

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

r242, then looking at the schematic,
check d208, q211, q212 for shorts.

also, check the resistance of r215, and r267 in the heater circuit.

Will check and let you know, thanks!

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Picture of the bottom side of the board? You should also remove the black stuff and the glue off the board so we can see the Green paint lines on that resistor.

ok, budm, will do when i get back from dinner

[stj]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

r242, then looking at the schematic,
check d208, q211, q212 for shorts.

also, check the resistance of r215, and r267 in the heater circuit.

[budm]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Picture of the bottom side of the board? You should also remove the black stuff and the glue off the board so we can see the Green paint lines on the top side of the board.

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

what resistor is it on the pcb, so i can look at the schematics.

It is resistor r242 (on Neck board Black spot in photo)

[stj]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

what resistor is it on the pcb, so i can look at the schematics.

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Update, The resistor I soldered back in desoldered it self and came out again. grrr. Something is definitely making that resistors joints heat up to the point its falling out. Any and all help appreciated.

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Do you have the any of the voltages on P203? +8 volts is for the heaters, if you don't have it, check back to the power supply on D811 and R858

Yes, I have +8.63v dc at 203, also 12.3v, and 69v but still no glow?

[R_J]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Do you have the any of the voltages on P203? +8 volts is for the heaters, if you don't have it, check back to the power supply on D811 and R858

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

Could IC201(video amp) cause the tube to not even glow if it failed?

[proaudiosoft]

Re: WGM2792 Arcade Monitor Resistor Burn Off On Neck Board *Need Help*

check between the transistor leg for shorts, although i suspect you have other problems - the heater is not related to gun-drive.

The Transitor is a c3502e. it appears that it is a npn type from the data sheet i found online. E C B.

I get .682 base to emmiter, and .679 base to collector.

emmiter to base and collector to base shows open. from what I can tell its good.

what should I do from here?