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Search: Posts Made By: R_J
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals Today, 09:18 AM
Replies: 9
Views: 362
Posted By R_J
Forum: Troubleshooting TVs and Video Sources Yesterday, 09:56 PM
Replies: 20
Views: 591
Posted By R_J
Re: Samsung UN55H6203 - Power Supply BN44-00774A

M1+ is the positive supply for the led string, M5- is the return of the led string, M1- & M2+ are connected together, same goes for M2- & M3+ etc. it is basically one string between M1+ & M5- The...
Forum: General Electronics Technical Discussion Yesterday, 09:37 PM
Replies: 6
Views: 61
Posted By R_J
Re: Help sourcing replacement / alternative chip

It is a mosfet, Alpha & Omega AON7408
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 09:10 PM
Replies: 1
Views: 23
Posted By R_J
Re: Astec AA15990 Schematics

Got any pictures of this power supply? The only astec supplies I worked on were the old open frame ones with the 3 white connectors for the output. They had a protection scr across the +12 volt...
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 05:12 PM
Replies: 39
Views: 5,279
Posted By R_J
Re: Dreambox 500s no power on

If C421 is burning It is either NOT a capacitor (maybe a resistor or inductor?) or it is shorted!
Take C421 out of the receiver and connect the 12v adaptor across it, if it burns it is bad. These...
Forum: General Electronics Technical Discussion 09-23-2020, 10:26 AM
Replies: 14
Views: 224
Posted By R_J
Re: what did i do wrong?

I use this adafruit 1497: Digikey 1528-1524-ND. and sdr-sharp software on a PC, there is also other sdr software that works well.
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 09:44 AM
Replies: 9
Views: 122
Posted By R_J
Re: Samsung HPR5072- No Power- No Standby

With those 3 caps bad it is unlikely you will have any Vs voltsge
Forum: Troubleshooting TVs and Video Sources 09-23-2020, 09:16 AM
Replies: 39
Views: 5,279
Posted By R_J
Re: Dreambox 500s no power on

How can you "BURN" a small ceramic cap with a 12 volt adaptor?
Show a picture of what is Burning
Forum: Troubleshooting TVs and Video Sources 09-22-2020, 09:12 PM
Replies: 9
Views: 122
Posted By R_J
Re: Samsung HPR5072- No Power- No Standby

These look bad (picture is not that clear)
Just so you know, Vs and Va are DC voltages NOT AC
Forum: Troubleshooting Audio Equipment 09-22-2020, 08:41 PM
Replies: 11
Views: 2,967
Posted By R_J
Re: Denon AVR-1609 Power On and Off

If you Google "AVR-1709 service manual" you will find the schematic
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2020, 08:08 PM
Replies: 4
Views: 97
Posted By R_J
Re: Suitable replacement for shorted rectifier

Fep16dt, this is the 200v version, I would use FEP16GT-E3/45 (400v) or FEP16JT-E3/45 (600v)
Forum: Troubleshooting Computer Displays 09-22-2020, 10:49 AM
Replies: 16
Views: 722
Posted By R_J
Re: Samsung Syncmaster 245b BN44-00195A

Replace the ones on the VCC supply, Testers can show that the capacity is ok but in circuit they don't work
Forum: Troubleshooting TVs and Video Sources 09-22-2020, 10:35 AM
Replies: 8
Views: 97
Posted By R_J
Re: Vizio E55-D0 help identifying "smoked" IC on main board

The best picture seems to be from SJ, the ic seems to be a TI ldo, these markings look similar (this ic's pinout is different)
Forum: General Electronics Technical Discussion 09-21-2020, 01:31 PM
Replies: 5
Views: 75
Posted By R_J
Re: Help identify Christmas light wiring

