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Search: Posts Made By: R_J
Forum: Troubleshooting TVs and Video Sources Today, 06:18 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

They are correct, +10.7 is what they should read. there is very little information on these tv's. Did you check that PRI101 (thermal fuse) is ok. it is just for the pfc circuit.
Forum: Troubleshooting TVs and Video Sources Today, 05:52 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

Have you checked that you have all the voltages on plug CNPPS, when ON
pins 1~3, +5.7v
pin 7, +10V
pin 9, +16V
pin 13~15, +12v
Pins 4,5,6,8,10,11,12 GND
Also that pfc voltage seems low, There...
Forum: Troubleshooting TVs and Video Sources Today, 04:54 PM
Replies: 4
Views: 45
Posted By R_J
Re: Samsung UN65KS9800FXZA Help

When you checked the voltage on th LD fuses, were the backlights on? If not, remove the cable that gave you the backlights in the first post and check again.
Forum: Troubleshooting TVs and Video Sources Today, 02:10 PM
Replies: 7
Views: 76
Posted By R_J
Re: RCA VCR MODEL VMT-400 Problem

The power supply should lift out, there may be one or two screws holding it in place. I guess I was thinking of an older model that used the lamp for the end sensor, this must be new enough to have...
Forum: General Electronics Technical Discussion Today, 01:34 PM
Replies: 3
Views: 37
Posted By R_J
Re: Help with this Item

They look like buttons that will drive air activated switches. when the button is pushed, the air inside connects via an air line to a pneumatic switch. It is usually used for isolation (no wires...
Forum: Troubleshooting TVs and Video Sources Today, 12:55 PM
Replies: 33
Views: 8,048
Posted By R_J
Re: LG 50PJ350 dead, relay clicking

It could be ic703? I don't know which igbt's you replaced because I only have a SJ picture to go by. You likely need to clean the surface of the ic (could be dual transistor) with alcohol to read the...
Forum: Troubleshooting TVs and Video Sources Today, 12:10 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

Are you getting a good PFC voltage? You can check it on PRI501 fuse, It should be around 395 volts
Also check the solder connections on T1501 & T1502
Forum: Troubleshooting Computer Displays Yesterday, 09:51 PM
Replies: 1
Views: 23
Posted By R_J
Re: Partial Success Repairing Vertical White Bands on HP Z30i

The ribbon needs to be reattached with the propper acf tape, but it would be next to impossible to get it aligned without the proper equipment. look at the videos, even with the equipment and...
Forum: Troubleshooting TVs and Video Sources Yesterday, 09:05 PM
Replies: 33
Views: 8,048
Posted By R_J
Re: LG 50PJ350 dead, relay clicking

If the transistors were shorted drain or source to the gate, it is a good chance the gate driver IC is damaged or at a minimum gate resistors. In that case the new transistors are not even being...
Forum: Troubleshooting TVs and Video Sources Yesterday, 08:23 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

Yes you can check it on the bench, You need the lamp across the Vs to ground, Then connect (CN63 pin3 to 6&7), this gives the low voltage, You wil then also need to connect (CN68 pin9 to 2&3) this...
Forum: Troubleshooting TVs and Video Sources Yesterday, 08:08 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

Are you checking the power supply on the bench or in the tv? if it is in the tv, I believe you need to disconnect CN68 for about 5 seconds, then re-connect it
Forum: Troubleshooting TVs and Video Sources Yesterday, 07:44 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

The Vs only has to hit 101v once, then the next time you try it you will get 0 volts.
I will assume that PRI501 fuse is ok, if it is then it is likely the primary side of the Vs circuit is ok and...
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:45 PM
Replies: 7
Views: 76
Posted By R_J
Re: RCA VCR MODEL VMT-400 Problem

Is the tape end sensor lamp, lit? These older vcr's used a small incandescent lamp.

The drum should start spinning as soon as play is pressed and the tape starts to load, if the drum does'nt spin,...
Forum: Troubleshooting TVs and Video Sources Yesterday, 06:11 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

You can test the power supply by itself but you will need a load on the Vs output, you can use a 60watt incandescent lamp as a load and see if the supply stays up.
If the Vs exceeds 101vdc the power...
Forum: General Electronics Technical Discussion Yesterday, 01:21 PM
Replies: 25
Views: 340
Posted By R_J
Re: Need Help Idnetifying a Component

Here is the Datasheet. The "38" is ONLY a datecode, it will be different on the same transistor depending on WHEN it was made.
Here is a picture of the same part made in HONKONG (date code 23)
Forum: Troubleshooting TVs and Video Sources Yesterday, 01:10 PM
Replies: 33
Views: 536
Posted By R_J
Re: Samsung PN58B650S1FXZA Plasma

You did'nt do the test correctly, Pins 3&4 on the control board need to be shorted BEFORE power is applied, not after.
Forum: Troubleshooting TVs and Video Sources Yesterday, 12:39 PM
Replies: 18
Views: 120
Posted By R_J
Re: Hitachi 55HDX99 Plasma Tries to turn on then shuts off

You need to check the voltages on the plugs, not the heatsinks. Check if you have Vs voltage, You need to monitor this pin when the tv is first turned on because if there is a fault the voltage will...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-25-2020, 08:53 PM
Replies: 41
Views: 498
Posted By R_J
Re: Delta DPS-286AP (RDENCA336WJQZ) Troubleshooting

I get parts shipped from digikey for $8.00, and they ususally arrive next day.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-25-2020, 08:43 PM
Replies: 41
Views: 498
Posted By R_J
Re: Delta DPS-286AP (RDENCA336WJQZ) Troubleshooting

Where are you ordering it from?
Forum: Troubleshooting TVs and Video Sources 03-25-2020, 07:41 PM
Replies: 7
Views: 76
Posted By R_J
Re: RCA VCR MODEL VMT-400 Problem

Make sure the loading motor is loading the tape all the way, Those two small belts on the loading motor could be slipping and not loading fully. If the tape does'nt load all the way, it will time out...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-25-2020, 02:50 PM
Replies: 2
Views: 30
Posted By R_J
Re: Liteon PS-6301-08A - Quick question

It is for the -12 volts, should connect to pin 12 of the atx plug
Forum: Troubleshooting TVs and Video Sources 03-25-2020, 11:17 AM
Replies: 9
Views: 191
Posted By R_J
Re: Philips 32PF3320/10 bad colors / too bright

"LCD's top pcb" ?
What "pot" did you adjust? Is there a pot on the board on the lcd panel board? This is the board between the t-con and the lcd panel itself.
Forum: Troubleshooting TVs and Video Sources 03-25-2020, 10:18 AM
Replies: 7
Views: 76
Posted By R_J
Re: RCA VCR MODEL VMT-400 Problem

The first thing to check is the belts, the loading belt could be bad an not loading completely. Provide some pictures of the mechanism. This vcr is over 30 years old
Forum: General Electronics Technical Discussion 03-25-2020, 09:40 AM
Replies: 25
Views: 340
Posted By R_J
Re: Need Help Idnetifying a Component

All the information you need is in the datasheet.
Forum: General Capacitor Questions & Issues 03-24-2020, 10:48 AM
Replies: 3
Views: 75
Posted By R_J
Re: Identify missing capacitor on Voodoo2

It is the same cap as C60 10f/16v, just check google images and you will see it.
Showing results 1 to 25 of 500

 
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