2001 Sanyo DS27510 -Horozontal Line

[rca2000]

The vertical pump up ckt, is a ckt that recovers what would otherwise be wasted energy from the yoke and adds it to the B+ supply for the ouptut ckt. This is claimed to lower the power needed for vertical deflection and such. Maybe it does. I recall in the old days of SS sets--some vertical ckts had HUGE sinks--probably 30 watts or such for the Vert. outputs, which ran in class A or PP-AB. . In the late '70's or so--they added a "retrace switch" transistor to the ckt, and this made it have a LOT lower dissipation and power draw. The RCA ctc-85 manual give a VERY good explanation of this Pump up" or "retrace boost" ckt. IIRC.

[zeno]

The Sanyo has an RCA jug.
Tell by label style, bonded yoke, EIA # 273
and seeing thousands of them.
Labels tend to be the same with different names only.
Earlier Sanyos used mostly Sylvania EIA 312
Zenith EIA either 343 or 1101 ( Rauland div)
Philco #260
Motorola #185
GE #188
etc.

73 Zeno

[Username1]

Ah... Ok thanks guys ! ! I do remember working on old panasonics with very good sized
heat sinks, and later sets the vertical circuits did seem to have smaller drivers, and
smaller heat sinks... I thought the pump thing was a power supply I had not
seen yet....

Mine had a bonded yoke.... But it de-bonded along with the conv. magnets...
I did not see this set new, so I don't know if it looked really bad while my
sister had it, and for that reason she didn't want it back, or if it
got bounced way out of whack on the ride to my house..... 400 miles...

I'm going to look into the tube on my Sanyo, I still have to pop it open and look into
the vertical on it.... Which now has worked for several days with no twitching
of any kind....

I guess they were getting these circuits better and better just before they quit
making them...

.

[radiotvnut]

Speaking of CRT's in Sanyo TV's, I was once given an LXI branded Sanyo built 20" TV from the late '80's. For the time, it was a nice set with stereo sound and A/V input jacks. The set worked; but, it used a Zenith CRT and unfortunately, the CRT was not in great shape. The emission checked OK; but, during brighter scenes, the picture would go out of focus, the greyscale would change, and there would sometimes be a big blurry band in the middle of the screen. I could run the set with the contrast and brightness turned down; which, helped. However, running it like this produced a dim picture. I eventually sold the set to someone who wanted a cheap TV; but, I think that set would have had an amazing picture, had the CRT been good. Had the CRT been good, I might have kept it.

I also have a mid '80's Sanyo built Sears TV and it's CRT is excellent. I can't remember if the CRT in that set is an RCA or Sylvania (I think it's an RCA).

[ZackN920]

Update: After a week it seems to be doing perfectly fine. No issue's

Originally Posted by Username1

If you feel your picture could be sharper, there should be a focus control on the flyback
transformer

Oh, sure!... after it's all back together... It'l have to wait until it get's moved again.

Originally Posted by rca2000

The "pump up" ckt...has ALWAYS been hard on capacitors. It is one of the first problems to surface on tv sets on the modern SS area--after bad connections. The smaller modern caps get--the more failure-prone the seem to get. I would not worry too much about other ones --yet. I do NOT think Sanyo had a "chronic problem" with electrolytic caps--like its did in their sets.

mmmkay. Who are ya refering to in your last phrase?(like its did in their sets)

Originally Posted by zeno

This repair is a great example of how to fix almost any
vert problem in any set from the mid 80's on. In fact
I only remember a few that wouldnt be fixed by following
the problems pointed out. Thats hundreds of sets......

BTW your set has an RCA CRT the best of that era.

73 Zeno

Honestly, im quite happy as well, that it was this simple of a fix. I was expecting to have to get another chip and mabey do some testing, blablabla..
Hmm, good to hear about the CRT. I didn't know that. I don't remember off hand now, but I don't think I saw anywhere on it, as to who made it. Just the date(6/25/01) and some misc info&safety. I thought it was just of Sanyo's own doing. Honestly for the hour's this set has on it, I'd say it's done good. Don't have a clue how long it will last, but I figure it's got around 46-49500 hour's on it. Only issue's are that when side by side(of another tv) the image is slightly darker (on stock setting's), and it's got what I call "red bleed" with certain color's on the screen. It's most noticeable on "The Simpsons" but it doesn't really show up that much.
As a side note, when it comes to the brightness, I think it's close to perfect and the other tv it was compared to has brightness set higher at the factory. When viewing a wide screen program, if a black image comes up, it's exactly the same as the bars on the top and bottom, while on the (brighter) set, the bars are lighter than the black image and it just looks like it throws the look off some. im ramblin' now

[rca2000]

I meant to write "MITS" as in mitsubishi. Somehow--the "M" got cut off. I am SURE people here--know what I am referring to

[ZackN920]

^Oh... if the M was there I would have probably peiced it together^

[Username1]

I was wondering what its was also... To be honest, there are lots of times I don't
pick up on many people's word trimmings....

But now that you add the M - I do remember a few comments on Mitsubishi
tv sets and capacitor problems....

.