GE AC-B Chassis (!) - No hor. drive, no start

[Steve Melberg]

Get out yer bell bottoms, this one's an oldie. I'm doing it as a favor
for a friend; it has some sentimental value to him. The Photofact is
1925-1. The set is dead at the hor. oscillator. Has supply voltage
into the chip IC530 (GE P/N EP84X82), but nothing comes out. The chip
comes up missing in my relatively current NTE book, but I found it
listed as ECG852 (nla) in an old book. A rudimentary web search turns
up few references and zero offers to sell this chip. Question one: Am
I barking up the right tree, or am I missing something? Question two:
If so, where might I find one of these puppies?

Thanks,

Steve

C&B Repair

cnb_repair@spamproofingyahoo.com

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[RonKZ650]

I doubt it's a bad chip. Have you resoldered all the feedthrough connections?
90% of all the startup problems were open connections on top of the board under
L970 (located on center right side of board). I worked on hundreds of these
over the years.
Ron

Get out yer bell bottoms, this one's an oldie. I'm doing it as a favor
for a friend; it has some sentimental value to him. The Photofact is
1925-1. The set is dead at the hor. oscillator. Has supply voltage
into the chip IC530 (GE P/N EP84X82), but nothing comes out. The chip
comes up missing in my relatively current NTE book, but I found it
listed as ECG852 (nla) in an old book. A rudimentary web search turns
up few references and zero offers to sell this chip. Question one: Am
I barking up the right tree, or am I missing something? Question two:
If so, where might I find one of these puppies?

Thanks,

Steve

C&B Repair

cnb_repair@spamproofingyahoo.com

Please remove spamproofing before replying by e-mail

 

[Bill Renfro]

Boy that one brings back bad memories!
Yes IC 530 could be bad, but likely it is the feedthrough connections on the
board. It is the horiz countdown timer ic. GE had a service letter on this
problem, and it was related to the feedthrough connections.
I had one of these nasty beasts that just defied repair. Replaced the ic
first set worked for a few days then call back. Called GE got the service
bulletin, resoldered all the feedthroughs, replaced the ic again, set worked
fine for about a week. Called GE again they had me run wires through some
of the feedthroughs, and install some jumpers from the top of the board to
the bottom. Did all that replaced the ic for the third time, set worked
fine for about a week. This time I took the entire set to GE and told them
to fix it. Their solution was to replace the entire circuit board. On the
plus side the customer got an essentially new tv, and they did not charge
for the additional ic's or the main board. Doubt that would happen today.
Heat up the old iron and solder all the feed throughs, before you try to
replace the ic. You might get lucky.
Have fun.
Bill Renfro
Christian Technology
brenfro@charter.net

Get out yer bell bottoms, this one's an oldie. I'm doing it as a favor
for a friend; it has some sentimental value to him. The Photofact is
1925-1. The set is dead at the hor. oscillator. Has supply voltage
into the chip IC530 (GE P/N EP84X82), but nothing comes out. The chip
comes up missing in my relatively current NTE book, but I found it
listed as ECG852 (nla) in an old book. A rudimentary web search turns
up few references and zero offers to sell this chip. Question one: Am
I barking up the right tree, or am I missing something? Question two:
If so, where might I find one of these puppies?

Thanks,

Steve

C&B Repair

cnb_repair@spamproofingyahoo.com

Please remove spamproofing before replying by e-mail

 

[BWL]

When my Dad and I had a repair shop in Jacksonville, FL, we had the contract to
repair the sets in the BOQ at Jax NAS; all 400 of them were GE's. We finally
resorted to hardwiring ALL the feedthrough connections, no more problems...