OK, this MX4500/5000/3000 has nothing to do with this MX3500/5500 workshop. It's a complete different design, no parts are compatible. This chassis was manufactured by Thomson, called ICC5, also used by Philips - Telefunken and many other companies. Just to make sure, that this information here does not fit to the MX3500/5500. 😉

But try this:

Powersupply: Replace TP24= BU508A or S2000, check for insulation foil.

CP23 2,2nF 2000V (!!!! probably the reason for this defect...!!!)

CP04 100uf 25V

CP19 47uF 16V

CP24 47uF 100V

CP26 470uF25V

DP23 BY399

DP26 BA157

All parts are under the plastic cover. After that, there should be no blown fuse any more.

But... at least exchange some more of the caps. CP37 4700uF, CP32 1000uF and CP46 2200uF are the next to fail...

Very common on this ICC5 is also: TL31 BU508A or S2000, usually with a defect CL48 12nF1600V or CL44 440nF 250V. If there are vertical lines: RL44=56 and RL42=68 are gone...

Martin

P.S.: who gave you this part list? It does not fit at all to the ICC5 board...

Thank you for ansering Die_Bogener! I didn't found a topic about 4500 so I post here. The parts I wrote before and have replaced are from the mains filter board (picture). Do you know what value is the resistor R6 (mains filter)?

I'll replace the parts (from power supply) you told me after the weekend.

R6 consists of two resistors: PTC 40 + 1000 Ohm 265V. The 40 Ohm is a PTC. Is it burnt?

Martin

Hi,

back to my MX5500.

i measured every voltage, 8V 12V etc on the RGB driver evereything looks good. Ground is ok as well. (Connected to the 2-Pin ground)

I have removed TDA3606, TEA8440 and TEA5640 and all elco's.

When I change R-Y with B-Y then i get a screen with red instead of green, so i suppose, that the videodriver an tube pcb have no problem the 3506 too.

OSD und Teletext are without any error.

On the TA 5640 the R-Y signal has 2.2V, the R-B 3.2V . The datasheet says 3.2 V for both, so this may be a problen, althougth when i change these lines, the scree becomes red. The Xtal is working, i have a clear 62,5hz Signal on Pin 15 on Pin 12 and 17 are the right voltages for Pal/Secam Mode (Vreg, that nearly 8V)

Do you have any suggestion, what to test next. is the error a problem of the Pal/RGB Modul or could it be a problem on the U-Board?

May be video switching or prblem with the sandcastle, the TDA 2579A?

Who should a correct CVBAS Signal look alike? 

Best regards

Ralf

I am repairing a MX5500. It fell onto the floor, but the picture was still right and the set was still working. A couple of weeks later the set showed a white horizontal line in the middle. I suspected  a broken solder joint in or around the vertical deflection area. I found one at D26 (Diode?) and re-soldered it. But it is still giving me this white line. I could not find any other cracks. 

Any ideas or suggestions that I might have overlooked? 

For the diagrams: 

Deflection IC is very prone to cracked joints.

Hi there all,

I have a Beovision MX-5500 and it wil not turn on.

The standby led is on , and when you look at it closer you can see it flashing a little bit.

The tv is not responding to the controller.

I replaced the caps in psu en i cant find any defective components.

Can anybody help me with this or tell me were to start to find the problem?

Have you checked the caps on the NICAM board?

They are often troublesome.

Neil

Yes , and changed a couple of them.

I unsolder r158 on the nicam modul , but still no power up.

On the psu i measured 8 volt on c16 but nothing on c15.

On c11 nothing either.

I measured the 3 optocouplers etc.

On kathode D49 i have 8 volt.

If there's a short in the flyback trafo what should the psu doing?

Have you tried starting it in service mode?