Question about HP Pavilion MD5020N 50" DLP HDTV

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No standby voltages; primary has 156v on primary cap. md5020 I could not find any open or shorted componets. i need a copy of the power supply shcematic.

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Hi,
Click HERE to download service manual of hp dlp tv, please note that its circuit boards are not suppose to be repaired on component level and have to replace for any problem, service manual has no scehmatics for any board, check Shop Jimmy for any required board.
Hope these info will help you.
Thanks.

Posted on Sep 28, 2010

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Tv shorted out and now doesnt turn on


Vizio model indicated?

general info:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.
6_7_2012_11_46_51_pm.jpg6_7_2012_11_47_04_pm.jpg

Jun 07, 2012 | Vizio E320VL 32 in. HD Ready LCD TV

4 Answers

No power system dead jvc cas 300 audio system


have the unit opened and check for the blow out fuses..

Aug 13, 2008 | JVC Audio Players & Recorders

1 Answer

Rca hdtv comes on and then clicks off. Is that an electrical short of some sort


It can be either a short or a open-----All TV sets have a shutdown circuit of some type---monitors voltages etc and shuts set down to prevent a fire or extensive damage.

Some general information(NOT Knowing the model number):

I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.
5_18_2012_2_44_27_pm.jpg


NOTE: SOME RCA REAR PROJECTION SETS ALSO HAVE A 3 STRIKES RULE BUILT INTO THEM---THEY WILL ATTEMPT 3 TIMES TO COME ON AND THEN SHUTDOWN.

May 17, 2012 | RCA Televison & Video

1 Answer

Won't power on


Hello,

Common problem with this TV is the power supply module.
Check the power supply; look for bad caps with leaking/bulging tops, check to see if you have standby +5vdc at the power supply connector, the front red indicator will not be on if you do not have this +5vdc standby voltage due to shorted out power transistor and zener diode, if other otherwise Power supply board just die.It can be dead at anytime.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

Take care in solving the problem,because it contain high voltage...

Jun 14, 2011 | Televison & Video

1 Answer

Power supply burnt


If the power supply burnt replace the ff. componets

Pico fuse, Bridge type diode and check all shorted and open componets of primary power supply before turn it on.

Sep 20, 2010 | Samsung SyncMaster 920NW Monitor

2 Answers

What is airbag light code 31 and 51 on a 1994 ford taurus


I was unable to locate code 31 in my book here is a copy of the codes. looks like you just need a fuse for #51. this may fix 31 as well.

Diagnostic Trouble Code Table 1994

AIR BAG DIAGNOSTIC MONITOR DIAGNOSTIC TROUBLE CODE PRIORITY TABLE
Priority Code Component/Fault Description
Highest - No Air Bag Indicator - Inoperative Lamp Circuit or No Ignition
Voltage to Air Bag Diagnostic Monitor

Continuous Air Bag Indicator - Air Bag Diagnostic Monitor
Disconnected or Inoperative
12 Low Battery Voltage
13 Air Bag Circuit Shorted to Ground
14 Primary Crash Sensor Circuit Shorted to Ground
21 Safing Sensor Not Mounted to Vehicle Properly
22 Safing Sensor Output Shorted to Battery Voltage
23 Safing Sensor Circuit Input Feed/Return Circuit Open
24 Safing Sensor Output Feed/Return Circuit Open
32 Driver Side Air Bag Module High Resistance or Open
33 Passenger Side Air Bag Module High Resistance or Open
34 Driver Side Air Bag Module Circuit Low Resistance or Shorted
35 Passenger Side Air Bag Module Low Resistance or Shorted
42 Center Radiator Primary Crash Sensor Feed/Return Open
44 Center Cowl Primary Crash Sensor Not Mounted to Vehicle Properly
45 Center Radiator Primary Crash Sensor Not Mounted to Vehicle Properly
51 Diagnostic Monitor Internal Thermal Fuse - Fuse Blown Due to
Intermittent Short to Ground
52 Backup Power Supply - Voltage Boost Fault
53 Primary Crash Sensor Circuits - Resistance to Ground or Air Bag
Diagnostic Monitor Failure

Lowest - Rapid Continuous Flashing of Air Bag Indicator (No DTC) All Primary

Sep 30, 2009 | 1994 Ford Taurus

2 Answers

No power


Is the fuse located before or after the main power switch?

If the answer is before the main switch, then maybe you should also check the main power switch (dirty contacts - these may cause insufficent voltages from the power supply).

Note that the (electrolytic) capacitors can be faulty but will not have visible damage, so check the DC voltages on the power supply output and try to replace the associated capacitors if the voltages seem to be too low (usually, there will be 12 and 5 volts outputs, sometimes a 3 volt output on some brands/models).

If it turns out that these voltages are not present at all, then there may be damage to the transformer driver IC (i'm assuming this is a switching power suply) - see if there is any AC voltage present at the secondary terminals of the transformer, if there is none, then the primary is most likely not being driven by the 110 V and this points to the driver IC as the possible cause. It may also be some other component in the primary section, but you said you've checked them out, so i don't know what else to suggest.

Hope you can fix it.

regards

Triarcuate

Sep 29, 2009 | RCA DRC220N DVD Player

1 Answer

Digital Stream HD 3150 OTA HDTV tuner does not operate


Disclaimer: The answer provided is entended for you to have some basic electronic knowledge and soldering skills.

Troubleshooting switching power supplies just sucks, but there are ways of finding the fautly componets. In my case, a visual inspection found 2 bad capitors, the tops bulging open and oosing goo. If you look at the tops of any other caps they should be flat. You can also note faulty caps by discoloration of the circiut board itself. I had one other faulty cap on my supply that, by visual inspection had been running hot. After replacing the defective caps (Nichicon 105c) I went with an ohm meter, and checked the smaller transistors for faults. Q1 a very common transistor was bad (2N3906) with a base emitter short. In conclusion, it's the cheap caps that are at fault, sometimes taking the silicon with them as they short out. The unit is now working.
As an added note, I understand that there is a Radio Shack branded version of the HD3150 as well.

Jan 05, 2009 | Pbi HD3150 DTV Receiver

3 Answers

TV won't turn on


Shorted problem. Maybe in primary or secondary power supply. Need a repairman. Busted regulator, or shorted diode.

Apr 17, 2008 | Samsung SlimFit TX-T2782 HDTV

1 Answer

NO POWER/POWER FAILURE


I'd assume this machine uses an ATX design power supply. ATX and other late designs (after the days of the AT style units) have a standby voltage supply which powers just a small portion of the motherboard circuitry (voltage= +5 volts). Your problem is likely caused by one or more electrolytics in this standby section. If you open the supply, you should see at least 2 switching transformers, likely sitting close to each other. One will be large (for the main/full power) and a small one (for the standby section). Usually the bad capacitor is on the primary side (on the side where the switching transistor is). It may be a 10MFD/50Volt or 47MFD/25Volt, or some value close. If the bad cap is on the secondary side (the section which is connected to your motherboard), then the value will be something like a 1000MFD/10Volt or 16Volt, or 1500MFD, 2200MFD. This capacitor will be physically larger than the one noted for the primary side. I can't tell you the exact location on the board where these capacitors might be, except they will be close to the small transformer mentioned above. If you have a digital camera, and could take a pic or 2, I might be able to point to the exact suspect part. You could send pic to dodgecharger4404@netscape.net. Of course, you need a solder iron/solder, and a little skill...

Jun 27, 2007 | Compaq (243890-001) 250-Watt Power Supply

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