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Search: Posts Made By: R_J
Forum: Troubleshooting TVs and Video Sources Today, 11:08 AM
Replies: 3
Views: 24
Posted By R_J
Re: LCD TV Green/Pink screen problem

How are you connecting the pc to the tv, hdmi,vga,dvi? is this in a dual monitor configuration? If it is, does the other monitor picture turn pink?
When the tv is showing the problem, bring up the...
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 10:57 AM
Replies: 17
Views: 136
Posted By R_J
Re: mercury pc power supply only 5vsb supply.

When checking voltages on the hot side, use the negative of the large cap or the negative of the bridge rectifier. In this case there are two large caps so you must use the one connected to the...
Forum: Troubleshooting Power Supplies and Power Supply Design Today, 10:17 AM
Replies: 17
Views: 136
Posted By R_J
Re: mercury pc power supply only 5vsb supply.

So you do have +5v vcc on the ic. not 0.5v like in post #7
Check the voltage on the drive transformer (check voltage here). If there is no voltage there, check on boths sides of R23, I suspect it...
Forum: Troubleshooting TVs and Video Sources Yesterday, 09:05 PM
Replies: 3
Views: 24
Posted By R_J
Re: Emerson PL-P42W-10A plasma

Yes you can disconnect the y & z boards, and monitor the voltage on the Vs of the power supply to see if it comes up to 205v.
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:41 PM
Replies: 3
Views: 24
Posted By R_J
Re: Emerson PL-P42W-10A plasma

That will be Vs, there is a sticker on the panel with the correct voltage, It looks like the Vs should be 205Vdc, and the Va 55Vdc
I suspect you have a problem on either the Y-sus or Z-sus boards
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:05 PM
Replies: 3
Views: 41
Posted By R_J
Re: Philips 42 monitor need help on IC

I believe it is a STR-A6069H, The resistor is a 1Ω 5% 1/2watt
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 05:41 PM
Replies: 7
Views: 91
Posted By R_J
Re: Please help fixing this power supply 110vac to 24vdc 5vdc

Just a note but that 1002 is a dual diode, not a mosfet and that blue "varistor" is just a capacitor connected between hot and cold ground.
There is a low ohm (3watt?) resistor between the...
Forum: Troubleshooting Computer Displays Yesterday, 04:55 PM
Replies: 193
Views: 4,715
Posted By R_J
Re: Help with dead Commodore 1802

There is no B+ adjustment, just check if it is close to the 121vdc as indicated on the schematic, if it's off a couple volts either way, thats not an issue.
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 01:33 PM
Replies: 7
Views: 91
Posted By R_J
Re: Please help fixing this power supply 110vac to 24vdc 5vdc

What is the number on U1 ? To get full voltage on the main cap, the triac needs to be turned on, but to do that you need some voltage in the secondary to operate the 5 pin optocoupler. I suspect the...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 12:48 PM
Replies: 17
Views: 136
Posted By R_J
Re: mercury pc power supply only 5vsb supply.

Can YOU trace pin 13 of the ic based on this picture? You have the board, pin 13 needs +5 volts but has 0 volts, This is the best I can do, there seems to be a coil (marked in green) Chck that you...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 11:13 AM
Replies: 17
Views: 136
Posted By R_J
Re: mercury pc power supply only 5vsb supply.

This is not an exact schematic, it is just one that uses the same ic, Your picture is not clear enough to follow the traces in that area.
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 10:27 AM
Replies: 17
Views: 136
Posted By R_J
Re: mercury pc power supply only 5vsb supply.

The ic's vcc likely comes from the 5 volt standby supply, follow the vcc line, there may be a small resistor open. There seems to be two diodes coming from the standby transformer, one will be the...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-21-2020, 10:04 PM
Replies: 42
Views: 5,345
Posted By R_J
Re: Using my CH341A.

