Fried resistor, need value for R801

Hi Dave,

Schematics are tough to come by - but - you may find someone with your model that can help you out in the "Phoenix Gold Phorum" Joining is free - then ask your question and wait for a reply.

Good luck!

http://www.shopjimmy.com/cmo-35-d043264-t-con-board.htm

Clearer picture, same board, r57 can be read upsidedown 220, or 22 ohms.

ZD3 is a 18v zener. Also check the surface mount resistor on the back of the board that is attached to ZD3, I think it is R9. Should be 10 ohms. This resistor sometimes opens when the diode goes short.

Its part of the main board in most cases

There is. It would appear that the DC jack was not the only thing that was fried. If all your solder connections are correct, the mother board may have been damaged be the shorting of some part on the board, and burned open. Look for fuses, and "resistors that are have a "0" on them. they should read a short. if you find nothing. the board is damaged beyond repair.

Sounds like a power surge related problem. My money would be on the Power supply board itself. In cases like these it might be a good idea to replace the entire board itself (costs about 100$) instead of going component by component coz off late the protection circuitry have been getting weaker and as a result a lot of components are getting fried by surges. Last week I have worked on a set with similar problem that had the following fried components blown 10A fuse, 2 Voltage , 2 10KOhm resistors , Regulator ICs, 2 Circuit protectors along with a few capacitors of varying values of capacitance!

I imagine you can look for shorted semiconductor components on the circuit where the hdmi plugs into. It's a bit challenging if you are not familiar with electronic components. You would look for shorted diodes shorted transsistor, open resistors etc. Those components on new electronic device are extremely small and require skills on removal and replacement. They also have values that must be replaced with the same value. Also you can tell visually if they are bad. You would need a multimeter. Taking it to a shop may cost you several hundred dollars.

Dead resistors? The evidence would be if the resistors are cracked OR if their is evidence of smoke/fire around them.

In either case, there would LIKELY be damage at least one or two layers deep beyond those resistors if in fact they are fried. If they are cracked physically, teh circuit board also may be cracked due to physical bending. Tripping over an inpout cable can do this.

Causes of this would be shorting the input to power line voltage or the output of a high powered amplifier.

I question that the resistors are "dead".

THE USUAL cause of failures of these small amplifiers is frying of the output power chip which is often in the TDA family of 5/7 terminal amplifier chips in modified TO220 packages.

Another less common problem is failure of the rectifier and filter capacitor combination.

Your solid green "resistor" is probably a fuse and will have an amp rating stamped on it, if you can read it with a magnifying glass. Before you replace that you need to find out what else on the board or somewhere else in the TV is blowing the fuse. Resistors have bands to denote their value unless it is a large power resistor and the value is written on it.

if you mhave the circut diagram please check it .