|22-01-2009||projection tv sony||hi everyone [my 1st post] does any one know if i will need new lamp [tele 5 y.old] picture is now milky with no sharpness and i cant improve it ? just a guide i need before i take it in for repairs, thank you for your time.|
|22-01-2009||Got a model #?|
|22-01-2009||A picture is worth a thousand words.|
|22-01-2009||samsung blows fuse||I have a 13 month old (conviently out of warranty) Samsung TX-T2782 TV that is used exclusively for video games. The other day we turned it on and the screen flashed briefly and then went dark. There is no LED light showing. Removed the rear cover and ohm|
|23-01-2009||INNO HIT IH 3210||diagram electric for tvc lcd 32'' inno hit ih 3210? power board is Vestel 17pw15-6.Tank you|
|23-01-2009||Perhaps if you mentioned what kind of equipment uses an MD-4 or what it is you'd get more replies.
|23-01-2009||PT802S degaussing thermistor #1404-001154|
|23-01-2009||The burn mark is by JW12127 and JW12128 on the main circuit board.
I also just remembered that the sound doesn't work on my TV. I've been using a surround sound receiver and speakers for so long I forgot that the sound in the TV is not working either.
|23-01-2009||hitachi ultravision 50ux23k convergence||Hi,
My set has the blue out of wack. Every now and then it does correct itself for 30 min up to several hours. Magic focus does not do anything to correct. I read on this post [url]http://forum.eserviceinfo.com/viewtopic.php?p=86697[/url] some very hel|
|23-01-2009||IBM LCD Monitor L170 Thinkvision problem||Hi,
Dried up electrolytic capacitors had the Zener diode burn in the power supply of my 6734-AB0 LCD monitor.
Could someone please tell me the value of the Zener ZD904 between L 904 and C924 on the board.
Thank you ! :?:|
|23-01-2009||sony kv-sz29m50 power problem||can somebody help please.It take an hour to turn on.|
|23-01-2009||milky pic||minnie, its a sony 108cm model esn43sn1 ?|
|23-01-2009||ls2500 capacitor-charging high-voltage power supply Kaiser||In our laser we have a LS2500 rev - pn 1100966-24
with the label input 230v 20A, output DC 2 kv 833mA
we have received a spare unit
model LS2500 rev B - pn 1101266p
with the label input 115v 20A, output DC 2 kv 1,5A
The kaiser model LS2500 should|
|23-01-2009||The HV transformer is supplied with 100kHz chopped DC from a +-12 volt supply.
I have since replaced both the 10kV cascade and the HV transformer and the fault is still there. I still hope it isn't the CRT that is faulty because I assume that would mak|
|23-01-2009||Perhaps the trouble could be in any other of the circuits supplied from the HV transformer - either the cathode voltage rectifier D616 with following components or the doublers supplied from the center tap via R636-R637?
Try disconnecting one after ano|
|23-01-2009||Yes, if you only are to use the transformer for repair shop/laboratory work, then it is ok to disconnect the ground bond. But in cases where a such isolation transformer is used to protect, for example, the power supply for a server room from transients, |
|23-01-2009||Reread the thread. Models should be in same Family. IKxx is the "location" of each I.C. (or as you refer to them "slots"). You'll need one IC for each location/slot. Minnie's right, if one is bad, rest are suspect.|
|23-01-2009||Re: ls2500 capacitor-charging high-voltage power supply Kais||Have you tried going to the original source?
Noting that scope "drawing" is 20 years old, have you checked all electrolytics?
When it's acting up, have you tried freezing components, one at a time with freeze spray?|
|23-01-2009||It is no good idea to use freezing spray in such high voltage, high impedance circuits. When freezing, moisture will fall out on the surfaces causing creepage currents and possibly flashover. Of course, on the primary side of the DCDC converter, it would |
|23-01-2009||You are correct about HV area. I was thinking more along the lines of I.C.s, discrete semiconductors, resistors, etc.|
|23-01-2009||The signal on the emitter of the switching transistor T610 when the buzzing sound is heard and the trace becomes dotted is shown below.
Disconnecting the cathode volta|
|23-01-2009||I have checked every electrolytic in the scope with an ESR meter and replaced a couple of suspect ones in the X-Final circuits though I didn't think they were connected to this fault.|
|23-01-2009||Forgot to give X,Y scales on the waveforms above. Top one with fault is X 200uS/div, Y 0.5V/div and lower one without fault is X 10uS/div, Y 0.5V/div. The oscillations that trail off to nothing on the upper pic are the 33kHz chopped DC signal.|
|23-01-2009||Much info in manual, but it will answer questions about voltages and feedback.|
|23-01-2009||Hi there. P83 pin 1 which was purpose to read as +15 volt reads 8.46volt.
Disconnecting L822 restored the +13volt t input to 7805 regulator.
The +15volt rail is loaded down.
Any idea which likely component is pulling it down.
I am working on it.
|23-01-2009||You fool! :lol: You said 15 volts was OK, although you had said it was on a different connector.
The usual: follow the short ... measure resistance on 15 volt foil follow foil until it splits - lift one component, jumper, etc. - measure both sides - fol|