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Hitachi 27GX01B pump-up Capacitor, vertical output

I have a Hitachi 27GX01B bought it new in 2002, I now have all the telltale symptoms of a bad Pump up cap, I can provide schematics, if some body can point out the offending caps number {c????} I am fully aware of the 50Kv in there, and the danger involved, and know what im doing, just not too sure which cap it is. I have the PDF schematics, or they can be downloaded here, "Its in 3 parts" not sure why.

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Re: Hitachi 27GX01B pump-up Capacitor, vertical output

Yes i have fixed alot of tv's with same problem dried out caps by vertical ic.anywhere it gets warm or hot

Posted on Jun 30, 2008

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Re: Hitachi 27GX01B pump-up Capacitor, vertical output

I have the same problem with a Phillips Model: 32PT5441/37
ISo far all I can find on this TV is the pump-up capacitor for the vertical output circuit may be bad but I can't find very much information on this model.
I do high end PC system builds and PC repair but have no expertise in TV repair so any help or a solution to my problem would be appreciated...


Posted on Feb 11, 2008

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The screen display gets smaller towards the centre of the monitor

Sir the problem of your unit is the vertical section of your tv, first try to tap the side of your tv if the tv reacts there is a cold solder in the vertical section specially in the IC if you remove the cover of your unit, but be sure to unplug it first try to observe the solder part of the pcb look for this cold solder or loosed solder.
look for this sign. To fix this you should resolder it using soldering iron, soldering lead, desoldering pump. And also bulging capacitor is the cause of this fault try to look for this capacitor, this bad capacitor is producing a low and unfiltered dc output that causes your unit to malfunction, replace this bad capacitor with the same type and observe polarity.
This is the bulging capacitor, hope this help good day and best regards.

Sep 23, 2011 | Standard (CRT) Televisions

1 Answer

The image on the TV has sort of condensed and disappeared. Now there is a bright line across the middle of the screen and a sliver of (about an inch) of image above that line. The rest of the screen is...

You have a vertical output IC that needs repaired. You may need to only resolder the vertical output IC. If then you do resolder, you will need to check and replace any capacitor in the immediate area of the vertical IC. A weak or bad capacitor will heat up the IC, and create rings on the pins under the IC. Also check the solder grounds on any resistor and diode that are immediately near this IC. This will bring your TV back to full view. Thanks for asking and show a few hands of support!

Oct 04, 2010 | Hitachi 36UX01S 36" TV

1 Answer


Have you vertical deflection circuit checked for bad Vertical IC, and or Bad vertical Capacitors in the vert output section for the deflection board. Also have Vertical output Pump up Capacitor replaced, also have B+ voltage check coming from flyback transformer, for any open fusible resistors

Oct 12, 2009 | JVC AV-20120 TV

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The faint white lines at the top of the screen is the warning that the pump-up capacitor in the vertical output circuit is going bad and the output itself is about to short out. When the TV stops working, the vertical output IC has finally shorted out. Replacing the vertical output IC, the pump-up capacitor and possibly a small value resistor next to the flyback (B+ for the v-out) should bring the set back to life.

Jan 26, 2008 | JVC AV-27230 27" TV

1 Answer

Hitachi 27GX01B

Check c458; (100/16) c454; (220/35) c453; (470/35); c451 (2.2/50) all are electrolytic capacitors located near IC 451 (la7845) If you have an ESR meter it would help out greatly to identify the weak cap or caps.

Nov 22, 2007 | Standard (CRT) Televisions

1 Answer

Toshiba TV

vertical deflection problem. Vertical output IC, pump up cap, power to output problem, bad connections, jungle IC. Its a good idea to replace all electrolytic caps near the output IC. Bad caps cause it to run hot and self destruct.

Oct 29, 2007 | Toshiba CX36F84 TV

3 Answers

Horizontal line in my TV.

"Guest" obviously has no idea what he is talking about. There is no such thing as "frame section" and if the vertical IC, ramp generator or vertical hold circuits were bad, you would have no vertical at all. If you mean that there are thin white lines at the top 3 inches of the picture, and the top of the picture seems folded back on itself, it means that the pump-up capacitor is going bad in the vertical output circuit. This is a very easy thing to correct but should be done by a qualified tech.

Sep 01, 2007 | Standard (CRT) Televisions

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Sony CRT Tv (KV-T29SZ8)

When you see white lines at the top of the screen, it means that the pump-up capacitor next to the vertical output IC is bad and the IC is about to quit. When the output finally quits, you get a black screen with possible dim spots. The vertical output IC and its pump-up cap will have to be replaced, and the little fuse resistors next to the flyback in the + and - supplies to the vertical output IC must be checked too. If you have experience working on TV's then you can do it yourself, but if not then have the set serviced by a tech experienced in Sony sets.

Aug 09, 2007 | Sony KV-35S42 35" TV

1 Answer

Panasonic CT-32D11 TV

Your vertical output IC has stopped working. This is usually caused by the solder joints cracking loose and the IC will either short out inside or just stop working. Sometimes a small capacitor next to the IC, called the pump-up cap, will go bad and cause the IC to fail. In any case, the vertical output IC should be resoldered or replaced and all circuits checked by someone experienced in repairing TV's.

Aug 05, 2007 | Panasonic CT-32D11 32" TV

1 Answer

DS25390 Verticle foldover

If you have a picture but the top is folded over, your vertical IC is probably good and you need to replace the pump-up capacitor next to the IC. When the pump-up cap (typically a 47 or 100uF 35V cap) is open then the picture will have white lines and foldover at the top. The typical vertical output IC is the LA7838, but I am not familiar with exactly which output IC your set uses.

Jul 02, 2007 | Sanyo DS25390 TV

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