Check this site, it has some information: https://hw-server.com/serial-eeprom-programmer
or do a google search for "93c56 programmer"
Also see here http://www.lancos.com/prog.html for ponyprog
Forum: Troubleshooting TVs and Video Sources 02-21-2020, 09:42 PM
Replies: 2
Views: 68
Posted By R_J
Re: Sony 4k TV XE8004 series backlight main board issue

Sounds like a typical BGA problem on the large ic, Did you actually remove and reball the ic? or just heat it up.
Forum: Troubleshooting Power Supplies and Power Supply Design 02-21-2020, 11:37 AM
Replies: 17
Views: 136
Posted By R_J
Re: mercury pc power supply only 5vsb supply.

The green NTC thermistor looks cracked, and is likely close to being open, but it is not likely the only problem because if it was open. you would not have any +5v standby. post what the numbers...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-21-2020, 11:15 AM
Replies: 27
Views: 581
Posted By R_J
Re: Help with car battery charger HT7715

The large 3 watt should read as a short, Try changing the resistance reading to the lowest scale (usually 200Ω) but I guess 0,001k means it is ok. You can also check that small glass diode next to...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-21-2020, 09:48 AM
Replies: 13
Views: 210
Posted By R_J
Re: Troubleshoot swtichmode power supply with DC Bench Power

The large 83f/450v is likely ok and will last a long time, but general purpose will be fine, digikey lists most caps as G.P.
Forum: Troubleshooting TVs and Video Sources 02-21-2020, 09:27 AM
Replies: 17
Views: 193
Posted By R_J
Re: Element ELEFW401A No Power - suspected bad powersupply

That would make it a LD7536R, I suspect it is bad, likely the internal vcc zener is bad. 10Ω is way too low for that pin.
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2020, 10:17 PM
Replies: 7
Views: 91
Posted By R_J
Re: Please help fixing this power supply 110vac to 24vdc 5vdc

What is the voltage ACROSS the 150f/400v capacitor in the primary, It needs to be at least 160vdc, if not check that the fuse is not open, and then check the bridge rectidier.
Forum: Troubleshooting TVs and Video Sources 02-20-2020, 10:09 PM
Replies: 40
Views: 570
Posted By R_J
Re: Vizio E480i-B2 Won't Turn On DPS-167DP IC901

That will work, but It is unlikely the only problem.
Forum: Troubleshooting TVs and Video Sources 02-20-2020, 06:37 PM
Replies: 10
Views: 156
Posted By R_J
Re: Dead NEC E655 - Can't find the service manual

Are you getting any voltage at all across C9105? Also check the resistance of R9101 to see if it is open, it should read 0.24Ω
Forum: Troubleshooting TVs and Video Sources 02-20-2020, 05:54 PM
Replies: 6
Views: 144
Posted By R_J
Re: RCA 55" LED TV Screen Repair Help!!! (Model # RTU5540)

Someone damaged the screen and its RCA's fault? Don't buy any brand because they ALL have fragile screens.
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-20-2020, 05:40 PM
Replies: 18
Views: 987
Posted By R_J
Re: Aerogarden Ultra LED blinking or strobing grow lights repair

Your problem is likely CD1, but there are only 3 caps so just replace all of them.
Forum: Troubleshooting TVs and Video Sources 02-20-2020, 04:58 PM
Replies: 7
Views: 130
Posted By R_J
Re: Finlux 43utd297b-p won't turn on

I would guess the cat pissed on the panel and it damaged the board that connects the panel to the t-con. Try disconnecting the LVDS cable from the t-con board and see if the tv turns on.
What is...
Forum: General Capacitor Questions & Issues 02-20-2020, 04:47 PM
Replies: 11
Views: 344
Posted By R_J
Re: Can i test MLCC caps with multimeter?

All that means is there are other components on the t-con that are in parallel with those caps. this is common.
You ask: "What can be the problem?" maybe tell US what the unit is and the problem you...
Showing results 1 to 25 of 500

 
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