Question about Philips 20PT5441 TV

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Philips no horizontal drive

My philips model # 20pt3732 not starting up no horizontal drive coming from tda 8841.

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Mike, First check out the voltages in the power supply start up circuits. You will need a schematic. good luck.

Posted on Mar 08, 2008

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Hi! i have hitach CRT tv has a problem of switching. the power supply is okay but there is no horizontal signal.I have changed the video amp TDA 8362 but still the same problem.


You need to check if you have horizontal drive to the base of the horizontal out transistor. With a scope check the primary and secondary of the horizontal drive transformer to find out where you are losing the drive.

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IN LG TELIVISION USING TDA 9370PS N3 1774 THE VOLTAGE AT THE COLLECTOR OF H DRIVER TRANSISTER BECOME 0


Disconnect the base of horizontal drive transistor, and now check it collector voltage. If it is found OK; [almost equal to its iput voltage]; check the voltage that comes to its base, from the IC pin. It should be below 0.1 to 0.25V. If found higher than this, the IC is faulty. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts.

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1 Answer

Keeps shutting off shortly after it comes on


This may be needing a horizontal drive kit. Unplug the CRT socket, to see if the TV will stay on. Also, look for discolored surface mount parts in the horizontal drive section that may be causing the problem.

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1 Answer

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it is common fault in LG TV..there will be loose contact
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Check for the cracked solder joints on the IC or dried capacitors on the vertical side

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check the horizontal output transistor or the vertical IC,maybe one of them is defected .

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TDA 8362B IC which have vertical freq.output is at pin no.43. (vert.osc) caution for fixing this problem minimise brightness to avoid crt burn. proceed as follows 1 if you are getting sawtooth at output of ic tda 8362 pin 43 then check 1 supply at vertical output ic from eht. 2 yoke connector loose . 3 check vertical output ic parts. 4 finally vertical ic. please check for normal output from power supply even though fault gets rectified just for protection. good luck.

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