[TechAssist] Fixed: Philips 27PT6441/37 L04.1U AA Dead-smoked

From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx
Date: Sat, 02 Jul 2005 21:14:37 +0000
The solution was Philips Kit # 483531057673
It contains:
7404   93405413215 SMD FET for horz drive
3239   483511057126  1200 &#937; 1/6 watt
3414   319801224780 4.7 &#937; 2W
5402   242253102617 Horz drive transformer

It also has 2 other variants for 3414 for various models  8.2 &#937; and 12 
&#937; with a note

Peter Oliver
Tucson Radio TV

From: peggs <peggs@xxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Philips 27PT6441/37 L04.1U AA Dead-smoked
Date: Sun, 26 Jun 2005 19:19:41 -0700

from WinStips
1. Losing Horizontal Drive at the H. Drive Transistor.
This unit has a Surface Mount FET it uses as the H. Drive Transistor.
Change 7404 part# 9340 547 13215.
Also 2 resistors need to be changed for reliability of the New FET.
3239 change from 2.7K to a 1.2K
3414 change from 1ohm to 4.7ohm 2 Watt.
3414 is changed to a different Value in other Screen sizes.

2. Seems That The De-Gaussing Circuit Is Drawing More Than The Circuit Was
Designed To Do.
Main 4 Amp Fuse Blows At Turn On, Disconnecting The De Gaussing Coil
Eliminates The Fuse From Blowing And The Set Will Operate Normally.
Part 3523 Which Is A Dual Thermister Assbly Is Bad, Part # 2322-662-96753.
Part Is Already Not Available.
Philips Fix Is To Remove 3523 And Install Thermister Part # 2122-663-00019
In Empty Location 3507.
At This Time That Part Out Of Stock.
The L01 Chassis Uses

3. Clue  If Degaussing Coil Is Unplugged Fuse Blows Will Stop.
Cause  Current Parameters Of Degauss Resistor And Degauss Coil.
Cure  Remove Degauss Resistor 3523 (White Rectangle) And Replace Using
Location 3507 With Service Code 2122 663 00019, A 3 Ohm Ptc Resistor.  Give
Close Attention To The Marking On The Cba For 3507

Peggs

At 03:38 PM 6/25/05, Peter oliver wrote:
 >Philips
 >27PT6441/37
 >L04.1U AA  (marked with PN: 1Q06221)
 >MFD July 2004
 >(Philips flat screen 27" with LG-Philips, Mexico CRT)
 >- HDT at loc#5402 is overheated
 >
 >             Dead Set, customer complined it smelled/smoked and quit. Have
 >found what appears to be the HDT (loc.# 5402) overheated-burned, also it 
is
 >conducting between all 4 pins. A resistor at location 3414 feeding the HDT
 >appears heated but has continuity. HOT, Horz drive Xistors appear ok.
 >Flyback (looks like a funai made transformer) rings well. Tech assist data
 >base says that the manual is avalible in force32 format as PH-7661, would 
be
 >nice to have in PDF as I don't have the Force32 installed. Set must be too
 >new Tritronics doesn't list it (need at least a PN for the transformer-HDT
 >loc# 5402) anyone see one of these yet and have any aditional failure
 >scenerios?
 >
 >
 >Peter Oliver
 >Tucson Radio TV
 >
 >
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[TechAssist] Fixed: Philips 27PT6441/37 L04.1U AA Dead-smoked

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