where can I find a resistor value?

[Aaron Solochek]

In my continuing saga to fix this sun/sony gdm-20d10 I pulled out the D
board to look for capacitors to replace. I noticed a burnt up resistor,
which completely open:

http://www.aberrant.org/~aarons/img_1869_small.jpg
http://www.aberrant.org/~aarons/img_1867_small.jpg
(remove the small for the fullsize image)

The colors are hard to tell in the image, but they appear to be orange
black brown gold, for a 300 ohm. Before I go and replace this, I'd like
to know what the value is really supposed to be, since what looks like
orange might be brown, and what looks like brown, might be purple. If
anyone knows where I can lookup R050 for this monitor, I'd appreciate it.

My other fairly obvious concern is "why did this resistor fry?" There's a
cap (C040, 160V 4.7uF) which is on one of the nodes, so I'll probably
replace that just for good measure. Everything else on the board looks
perfectly fine, so testing this seems difficult.

Thanks.

-Aaron

 

[Impmon]

"Aaron Solochek" <aarons-news@aberrant.org> wrote in message
newsan.2003.12.27.03.08.36.276202@aberrant.org...

In my continuing saga to fix this sun/sony gdm-20d10 I pulled out the D
board to look for capacitors to replace. I noticed a burnt up resistor,
which completely open:

http://www.aberrant.org/~aarons/img_1869_small.jpg
http://www.aberrant.org/~aarons/img_1867_small.jpg
(remove the small for the fullsize image)

The colors are hard to tell in the image, but they appear to be orange
black brown gold, for a 300 ohm. Before I go and replace this, I'd like
to know what the value is really supposed to be, since what looks like
orange might be brown, and what looks like brown, might be purple. If
anyone knows where I can lookup R050 for this monitor, I'd appreciate it.

One thing for sure, they appear to be flameproof resistor. Unfortunately
it's hard to tell the color for sure. It looked brown-black-brown-gold to
me (100 ohms)

 

[John Keiser]

Several years ago I had a possibly similar problem with Sony GDM 20E01.

Sony [Honolulu] kindly gave [free!] me a copy of the schematic for D board.
I checked but the components are not numbered the same as yours so I can't
tell you the exact value of R050. Perhaps your local Sony repair center
will be as helpful as mine was.

My burnt resistor [R 851] was near the flyback.

Cause was a failed ceramic cap [C822] which was hard to find as it was
wedged between other components. Disintegrated when I finally saw it and
wiggled. I also had a blown micro-fuse down the line [which protected
everthing else - they sure don't engineer them this well anymore].

You might check for a bad cap + fuse.

The people on this forum very very helpful in walking me through this
repair.

Good luck.

--
Remove -NOSPAM- to contact me.

 

[Asimov]

"John Keiser" bravely wrote to "All" (27 Dec 03 08:29:40)
--- on the heady topic of "Re: where can I find a resistor value?"

JK> From: "John Keiser" <john.keiser2@verizon.net>

JK> Several years ago I had a possibly similar problem with Sony GDM
JK> 20E01.
JK> Sony [Honolulu] kindly gave [free!] me a copy of the schematic for D
JK> board. I checked but the components are not numbered the same as yours
JK> so I can't tell you the exact value of R050. Perhaps your local Sony
JK> repair center will be as helpful as mine was.

JK> My burnt resistor [R 851] was near the flyback.

JK> Cause was a failed ceramic cap [C822] which was hard to find as it was
JK> wedged between other components. Disintegrated when I finally saw it
JK> and wiggled. I also had a blown micro-fuse down the line [which
JK> protected everthing else - they sure don't engineer them this well
JK> anymore].

I hate to see things wedged like that too. Tight spaces are a problem
for parts that dissipate some heat such as a lossy ceramic might. One
tip that may alleviate the heat problem is to mount the replacement cap
on the trace side of the pcb instead, space allowing of course.


JK> You might check for a bad cap + fuse.

JK> The people on this forum very very helpful in walking me through this
JK> repair.

JK> Good luck.

JK> --
JK> Remove -NOSPAM- to contact me.

.... You may be a tech if you're entertained by a 6-pack and sparking HV.