Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old April 15th 06, 07:29 PM posted to sci.electronics.repair
Brad
 
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Default Intermittent Fuse Blow When Philips TV is Plugged Into AC

Hi,

Philips TV model 27PT5441/37 ch L04.1UAA mfg 08/04

In my shop, this TV will blow the main fuse intermittently when the TV is
plugged in (when the AC cord is plugged into an outlet) . NOTE: I don't
have a SM. Most times, when the TV is plugged in, the fuse doesn't blow, and
the TV can be turned on and everything is "fine". Note: I had replaced the
fuse with a 4A slow blow type. I checked the degaussing coil thermistor cold
resistance which measures 6.6 ohms.

Was this a common problem with this model TV? Was there a
"fix" or modification to fix this problem?

Thanks in advance, Brad

Before you type your password, credit card number, etc.,
be sure there is no active key logger (spyware) in your PC.


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Old April 15th 06, 09:13 PM posted to sci.electronics.repair
John-Del
 
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Default Intermittent Fuse Blow When Philips TV is Plugged Into AC

The degauss thermistor is probably bad. Also make sure the fuse is a
"T" type (time delay)

John

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Old April 15th 06, 10:52 PM posted to sci.electronics.repair
Jamie
 
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Default Intermittent Fuse Blow When Philips TV is Plugged Into AC

Brad wrote:

Hi,

Philips TV model 27PT5441/37 ch L04.1UAA mfg 08/04

In my shop, this TV will blow the main fuse intermittently when the TV is
plugged in (when the AC cord is plugged into an outlet) . NOTE: I don't
have a SM. Most times, when the TV is plugged in, the fuse doesn't blow, and
the TV can be turned on and everything is "fine". Note: I had replaced the
fuse with a 4A slow blow type. I checked the degaussing coil thermistor cold
resistance which measures 6.6 ohms.

Was this a common problem with this model TV? Was there a
"fix" or modification to fix this problem?

Thanks in advance, Brad

Before you type your password, credit card number, etc.,
be sure there is no active key logger (spyware) in your PC.

mite want to check for leaking Electrolytic caps and or PS diodes in
that same area.


--
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

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Old April 16th 06, 12:15 AM posted to sci.electronics.repair
b
 
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Default Intermittent Fuse Blow When Philips TV is Plugged Into AC


Brad wrote:
Hi,

Philips TV model 27PT5441/37 ch L04.1UAA mfg 08/04

In my shop, this TV will blow the main fuse intermittently when the TV is
plugged in (when the AC cord is plugged into an outlet) . NOTE: I don't
have a SM. Most times, when the TV is plugged in, the fuse doesn't blow, and
the TV can be turned on and everything is "fine". Note: I had replaced the
fuse with a 4A slow blow type. I checked the degaussing coil thermistor cold
resistance which measures 6.6 ohms.

Was this a common problem with this model TV? Was there a
"fix" or modification to fix this problem?

Thanks in advance, Brad


is the fuse open or blackened?
Getting a useful answer to your problem depends on this information!.

anyway, try desoldering and removing the degauss posistor and
disconnect/ reconnect the set a few times to test.So far, that is what
I'd put my money on as the culprit.
there is clearly some problem very near the mains inlet point, so
suspect anything connected across the line - AC filters, degauss coil,
possibly rectifier diodes and capacitors across them, etc.
-b.

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Old April 17th 06, 12:19 PM posted to sci.electronics.repair
Jason D.
 
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Default Intermittent Fuse Blow When Philips TV is Plugged Into AC

On Sat, 15 Apr 2006 20:15:04 -0700, Andy Cuffe
wrote:

On Sat, 15 Apr 2006 17:29:27 GMT, (Brad) wrote:

Hi,

Philips TV model 27PT5441/37 ch L04.1UAA mfg 08/04

In my shop, this TV will blow the main fuse intermittently when the TV is
plugged in (when the AC cord is plugged into an outlet) . NOTE: I don't
have a SM. Most times, when the TV is plugged in, the fuse doesn't blow, and
the TV can be turned on and everything is "fine". Note: I had replaced the
fuse with a 4A slow blow type. I checked the degaussing coil thermistor cold
resistance which measures 6.6 ohms.

Was this a common problem with this model TV? Was there a
"fix" or modification to fix this problem?


I have seen a LOT of recent Philips TVs with bad degaussing
thermistors. Eventually, they blow the fuse every time.
Andy Cuffe



Yes, this chassis needs many modifications.

1. Pull out the deguassing resistor (white round plastic) 3 leg,
install any 2 pin deguassing that is designed for 4A fuse, I used
either philip's blue ones or RCA termistors that was used in same
modification as well (for ITC008 series).

2. Snip out 2 carbon resistors (both same value, and are in series)
side to side by the flyback, install jumper in it's place.

3. Install modification kit (have to look up part number for this), to
prevent horizontal driver circuit frying. Envidenced by blackened
horizontal driver transformer. Only about 6 dollars per kit.


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