Question about RCA F32645 32" TV

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My Samsung cs21a503fl Hout getting over heating (TT2222 and FQH21a004 LOT) Replaced but now horizontal width bit high ?

Dear support, Suggest me what could be the problem

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There are many reasons for this fault. If the transistor is leaky, it will overheat. If the winding have a short [horizontal out section of the deflection yoke], the transistor will overheat. If the base pulse width is abnormal, this might happen. You have to find out the exact reason for this. Contact any service technician. It will be the best. Your set need a through checkup.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/

Posted on May 13, 2014

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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
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Samsung CXM2785TP


it will have a short in the vertical stage or power supply to it, and maybe even a power supply regulation failure(high voltage) that set the whole thing in motion. I will do some research for you and get back real soon :)

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Samsung 21 ultra slim crt ctv smd ic tda 12156h n3 3 changed set ok but exess width no variatin in width in service mode


IC defective. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
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Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

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1 Answer

Screen horizondally pulled right side and screen rolled to left side


hi,
your monitors horizontal deflection side have some problem. you have to check the horizontal width cotrolling transistor mounded on the aluminum heatsik near the lot( line output transistor). also check the three mosfets which adjust the width for different resolutions. there are three such mosfets in the horizontal section.

fist of all replace the width controlling transistor in the heat sink. photo of mosfet and transistor is added for reference. not the exact number.
ok
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Jan 27, 2011 | AcerView 99C 19" CRT Monitor

1 Answer

Dear sir i have samsung 21 inch flat television now horizontal drive transistor fails after few hours i replaced 3 times the same transistor(tt2222) but again geting fails so pls let me know what is...


Hello
You just replace the freewheeling capacitor, normally come up to a value of 5600pf 2000V or so, connected to the collector of the horizontal output transistor, fitted very close to the collector lead. Replace the yoke return capacitor, 0.33uf or so also. Usually samsung sets use no heatsink for the horizontal output transistor. You just put a small heatsink to it and check. If it doesn't overheat, you can remove it later.
You can suspect the deflection yoke also for shorted winding. To check this. pull out the CRT base board out of the neck of the picture tube, place it where it doesn't get short circuited, and unplug the deflection yoke connection from the main board, and switch on the set. See whether the transistor overheats now. If it doesn't overheat, suspect the deflection yoke for shorted turns of winding inside it. Till the transistor overheats, suspect the LOT.
NOTE: Never switch on the set while unpluging the deflection yoke connection plug from the circuit board, without dismandling the CRT base board. CRT may get damaged, with a black burned spot inside the center of the screen.
OK.

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1 Answer

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please check the width section transistor and while it is good condition please check the power diode in width section near to lot and replace the fly back capacitor that range is high volt its situated near to lot.

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1 Answer

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