The pcr406 is a 0.8Amp/400v scr, the load in this case will be a number of incandescent lamps whose voltage total the input (220vac) The controller is a 8 sequence controller, and with the addition...
Forum: Troubleshooting Computer Displays 09-20-2020, 10:04 AM
Replies: 16
Views: 722
Posted By R_J
Re: Samsung Syncmaster 245b BN44-00195A

I can't find anything for a mc33670p it must be a mc33067, the vcc seems to be too low for the ic to operate, I meant J816. It could be that the small capacitors for the vcc line are bad (as in open)...
Forum: Troubleshooting TVs and Video Sources 09-18-2020, 08:31 PM
Replies: 39
Views: 5,279
Posted By R_J
Re: Dreambox 500s no power on

There is no reason for C421 to burn, It is just across the 12 volt input, the cap may have been bad, Look at where it is in the schematic, there is no reason for it to burn, in fact you can leave the...
Forum: Troubleshooting TVs and Video Sources 09-16-2020, 02:37 PM
Replies: 39
Views: 5,279
Posted By R_J
Re: Dreambox 500s no power on

c421 can be almost any ceramic cap that looks about the same size, the cap is not that important in the circuit. It can be left out if you like to check the receiver with the original adaptor
Forum: Troubleshooting TVs and Video Sources 09-15-2020, 03:53 PM
Replies: 39
Views: 5,279
Posted By R_J
Re: Dreambox 500s no power on

The adaptor could be bad. What happens to the 12 volts when the receiver turns off?, Yes you can use the 12v 3a adaptor as long as the center pin is positive. The 100f cap will be ok.
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-15-2020, 03:47 PM
Replies: 6
Views: 125
Posted By R_J
Re: Kitchen range hood not turning on

You likely still have a problem with the power supply/control board, maybe you missed a cap? or maybe there is a poor connection making the fault intermittent.
Forum: Troubleshooting TVs and Video Sources 09-15-2020, 10:12 AM
Replies: 6
Views: 128
Posted By R_J
Re: 17ips20-r9 23253538

For U300, check which pin is ground. if pin #1 is ground, it is likely a SG6742HR, If pin #4 is ground it could be a FAN6300
Forum: Troubleshooting TVs and Video Sources 09-15-2020, 09:41 AM
Replies: 39
Views: 5,279
Posted By R_J
Re: Dreambox 500s no power on

C422 can only "BURN" with the wrong polarity
D46 or C421 is shorted! someone supplied the wrong polarity voltage to the dm500. the center pin must be positive. The ferrite bead is NOT THE ISSUE. it...
Forum: Troubleshooting TVs and Video Sources 09-14-2020, 10:55 AM
Replies: 6
Views: 128
Posted By R_J
Re: 17ips20-r9 23253538

What is the value of R129 that IS used on your board? the schematic lists 100Ω. U300 lists FAN6300
Forum: Troubleshooting Computer Displays 09-13-2020, 09:24 PM
Replies: 5
Views: 187
Posted By R_J
Re: Acer AL1916W - Two seconds to black - Voltage regulator problem?

Check that the small blue caps are not shorted. each end of the transformer secondary feeds a lamp. The return side of CN501 goes through R524 to ground, the return sie of CN502 goes through, R521...
Forum: Troubleshooting TVs and Video Sources 09-13-2020, 08:34 PM
Replies: 2
Views: 76
Posted By R_J
Re: M701d-A3 Picture with no backlight

did you have the lcd removed so you could see that EACH led was lit? or did you just observe the backlight was lit with the lcd still in place?
What voltage do you have on the LED-ON pin?
Monitor...
Forum: Troubleshooting Computer Displays 09-13-2020, 08:25 PM
Replies: 5
Views: 187
Posted By R_J
Re: Acer AL1916W - Two seconds to black - Voltage regulator problem?

Your so called S9 is not a regulator, it is the drain of the primary mosfet and will have around 160vDC plus the switching pulse. This is on the primary side so you must use hot ground as a reference...
Showing results 1 to 25 of 500

 
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