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Power diode ru20jgf blows off

Samsung ctv

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Posted on Aug 22, 2008

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Hi i have a alba tv Model number LCD32880HDF afer 10 seccond the display turn off but the sound no what is the problem???

power supply 17ips10-3 v.1,mainboard 17mb45m-2

the power supply has intergrated inverter bit of a pain,no markings for voltages etc,also used in bush,sylvania etc,it has a touch panel on the side for the usual adjustments ,.

these NORMALLY suffer with the inverter output ceramic caps (3kv),on c231 &c230,an insulation test confirmed they were fine,and capacitance was within tolerance,all other lytic caps tested for esr returned good results.

it had all stable voltages ,but no voltage in inverter section??although a fluctuation on the standby voltage was due to the led's flashing in time with the flucuation.

it was hit and miss knowing what voltage goes where,it is a vestal afterall!things seemed fine as a guestamite.

to do component testing in the area of the inverter, from the smpt there are 2 ultra fast recovery diodes in parallel .

checks on these diodes and look for a shorted diode, (d105) a uf5402...

Mar 28, 2014 | Televison & Video


Magnavox TB100MW9 DTV Converter repair

After a close-by lightning strike, my Magnavox TB100MW9
Digital TV Converter box stopped working. I took it apart and found a
shorted diode (the fat one on the power side of the board)
marked with the number SB340. From the NTE cross-reference
web site, I found a replacement diode, NTE586 (Si, Fast
Switching, Schottky Barrier Diode) that cost me $2.40 at
a local electronic parts store. I replaced the diode and
it works fine!

on Apr 27, 2015 | Magnavox TB100MW9

1 Answer

Green power light just blinks and turns off when trying to turn it on

The problem is a Diode on the corner of the board, location D620, Part #1N4005. To verify this heat the diode up a little with a hair dryer or a soldering iron, ( DO NOT OVER HEAT)! to see if the box will operate and the green light stays on.You can find a replacement at your local Radio shack. REMEMBER TO UNPLUG THE BOX AND WAIT ABOUT 5-10 MINUTES BEFORE YOU ATTEMPT REPAIR TO ALLOW THE CAPACITORS TO DISCHARGE. Pay attention to the cathode band on the diode and make sure it goes back in the same direction. Remember to always be SAFE when working on electronics. If you have soldering skills this should be straightforward for you. If you are unsure about repairing it yourself, ask questions or get a qualified technician to repair it for you. ALWAYS BE SAFE!!!!!!!!!!!!!!!!!!!

Feb 22, 2014 | Magnavox TB100MW9

1 Answer

I have a problem with the power supply board with my TV (Samsung LN46A750). I had a fuse blown and tried to replace it (with a like fuse, of course). Replacing that fuse and attaching the power cord let...

Power supply board have power surge parts,but not totally dead,it just giving to much power some where,that why it keep killing ur fuse.This problems,u must have great electronic skills to track it down.Tries websites like, to buy a refurbish power supply board for the replacement.Power surges are rarely happen,but the surge protector will stop massive power will go the protector when it happen instead all the power will go to the tv itself.

Mar 16, 2011 | Samsung Televison & Video

1 Answer

Onidia ctv no audio volum problm m52771asp

no sound amp ok picher ok ic m 52771asp

May 17, 2010 | Televison & Video

1 Answer

I have a small switching power supply in a cable

check around your diodes near the voltage regulation area for either a very bad diode or a direct short sometimes its near the resistor pack and very hard to see. But if it were me I would just change out the power supply and be done with it.

Sep 09, 2009 | Televison & Video

2 Answers

I have a Spectroniq PLTV-3250 which went completely dead after two years. Am told by the TV repair people that it needs a Power Supply Module. Is there any way you can send one to me in order to repair the...

MODEL: Spectroniq PLTV-3250

SYMPTOM: Totally Dead; no lights, no noises from inside.

SOLUTION: As most folks here know, It is most likely the power supply. After fixing a few of them, all having the same problem, I thought I would share this solution with those who possess electronic repair knowledge.

First, use this solution AT YOUR OWN RISK. DO NOT attempt the repair if you lack the necessary skills or equipment. I am NOT RESPONSIBLE for damage to the TV, to you, or to anything else if you proceed.with this repair. Read this post thoroughly before doing anything so you understand what skills and equipment are required.

Second, this is an ADVANCED repair; the board may be irreparably damaged if care is not taken.

Unplug the set and let it sit for about twenty minutes to let the High Voltage (+169 VDC) drain off. Then remove the back cover. Check again that the set is actually unplugged.

The power supply is on the left. Remove the screws holding the supply and turn it over, laying it on something that will insulate it from the TV chassis (a magazine for example). Check across the largest electrolytic cap (C1) with a multimeter to see if the high voltage is gone. If it is, proceed. If not, short across the large capacitor (C1) to finish draining it.

With a multimeter set on resistance (ohms) or diode test, locate Q7 and check it for a shorted condition. If it is, remove it VERY CAREFULLY. If it is not, STOP. This solution can not help you. It is surface mount, very small, and worse, glued down, so it is difficult to remove

NOTE: I cannot find any tech info on this TV, or a way to decipher the markings on Q7. Apparently, it is some sort of level-detecting switch. But once removed, it can be "strapped" with a diode and the set will suffer no ill effects.

Locate the small electrolytic cap close to pin 4 of the TEA1532A chip (C33). The anode of your diode (1N914 or equivalent) will be soldered to the positive terminal of this cap. Then locate the small electrolytic cap closest to pin 1 of the TEA1532A; the cathode of the diode will be soldered to the positive terminal of this cap (C32). Be careful to mount the diode such that when the power supply is re-installed, it will not touch the chassis or the board. MAJOR damage to the set will result if it does. Check your work to make sure there are no solder bridges or blobs that will cause shorts. Also, it is VERY IMPORTANT that the braided cables be taped well away from the power supply. If that braid touches the metallic parts of the supply, you will either blow the fuse or ruin the power supply. YOU HAVE BEEN WARNED!

Re-install the supply, raise the set to the vertical, check once more that all is well, then plug the set in. If the red light on the front panel is on, start smiling and use the remote to turn the set on.

Good Luck


Jul 11, 2009 | Televison & Video

3 Answers

Sharp TV 21" screen with a switch mode power supply.

i have a tv receiver with a problem of no power going to the whole system thiis transistor c3807 and connected to bigger transistor c4458 are gone together with connecting diodes.any solution please?

Sep 19, 2008 | Televison & Video

1 Answer

Operator manual for Mitsubishi CTV

Mitsubishi's TVs are much better their cars but some have a weird tuning system. Under the cover for AV3 input (lower right front of TV) is a small recessed button marked 'preset'. Push this, then choose 'Auto' to scan and load the channels then choose 'Manual' to adjust and reassign them to the right channels.

Oct 27, 2007 | Televison & Video

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