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Forum: Troubleshooting TVs and Video Sources 10-26-2016, 12:40 PM
Replies: 3
Views: 1,658
Posted By hardwareguy
Re: LG 42PA4500 Suspected bad main board (double check my logic)

Just confirming here. I don't do many PDP sets at all.
Forum: Troubleshooting Audio Equipment 10-26-2016, 04:00 AM
Replies: 90
Views: 8,796
Posted By hardwareguy
Re: Should I power this thing up?(I HAVE NO VARIAC)

While I will say prices have gone INSANE with these, the particular unit you have seems to need a tuner alignment very badly. The tuners in these are quite sensitive if they're operating properly.
...
Forum: Troubleshooting Audio Equipment 10-26-2016, 03:53 AM
Replies: 8
Views: 2,680
Posted By hardwareguy
Re: Fosgate Prime R500-1 car amp

Most car amps detect DC offset via the PSU rails.

The theory being that if a rail gets dumped into a speaker, one rail will go low while the other will remain high. If this differential occurs,...
Forum: Troubleshooting TVs and Video Sources 10-26-2016, 03:34 AM
Replies: 3
Views: 1,658
Posted By hardwareguy
Question LG 42PA4500 Suspected bad main board (double check my logic)

I just want a sanity check here...

Got this TV that has funny noises from the Y sustain board, no picture and no sound. Other than a dimly lit black background, it's dead. I don't even get a...
Forum: General Electronics Technical Discussion 11-24-2014, 09:03 PM
Replies: 1
Views: 2,710
Posted By hardwareguy
Re: Dell Inspiron One 2020 Motherboard Build

Get video from the LCD connector. Find out what kind of LCD it had and that will lead you to the interface and very likely, the pinout.
Forum: Troubleshooting TVs and Video Sources 11-24-2014, 06:29 PM
Replies: 7
Views: 2,734
Posted By hardwareguy
Re: Daytek 42DKf3 Volume at 100%

Check for bad caps but it's probably a bad mainboard. See if there is a reset procedure before replacing it though.
Forum: Troubleshooting TVs and Video Sources 11-23-2014, 04:18 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

It appears to be the Vscan rail buffer. Do you have a schematic for this TV?
Forum: Troubleshooting TVs and Video Sources 11-23-2014, 03:23 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

If that shorted then it could have taken out the controller but it's *in theory* protected against such.

The small SMD diodes on the solder side are looking good as well.

I'll probe that IC...
Forum: Troubleshooting TVs and Video Sources 11-23-2014, 02:49 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

No short between source and drain on the SMPS IC, will test for output waveform, controller Vcc and main supply. No other open fusible resistors found.
Forum: Troubleshooting TVs and Video Sources 11-23-2014, 12:38 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

Integrated SMPS and switching MOSFET. I'll dig up the datasheet and see if I can figure things out.
Forum: Troubleshooting TVs and Video Sources 11-22-2014, 11:46 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

I have found an open resistor on the Y main board. R5027 is open, 100k and it appears to be a 1/2W fusible resistor. This resistor is in parallel with C5091, the cap that had visible bulging.
...
Forum: Troubleshooting TVs and Video Sources 11-22-2014, 10:03 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

No appreciable change in voltages were found after this test.
Forum: Troubleshooting TVs and Video Sources 11-21-2014, 07:45 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

Ysch: 0V

Vscan 15V: 800mV

Intuition tells me to hunt for a short.
Forum: Troubleshooting TVs and Video Sources 11-18-2014, 02:37 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

I will be available for more tests Friday night. (may be early morning for you, I'm -6 GMT)

I'm off to my home town for lucrative Apple repairs and to help repair the upstairs bathroom. (It got...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-18-2014, 02:07 PM
Replies: 8
Views: 2,458
Posted By hardwareguy
Re: Teapo made power supplies?!

Indeed and they were good quality. I used to have an old full AT 200W unit...it was a beast inside!
Forum: Troubleshooting TVs and Video Sources 11-18-2014, 01:59 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Re: Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

With the lower ribbon cable from control to Y sustain disconnected I have a 1Hz blink and perfect Vs and Va rails.

With the lower ribbon cable attached: Vs and Va are shut down, light stays on for...
Forum: Troubleshooting TVs and Video Sources 11-17-2014, 08:40 PM
Replies: 19
Views: 6,999
Posted By hardwareguy
Samsung PN60E530A3F...makes startup noise, LED blinks 6 times and then dead.

So this thing, for which I have no service literature whatsoever for just showed up at the door to be looked at.

This customer is a bit of a DIYer so he gave me the Y sustain board to recap. A...
Forum: Troubleshooting TVs and Video Sources 04-30-2014, 06:20 PM
Replies: 19
Views: 8,941
Posted By hardwareguy
Re: Colby 32" TFTV3229 Power failure

Caution! This TV has a recall for a fire hazard.

From the US CPSC: "This recall involves black Coby 32-inch flat screen televisions with model number TFTV3229 and serial numbers beginning with LG...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-29-2014, 09:28 PM
Replies: 5
Views: 6,867
Posted By hardwareguy
Re: Protek 6300 "5 in 1" DMM

I will have to *find* it first! It's in the garage / Storage Facility of Doom (a subsidiary of The Mad Scientist's Lair). Wish me luck.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-22-2013, 01:27 AM
Replies: 5
Views: 6,867
Posted By hardwareguy
Re: Protek 6300 "5 in 1" DMM

Long term test update!

My meter has died due to corroded batteries...I'm not faulting it for it's demise. That's clearly all on Duracell and I.

With that said, I have some gripes. The humidity...
Forum: Troubleshooting Audio Equipment 02-03-2013, 07:34 PM
Replies: 195
Views: 70,673
Posted By hardwareguy
Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

If the chip cap burns on the solder side of the board, CHECK THE AUX SUPPLIES!

In many cases, the output MOSFETs will survive this insult. Use film caps in place of the bipolar electrolytic caps....
Forum: Troubleshooting Audio Equipment 02-03-2013, 07:17 PM
Replies: 2
Views: 2,712
Posted By hardwareguy
Re: RCA RT2770 Receiver

If someone can tell me the voltage that should be across C245 on the DSP board, that would be awesome. I'm seeing 35mV....something tells me I should see more across a 1000uF 6.3V cap. :P
Forum: Troubleshooting Audio Equipment 02-03-2013, 07:15 PM
Replies: 51
Views: 22,684
Posted By hardwareguy
Re: RCA RT2770 Reciever (Home Theater?) Need help!

The 4 large lytics on the amp board are rail stiffening caps. DO NOT replace them with film. The small film caps present on the board are part of the output filtering network.

Mine has no...
Forum: Troubleshooting Audio Equipment 02-03-2013, 03:17 AM
Replies: 2
Views: 2,712
Posted By hardwareguy
RCA RT2770 Receiver

Found an interesting little gizmo, an RCA RT2770 receiver...supposedly "1000 watts". Yeah right....it weighs less than 10 pounds and says 90 watts power consumption. The SMPS is probably 150W or so....
Forum: Troubleshooting Audio Equipment 11-27-2012, 07:01 PM
Replies: 195
Views: 70,673
Posted By hardwareguy
Re: Infinity PS-12 Powered Subwoofer Fired Amplifier

If this amp dies again, make sure the muting and modulator power supplies are up.

The large power resistors feeding the small regs off of the main rails are undersized on a few of these....
Showing results 1 to 25 of 325
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